ABB S203M-Z20 three-pole 20 A miniature circuit breaker with Z tripping characteristic for protecting sensitive industrial and commercial electrical circuits.
£144.60
The ABB S203M-Z20 is a high performance three-pole miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in industrial and commercial electrical installations. As part of the trusted ABB S200M series, this MCB combines advanced protection technology with robust construction to ensure reliable circuit protection in demanding environments.
Featuring a Z tripping characteristic, the S203M-Z20 is particularly suited to protecting highly sensitive circuits with very low inrush currents, making it ideal for electronic equipment, control circuits, PLC systems and instrumentation. Its current limiting design helps reduce fault energy, protecting both equipment and wiring while improving system safety.
With a 20 A current rating, three protected poles and a 6 kA breaking capacity, the ABB S203M-Z20 delivers reliable performance across a wide range of industrial control panels, automation systems and electrical distribution applications. The compact DIN rail mounting design allows fast installation inside switchboards and distribution cabinets.
The ABB S203M-Z20 protects electrical circuits by automatically disconnecting the supply during overload or short circuit conditions. Its advanced thermal and magnetic trip mechanisms provide rapid fault detection while reducing stress on connected equipment and electrical installations.
The Z characteristic is specifically intended for applications with highly sensitive electronic equipment where rapid magnetic tripping is required. This makes the S203M-Z20 an excellent choice for industrial automation, instrumentation and specialist control systems.
| Current | 20 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | S200M |
| Model | S203M-Z20 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 20 A |
| Number of poles | 3P |
| Tripping characteristic | Z |
| Rated operational voltage | Up to 440 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated short-circuit breaking capacity | 6 kA |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077 |
| Protection rating | IP20 (IP40 when installed in enclosure) |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | Approx. 0.345 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-Z20 protects three-phase electrical circuits against overloads and short circuits, particularly where sensitive electronic equipment requires a Z characteristic circuit breaker.
A Z characteristic MCB trips very quickly under short circuit conditions and is designed for protecting sensitive electronic devices and control circuits with low inrush currents.
This model is a three-pole (3P) miniature circuit breaker designed for three-phase electrical systems.
The ABB S203M-Z20 has a 20 A rated current.
The breaker is designed for quick installation onto standard DIN rails inside electrical distribution boards and industrial control panels.
ABB S200M miniature circuit breakers are trusted by electrical contractors, panel builders and industrial engineers for delivering dependable circuit protection, consistent performance and long service life in demanding 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...