ABB S203P-Z50NA System pro M compact S200P miniature circuit breaker, a 4 pole 50 A Z curve MCB designed for sensitive circuit protection in commercial and industrial electrical installations.
The ABB S203P-Z50NA is a high performance 4 pole miniature circuit breaker (MCB) from the ABB System pro M compact S200P series. Designed for reliable circuit protection in commercial and industrial installations, it provides dependable overload and short circuit protection for three-phase electrical systems with neutral switching.
Featuring a Z tripping characteristic, the S203P-Z50NA is intended for applications requiring sensitive magnetic tripping and precise protection. It is especially useful where fast disconnection is needed for circuits with low fault currents or sensitive connected equipment.
With a 50 A rated current, 4 pole configuration and DIN rail mounting, the S203P-Z50NA provides a compact and professional protection solution for distribution boards, control panels and industrial electrical assemblies. Its current limiting design helps reduce fault energy and supports long term reliability in demanding installations.
Miniature circuit breakers such as the ABB S203P-Z50NA protect electrical installations by disconnecting circuits during overload or short circuit conditions. The thermal tripping mechanism responds to sustained overloads, while the magnetic tripping mechanism provides rapid disconnection during short circuit faults.
The Z characteristic offers a lower magnetic trip threshold than standard B, C, D or K curves, making it suitable for sensitive loads and applications where rapid response to relatively low fault currents is required. This makes the S203P-Z50NA a strong choice for specialist control circuits, electronic equipment protection and carefully designed industrial distribution systems.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-Z50NA |
| Product ID | 2CDS283103R0578 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 50 A |
| Poles | 4 pole |
| Protected poles | 3 |
| Trip characteristic | Z Curve |
| Rated voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Breaking capacity | Up to 25 kA |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.56 kg |
The ABB S203P-Z50NA is used to protect electrical circuits against overloads and short circuits in industrial, commercial and control panel applications.
A Z curve MCB provides sensitive magnetic tripping and is designed for circuits where fast disconnection is required at relatively low fault currents.
The S203P-Z50NA is a 4 pole miniature circuit breaker with three protected poles and neutral switching.
The ABB S203P-Z50NA has a rated current of 50 A.
Yes. The S203P-Z50NA is designed for installation on standard DIN rails in distribution boards, switchboards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted by electrical engineers, panel builders and OEM manufacturers for reliable circuit protection, compact installation and dependable 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...