Front auxiliary contacts CTX3 3P (9-150A) / 4P (40-135A) 2NO 416851

Functional Extension for CTX³ Contactors

This auxiliary module enables quick and safe expansion of control capabilities in electrical circuits by mounting directly to the front of CTX³ series contactors. Thanks to its "front mount" design, the installer does not need to disassemble the entire device or use additional mounting rails – the contact block slides in from the top, significantly reducing the time required for control cabinet upgrades. Inside, it features 2 normally open contacts (2NO), ideal for indicating energization status or controlling further logic circuits.

Application and Technical Characteristics

The device is designed for operation in 230 V AC systems, where its function is to switch auxiliary currents. With a rated current of 3 A (for AC-15 characteristic), the module can easily handle typical loads such as:

• Indicator lamps,
• Coils of other contactors or relays,
• Audible and visual signalers.

A key construction element is the screw terminal connection, ensuring durable and mechanically stable wiring. This solution is preferred in industrial installations where vibrations could cause spring-loaded contacts to loosen. Top mounting preserves the aesthetics and organization within the cabinet while facilitating access to terminals during maintenance inspections.

Benefits for Installation and Operation

The selection of this specific model is based on its compatibility with the widely used Legrand CTX³ contactor series. There is no need to match adapters or seek alternative solutions – the module fits perfectly within the current range from 9 A to 150 A (3P versions) and 40 A to 135 A (4P versions).

Key user advantages include:

• Fast replacement: In case of failure or circuit configuration change, the module can be removed and installed within seconds without specialized tools.
• Safety: Robust screw terminals minimize the risk of short circuits caused by poor electrical contact.
• Versatility: Two normally open contacts are sufficient for most standard signaling applications in building and industrial automation.

It is important to note that when designing the circuit, current limitations must be considered – the module is not suitable for directly switching large motor loads but serves exclusively as a low-power control or signaling element.