ABB S203M-D63NA miniature circuit breaker, a 63 A 3P+N D curve MCB from the System pro M Compact S200M series for industrial and commercial circuit protection.
£486.70
The ABB S203M-D63NA is a robust and reliable miniature circuit breaker (MCB) from the ABB System pro M Compact S200M series, designed to provide dependable overload and short circuit protection in industrial, commercial and specialist electrical installations. With its D characteristic trip curve, it is particularly suited to circuits with high inrush currents.
This miniature circuit breaker uses a delayed thermal tripping mechanism for overload protection and an electromechanical tripping mechanism for short circuit protection. The S200M series is designed for high reliability, compact installation and compatibility with ABB modular DIN rail accessories.
With a rated current of 63 A, a 3P+N configuration and a 10 kA breaking capacity, the S203M-D63NA is ideal for protecting three-phase circuits with neutral switching in control panels, machinery, distribution boards and automation systems.
Miniature circuit breakers such as the ABB S203M-D63NA protect electrical circuits by disconnecting the supply when overloads or short circuits occur. The thermal trip responds to sustained overloads, while the electromechanical trip reacts rapidly to short circuit faults.
The D curve characteristic is designed for applications where higher starting currents are expected, such as motors, transformers and inductive loads. This helps reduce unwanted tripping while maintaining safe and effective protection for downstream equipment.
| Current | 63 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M Compact S200M |
| Model | S203M-D63NA |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 63 A |
| Number of protected poles | 3 |
| Neutral pole | Switched neutral |
| Pole configuration | 3P+N |
| Trip characteristic | D |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| Width | 4 modular spacings |
| Built-in depth | approx. 69 mm |
It is used to provide overload and short circuit protection for three-phase circuits, particularly where neutral switching and high inrush current tolerance are required.
The D curve is designed for circuits with high inrush currents, such as motors, transformers and other inductive loads.
The ABB S203M-D63NA has a rated current of 63 A.
3P+N means the device has three protected poles for the phase conductors and a switched neutral pole.
It is designed for DIN rail mounting inside electrical distribution boards, control panels and industrial enclosures.
ABB System pro M Compact miniature circuit breakers are widely used by electrical contractors, panel builders and machine manufacturers for dependable protection in demanding industrial and commercial 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...