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.
£853.33
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.
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.
| Current | 400 A |
|---|---|
| Phase | Three Phase |
| 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 |
It provides overload and short-circuit protection for industrial and commercial low voltage electrical distribution systems.
The NM8S-400S-4P-400A has a 400A rated current.
The 4-pole configuration allows all three phases and the neutral conductor to be switched together, providing complete isolation where required.
This breaker uses an adjustable electronic trip unit that provides accurate and flexible protection settings.
It is commonly installed in industrial switchboards, commercial distribution panels, infrastructure projects and high-capacity feeder circuits.
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.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...