CTR Series 3-Phase AC Solid State Relays Crydom CTR Series 3-Phase AC Solid State Relays feature ratings of 25A per phase @ 600VAC. With a DIN-RAIL or panel mount 90mm width package, the CTR Series is 100K-cycle UL 508 Endurance Rated for Enhanced Reliability and is CE, RoHS, and EMC compliant. Featuring SCR output for heavy industrial loads, the Crydom CTR Series 3-Phase AC Solid State Relays also offer the IP20 Touch Safe Design, an LED input status indicator, AC or DC control, and zero-crossing (resistive loads) or random-fire (inductive loads) output.