Key Specifications General Product Type: Three‑phase monitoring relay Model: CM‑MPS.21S ABB Part Number: 1SVR730885R3300 Function: Phase failure, phase sequence, over‑ & undervoltage, phase unbalance, interrupted neutral monitoring Mounting: DIN‑rail TH35/TH35‑7.5 Electrical Rated Control Supply Voltage / Measuring Voltage: 180 – 280 V AC, 50/60 Hz Output Contacts: 2 changeover (2 c/o / SPDT) Contact Rating: 250 V AC / 4 A Rated Operational Currents: AC‑12: ~4 A @ 230 V AC‑15: ~3 A @ 230 V DC‑12: ~4 A @ 24 V DC‑13: ~2 A @ 24 V Minimum Switch Capacity: 24 V / 10 mA Monitoring & Timing Adjustable Trip Delay: Instantaneous or 0.1 – 30 s Start‑up Delay: ~0.2 s Adjustable Threshold Values for Phase Conditions Mechanical Terminal Type: Screw / cage connection Mounting Position: Any Connecting Capacity (wire size): flexible up to ~2.5 mm², rigid up to ~4 mm² Overvoltage Category: III Pollution Degree: 3 Physical Width: ~22.5 mm Height: ~85.6 mm Depth: ~103.7 mm Weight: ~0.146 kg Environmental & Standards Operating Temperature: approx. −25 °C to +60 °C Degree of Protection: Housing IP50, terminals IP20 Certifications: IEC/EN 60255‑1, IEC/EN 61000 series EMC, CAN/CSA C22.2 No.14, UL508, CE, RoHS compliant