Protection Relays

Bookmark and Share

External network and system protection (NS protection) used to disconnect power generation systems from the grid by coupling switches in the event of inadmissible threshold values. If voltage and frequency measurements on the power generation system are outside the thresholds required in applicable standards (such as G59/3)

Anti-Islanding Boxes

These anti-islanding boxes come complete and pre-wired for easy  installation. The anti-islanding device consists of a Ziehl anti-islanding relay (model UFR1001E or model SPI1021), the required circuit breakers and a 63A contactor.

Some inverters are not certified to connect to the UK grid, these anti-islanding boxes can enable them to be connected. No interface with the inverter is required.

AI-B1 | 63A anti-islanding box for single-phase systems, complies with:

  • G98 & G99

AI-B3 | 63A anti-islanding box for three-phase systems, complies with:

  • G98 & G99
  • VDE-AR-N 4105
  • ÖVE/ÖNORM E 8001-4-712
  • DIN V VDE V 0126-1-1/A1 / NOI-RES_13E
  • NRS-097-2-1
Anti-Islanding Box Closed
Anti-Islanding Box Open
Product Added! click here to view basket Failed! Could not add product to basket, please try again.
Product Code Description Retail Price
(ex VAT)
AI-B1 Single phase G99 anti-islanding box 63A £743.40
AI-B3 Single & Three phase G99 anti-islanding box £843.36