Technical Specifications Specification Value / Description Product / Model CM-MPS.21S three-phase monitoring relay Part Number 1SVR730885R3300 Function Phase failure detection, phase sequence monitoring, over-/under-voltage detection, phase unbalance detection, interrupted-neutral detection Measured / Supply Voltage 3 × 180 … 280 V AC (phase-to-neutral) Frequency 50 / 60 Hz Output Contacts 2 × change-over (SPDT / DPDT) contacts Contact Ratings AC-12 (general load): 4 A @ 230 V AC AC-15 (inductive/motor-control load): 3 A @ 230 V AC DC-12: 4 A @ 24 V DC DC-13: 2 A @ 24 V DC Switching Capacity (minimum) 24 V, 10 mA Trip / Delay Settings Start-up delay: 200 ms Trip delay adjustable: 0.1 … 30 s Selectable ON-delay or OFF-delay Connection / Terminals Screw terminals; flexible 1×0.5–2.5 mm², rigid 1×0.5–4 mm² Mounting DIN-rail (TH35) or panel mounting Dimensions (W × H × D) 22.5 mm × 85.6 mm × 103.7 mm Net Weight ~0.146 kg Ambient / Operating Temperature –25 … +60 °C Storage Temperature –40 … +85 °C Insulation / Impulse Withstand Input/output insulation 600 V; impulse withstand: input 6 kV, output 4 kV Protection / Standards Housing: IP50; Terminals: IP20; IEC/EN 60255-27; UL/CSA B300 contact rating Functions Phase monitoring, adjustable thresholds, adjustable trip delay, ON/OFF delay selection