| 摘要 |
<p>There is provided a circuit (10) that protects the electronic tripping circuitry (14) of a circuit breaker system from external transient high voltages and prolonged high voltage faults. The circuit (10) preferably includes a transzorb (24) that conducts in response to receiving a voltage signal having a magnitude greater than the breakdown voltage of the transzorb (24). This transzorb (24) clamps the output voltage to its breakdown voltage. The circuit (10) also includes a fuse (34) that is designed to blow in response to a prolonged high voltage fault.</p> |
