Product Overview

The Chint NM1 and NXM Series MCCBs are the industry standard for reliable circuit protection in low-voltage distribution systems. Engineered to protect circuits and equipment against overloads, short circuits, and undervoltage conditions, these breakers are essential for industrial manufacturing, commercial real estate, and renewable energy projects.

Covering a wide range of frame sizes from 125A to 800A, the Chint MCCB line is designed for both standard AC power distribution and specialized DC Photovoltaic (PV) applications. With a compact footprint and high breaking capacity, these breakers provide the flexibility needed for main incoming lines or sub-distribution feeders in the most demanding electrical environments.

Key Technical Advantages

• High Breaking Capacity (Icu): Available in various breaking levels (S, H, R) to handle fault currents up to 100kA, ensuring the safety of downstream assets during massive electrical surges.
• Specialized DC Versions for Solar: Specifically designed models for DC circuits (up to 1000V DC) featuring enhanced arc-quenching technology, ideal for PV combiner boxes and solar inverters.
• Thermal-Magnetic & Electronic Trip Units: Choose from fixed thermal-magnetic units for standard protection or adjustable electronic trip units for precise selective coordination in complex grids.
• Compact & Modular Design: Standardized frame sizes (125, 250, 400, 630, 800) allow for uniform panel layouts and simplified spare parts management.
• Environmentally Resilient: Built with high-strength, flame-retardant materials capable of operating in extreme temperatures ranging from -35°C to +70°C.

Technical Specifications

Primary Application Scenarios

1. Industrial Power Distribution: Main circuit protection for machining centers, assembly lines, and factory floor panels.
2. Commercial Buildings: Integrated into GGD or GCK switchgear for office towers, hotels, and shopping malls.
3. Solar PV Infrastructure: DC string protection and main DC disconnects for utility-scale solar farms and energy storage systems (BESS).
4. Infrastructure & Utilities: Reliable protection for water treatment plants, pumping stations, and telecommunication hubs.

Why Specify Chint MCCBs?

• Global Certification & Trust: Chint is one of the world’s largest manufacturers of low-voltage electrical components. Their MCCBs are fully certified to IEC/EN 60947-2, ensuring compliance with international safety codes.
• Versatile Accessory Range: All breakers can be equipped with auxiliary contacts, alarm contacts, shunt trips, undervoltage releases, and motorized operating mechanisms for remote control.
• Ease of Installation: Supports multiple wiring methods including front-of-board, back-of-board, and plug-in types to fit any cabinet configuration.
• Cost-Effective Reliability: Offers the same protection performance as premium European brands at a significantly better value point for large-scale projects.

FAQ

Q: Can I use the same MCCB for both AC and DC applications?

A: No. You must select the specific DC-rated version of the Chint MCCB for solar or battery applications. DC models include internal permanent magnets to extinguish the more persistent DC arcs.

Q: What is the difference between NM1 and NXM?

A: The NM1 is the classic, time-tested thermal-magnetic series. The NXM is the newer "Next Generation" series which offers higher breaking capacities and a more compact design for modern switchgear.

Q: Are these breakers suitable for motor protection?

A: Yes. We offer specialized motor protection versions of these MCCBs with modified tripping curves (Class 10/20) to handle the high inrush currents of industrial motors.

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