Description
ABB CAL4-11 Auxiliary Contact Block is an electrical control accessory which offers extra signaling and switching capacity to contactors and motor starters. It has one normally closed and one normally open contact set which allows the monitoring or control of separate circuits during operation in air handlers, furnaces and packaged HVAC systems. The block is simply connected to the main contactor or control part, and is connected into the control wiring. This component can be used to provide more reliable auxiliary contacts and enhance control logic, interlock operates, and provide safer and more coordinated system operation.
