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WebMay 22, 2024 · Definition of circuit breaker. A device that is designed to open and close a circuit by non-automatic means, and to open the circuit automatically on a pre-determined overcurrent, without damage to itself when properly applied within its rating. In the US, the device must have an approval to UL 489. WebMaster Lock Grip Tight Circuit Breaker Lockout. SKU: 491B. The Master Lock Grip Tight Circuit Breaker Lockout – standard fits its standard height and tie-bar toggles normally found on 120 and 240 volt breakers. The 493B features highly durable construction with reinforced polymer and powder coated steel which aids operation in tough environments. WebApr 26, 2024 · Eaton-Cutler-Hammer Panel Generator Interlock-Kit - 1-1/2 to 1-1/4inch Space on Main & Branch Challenger CH/BR Series 150 or 200amp Circuit Breaker Box, Safety Manual Electric Lockout Transfer Switch 3.6 out of 5 stars 7 biting tooth