CHINT NM1-250S/250H Series 2P/3P/4P MCCB Circuit Breaker

Name: CHINT NM1-250S/250H Series 2P/3P/4P MCCB Circuit Breaker
Brand: CHINT
SKU: 1600687737041

Brand Name:Chint
Place of Origin:China
Model Number:NM1-250
Rated Frequency (Hz):50/60Hz
Breaking Capacity:20kA – 85kA
Rated Voltage:690V
Type:Moulded Case

Poles

Rated Current

Breaking Capacity (Icu @380V)

SKU: 1600687737041 Category: Others

Description

Chint original NM1 molded case circuit breaker is suitable for power distribution and for protecting circuits against overload, short-circuit, and under-voltage conditions. It can also be applied to infrequent motor starting and to motor overload, short-circuit, and under-voltage protection.

Electrical ratings: AC 690V, 50Hz/60Hz, 10A – 1250A.

Pole configuration shown on this page: 3 Pole / 4 Pole. Breaking capacity shown on this page: 25kA / 50kA / 65kA.

Technical Specifications

Parameter	Specification
Model Series	NM1
Type	Molded Case Circuit Breaker (MCCB)
Rated Frequency	50Hz / 60Hz
Rated Voltage	690V AC
Rated Current	10A – 1250A
Pole Configuration	3 Pole / 4 Pole
Breaking Capacity	25kA / 50kA / 65kA
Standard	IEC/EN 60947-2

Additional information

Weight	6 kg
Dimensions	22 × 22 × 22 cm
Rated Current	100A, 125A, 160A, 180A, 200A, 225A, 250A
Poles	3P, 4P

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NM1-250S/250H Series 2P/3P/4P MCCB Circuit Breaker.

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Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

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2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

Trip Unit Protection

How to choose between Thermal-Magnetic (TMD) and Electronic (Micrologic) trip units?

Thermal-magnetic trip units provide fixed or adjustable bimetallic overload and electromagnetic instantaneous short-circuit protection, ideal for standard industrial power distribution. Electronic microprocessor trip units offer precise digital dials for L (Long-time delay overload), S (Short-time delay short-circuit), I (Instantaneous short-circuit), and G (Ground-fault protection), delivering total time-current selectivity in modern switchgear.

Ics vs Icu Capacity

What is the technical distinction between Ultimate (Icu) and Service (Ics) breaking capacity?

Icu represents the absolute maximum fault current the breaker can safely interrupt, after which inspection or replacement may be needed. Ics represents the operational breaking capacity (50%, 75%, or 100% of Icu) that the breaker can clear repeatedly and remain fully operational without performance degradation. In critical healthcare, data center, and continuous industrial applications, specify breakers with Ics = 100% Icu.

3P vs 4P Neutral

When should a 4-Pole (4P) MCCB be specified instead of a standard 3-Pole (3P) MCCB?

A 4P breaker with a switched neutral is required in systems with dual power sources (generator / utility ATS transfer) to prevent circulating neutral currents, in IT distribution networks, and in commercial installations with heavy non-linear harmonic loads (LED drivers, variable speed drives) where neutral conductor current can exceed phase currents.

Motorized & Remote Operation

How to select manual rotary handles vs motorized electric operating mechanisms?

Direct or extended door rotary handles are specified when the MCCB is enclosed inside switchgear cubicles, providing padlocking and door-interlock safety. Motor operating mechanisms (electric operators) are required for automated SCADA control, remote PLC open/close operations, and automatic transfer switch (ATS) integration.

Terminal & Mounting Options

What terminal connection hardware and mounting configurations are available?

Standard front connection lugs accept copper or aluminum compression terminals and busbar connections. For high-density panel boards, extended spreader terminals, rear connection studs, and plug-in / draw-out base cassettes are available to facilitate rapid maintenance and modular swap-out.