Chint NM8-125S-4P-40A moulded case circuit breaker with 40A rated current, 4-pole configuration, adjustable thermal magnetic protection and 50kA breaking capacity for low-voltage electrical distribution.
£224.09
The Chint NM8-125S-4P-40A is a dependable moulded case circuit breaker (MCCB) designed to provide reliable overload and short circuit protection for low-voltage electrical distribution systems. As part of the Chint NM8 series, it delivers robust circuit protection for commercial, industrial and panel-building applications where safe isolation and dependable operation are essential.
This MCCB features adjustable thermal magnetic protection, combining thermal overload protection with magnetic short circuit protection. The adjustable overload setting allows engineers and panel builders to coordinate protection with cable ratings, connected loads and downstream equipment, helping improve installation flexibility and system reliability.
With a 40 A rated current, 4-pole configuration and 50 kA breaking capacity, the NM8-125S-4P-40A is suitable for three-phase systems with neutral, distribution boards, industrial switchboards, machinery supplies and commercial electrical installations requiring dependable MCCB protection.
Moulded case circuit breakers such as the Chint NM8-125S-4P-40A protect cables, switchgear and connected equipment by disconnecting circuits during overload or short circuit conditions. This helps reduce the risk of electrical damage and supports safer operation across low-voltage installations.
The NM8 range is widely used in distribution panels, control systems and machinery applications where adjustable protection, high breaking capacity and straightforward installation are required.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | Chint |
| Series | NM8 |
| Model | NM8-125S-4P-40A |
| Product type | Moulded Case Circuit Breaker (MCCB) |
| Rated current | 40 A |
| Number of poles | 4 Pole |
| Trip unit | Adjustable thermal magnetic |
| Breaking capacity | 50 kA |
| Rated operational voltage | Up to 690 V AC |
| Rated insulation voltage | 800 V |
| Rated impulse withstand voltage | 8 kV |
| Frequency | 50 / 60 Hz |
| Protection functions | Overload and short circuit protection |
| Mounting type | Panel / switchboard mounting |
| Standard | IEC/EN 60947-2 |
It is used to protect low-voltage electrical circuits against overloads and short circuits in commercial, industrial and machinery applications.
The NM8-125S-4P-40A has a 40 A rated current.
This model has a 4-pole configuration, making it suitable for three-phase systems with neutral.
The Chint NM8-125S-4P-40A provides a 50 kA short circuit breaking capacity.
It uses an adjustable thermal magnetic trip unit to provide overload and short circuit protection.
Chint NM8 moulded case circuit breakers are used by panel builders, contractors and maintenance engineers to provide dependable low-voltage circuit protection across commercial and industrial 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...