Siemens Industrial Controls 49AB01 N/C Auxiliary Contact Kit

The Siemens Industrial Controls 49AB01 N/C Auxiliary Contact Kit is a snap-on contact part used in contactors and motor starters in HVAC systems. It has a normally closed signaling contact that operates to change condition in response to the main contactor operation. It is placed in control panels for compressors, fans, or pumps, where it is used for interlocking or enabling control circuits. It operates as a unit that extends the signaling capability of the main contactor without carrying load current, supporting sequencing and control in heating, ventilation, and refrigeration equipment.