ABB S203M-Z4 3-pole 4 A Z curve miniature circuit breaker from the System pro M compact S200M range, designed for sensitive circuit protection in industrial, commercial and control panel applications.
£150.84
The ABB S203M-Z4 is a high-quality 3-pole miniature circuit breaker (MCB) from the ABB System pro M compact S200M series. Designed for reliable overload and short circuit protection, it is suitable for industrial, commercial and OEM electrical installations where sensitive circuits require fast and dependable protection.
Featuring a Z tripping characteristic, the S203M-Z4 is particularly suited to sensitive electronic equipment, semiconductor protection, measuring circuits, PLC systems and automation control panels. The Z curve provides rapid magnetic tripping at low fault current levels, helping protect connected devices from damage.
With a 4 A rated current, 3-pole configuration and 10 kA breaking capacity, the ABB S203M-Z4 combines compact DIN rail installation with ABB's proven current limiting performance, reducing fault energy and supporting safe operation in demanding electrical systems.
Miniature circuit breakers such as the ABB S203M-Z4 protect electrical circuits by disconnecting the supply when overload or short circuit conditions occur. The thermal mechanism responds to sustained overloads, while the magnetic mechanism provides rapid disconnection during short circuit faults.
The Z curve characteristic is designed for applications requiring fast tripping at relatively low fault current levels, making this MCB ideal for sensitive electronics, instrumentation, control circuits and semiconductor protection. Its 3-pole format supports three-phase circuit protection within a compact DIN rail mounted design.
| Current | 4 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-Z4 |
| Manufacturer Part Number | 2CDS273001R0378 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 4 A |
| Number of poles | 3P |
| Tripping characteristic | Z |
| Rated operational voltage | Up to 440 V AC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Bi-directional cylinder-lift terminal |
| Operating temperature | -25 to +55 °C |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.375 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-Z4 is used to protect electrical circuits against overloads and short circuits, especially sensitive control and electronic circuits requiring fast tripping behaviour.
The S203M-Z4 has a 4 A rated current.
The Z curve provides rapid magnetic tripping at low fault current levels, making it suitable for sensitive electronic equipment, control circuits and semiconductor protection.
The ABB S203M-Z4 is a 3-pole miniature circuit breaker, suitable for three-phase circuit protection.
The S203M-Z4 provides a 10 kA breaking capacity, supporting reliable short circuit protection in professional electrical installations.
ABB System pro M compact S200M miniature circuit breakers are trusted by panel builders, electrical contractors and automation engineers for reliable protection, compact installation and proven performance in demanding electrical 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...