The ANSI-certified and UL-listed unit is rated for 120/240 VAC and 10,000 AIR. Do not continue if power is present on a circuit breaker other than Service Disconnect or Main circuit breaker, until the power source has been shut off. The Square D by Schneider Electric QO 50 Amp One-Pole Circuit Breaker is intended for overload and short-circuit protection of your electrical system. It is not safe to install a circuit breaker in an electrical panel that still has power flowing to it.Testing at the Service Disconnect or Main circuit breaker is not recommended due to this "seemingly conflicting" information. The bus bar should have no power present when this breaker is OFF. The output of the Main or Service Disconnect when located in the panel, connects to the bus bar. Siemens QP breakers provide easy plug-in connections in Siemens enclosures and the time saving Insta-Wire feature.
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