Enhance the functionality of your Cutler Hammer contactors with the XTCEXFAC04 Auxiliary Contact Block. This front-mounted accessory provides additional contact configurations to meet your specific control needs. Designed for reliable operation, it seamlessly integrates with compatible contactor frames..The Cutler Hammer XTCEXFAC04 is a front-mounted auxiliary contact block designed for use with Cutler Hammer contactors. It features 4 normally closed (NC) contacts, providing sequential auxiliary switching capabilities. This accessory is compatible with contactor frames B and C.