ABB S203-Z50NA miniature circuit breaker with 50 A rated current, Z trip characteristic and 3 protected poles plus neutral for sensitive industrial and commercial circuit protection.
£255.49
The ABB S203-Z50NA is a high-quality 3-pole + neutral miniature circuit breaker (MCB) from the proven ABB System pro M compact S200 series. Designed for overload and short circuit protection, it is suitable for industrial control panels, commercial distribution boards, automation systems and electrical installations requiring sensitive and reliable circuit protection.
Featuring a Z trip characteristic, the S203-Z50NA is designed for circuits with low inrush currents and applications where fast magnetic tripping is required. It is particularly suited to protecting PLCs, instrumentation, electronic control equipment, semiconductor circuits and other sensitive electrical loads.
With a 50 A rated current, 3 protected poles plus neutral and a compact DIN rail mounted format, the ABB S203-Z50NA offers straightforward installation, current limiting performance and compatibility with ABB System pro M compact accessories including auxiliary contacts, shunt trips and undervoltage releases.
The ABB S203-Z50NA uses thermal magnetic trip technology to protect circuits against overloads and short circuits. The delayed thermal tripping mechanism responds to sustained overload conditions, while the electromechanical magnetic trip reacts rapidly to short circuit fault currents.
The Z curve makes this miniature circuit breaker especially useful where sensitive equipment requires rapid disconnection at relatively low fault currents. As part of ABB's System pro M compact range, it provides dependable current limiting performance, robust construction and long service life in demanding electrical installations.
| Current | 50 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200 |
| Model | S203-Z50NA |
| Product ID | 2CDS253103R0578 |
| EAN | 4016779552141 |
| Product type | Miniature circuit breaker / supplementary protector |
| Rated current | 50 A |
| Tripping characteristic | Z |
| Poles | 3 protected poles + neutral |
| Total number of poles | 4 |
| Rated operational voltage | Up to 480Y/277 V AC |
| Rated AC voltage | 400 V AC |
| Rated DC voltage | 110 V DC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | Up to 6 kA |
| Current limiting class | 3 |
| Protection | Thermal magnetic |
| Mounting type | DIN rail |
| Terminal type | Finger-safe terminals |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.47 kg |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203-Z50NA is used to provide overload and short circuit protection for sensitive electronic circuits, automation equipment, control panels and commercial electrical installations.
The Z characteristic provides fast tripping at relatively low fault currents, making it suitable for sensitive electronics, PLCs, instrumentation and semiconductor circuits.
The S203-Z50NA features 3 protected poles plus a neutral pole, making it suitable for three-phase systems with neutral.
The ABB S203-Z50NA has a 50 A rated current.
Yes. The ABB S203-Z50NA is designed for secure installation on standard DIN rails used in control panels and distribution boards.
ABB System pro M compact miniature circuit breakers are trusted by panel builders, electrical contractors and OEM manufacturers for reliable circuit protection, current limiting performance and long service life.
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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...