ABB S203MT-C40 miniature circuit breaker, a 3-pole 40 A C curve MCB from the S200MT range with 10 kA breaking capacity for traction, railway and industrial circuit protection.
£144.40
The ABB S203MT-C40 is a high-performance 3-pole miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection in demanding electrical installations. Part of the specialist ABB S200MT range, it is developed for traction, railway and industrial applications where dependable modular protection is essential.
With a C tripping characteristic, the S203MT-C40 is suitable for general-purpose circuits with moderate inrush currents. This makes it a practical choice for distribution boards, control panels, machine circuits and industrial electrical systems requiring consistent and reliable protection.
Rated at 40 A with a 3-pole configuration and 10 kA short-circuit breaking capacity, the ABB S203MT-C40 provides robust circuit protection in a compact DIN rail format. Its current-limiting design helps reduce fault energy and supports safe operation in demanding environments.
Miniature circuit breakers such as the ABB S203MT-C40 automatically disconnect electrical circuits when excessive current is detected. The delayed thermal tripping mechanism provides overload protection, while the electromechanical tripping mechanism responds rapidly to short-circuit faults.
The S200MT range is designed for demanding transport and industrial environments. Its current-limiting performance, robust construction and compatibility with ABB modular accessories make the S203MT-C40 a dependable choice for panel builders, railway engineers and industrial electrical contractors.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-C40 |
| Product ID | 2CDS273445R0404 |
| EAN | 4016779124065 |
| Product type | Miniature circuit breaker |
| Number of poles | 3P |
| Protected poles | 3 |
| Rated current | 40 A |
| Tripping characteristic | C curve |
| Rated short-circuit capacity | 10 kA |
| Rated operational voltage | 400 V AC |
| Maximum operational voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Pollution degree | 3 |
| Overvoltage category | III |
| Mounting type | DIN rail |
| Width | 3 modules |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203MT-C40 is used to protect three-phase electrical circuits against overloads and short circuits in traction, railway, industrial and commercial installations.
The S203MT-C40 has a rated current of 40 A.
This miniature circuit breaker has a 3-pole configuration with three protected poles.
The C curve tripping characteristic is designed for circuits with moderate inrush currents, making it suitable for general distribution, control panel and industrial applications.
It is typically installed on a DIN rail inside distribution boards, control panels, switchboards or industrial electrical enclosures.
ABB S200MT miniature circuit breakers are trusted by railway engineers, panel builders and electrical contractors for reliable modular circuit protection in demanding industrial and transport applications.
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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...