Auxiliary side contacts CTX3 4P 40-135A 1NO1NC 416849

Functional Expansion of Status Signaling in Industrial Switchgear

This auxiliary module is designed as a direct complement to CTX³ series contactors intended for circuits with currents ranging from 40 to 135 A. Its primary function is to provide a reliable signal indicating the current status of the main contacts – whether the circuit is closed or open. This enables installers to easily connect indicator lamps, relays, or PLC inputs without the need for additional external sensors. The "side-mount" construction allows for quick and secure locking of the module directly onto the contactor body, saving space in the distribution cabinet and eliminating the need for additional mounting rails or intermediate brackets.

Precision Engineering and Circuit Configuration Flexibility

Inside the housing, there is a set of contacts configured as 1NO/1NC (one normally open and one normally closed contact). This combination is extremely versatile in engineering practice. The normally open (NO) contact is ideal for signaling device operation – it illuminates a lamp when the contactor is energized. Meanwhile, the normally closed (NC) contact can serve for fault signaling or idle state indication, which is crucial in safety systems. The entire unit supports a rated current of 3 A at 230 V in category AC-15, covering the requirements of most standard control and signaling circuits. Electrical connections are made via screw terminals, ensuring durable connections even under vibrations typical of industrial environments.

Practical Benefits for Installation and Operation

• Fast Integration: The module can be mounted from the top or side (depending on the contactor model), allowing for a compact distribution board structure without the need to expand its width.
• Safety and Reliability: Robust screw connections minimize the risk of wire loosening, while precise contact mechanics ensure long service life even with frequent switching.
• Versatile Application: The 1NO/1NC configuration enables simultaneous control of two different functions (e.g., "running" signaling and blocking another circuit), simplifying electrical schematics.
• Compatibility: Dedicated exclusively to CTX³ contactors with currents of 40–135 A, eliminating the risk of incorrect replacement or incompatible mechanical components.

It is important to note that when designing the control system, the load characteristics must be considered – although this module handles standard control signals up to 3 A in category AC-15, it should not be used for directly switching large power loads. This is a purely signaling component that enhances the functionality of the entire starting system, providing full control over the operation of motors or other three-phase devices thanks to the precise side-mounting mechanism for 4P models.