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Isolation Switches


DC Isolation Switches


These are used between high voltage DC PV arrays and grid-connect inverters. They are located adjacent to the inverter and are required to provide a means of manually isolating the entire PV array during system installation or any subsequent maintenance.

The switch must be rated for system voltage (1.15 x string open circuit voltage Voc) and current (1.25 x string short circuit current Isc).

DC isolators can be provided with 600mm long MultiContact cables and connectors.

This then allows the entire DC side of the PV installation to be completed by making only plug & socket connections. Thus eliminating the possibility of wiring error or accidental exposure to dangerously high DC voltages during installation.

Note: A PV array is unusual in that it cannot be turned off - terminals will remain live at all times during daylight hours. It is important that all junction boxes and switchgear is suitably labelled. 

PV-SW16
 
Model Number Description Data Sheet
PV-SW16 2 pole DC isolator switch in enclosure 16A 750VDC Data Sheet
PV-SW32 2 pole DC isolator switch in enclosure 32A 750VDC





AC Isolation Switches


These are required to provide a means of manually isolating the AC supply to a grid-connect inverter.

Two AC isolation switches need to be provided between the inverter and the point of connection to the supply. One adjacent to the inverter and one adjacent to the consumer unit (Only one is needed if in the same room). The one adjacent to the consumer unit must be readily accessible and capable of being locked in the off position only. Switches must be double pole and suitably labelled.

AC isolation switchDouble pole single throw switch lockable in the off position only, mounted in enclosure. Rated: 230/400 Vac.

Model Number Description
AC-SW1 4 pole 20A AC lockable isolator switch in enclosure
AC-SW2 4 pole 32A AC lockable isolator switch in enclosure


G59 Protection Relays


These are usually required for grid-connect inverter systems greater than 5kW in size and provide additional protection. They are located between the inverters and the point of connection to the supply. POA.

OfGem Approved Ac kWh Meters


OfGem approved ME-AC100CPThese are used to accurately record wind or PV generation. OfGem approved to allow ROC’s or other payments for on-site generation to be claimed. They are located between the inverters and the point of connection to the supply. Include pulsed output for connection to displays.
Model Number Description Data Sheet
ME-A100CP Single Phase kWh meter c/w pulse output (digital) Data Sheet
ME-171 Three Phase kWh meter (digital)
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