ABB 1SVR550805R9300 is a CM-MSE thermistor motor-protection relay that operates from 24 V AC and provides a single normally open (1NO) output contact. It is designed for overtemperature protection by monitoring motor-winding temperature via a thermistor and will de-energize the output if the motor overheats. Its 1NO contact is rated for up to 250 V and 4 A, enabling it to drive interposing relays or alarm circuits in motor-protection schemes. Listed in ABB's Measuring & Monitoring Relays catalog, this model is used for safeguarding small to mid-size motors in industrial automation.
