Snap-Action Bimetal Disc Bimetal Switch Thermostat For Ballast Protection Description: Snap-action bimetal disc Fault conditions up to 100 amps Compact and eady to install Individually temperature calibrated and checked. The BRS design provides protection against various fault conditions, such as: locked rotor, running overload, low voltage, run both windings. Applications: Split-phase motors Split-phase motors Transformers Split-phase motors Solenoids Automotive accessory