Benshaw SPO-400H-250ABenshaw SPO Class 20 Bimetallic Overload Relay (200 300A Direct Mount to RSC 300 and RSC 400 Contactors) Benshaw RMSO SPO Series Overload Relays are bimetallic style relays designed to protect AC 3 circuits and motors against overloads, phase failure, long starting times and stalling of the motor.
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