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nm8s-400s-4p-400a chint 400a 4p electronic adjustable thermal & magnetic mccb
Chint NM8S-400S-4P-400A 400A 4 pole electronic moulded case circuit breaker with adjustable electronic trip unit for industrial and commercial low voltage power distribution.
£384.00
Why Choose the Chint NM8S-400S-4P-400A Electronic MCCB?
The Chint NM8S-400S-4P-400A is a robust electronic moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection for low voltage electrical distribution systems. Featuring an adjustable electronic trip unit, it delivers accurate protection and improved system coordination for demanding industrial and commercial applications.
As part of the proven Chint NM8S Series, this MCCB is engineered for switchboards, main distribution panels and feeder circuits where reliable circuit protection and flexible adjustment are essential. The electronic release enables precise protection settings, helping reduce unnecessary downtime while safeguarding valuable electrical equipment.
With a 400A rated current, 4-pole configuration and 50kA breaking capacity, the NM8S-400S-4P-400A is ideal for three-phase electrical systems requiring neutral switching, making it suitable for commercial buildings, manufacturing facilities, utilities and infrastructure projects.
Key Advantages
- 400A rated current for industrial and commercial power distribution.
- 4-pole design suitable for three-phase systems with neutral switching.
- Adjustable electronic trip unit for accurate protection coordination.
- 50kA breaking capacity for dependable short-circuit interruption.
- Supports selective protection across complex electrical installations.
- Designed for long-term reliability in demanding low voltage applications.
Key Features
- Chint NM8S Series electronic moulded case circuit breaker.
- 400A rated current.
- 4-pole construction.
- Adjustable electronic protection.
- 50kA rated breaking capacity.
- Rated operational voltage up to 690V AC.
- Fixed mounting for electrical switchboards.
- Manufactured in accordance with IEC/EN 60947-2.
Reliable Protection for Three-Phase Power Distribution
The Chint NM8S-400S-4P-400A protects low voltage electrical installations by disconnecting circuits during overload and short-circuit fault conditions. Its adjustable electronic trip unit enables engineers to optimise protection settings for improved coordination throughout electrical distribution systems.
The 4-pole configuration provides simultaneous switching of all three phases and the neutral conductor, making it suitable for installations where complete isolation and enhanced system protection are required.
Typical Applications
- Industrial switchboards.
- Main and sub-distribution boards.
- Commercial electrical installations.
- Manufacturing and processing facilities.
- Infrastructure and utilities.
- High-capacity feeder circuit protection.
Technical Specifications
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| Trip Unit | LSI | |
|---|---|---|
| Mounting Type | Fixed | |
| Application | Power distribution | |
| Current | 400 A | |
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | MCCB | |
| Breaking Capacity | 50 kA | |
| Manufacturer | Chint | |
| Series | NM8S Electronic MCCB | |
| Model | NM8S-400S-4P-400A | |
| Product type | Electronic moulded case circuit breaker | |
| Rated current | 400A | |
| Frame size | 400S | |
| Number of poles | 4 Pole | |
| Trip unit | Adjustable electronic release | |
| Rated operational voltage | Up to 690V AC | |
| Rated insulation voltage | 800V | |
| Rated impulse withstand voltage | 8kV | |
| Breaking capacity | 50kA | |
| Frequency | 50 / 60Hz | |
| Mounting type | Fixed installation | |
| Protection functions | Overload and short-circuit protection | |
| Standard | IEC/EN 60947-2 |
Frequently Asked Questions
What is the Chint NM8S-400S-4P-400A used for?
It provides overload and short-circuit protection for industrial and commercial low voltage electrical distribution systems.
What is the rated current of this MCCB?
The NM8S-400S-4P-400A has a 400A rated current.
Why does this breaker have four poles?
The 4-pole configuration allows all three phases and the neutral conductor to be switched together, providing complete isolation where required.
What type of trip unit does this MCCB use?
This breaker uses an adjustable electronic trip unit that provides accurate and flexible protection settings.
Where is this breaker typically installed?
It is commonly installed in industrial switchboards, commercial distribution panels, infrastructure projects and high-capacity feeder circuits.
Trusted by Electrical Professionals Worldwide
Chint NM8S electronic MCCBs are trusted by panel builders, contractors and electrical engineers for dependable high-performance circuit protection, adjustable electronic trip settings and reliable long-term operation in demanding low voltage installations.
