Chint NM8-400S-4P-400A 400A 4 pole adjustable thermal-magnetic moulded case circuit breaker with 50 kA breaking capacity for industrial power distribution.
£978.51
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.
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.
| Current | 400 A |
|---|---|
| Phase | Three Phase |
| 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 |
It protects industrial and commercial electrical systems against overloads and short circuits while providing dependable switching and isolation.
The breaker has a rated current of 400 A.
This model features a 4 pole configuration, making it suitable for three-phase systems requiring neutral isolation.
Yes. It incorporates an adjustable thermal-magnetic trip unit, allowing protection settings to be matched to the installation.
The breaker is manufactured in accordance with IEC/EN 60947-2 for low-voltage moulded case circuit breakers.
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.
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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...