1SBN040100R1010 ABB WA4-10 Mechanical Interlock Auxiliary Contact Accessory 1NO

Why Choose the ABB WA4-10 Mechanical Latching Unit?

The ABB WA4-10 is a reliable mechanical latching unit accessory designed for ABB AF contactors and NF contactor relays. As part of the ABB AF contactor accessory range, it allows standard contactors to be converted into compact latched contactors that remain mechanically switched on even when coil voltage is removed.

This accessory provides an efficient solution for applications where contactor retention is required after a switching impulse. The WA4-10 uses a mechanical latching mechanism with 24 V DC electromagnetic impulse unlatching and manual release capability, making it suitable for energy-saving control systems and PLC-based automation applications.

Designed for ABB AF(C)09…AF(C)38 contactors and NF(C)(Z) contactor relays, the WA4-10 features a compact front-mounted design and allows additional CA4 and CAL4 auxiliary contact blocks to be fitted for expanded control functionality.

Key Advantages

• Dedicated ABB mechanical latching accessory for AF contactors.
• Converts standard contactors into latched contactor solutions.
• 24 V DC impulse unlatching enables efficient control systems.
• Maintains contactor status during coil voltage failure.
• Supports direct PLC control without additional interface relay in suitable applications.
• Compact design reduces panel space requirements.

Key Features

• ABB WA4 mechanical latching unit series.
• WA4-10 model.
• 24 V DC electromagnetic impulse unlatching.
• Manual unlatching button on the front face.
• Mechanical retention of contactor switching position.
• Front mounting on compatible ABB contactors.
• Compatible with CA4 front-mounted and CAL4 side-mounted auxiliary contact blocks.
• Designed for AF09…AF38 contactors and NF contactor relays.

Reliable Contactor Retention for Industrial Automation

Mechanical latching accessories such as the ABB WA4-10 provide reliable contactor retention in applications where continuous coil energisation is unnecessary or undesirable. This improves energy efficiency while maintaining reliable switching operation during control voltage interruptions.

The WA4-10 is designed for automation engineers and machine builders who require dependable contactor control, reduced panel complexity and flexible integration with ABB AF contactor systems.

Typical Applications

• Industrial motor control panels.
• Energy-saving contactor control systems.
• PLC-controlled automation equipment.
• Machine building applications.
• Industrial switching assemblies.
• OEM electrical control panels.