ABB S203MT-Z10NA miniature circuit breaker, a 10 A 3-pole plus neutral Z curve MCB from the ABB S200MT range for overload and short-circuit protection in low-voltage electrical installations.
£246.21
The ABB S203MT-Z10NA is a compact and reliable miniature circuit breaker (MCB) designed to provide overload and short-circuit protection in low-voltage electrical installations. As part of the ABB S200MT miniature circuit breaker range, it is engineered for demanding industrial, traction and railway applications where dependable protection, compact installation and fast fault response are essential.
This circuit breaker features a Z curve tripping characteristic, making it suitable for sensitive electrical circuits that require rapid disconnection under short-circuit conditions. Its current limiting design helps reduce fault energy, supporting safer operation and improved protection for cables, control equipment and connected loads.
With a rated current of 10 A and a 3-pole plus neutral configuration, the ABB S203MT-Z10NA is ideal for three-phase circuits where the neutral conductor must switch together with the protected phases. Its DIN rail mounting design enables straightforward installation inside electrical panels, distribution boards, switchgear cabinets and machinery enclosures.
Miniature circuit breakers such as the ABB S203MT-Z10NA protect electrical circuits by automatically disconnecting the supply when overload or short-circuit faults occur. This helps prevent cable damage, equipment failure and unsafe fault conditions in control and distribution systems.
The Z curve characteristic provides rapid magnetic tripping at lower short-circuit current levels than standard MCB curves, making this device suitable for sensitive electrical loads, control circuits and specialised equipment that require fast fault clearance. Its 3-pole plus neutral layout also supports installations where the neutral conductor must switch with the protected phases.
| Current | 10 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z10NA |
| Order code | 2CDS273106R0428 |
| Product type | Miniature circuit breaker |
| Rated current | 10 A |
| Number of poles | 3 protected poles + neutral |
| Total pole configuration | 4 pole |
| Tripping characteristic | Z curve |
| Rated voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Current limiting class | Class 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Built-in depth | approx. 69 mm |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203MT-Z10NA is used to protect low-voltage electrical circuits against overloads and short circuits, particularly in control panels, distribution boards, railway systems and sensitive electrical installations.
This miniature circuit breaker has a rated current of approximately 10 A.
It means the device has three protected poles for phase conductors and an additional neutral pole that switches with the circuit.
The Z curve provides rapid tripping at lower short-circuit current levels, making it suitable for sensitive circuits and equipment that require fast disconnection.
The ABB S203MT-Z10NA is typically installed on DIN rail inside electrical control panels, distribution boards, switchgear cabinets and machinery enclosures.
ABB S200MT miniature circuit breakers are widely used by panel builders, railway system engineers and electrical installers to deliver 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...