ABB AF-RA4 Control Relay

ABB AF-RA4 Control Relay

Additional Description: ABB -AF-RA4 INTERFACE RELAY RA4 FOR AF(Z)09_96 NON-CANCELABLE, NON-RETURNABLE

Catalog Description: RA4 interface relay is designed to receive 24 V DC signals delivered by PLCs or other sources with a low output power and to restore them with sufficient power to operate the coils of the relevant AF09 ... AF96 contactors or the NF contactor relays. RA4 interface relay is made up of a miniature electromechanical relay equipped with a N.O. contact and with a low consumption 24 V DC coil.The interface relay coil is controlled by the PLC while the N.O. contact ensures switching of the power contactor.Coil switching gives rise to overvoltages which have adverse effects on the electronic devices, insulators and, more generally, on component lifetime. The RA4 is protected from surge thanks to the built-in surge protection of AF09 ... AF96. Furthermore, the RA4 is protected against relay pole reversal by a diode inserted between the E1 and E2 input terminals.ConnectionThe "E1+" and "E2" input terminals must be connected, according to their polarity, to the PLC-output.The RA4 is equipped wi