NXC Contactor Series (25 to 38 A)

A. Product Overview

The CHINT NXC Contactor Series in the 25 A to 38 A range is engineered for frequent switching of AC motors and power circuits under industrial operating conditions. These contactors are part of the widely adopted NXC platform, compliant with IEC/EN 60947-4-1 standards, and are suitable for AC-3 motor duty applications.
This current range is typically selected for small to medium induction motors used across manufacturing plants, utilities, and infrastructure projects. The contactor body includes built-in auxiliary contacts for control feedback, and is compatible with CHINT thermal overload relays and auxiliary accessories, enabling standardized starter assemblies in motor control centres.

B. Working Principle

The NXC contactor operates using an electromagnetic coil. When the rated control voltage is applied to the coil terminals, the magnetic field pulls the armature, closing the main power contacts and energizing the connected motor or load. When the control voltage is removed, spring force opens the contacts and disconnects the circuit.
The contacts are designed to withstand repetitive making and breaking of motor currents, including inrush during motor starting, within the specified utilization category. The contactor itself does not provide overload or short-circuit protection and must be used in coordination with a thermal overload relay and upstream short-circuit protective devices.

C. Key Applications

• Oil & Gas: Utility pumps, ventilation fans, and auxiliary motors in non-hazardous areas

• Chemical & Process: Agitators, transfer pumps, and small process motors

• Power & Utilities: Station auxiliary motors, cooling fans, and service water pumps

• Pharma: AHU motors, clean utility pumps, and packaged equipment panels

• Food & Beverage: Conveyors, mixers, compressors, and process auxiliaries

• Water & Wastewater: Borewell pumps, booster pumps, aerators, and blowers

• HVAC & Utilities: Chiller auxiliaries, cooling tower fans, and air handling units

D. Why Industries Use This Product

Industries rely on the NXC 25–38 A contactors for dependable motor switching, long electrical and mechanical life, and ease of integration into standardized starter designs. Proper motor control is critical to prevent issues such as contact welding, overheating, nuisance tripping, and premature motor failure.
Using a correctly rated contactor matched to motor current and duty cycle reduces downtime, supports safe isolation during maintenance, and ensures compliance with electrical standards. Incorrect selection or undersizing can lead to excessive contact wear, overheating, and unplanned shutdowns.

E. Suitable Buyers

• OEMs building standardized motor starters and packaged equipment

• EPC contractors executing industrial electrical and utility projects

• Maintenance and utilities teams for replacement in existing MCCs

• Plant engineering and procurement teams for retrofit and expansion projects
  These contactors are commonly used for replacement in installed NXC-based systems and are preferred in standardized installations due to consistent dimensions and accessory compatibility.

Quick Answers

What is the CHINT NXC Contactor Series (25–38 A)?
It is a range of three-pole AC contactors designed for switching and control of small to medium induction motors in industrial low-voltage systems.

Where are NXC 25–38 A contactors used?
They are used in MCCs, pump panels, HVAC systems, and utility motor control panels across multiple industries.

Why is this contactor range required in industry?
It provides reliable motor switching, supports standardized starter assemblies, and helps reduce electrical and mechanical failures when correctly coordinated with protection devices.

Who typically uses NXC 25–38 A contactors?
OEMs, EPC contractors, system integrators, and plant maintenance and procurement teams.

FAQ Section

1) What motor sizes typically use 25–38 A contactors?
This range is generally selected for small to medium induction motors used in pumps, fans, compressors, and conveyors. Final selection should be based on motor full-load current, starting method, duty cycle, and ambient conditions rather than motor kW alone.

2) Do NXC contactors provide overload protection?
No. The contactor is a switching device only. It must be used with a compatible thermal overload relay for motor overload protection and with an upstream MCB, MCCB, or fuse for short-circuit protection.

3) Are auxiliary contacts included as standard?
Yes. NXC contactors in this range typically include built-in auxiliary contacts for control and feedback. Additional auxiliary contact blocks can be added if more NO/NC points are required for interlocking or PLC signals.

4) Can these contactors be used for HVAC applications?
Yes. They are commonly used for HVAC motors such as AHUs, cooling tower fans, and chiller auxiliaries, provided the motor current and utilization category are within the contactor’s ratings.

5) What are common installation considerations?
Ensure correct coil voltage selection, proper tightening torque on terminals, adequate ventilation inside the panel, and coordination with overload relays. Poor termination or incorrect coordination can lead to overheating and reduced service life.