CHINT NXM-125 S MCCB – 125A, 3 Pole, 25kA, Fixed Trip Unit

Premium Quality | Industrial & Commercial Electrical Protection

1. Product Overview

The CHINT NXM-125 S Molded Case Circuit Breaker (MCCB) is a low-voltage circuit protection device designed to protect electrical circuits and connected equipment against overloads and short circuits. Its compact molded-case construction makes it suitable for industrial distribution boards, commercial electrical installations, and power control panels.

With a rated current of 125A, a three-pole configuration, and a 25kA ultimate short-circuit breaking capacity at the specified operating voltage, this MCCB provides dependable protection for three-phase electrical distribution systems.

2. Complete Technical Specifications

Technical note: The product image and model information support the ratings above. The exact voltage-dependent breaking capacity, current tolerances, trip characteristics, and other model-specific details should be verified against the current CHINT datasheet before final engineering approval.

3. Protection Functions

Overload protection: The thermal release responds to sustained overcurrent conditions that may cause excessive heating of cables and electrical equipment.

Short-circuit protection: The magnetic release operates under high fault-current conditions to interrupt the circuit and reduce potential damage.

Circuit isolation: The breaker can be operated to disconnect a circuit for appropriate maintenance and isolation procedures. Follow the applicable electrical safety and lockout/tagout requirements.

Fixed trip characteristics: The thermal-magnetic trip settings are factory-defined for the specified breaker version rather than user-adjustable electronic settings.

4. Electrical Performance

• 125A rated current: Intended for circuits designed around the selected breaker rating, subject to load calculations and installation conditions.
• 25kA ultimate breaking capacity: The maximum rated short-circuit current the breaker can interrupt under its specified test conditions at the applicable voltage.
• Ics = 100% Icu: The product marking indicates a service breaking capacity equal to its ultimate breaking capacity for the stated rating.
• 50/60Hz operation: Suitable for systems operating at either of these frequencies, subject to the manufacturer’s ratings.
• Three-pole switching: Provides switching and protection of the three phase conductors. Neutral protection is not provided by a three-pole device.

5. Construction and Design

The NXM MCCB series uses a molded insulating case with an integrated switching mechanism and trip unit. The product design incorporates:

• Three-pole switching arrangement.
• Front operating handle for ON/OFF operation.
• Line and load terminal connections.
• Integrated thermal-magnetic trip mechanism.
• Molded insulating enclosure.
• Compact construction for installation in compatible electrical panels.

Actual terminal dimensions, conductor ranges, terminal torque, accessories, and mounting clearances must be checked in the applicable manufacturer installation manual.

6. Typical Applications

This MCCB may be used in appropriately designed installations such as:

• Main and sub-distribution panels.
• Industrial electrical control panels.
• Commercial buildings and facilities.
• Three-phase machinery and equipment feeders.
• Motor feeder circuits, where the protection and starting requirements are correctly coordinated.
• Low-voltage distribution boards.
• Suitable solar AC distribution and auxiliary power circuits, subject to system design and manufacturer approval.

The breaker should not be selected solely on rated current. The prospective fault current, voltage, load characteristics, cable ampacity, coordination requirements, and installation conditions must also be assessed.

7. Installation and Selection Considerations

Before installation, verify the following:

1. The system voltage and frequency are within the manufacturer’s ratings.
2. The prospective short-circuit current at the installation point does not exceed the applicable breaking capacity.
3. Cable size, conductor material, and terminal compatibility are appropriate for the circuit.
4. The breaker rating and trip characteristics coordinate with the connected load and upstream/downstream protective devices.
5. Mounting dimensions, clearances, terminal torque, and enclosure requirements comply with the installation manual.
6. Installation and testing are carried out by qualified electrical personnel with the circuit safely isolated.

8. Compliance and Verification

The CHINT NXM series is listed by the manufacturer under IEC 60947-2 for low-voltage circuit breakers. Confirm that the supplied product’s exact model, ratings, markings, and applicable certificates meet the project’s specifications and local regulatory requirements.

9. Product Advantages

• Reliable overload and short-circuit protection when correctly selected.
• Three-pole protection for three-phase distribution circuits.
• Fixed thermal-magnetic trip design.
• 25kA breaking-capacity rating at the specified operating voltage.
• Compact molded-case construction.
• Suitable for a range of industrial and commercial distribution applications.
• Manufactured within the CHINT NXM MCCB product family.

10. Product Identification

Product name: CHINT NXM-125 S MCCB, 125A, 3P, 25kA, Fixed Thermal-Magnetic Trip

Suggested SKU: CHINT-NXM-125S-3P-125A-25KA

The suggested SKU is for VITS website catalog organization and is not an official CHINT ordering code.

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12. Pricing and Availability

Contact VITS for current pricing, stock availability, delivery lead time, and project or bulk-order quotations.

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The molded case circuit breaker will provide protection for the circuit and equipment
in case of overload, short circuits and under-voltage conditions occurred in the power
distribution circuit. Besides, it can also provide protection of overload, short circuits and
under voltage for the non-frequent start of the motor

Certificates: KEMA, ESC, UKrSEPRO, PCT, RCC, KC
Electric Ratings: AC 690V, 50/60Hz
Standard: VITS/EN 60947-2
Frame Size: 63A, 125A, 160A, 250A, 400A, 630A, 800A, 1000A, 1250A, 1600A
Installation Method: Fixed Type; Plug-in Type