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NM8N Moulded Case Circuit Breaker
NM8N-125S 4P-MCCB-1
NM8N-125S 4P-MCCB-3
NM8N-1600S 4P-MCCB-1
NM8N-1600S 4P-MCCB-5
NM8N-250S 4P-MCCB-1
NM8N-630S 4P-MCCB-2
NM8N-800S 4P-MCCB-5
NM8N-630S 4P-MCCB-5
NM8N-630S 4P-MCCB-6
NM8N-125S 4P-MCCB-1
NM8N-125S 4P-MCCB-3
NM8N-1600S 4P-MCCB-1
NM8N-1600S 4P-MCCB-5
NM8N-250S 4P-MCCB-1
NM8N-630S 4P-MCCB-2
NM8N-800S 4P-MCCB-5
NM8N-630S 4P-MCCB-5
NM8N-630S 4P-MCCB-6

NM8N Moulded Case Circuit Breaker

The NM8N Moulded Case Circuit Breaker (MCCB) is designed for AC and DC low-voltage distribution systems, providing protection against overload, short-circuit, and undervoltage faults.It also supports motor protection, isolation, and residual current protection, making it suitable for a wide range of industrial and commercial applications.

 

The breaker can be installed vertically or horizontally, with both top and bottom line entry options.

Product Information

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FAQs

 

Under what circumstances should I use the NM8N Moulded Case Circuit Breaker?

The NM8N MCCB is ideal for low-voltage distribution systems (AC ≤690V or DC ≤1000V) that require protection against overload, short-circuit, and undervoltage faults. It is suitable for industrial plants, commercial buildings, data centers, and renewable energy systems — especially where high reliability and compact installation are critical.

 

Can the NM8N MCCB be used in DC systems or solar energy applications?

Yes. Certain NM8N variants support DC circuits up to 1000V, making them suitable for solar PV combiner boxes, energy storage systems, and DC distribution panels. Always select the DC-rated version and verify the polarity connection according to CHINT’s installation guidelines.

 

What are the advantages of choosing an electronic trip unit (EN or EM type) instead of a thermal-magnetic one?

Electronic trip units provide greater accuracy and adjustability. They allow users to fine-tune protection parameters such as long-time, short-time, and instantaneous trips, as well as earth fault detection (EM models). This is especially useful for critical loads or selective coordination in complex networks.

 

Can the NM8N MCCB operate in harsh or outdoor environments?

Yes. The breaker is rated for operation from −40°C to +70°C, with IP40 protection and durable thermoset housing. It’s suitable for both indoor switchboards and semi-outdoor environments (when installed in a protected enclosure). For higher humidity or dust exposure, using sealed terminal covers or dust-proof accessories is recommended.

 

What installation options are available for the NM8N series?

The NM8N MCCB offers flexible mounting configurations — it can be installed in fixed, plug-in, or withdrawable versions, with front or rear connections, and in vertical or horizontal orientations. This versatility makes it adaptable for panel builders, OEMs, and retrofit upgrades where space and layout vary.