ABB CAL18-11B Auxiliary Contact Block

The ABB CAL18-11B is a side-mounted auxiliary contact block designed for use with ABB's A-line and AL-line contactors, providing additional switching capabilities in industrial control systems. This compact accessory features a 1 normally open (NO) and 1 normally closed (NC) contact configuration, making it ideal for applications requiring signal feedback, interlocking, or control circuit expansion in motor starters, lighting controls, and automation panels. Key benefits include reliable performance in harsh environments, easy snap-on installation without tools, and compliance with international standards like IEC 60947-5-1 and UL/CSA ratings (A600 for AC, Q300 for DC). It supports voltages up to 690V and is suitable for AC-15 and DC-13 utilization categories, offering high electrical endurance with up to 10 million operations. Advantages over similar products include ABB's robust build quality, which reduces downtime, and compatibility with a wide range of contactor sizes (A9 to A300). Drawbacks may include limited contact options compared to multi-block alternatives and the need for specific mounting on compatible contactors. This used unit shows minor wear but remains functional for cost-effective upgrades in manufacturing, HVAC, and process control systems.