100 Amp 3-Pole 10 kA Type QP with Shunt Trip Circuit BreakerCircuit breakers provide a manual means of energizing and de-energizing a circuit. In addition, circuit breakers provide automatic overcurrent protection of a circuit. A circuit breaker allows a circuit to be reactivated quickly after a short circuit or overload is cleared. Unlike fuses, which must be replaced when they open, a simple flip of the breaker's operating handle restores the circuit. Siemens QP breakers provide easy plug-in connections in Siemens enclosures and the time saving Insta-Wire feature. Siemens offers three AIC ratings for these breakers: QP at 10K AIC, QPH at 22K AIC and HQP at 65 K AIC.