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nm8-400s-3p-400a chint 400a 3p adjustable thermal & magnetic mccb
Chint NM8-400S-3P-400A 400A 3 pole adjustable thermal-magnetic moulded case circuit breaker with 50 kA breaking capacity for industrial power distribution.
Why Choose the Chint NM8-400S-3P-400A Moulded Case Circuit Breaker?
The Chint NM8-400S-3P-400A is a heavy-duty 3 pole moulded case circuit breaker (MCCB) engineered to provide reliable overload and short-circuit protection for industrial power distribution systems. As part of the dependable Chint NM8 Series, it combines robust construction with adjustable thermal-magnetic protection, making it ideal for demanding commercial and industrial applications.
Designed for use in switchboards, distribution panels and motor control systems, the NM8-400S delivers dependable protection while maintaining operational continuity. Its adjustable trip settings allow engineers to optimise protection for individual installations, helping minimise unnecessary downtime and improve system reliability.
With a 400 A rated current, 3 pole configuration and a 50 kA breaking capacity, the NM8-400S-3P-400A is suitable for protecting larger low-voltage electrical installations where dependable performance and safe isolation are essential.
Key Advantages
- Industrial-grade 3 pole moulded case circuit breaker.
- 400 A rated current for heavy-duty power distribution.
- Adjustable thermal-magnetic trip unit for flexible protection.
- 50 kA breaking capacity for reliable fault interruption.
- Suitable for switching, isolation and circuit protection.
- Designed for long service life in demanding industrial environments.
Key Features
- Chint NM8 Series MCCB.
- 400 A rated current.
- 3 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 equipment.
Reliable Circuit Protection for Industrial Installations
The Chint NM8 Series is designed to safeguard low-voltage electrical systems against overloads and short circuits while providing dependable switching and isolation. The adjustable thermal-magnetic release enables the breaker to be configured for the protection requirements of a wide range of industrial applications.
Suitable for manufacturing facilities, commercial buildings, utilities and electrical infrastructure projects, the NM8-400S delivers reliable circuit protection where equipment safety and operational continuity are critical.
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 | 3-pole | |
| Device Type | MCCB | |
| Breaking Capacity | 50 kA | |
| Trip Unit | Thermal-magnetic | |
| Manufacturer | Chint | |
| Series | NM8 | |
| Model | NM8-400S-3P-400A | |
| Product type | Moulded Case Circuit Breaker (MCCB) | |
| Rated current | 400 A | |
| Number of poles | 3 | |
| 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-3P-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 3 pole configuration for three-phase electrical systems.
Does this breaker have adjustable protection?
Yes. It incorporates an adjustable thermal-magnetic trip unit, allowing protection settings to be tailored to the application.
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.
