Space Age Ssu-Pam-Sd, Multi-Voltage Series Relay, 7A, Spdt, Encapsulated Enclosure Provides 7A Form "C" Contacts May be energized from input voltage between 20VDC to 32VDC Ideal for 24VDC NAC circuits Inputs are polarity sensitive and diode protected Additional set of wires for redundant input voltage (circuit supervision pass-through)