Chint NM8-400S-3P-400A 400A 3 pole adjustable thermal-magnetic moulded case circuit breaker with 50 kA breaking capacity for industrial power distribution.
£718.79
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.
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.
| Current | 400 A |
|---|---|
| Phase | Three Phase |
| 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 |
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 3 pole configuration for three-phase electrical systems.
Yes. It incorporates an adjustable thermal-magnetic trip unit, allowing protection settings to be tailored to the application.
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...