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Auxiliary contact block
Auxiliary contact blocks are essential switching devices designed to signal the status of main switching apparatus such as contactors, circuit breakers, and motor starters. These blocks, often referred to as add-on contacts or signal contacts, provide electrical isolation for control circuits by offering normally open (NO) and normally closed (N...
Auxiliary contact blocks are essential switching devices designed to signal the status of main switching apparatus such as contactors, circuit breakers, and motor starters. These blocks, often referred to as add-on contacts or signal contacts, provide electrical isolation for control circuits by offering normally open (NO) and normally closed (NC) configurations. They are typically rated for low-voltage control signals, with common amperages ranging from 1A to 10A at 24V DC or 230V AC, and are available in various pole configurations like 1NO+1NC, 2NO+2NC, or 4NO+4NC. The mounting is usually side-mounted or front-mounted, depending on the main device, and they comply with standards such as IEC 60947-5-1 for industrial control applications.
These blocks are widely deployed in industrial automation panels, motor control centers (MCCs), and distribution boards to provide feedback signals for PLCs, SCADA systems, or simple relay logic. They are critical in sectors like manufacturing, water treatment, HVAC, and energy distribution, where precise status monitoring of circuit breakers or contactors is required. In high-vibration environments, auxiliary contact blocks with screw or spring-cage terminals ensure reliable connections, while IP20 protection is standard for indoor use.
Key subcategories include front-mounted auxiliary contact blocks for compact breakers, side-mounted blocks for modular contactors, and universal blocks for retrofit applications. Common article codes follow patterns like "AX-1NO1NC-24V" or "AUX-2NO2NC-230V", where the prefix indicates the series (e.g., "AX" for auxiliary), followed by contact configuration and voltage rating. For example, the "AX-4NO4NC-110V" block offers four NO and four NC contacts for 110V DC control circuits. These blocks are often sold as accessories for specific breaker or contactor families, such as those for TeSys or NZM series.
At Electric Automation Network, we provide a comprehensive range of auxiliary contact blocks with real-time pricing and technical datasheets for each article. Our engineering team offers personalized support to help you select the correct block for your main device, ensuring compatibility and optimal performance. With express worldwide shipping, we minimize downtime for your projects, whether for new installations or urgent replacements.
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