RMSO/SPO SERIES - BIMETALLIC OVERLOAD RELAYS RMSO/SPO Series Overload Relays are bimetallic-style relays designed to protect AC-3 circuits (up to 150A @ 690V) and motors against overloads, phase failure, long starting times and stalling of the motor. RMSO and SPO Series overload relays can be integrally mounted to Benshaw RC and RSC contactors for thermal overload protection. Ratings up to 800A and up to 690V • IP20 protection (IEC 60 529) • Trip indicator • Reset button/selector for manual or auto reset • Test trip device • Available as class 10 or class 20 • Finger-safe terminals • Overload adjustment dial cover • 1 NO and 1 NC auxiliary contacts • Identification labels • Temperature compensation • -60°C to 70°C storage temperature range • -5°C to 55°C operating temperature range • Differential-type phase loss protection • Add-on accessories available • Close couple to RC contactors Simple, fully adjustable overload relays. Full Voltage Controls | Motor Protection 17
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