Series: PGA 1100

The PGA-1100 series diode logic unit is an optional accessory for the Littelfuse arc-flash relays. It is used for tripping one circuit breaker with multiple arc-flash relays. Its purpose is to separate the trip paths so the breakers can be tripped independently from each other. Typical applications are switchboards with two incoming feeders and one tie-breaker or switchboards with several protected zones and tripping of a common upstream circuit breaker. The unit has three input diodes to handle the output of three arc-flash relays, and it also has three output diodes to handle the trip coils of three circuit breakers. If more than three relays/circuit breakers are needed, more units can be added by connecting terminal 8 of one box to terminal 4 of the next one, thus increasing the number of inputs and outputs with multiples of three. The PGA-1100 diode logic unit and arc-flash relays provide superior protection against the damaging effects of arc flashes and improve the lifespan of electrical equipment as well as the protection of personnel.