ABB S203P-Z50 three-pole 50 A miniature circuit breaker with Z tripping characteristic for sensitive industrial and commercial electrical circuit protection.
The ABB S203P-Z50 is a high performance three-pole miniature circuit breaker (MCB) from the trusted ABB System pro M compact S200P series. Designed for dependable overload and short circuit protection, it is ideal for industrial control panels, commercial distribution boards, automation systems and sensitive electrical circuits requiring exceptionally fast fault response.
Featuring a Z tripping characteristic, the S203P-Z50 is specifically designed for circuits where rapid magnetic tripping is essential, making it suitable for protecting PLCs, instrumentation, semiconductor equipment, electronic control systems and other sensitive loads. Its delayed thermal trip mechanism protects against overloads, while its electromechanical trip mechanism provides rapid disconnection during short circuit conditions.
With a 50 A rated current, three-pole configuration and breaking capacity of up to 25 kA at 230 / 400 V AC, the ABB S203P-Z50 provides dependable circuit protection for demanding industrial and commercial installations. Its compact DIN rail mounted design enables straightforward installation alongside ABB modular accessories.
Miniature circuit breakers such as the ABB S203P-Z50 automatically disconnect electrical circuits during overload or short circuit conditions, helping protect wiring, electrical equipment and sensitive control systems from damage caused by excessive current.
The Z characteristic provides an extremely fast magnetic response, making this breaker ideal for PLCs, instrumentation, semiconductor devices and electronic control equipment where rapid fault clearance is essential. Its robust construction and compatibility with ABB modular accessories make it an excellent choice for panel builders, OEM machine manufacturers and industrial electrical engineers.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-Z50 |
| Product ID | 2CDS283001R0578 |
| EAN | 4016779593878 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 50 A |
| Number of poles | 3 |
| Number of protected poles | 3 |
| Tripping characteristic | Z |
| Rated operational voltage | 400 V AC |
| Maximum operating voltage | 480Y / 277 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Breaking capacity | Up to 25 kA at 230 / 400 V AC |
| Rated service short circuit breaking capacity | 7.5 kA at 400 V AC |
| Rated ultimate short circuit breaking capacity | 15 kA at 400 V AC |
| Energy limiting class | 3 |
| Terminal type | Screw terminals |
| Mounting type | DIN rail |
| Protection rating | IP20 terminals, IP40 when installed in an enclosure |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.42 kg |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 |
The S203P-Z50 protects three-phase electrical circuits against overloads and short circuits, particularly where sensitive equipment requires rapid fault protection.
The Z curve provides very fast magnetic tripping, making it suitable for sensitive electronic equipment, PLCs, semiconductor devices and control circuits.
The ABB S203P-Z50 has a 50 A rated current.
The S203P-Z50 is a three-pole miniature circuit breaker.
The breaker is designed for installation onto standard DIN rails inside electrical control panels, switchboards and distribution boards.
ABB System pro M compact miniature circuit breakers are trusted worldwide by panel builders, OEM manufacturers and industrial engineers for dependable circuit protection, high quality construction and long service life.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...