ABB S203MT-Z8NA miniature circuit breaker, an 8 A 3-pole plus neutral Z curve MCB from the ABB S200MT range for industrial, traction and railway applications.
£283.12
The ABB S203MT-Z8NA is a high-performance miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection in low-voltage electrical installations. As part of the ABB S200MT miniature circuit breaker range, it is specifically developed for demanding industrial, traction and railway applications where reliable circuit protection and long service life are essential.
This circuit breaker features a Z curve tripping characteristic, making it ideal for sensitive electrical circuits that require rapid disconnection under fault conditions. Its advanced current limiting design helps minimise fault energy, protecting cables, control equipment and connected devices while improving electrical safety.
With a rated current of 8 A and a 3-pole plus neutral configuration, the ABB S203MT-Z8NA is suitable for protecting three-phase circuits where the neutral conductor must switch simultaneously with the protected phases. Its DIN rail mounting format enables fast and secure installation within control panels, distribution boards and switchgear assemblies.
The ABB S203MT-Z8NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping prevent damage to wiring, switchgear and connected equipment. Its current limiting technology reduces the thermal and mechanical stresses created during fault conditions.
The Z curve characteristic provides rapid magnetic tripping at relatively low fault current levels, making the device particularly suitable for protecting sensitive electronic equipment, signalling systems, control circuits and specialised industrial applications requiring fast fault clearance.
| Current | 8 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z8NA |
| Manufacturer part number | 2CDS273106R0408 |
| Product type | Miniature circuit breaker |
| Rated current | 8 A |
| Number of poles | 3 protected poles + neutral |
| Total pole configuration | 4 pole |
| Tripping characteristic | Z curve |
| Rated operational voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.46 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203MT-Z8NA provides overload and short-circuit protection for three-phase electrical circuits, particularly those supplying sensitive electronic and control equipment.
The ABB S203MT-Z8NA has a rated current of 8 A.
The Z curve provides very fast magnetic tripping, making it suitable for sensitive circuits where rapid disconnection during fault conditions is essential.
It features three protected poles together with a switched neutral, providing a 3P+N configuration for three-phase systems.
It is commonly installed on DIN rail inside control panels, distribution boards, switchgear assemblies and railway electrical equipment.
ABB S200MT miniature circuit breakers are trusted by panel builders, railway engineers and industrial electricians for dependable circuit protection in demanding low-voltage applications.
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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...