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  3A20 Pilot Wire Intertrip Send & Receive Relays

  Description The operating element of the 3A20 Series is based on the well proven 6R heavy duty attracted armature control relay. The DC version of this relay is inherently immune to AC voltages & the addition of an AC filter circuit & copper shield over the core of the receive relay greatly enhances this attribute while maintaining high sensitivity to DC voltages. A mechanical flag indicator is provided on both…
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  3A300 Pilot Wire DC Intertrip System

  Description The 3A300 has been designed to integrate a complete scheme allowing bi-directional group intertripping of up to four remotely connected sites. Inherent 5KV or 15KV isolation allows application on electrical networks where large induced voltages may be experienced on the pilots. System reliability is provided by the extensive built in supervision facilities. Security is achieved through the high isolation & AC immunity of the intertrip receive elements. The efficient…
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  3A400 Pilot Wire Supervision System

  Features Integrated pilot wire supervision system for current differential protection schemes Operates using conventional metallic pilot wire (0 to 2K Ohm pilot resistance) Inherent 5KV or 15KV isolation No external components required Integrated pilot protection discrimination timer Extensive self supervision features to ensure functional integrity Supervision alarm contacts provided at both ends of pilot Simple to set up & commission Flush or 4U 19″ rack mounting M4 screws for control…