Supply Installation Testing and Commissioning of 100KW On-Grid Roof Top Solar System at HAL, Barrackpore.

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DECLARATION II

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It is an express condition that the tenderers are advised to visit the site before qouting to ascertain the scope of work involved.A pre-bid meeting is scheduled (refer Tender Notice for venue,Date and Time) .No extra claims will be entertained later.

Design Supply Installation Testing and Commissioning of 100KWp On Grid Roof Top Solar PV Plant with all accessories connected to the existing network including netmetering /Zero Export Device as per applicable State regulations at the time of installation .Scope of work includes certified design of entire plant and structures from recognized Lab/institutions in this regard and obtaining statutory approvals from regulatory authorities for installation,commissiong and operation of the plant.

Operation and Maintenance contract shall commence after successful completion and handing over of the opeartional plant (including all approvals/certificates and clearances from regulatory authorities ) to HAL Barrackpore.

The work has to be carried out in Co-ordination with Engineer In-Charge(EIC)for minimum power interuptions and shutdowns if any required shall be intimated to EIC in advance in writing for smooth coordination work.Also preparation work if any required has to be carried out as directed by EIC without any additional cost during execution.

Successful agency has to prepare the shop drawings as per actual site conditions and same to be submitted to HAL for approval before taking up work as and when called by EIC.

Basic rate to be quoted for each item.Subject work is called on works contract basis and prevailing GST as applicable for each item to be mentioned in the coloumn for GST .Tenderers must abide by the prevailing GST rules.

L1 will be determined including GST.

The Tenderer shall be deemed to have examined the Tender documents-PART A for Instruction to tenderers,General Condition of Contract,Special Conditions of Contract,Safety requirements,List of Approved make of Materials and Equipments before quoting .

Compliance of the Technical compliance matrix is mandatory for validity of the price bid qoute.

Work has to be completed as per latest guidelines and specification of MNRE/CPWD/IS/IEC as applicable for Solar Installations .

Description

Supply of materials for total 100KWp(on Two Buildings of 50KW each) On Grid Roof Top Solar PV Plant at HAL Barrackpore.

Installation Testing & Commissioning of above total 100KWp Solar Plant .

Laisioning with regulatory authority such as CEIG/CESC for Net metering/Zero Export (as per state regulations ) or any other statutory approvals with all statutory fees.The scope includes obtaining plant approval before installation,completion certificate and commissioning permission etc.If inspectorate approval is required for the proposed solar power plant as per state electricity code/rules,same has also to be obtained without any extra claims.

Opertaion, Maintenance and service including 05 years comprehensive maintenance of 100 KW Solar Plant .

HAL/BKP/ELECT/SOLAR/2024/567

Supply, Installation, Commissioning and Testing of 100 KWp Roof Top On Grid Solar Power plant ncluding comprehensive maintenance for a period of five years in HAL Barrackpore

VENDOR REPLY (COMPLIED/ NOT COMPLIED)

INTRODUCTION

COMPLIED

LOCATION

SYSTEM DESCRIPTION AND TECHNICAL SPECIFICATIONS

Solar PV Panels Mono Crystalline Si PERC IEC certified, 545Wp as per MNRE's updated ALMM list dated 14-10-2024.

Grid interactive Power Conditioning Unit of 3 Ph. 50KW x 2 capacity each.

Mounting structures Fixed tilt RCC roof mounted panel structures. Hot Dip Galvanized. Tilt angle adjusted to site Latitude.

Junction Boxes, IR/UV protected PVC Cables, pipes and accessories

TUV certified Interconnecting PV cables.

DC DB and surge protection devices, MC 4 Connectors and String Inverter with remote monitoring,

Suitable DC cabling to String Inverter,

AC cable for interconnection to the existing MCC

Feeder of AC PVC armoured cable from string Inverter to the HAL Distribution Board feeder, AC D.B. with Multi-function meter, AC Isolator, CTs. & Generation meter Terminal blocks bus bar etc.

Earthing (chemical compound type) for AC DC circuits and Lightning arrestor separately. With GI strips

Canopy/ shed for Inverter to protect from direct sunlight and falling water.

SOLAR PHOTOVOLTIC MODULES

The PV modules used must adhere to the latest edition of IEC PV module qualification test or equivalent BIS standards (Crystalline Silicon Solar Cell Modules IEC 61215 /IS14286. In addition, the modules must conform to IEC to IEC 61730 Part -1- requirements for construction & Part 2 -requirements for testing, for safety qualification or equivalent IS

The total solar PV array capacity should not be less than 100 KWp under STC and should comprise of PV modules of 545Wp (under STC) and above wattage with 144 or more half cut cell configurations.

Protective devices against surges at the PV module shall be provided. Low voltage drop bypass diodes shall be provided.

PV modules must be tested and approved by one of the IEC authorized test centres. Type test certificates should be submitted.

The module frame shall be made corrosion resistant materials, preferably with anodized aluminium.

The bidder shall carefully design & accommodate requisite numbers of the module as at SL.NO.3 above to achieve the rated power in his bid. HAL shall allow only minor changes at the time of execution.

Other general requirement for the PV modules and subsystems shall be the following:

The rated output power of any supplied module shall have positive tolerance of 0 to 3% and negative temperature co-efficient of power for the modules shall be less than or equal to 0.45% per deg C.

The peak-power point voltage and the peak-power point current of any supplied module and/or any module string (series connected modules) shall not vary by more than 2(two) per cent from the respective arithmetic means for all modules and/or for all module strings, as the case may be.

The module shall be provided with a junction box with either provision of external screw terminal connection or sealed type and with arrangement for provision of by-pass diode. The box shall have hinged, weather proof lid with captive screws and cable gland entry points or may be sealed type and IP-65 rated.

I-V curves at STC should be provided by contractor.

Modules deployed must use a RF identification tag. The following information must be mentioned in the RFID used on each module (This can be inside or outside the laminate, but must be able to withstand harsh environmental conditions.): -

Name of the manufacturer of the PV module

Name of the manufacturer of Solar Cells.

Month & year of the manufacture (separate for solar cells and modules)

Country of origin (separately for solar cells and module). Indigenous modules to be supplied.

I-V curve for the module Wattage, Im, Vm and FF for the module

Unique serial No and Model No of the module.

Date and year of obtaining IEC PV module qualification certificate.

Name of the test lab issuing IEC certificate.

Other relevant information on traceability of solar cells and module

Warranties and Guarantees

Material Warranty

Solar Modules: workmanship/product replacement -10 years

Solar Modules: 90% power output at the end of 10 years and 80% power output at the end of 25 years.

Inverter: Workmanship/product replacement -5 Years, service -25 years

BoS: parts and workmanship -5 years, service -25 years

Power plant Installation: Workmanship -5 years, service-25 years

PV Array Installation: Structural 25- years

Performance Warranty (to be tested after installation):

Power performance ratio: The overall power performance ratio of the system shall exceed 70% measured at inverter output. (Sum total of the system power losses shall not exceed 30%) For the global solar radiation in the plane of Array (POA) of 1000 w/m2, a 10kwp PV power plant AC output shall be minimum of 7kW at any time during the day. Correction shall be applied based on available solar radiation. For example, for 800 W/m2 radition,10kWp PV power plant shall produce min of 5.60kW ac output (7x0.8)

Energy performance Ratio: The overall energy performance ratio of the system shall exceed 75% measured at inverter output. (Sum total of the system energy losses shall not exceed 25%). For Global solar insolation in the plane of Array (POA) of 5 kWh/m2 (5peak sun Hours) for the day, a 10Kwp PV power plant AC energy output shall be minimum of 37.5 kWh (7.5kWx5hrs) for the day.

ARRAY STRUCTURE

Hot dip galvanized MS Mounting Structures should be used for mounting the modules/ Panels/arrays. Each structure should have angle of inclination as per the site conditions to take maximum insolation which is normally equal to the latitude of the location. However, to Accommodate more capacity the angle inclination may be varied until the plant meets the specified performance ratio requirements.

The Mounting structure shall be so designed to withstand the wind speed 150 Km/hr. The design Should be certified by a recognized Lab/ Institution in this regard and wind loading calculation sheet should be submitted to HAL.Suitable fastening arrangement such as grouting and clamping should be provided to secure the installation against teh specific wind speeds

Structure material shall be corrosion resistant and electrolytically compatible with the materials used in the module frame, its fasteners, and nuts and bolts. Aluminium structures also can be used which can withstand the wind speed. Necessary Protection towards rusting need to be provided either by coating or anodizing.

The Fasteners used should be made up of stainless steel. The structures shall be designed to allow easy replacement of any module. The array structure shall be so designed that it will occupy minimum space without sacrificing the output from the SPV Panels.

Regarding Civil Structure the bidder need to take care of the load bearing capacity of the roof and need to arrange suitable structure based on the quality of roof. The grid structure shall be installed in such a way that the load is Accordingly without any impact on the waterproofing of the roof. Additional water Proof, if necessary, should be provided in the areas where the support are mounted.

The minimum clearance between the lower edge of PV panel and FFL of roof shall be 600 mm.

The PV modules should be secured onto the structure using screw fasteners/ metal Clamps. The holes Provided by module Manufacture shall only be used and no additional drilling on the module will be allowed.

JUNCTION BOXES (JBs)

The Junction boxes are to be provided in the PV array for termination of connecting cables. The JBs shall be made of GRP/FRP/ Powder Coated Aluminum/ cast aluminum alloy with full dust, water & vermin proof arrangement. All wires/cables must be terminated through cable lugs. The JBs shall be such that input & output termination can be made through suitable cable glands.

Copper bus bars/terminal blocks should be housed in the junction box with suitable termination threads conformation to IP65 standard and IEC 62208.Hinged door with EPDM rubber gasket to prevent water entry should be provided with provision of earthling. It should be placed at 5 feet height or above for ease of accessibility.

Each junction Box shall have high quality suitable capacity MOV type-II surge protection devices, suitable Reverse Blocking Diodes. The junction Boxes shall have suitable arrangement for monitoring and disconnection of each of the groups.

Suitable markings shall be provided on the bus bar for easy identification and the cable ferrules must be fitted at the cable termination points for identification.

PCU/INVERTER

As SPV array produces direct current electricity, it is necessary to convert this direct current into alternating current and adjust the voltage levels to match the grid voltage. Conversion shall be achieved using an electronic inverter and the associated control; and protection devices. All these components of the system are termed the "Power Conditioning Unit (PCU)". In addition, the PCU shall also house MPPT (Maximum Power Point Tracker). Inverter output should be compatible with the grid frequency. Typical technical details of the inverter shall be as follows:

Switching Devices: IGBT/ MOSFET

Control: Microprocessor / DSP

Nominal AC output Voltage and Frequency: 415V , 3 Phase, 50 Hz

Output Frequency :50 Hz

Grid Frequency Synchronization range: +/- 3Hz

Ambient Temperature Considered: -10 C to 60 C

Humidity: 95% Non - condensing

Protection of Enclosure: IP -65 (Minimum) for outdoor.

Grid Frequency Tolerance range: +/- 3 Hz

Grid Voltage Tolerance range: -0.2 to 0.15

No- load losses: Less than 1 % of rated power

Inverter efficiency (minimum) :> 97%

Three phase PCU/inverter shall be used with the power plant system. Multiple inverters in string formation can be used, if required. The combined wattage of all inverters should not be less than rated capacity of power plant under STC.MPPT shall be integrated in the PCU/Inverter to maximize energy drawn from the array.

PCU/ inverter shall be capable of complete automatic Operation including wake -up, Synchronization(phase Lock) & shutdown.

The output power factor of PCU/inverter should be of suitable range to supply or sink reactive power. Inverter should have internal protection arrangement against any sustainable fault in feeder line and against the lightning on feeder.

Built-in meter and data logger to monitor plant performance through external computer shall be provided.

Anti-islanding (Protection against Islanding of grid): The PCU shall have anti islanding protection in conformity to IEEE 1547/ UL 1741/ IEC 62116 or equivalent BIS standard.

Successful bidder shall be responsible for limiting DC injection into the grid and load as per the CEA/ State regulations.

The PCU/ inverter generated harmonics, flicker, DC injection limits, Voltgae Range, Frequency Range and Anti-islanding measures at the point of connection to the utility services should the latest CEA (Technical Standards for Connectivity Distribution Generation resources) Guiledlines.

The PCU/inverter shall provide display of PV array DC voltage, current and power, AC output voltage and current (All 3 phases and lines, AC power (Active, reactive and apparent), Power factor and AC energy (all 3 Phases and cumulative) and frequency. Remote monitoring of inverter parameters should be possible. Internet connectivity, if required, shall be arranged by HAL. The connecting cable is in the scope of vendor.

The power conditioning units/inverters should comply with IEC 61683/IS 61683 for efficiency measurements and IEC 60068-2(1, 2, 14, 30)/ Equivalent BIS Std for environmental tests as per standard codes. The Junction boxes/enclosures should be IP 65 (for outdoor) as per IEC 529 Specifications.

The PCU/ inverters should be tested from the MNRE approved test centers / NABL / BIS / IEC accredited testing- calibration Laboratories. In case of imported power conditioning units, these approved by international test houses.

EVACUATION SCHEME OF SOLAR POWER

AC DISTRIBUTION PANEL BOARD

AC Distribution Panel Board (ACDPB) shall control the AC power from PCU/ inverter, and should have necessary surge arrestors. The ACDPB should be interconnected to the Main LT Bus bar while in grid tied mode.

All switches, circuit breakers (MCCBs & MCBS), connectors, the changeover switches/isolators, cabling work etc. Should be undertaken by the bidder as part of the project.

The ACDPB should outdoor type, metal clad, totally enclosed, rigid, floor mounted, air - insulated, cubical type suitable for operation on three phase 415v, 50 with 4 pole MCCB and surge protection device.

The ACDPB shall be designed for minimum expected ambient conditions of Kolkata

The ACDPB should Conform to Indian Electricity Act rules (till last amendment).

All the 415 AC or 230 volts devices / equipment like bus support insulators, circuit breakers, VTs etc. Mounted inside the switchgear shall be suitable for continuous operation and satisfactory performance under the following supply conditions: Variation in supply voltage +/- 10% Variation in supply frequency +/- 3 Hz

PROTECTIONS

SURGE PROTECTION: -

LIGHTNING PROTECTION: -

The SPV power plant shall be provided with lightning & overvoltage protection. The main aim is this protection shall to reduce the over voltage to a tolerable value before it reaches the PV or other sub system components. The source of over voltage can be lightning, atmospheric disturbaces etc.

The SPV array shall be suitably protected against lightning by deploying required numbers of lightning arrestors. Lightning protection should be provided as per NFC 17-102:2011 standard.

EARTHING PROTECTION: -

PV array, Module mounting structure, DC equipment, Inverter, AC equipment and distribution wiring should be grounded / earthed properly as per IS: 3043-1987. In addition the lighting arrester / masts should also be earthed inside the array field. Earth Resistance shall be tested in presence of the representative of HAL as and when required after earthling by calibrated earth tester. PCU and ACDPB should also be earthed properly.

Test point shall be Provided for each earth pit.

Earth resistance shall not be more than 5 Ohms. Bidder can offer any type of earthing to achieve the desired result with prior approval of HAL. It shall be ensured that the earthling points are bonded together to make them at the same potential.

GRID ISLANDING

In the event of a power failure on the electric grid, it is required that any independent power -producing inverters attached to the grid turn off in a short period of time. This prevents the DC-to-AC inverters from continuing to feed power into small sections of the grid, known as "islands present a risk to worker who may expect the area to be unpowered, and they may also damage grid- tried equipment. The Rooftop PV system shall be equipped with islanding protection and comply with IEC 62116. In addition to disconnection from the grid (due to islanding Protection) disconnection due to under and over Voltage conditions shall also be provided.

A manual disconnect 4-pole isolation switch beside automatic disconnection to grid would have to be provided at utility end to isolate the grid connection by the utility personnel to carry out any maintenance.

CABLES

Cables of appropriate size to be used in the system shall have the following characteristics:

Shall meet IEC 60227/IS 694, IEC 60502/ISI554 Standards

Temp. Range: -10 °C to 80 °C

Voltage rating 1100V/ 1.5 kV

Excellent resistance to heat, coat , water, oil abrasion, UV radiation

Flexible

All cable/ wires are to be routed in a GI cable tray and suitably tagged and marked with proper manner by good quality ferrule or by other means so that the cable can be easily identified. The GI cable trays with covers should be suitably mounted on the roof.

Contractor should indicate size and length of cables as per system requirements.All the cables required for the Plant should be provided by the contractor. All cable schedules/ layout drawings should be submitted to HAL and approved prior to installation. Any change in cabling sizes, if desired by contractor, should be supported reasons.

Multi Strand, Annealed high conductivity copper conductors with PVC type 'A' Pressure extruded insulation or XLPE insulation should be used. Overall PVC/XLPE insulation should be provided for UV protection Armored cable for Underground Laying.

The size of each type of DC cable shall be 4 sqmm with TUV certification. However, the Maximum drop shall be Limited to 1%

For the AC cabling, PVC or, XLPE insulated and PVC sheathed single or, multi-core multi-stranded flexible copper/ aluminum cables shall be used; outdoor AC cables shall have a UV-stabilized outer sheath.

The DC cables from the SPV module array shall run through a UV-stabilized PVC conduit pipe of adequate diameter with a minimum wall thickness of 1.5 mm.

Cables and wires used for the interconnection of solar PV modules shall be provided with solar PV connectors (MC4) and couplers.

All cables and conduit pipes shall be clamped to the rooftop, walls and ceilings with thermo-plastic clamps at intervals not exceeding 50 cm; the minimum DC cable size shall be 4.0 mm² copper; In three phase systems, the size of the neuteral wire size shall be equal or half to the size of the phase wires.

Cable jacket should also be electron beam cross-linked XLPO, flame retardant, UV resistant and black in color.

All cables and connectors for use for installation of solar field must be of solar grade which can withstand harsh environment conditions includijng High tempretures, UV radiation, rain, humidity, dirt, burial and attack by moss and microbes for 25 years and voltage as per latest IEC standards. DC cables used from solar modules to array junction box shall be solar copper (Cu) with XLPO insulation and rated for 1.1 kV as per relevant standards only.

The ratings given are approximate. Bidder to indicate size and length as per system design requirement. All the cables required for the plant shall be provided by the bidder. Any change in cabling sizes if desired by the bidder shall be approved after citing appropriate reasons. All cable schedules/ layout drawings shall be approved prior to installation.

The total voltage drop on the cable segments from the solar PV modules to the solar grid inverter shall not exceed 2.0%.

DATA ACQUISITION SYSTEM

Data Acquisition system shall be provided for the solar PV Plant

Data Logging Provision for plan Monitoring, time and data stamped data logs analysis. Metering and Instrumentation for display of system parameters and status indication to be Provided.

Solar Irradiance: An integrating pyranometer (Class II or better, along with calibration certificate) should be provided, with a sensor mounted in the plane of array. Read out from the pyranometer should be integrated with the data logging system.

Temperature : Temperature probes for recording the solar panel temperature and ambient temperature is to be provided complete with readouts integrated with the data logging system.

The Following Parameters should be accessible via the operating interface display in real time separately for solar power Plant:

AC Voltage.

AC Output current.

Output power

Power factor.

DC Input Voltage

DC Input current

Time Active.

Time disabled.

Time Idle.

Power produced

Protective function limits Viz-AC Over Voltage, AC Under Voltage, Over Frequency, Under Frequency ground fault, PV Starting voltage, PV Stopping Voltage

PV Array energy Production: Digital Energy Meters to log the Actual value of AC/DC Voltage, Current & Energy generated by the PV system Provided.

String and array DC Voltage, current and power, Inverter AC output Voltage and current (All 3 phases and lines), AC power (Active, Reactive and Apparent), Power factor and AC energy (All 3 phases and cumulative) and frequency shall be monitored.

The time interval between two sets of data shall not be more than 10 minutes. (A min. of 6 samples of data shall be recorded per hour.

Data Acquisition System shall have real time clock and internal reliable battery backup (2 hour)

The data shall be accessible from a desktop/laptop either through internet or direct connectivity. HAL shall arrange the desktop/laptop.

PLANNING AND DESIGNING

The contractor should carry out Shadow Analysis at the site and accordingly design strings & array layout considering optimal usage of space, Material and labor. The contractor should submit the array layout drawing along with Shadow Analysis Report to HAL for approval.

The Contractor should also consider the structural aspects of the building and design the layout in consultation with HAL representatives.

The contractor should submit the drawing of ACDPB for approval of HAL

HAL reserves the right to modify the layout specification of sub-system and components at any stage as per local site conditions/ requirements.

The Contractor shall submit three sets in hard copy of final drawing for formal approval to proceed with Construction work.

TESTING REQUIREMENTS (To be tested and recorded after commissioning in presence of HAL representative(s))

PARAMETER

Make and Model

Visual

Visual and Physical

Name plate Ratings

Laboratory test under standby and part load conditions

IP Ratings

Input Channels

No. and Type

10 minutes

Continuity

Monitor at array combiner box. Apply solar radiation and temperature correction factors to STC specification.

Continuity

Continuity

Continuity

Terminations

Visual

Strain Relief

Fitment

Fitment

Operation

Operation

Operation

48 hour operation

Power Performance Ratio at 1 hour interval for 48 hours operation

Energy Performance Ratio at 1 hour interval for 48 hours operation

TOOLS & TACKLES AND SPARES

After completion of installation & commissioning of the power plant, List of tools & tackles are to be provided by the contractor for maintenance purpose.

A list of requisite spares in case of PCU/inverter comprising of a set of control logic cards, IGBT driver cards etc., Junction Boxes. Fuses, MOVs / arrestors, MCCBs etc along with spare set of PV modules should be indicated.

TRAINING

DANGER BOARDS AND SIGNAGES

SAFETY MEASURES

FIRE EXTINGUISHERS

DRAWINGS & MANUALS

Two sets of Engineering, electrical drawings and Installation and O&M manuals are to be supplied. Contractor shall provide complete technical data sheets for each equipment giving details of the specifications along with make/makes in their bid along with basic design of the power plant and power evacuation, synchronization along with protection equipment.

Approved ISI and reputed makes for equipment should be used.

For complete electro-mechanical works, contractor shall supply complete design, details and drawings for approval to HAL before progressing with the installation work.

The Contractor shall furnish the following drawings/documents after Award of work and obtain approval.

General arrangement and dimensional layout

Schematic drawing showing the requirement of SPV panels, Power conditioning Unit(s)/ inverter, Junction Boxes, AC and DC Distribution Boards, meters etc.

Structural drawing along with foundation details for the structure.

Itemized bill of material for complete SV plant covering all the components and associated accessories.

Layout of solar Power Array

Shadow analysis of the roof

Drawing of ACDPB

SCOPE OF MAINTENANCE OF SPV POWER PLANT

All materials, components of the power plant during the period of maintenance shall be the property of HAL. Regular maintenance of the SPV Power Plant for a period of 5 years after commissioning along with supply of consumable items as and when necessary and submission of performance data of power plant shall come, under the maintenance contract.

The break down maintenance of the entire system including supply of necessary spare parts, if any, during the period of maintenance is included in the scope. The maintenance schedule of the SPV power plant during the 5 years period shall be as detailed below.

5 years maintenance period shall begin on the date of commissioning and acceptance of the power plant. Qualified & trained personnel shall be deputed to carry out the maintenance. Service reports should be submitted for each quarterly visit and breakdown visits.

During maintenance period of the power plant, if there is any loss or damage of any component of the power plant due to miss management / miss handing or due to any other reasons, what-so-ever, the supplier shall be responsible for immediate replacement / rectification. The damaged component may be repaired, if it is understood after examination that after repairing performance of the component shall not be degraded, otherwise the defective component shall have to be replaced by new one without any extra cost.

List of spare parts to be supplied along with the systems may be specified in the bid.

Re-coating of exposed surfaces to prevent rusting & replacement of worn out parts shall be carried out along with the maintenance of the PCU.

Replacement & repair of damaged parts shall be carried out immediately during the O&M period so as to ensure at least 95% uptime.

In case of any fault, the fault must be removed within 12 hours failing which a penalty of Rs.1,000/- per day shall be charged. In case of any part to be imported the maximum period for repair should not be more than 5 days. However, under Force Majeure circumstances penalty can be waived off.

Routine and Preventive maintenance shall include, but not limited to, checks and maintenance activities as per the below schedule.

Activity

Visual inspection of all components and Internal inspection of Combiner Boxes

Check voltage of solar PV panels

Evaluation of energy meter readings taken by client and report thereof

The offers complying with technical specifications only will be considered for opening the respective commercial bids.

Completion period: The entire package has to be completed within 3 months from the date of issuance of Purchase Order.

Parameters

Overall conditions of serviec

Overall Grid Standards

Equipment

Safety and Supply

Meters

Harmonic current

Synchronization

Voltage

Flicker

Frequency

DC injection

Power Factor

Islanding and Disconnection

Overload and Overheat

Applicable For

IS 16221 Part II

IS/IEC 62305

IS/IEC 69947

IEC/IS 60947 PART I,II&III