ABB S203M-Z50NA miniature circuit breaker from the System pro M compact S200M series, rated at 50 A with Z curve tripping characteristic and 3P+N configuration for sensitive low-voltage circuit protection.
£221.88
The ABB S203M-Z50NA is a high-performance miniature circuit breaker (MCB) designed to protect electrical circuits against overloads and short circuits. As part of the trusted ABB System pro M compact S200M series, this device provides dependable circuit protection for residential, commercial and industrial low-voltage installations.
This 50 amp Z-curve circuit breaker combines delayed thermal overload protection with electromechanical short-circuit tripping, helping to safeguard cables, equipment and sensitive electrical circuits. Its compact DIN rail design and current-limiting performance support safe, efficient installation inside modern distribution boards and control panels.
With a rated current of 50 A and a 3P+N configuration, the S203M-Z50NA is suitable for three-phase circuits requiring neutral switching. The Z tripping characteristic provides highly sensitive short-circuit protection, making it ideal for control circuits, electronic equipment and applications where fast fault detection is required.
Miniature circuit breakers such as the ABB S203M-Z50NA automatically disconnect a circuit when overload or short-circuit conditions occur. This helps protect wiring, connected equipment and electrical installations from damage caused by excessive current.
The Z curve characteristic provides fast and sensitive tripping performance, making this MCB suitable for applications where connected devices require enhanced protection. The S200M series is widely used by panel builders, contractors and industrial engineers who need reliable circuit protection in compact DIN rail assemblies.
| Current | 50 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-Z50NA |
| Product type | Miniature circuit breaker |
| Manufacturer part number | 2CDS273103R0578 |
| EAN | 4016779601610 |
| Rated current | 50 A |
| Tripping characteristic | Z curve |
| Number of poles | 3P+N |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Rated breaking capacity | 10 kA at 230/400 V AC |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 No. 235 |
| Degree of protection | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.47 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-Z50NA is used to protect low-voltage electrical circuits against overloads and short circuits, particularly where sensitive Z curve protection is required.
This miniature circuit breaker has a rated current of 50 A.
The Z curve tripping characteristic provides highly sensitive short-circuit protection, making it suitable for sensitive electronic equipment, control circuits and applications with low fault current requirements.
The S203M-Z50NA has a 3P+N configuration, making it suitable for three-phase circuits with neutral switching.
It is typically installed on DIN rail inside electrical distribution boards, control panels and industrial enclosures.
ABB System pro M compact miniature circuit breakers are widely used by panel builders, electrical contractors and industrial engineers for reliable circuit protection in modern low-voltage 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...