Crydom 1-Phase Zero Switch Solid State Relay, SCR O/P, Rated Operational Voltage: 24-400 VAC, Control: 4-32 VDC, Operational Current: 50 Arms. The Series XBP has an output featuring low off-state leakage, zero and random voltage switching Manufactured in Crydom’s ISO 9001 Certified facility for optimum product performance and reliabilityGeneral Characteristics