NOTE: Unused input wires must be insulated! The white wire is common to the transformer windings and has nothing to do with the external circuitry Inputs may only be used in a single set, if the inputs are used for 120V, only the white and black wires need to be connected. Other colors (red, orange) must be insulated. If the inputs are used for 208V, only the white and red wires need to be connected. Other colors (black, orange) must be insulated. If the input is used for 240V, only the white and orange wires need to be connected. Other colors (black, red) must be insulated Primary Voltage: 120/208/240 V AC ,Secondary Voltage: 24 V AC , Directly tested with a multimeter is no-load voltage: AC26.6V-27.5V Power Rating：40 VA Compatibility: Transformers can be used in industrial, heating and air conditioning controls including air conditioning circuits, relays and gas valves or other applications up to the listed ratings NOTE: Unused input wires must be insulated! The white wire is common to the transformer windings and has nothing to do with the external circuitry Inputs may only be used in a single set, if the inputs are used for 120V, only the white and black wires need to be connected. Other colors (red, orange) must be insulated. If the inputs are used for 208V, only the white and red wires need to be connected. Other colors (black, orange) must be insulated. If the input is used for 240V, only the white and orange wires need to be connected. Other colors (black, red) must be insulated