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1-Phase, 3-Wire 120/240 V. When choosing the circuit breaker type, consider the overall voltage rating of the electrical system. This rating is calculated by the highest voltage that can be applied across all end ports. Also, the voltage distribution and circuit breaker integration apply during voltage calculation.The circuit breaker should have enough voltage capacity to meet the requirements of the end application.

1-Phase, 2-Wire 120 V with neutral. When choosing the circuit breaker type, consider the overall voltage rating of the electrical system. This rating is calculated by the highest voltage that can be applied across all end ports. Also, the voltage distribution and circuit breaker integration apply during voltage calculation.The circuit breaker should have enough voltage capacity to meet the requirements of the end application.

1-Phase, 2-Wire 240 V (No neutral). When choosing the circuit breaker type, consider the overall voltage rating of the electrical system. This rating is calculated by the highest voltage that can be applied across all end ports. Also, the voltage distribution and circuit breaker integration apply during voltage calculation.The circuit breaker should have enough voltage capacity to meet the requirements of the end application.

Also known as an Edison system, split-phase or center-tapped neutral. This is the most common residential service in North America. Line 1 to neutral and Line 2 to neutral are used to power 120 volt lighting and plug loads. Line 1 to Line 2 is used to power 240 volt single phase loads such as a water heater, electric range, or air conditioner.

3-Phase, 4-Wire 480Y/277 V. When choosing the circuit breaker type, consider the overall voltage rating of the electrical system. This rating is calculated by the highest voltage that can be applied across all end ports. Also, the voltage distribution and circuit breaker integration apply during voltage calculation.The circuit breaker should have enough voltage capacity to meet the requirements of the end application.

In larger commercial facilities the voltage is 277/480 volt and used to power single phase 277 volt lighting and larger HVAC loads (Three Phase)