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  3A20 Pilot Wire Intertrip Send & Receive Relays

  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 the…