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nm8-400s-4p-400a chint 400a 4p adjustable thermal & magnetic mccb
Chint NM8-400S-4P-400A 400A 4 pole adjustable thermal-magnetic moulded case circuit breaker with 50 kA breaking capacity for industrial power distribution.
Why Choose the Chint NM8-400S-4P-400A Moulded Case Circuit Breaker?
The Chint NM8-400S-4P-400A is a heavy-duty 4 pole moulded case circuit breaker (MCCB) designed to provide reliable overload and short-circuit protection for industrial, commercial and power distribution systems. As part of the dependable Chint NM8 Series, it combines robust construction with adjustable thermal-magnetic protection for demanding low-voltage installations.
Designed for switchboards, distribution panels and electrical control systems, the NM8-400S delivers dependable protection while supporting safe switching and isolation. Its adjustable trip characteristics allow engineers to match the protection settings to the needs of the installation, helping improve system reliability and reduce unnecessary downtime.
With a 400 A rated current, 4 pole configuration and a 50 kA breaking capacity, the NM8-400S-4P-400A is ideal for larger three-phase electrical systems requiring dependable fault protection, neutral isolation and long service life.
Key Advantages
- Heavy-duty 4 pole moulded case circuit breaker.
- 400 A rated current for large power distribution systems.
- Adjustable thermal and magnetic protection for application flexibility.
- 50 kA short-circuit breaking capacity for reliable fault interruption.
- Suitable for switching, isolation and circuit protection.
- Designed for dependable operation in demanding industrial environments.
Key Features
- Chint NM8 Series MCCB.
- 400 A rated current.
- 4 pole configuration.
- Adjustable thermal-magnetic trip unit.
- 50 kA rated breaking capacity.
- Rated operational voltage up to 690 V AC.
- Suitable for isolation in accordance with IEC requirements.
- Fixed mounting for switchgear and distribution panels.
Reliable Circuit Protection for Industrial Installations
The Chint NM8 Series is engineered to protect low-voltage electrical systems against overloads and short circuits while providing dependable switching and safe isolation. Its adjustable thermal-magnetic release enables protection settings to be configured for a wide range of industrial and commercial applications.
Suitable for manufacturing facilities, infrastructure projects, utilities and large commercial buildings, the NM8-400S provides reliable circuit protection where equipment safety and operational continuity are essential.
Typical Applications
- Main incoming distribution boards.
- Industrial switchgear assemblies.
- Motor control centres.
- Commercial electrical installations.
- Manufacturing and processing plants.
- Power distribution infrastructure.
Technical Specifications
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| Mounting Type | Fixed | |
|---|---|---|
| Application | Power distribution | |
| Current | 400 A | |
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | MCCB | |
| Breaking Capacity | 50 kA | |
| Trip Unit | Thermal-magnetic | |
| Manufacturer | Chint | |
| Series | NM8 | |
| Model | NM8-400S-4P-400A | |
| Product type | Moulded Case Circuit Breaker (MCCB) | |
| Rated current | 400 A | |
| Number of poles | 4 | |
| Trip unit | Adjustable thermal-magnetic | |
| Rated operational voltage | Up to 690 V AC | |
| Rated insulation voltage (Ui) | 800 V | |
| Rated impulse withstand voltage (Uimp) | 8 kV | |
| Breaking capacity | 50 kA | |
| Rated frequency | 50 / 60 Hz | |
| Standard | IEC/EN 60947-2 | |
| Mounting type | Fixed | |
| Frame size | NM8-400S |
Frequently Asked Questions
What is the Chint NM8-400S-4P-400A used for?
It protects industrial and commercial electrical systems against overloads and short circuits while providing dependable switching and isolation.
What is the rated current of this MCCB?
The breaker has a rated current of 400 A.
How many poles does this circuit breaker have?
This model features a 4 pole configuration, making it suitable for three-phase systems requiring neutral isolation.
Does this breaker have adjustable protection?
Yes. It incorporates an adjustable thermal-magnetic trip unit, allowing protection settings to be matched to the installation.
Which standards does the NM8-400S comply with?
The breaker is manufactured in accordance with IEC/EN 60947-2 for low-voltage moulded case circuit breakers.
Trusted by Electrical Professionals Worldwide
Chint NM8 moulded case circuit breakers are widely used by panel builders, electrical contractors and industrial engineers to provide dependable protection for low-voltage power distribution systems.
