Why Choose the ABB S203MT-Z20NA Miniature Circuit Breaker?
The ABB S203MT-Z20NA is a compact and dependable 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 specifically engineered for demanding industrial, traction and railway applications where reliable circuit protection and long service life are essential.
Featuring a Z curve tripping characteristic, the S203MT-Z20NA is ideal for sensitive electrical circuits that require rapid magnetic tripping under fault conditions. Its current limiting design minimises fault energy, helping protect cables, control equipment and connected devices while improving overall electrical safety.
With a rated current of 20 A and a 3-pole plus neutral configuration, the ABB S203MT-Z20NA is suitable for three-phase systems where the neutral conductor must switch together with the protected phases. Its modular DIN rail design enables straightforward installation within electrical distribution boards, switchgear assemblies and machine control panels.
Key Advantages
- Compact miniature circuit breaker for circuit protection.
- 20 A rated current for industrial and commercial circuits.
- 3-pole plus neutral configuration for three-phase systems.
- Z curve tripping characteristic for rapid fault clearance.
- 10 kA breaking capacity for dependable protection.
- DIN rail mounting for quick installation in electrical enclosures.
Key Features
- ABB S200MT miniature circuit breaker series.
- 20 A nominal current rating.
- 3 protected poles plus neutral.
- Z type tripping curve for sensitive circuits.
- Thermal overload protection.
- Electromechanical short-circuit protection.
- Current limiting class 3 performance.
- Compatible with ABB System pro M compact accessories.
Miniature circuit breakers such as the ABB S203MT-Z20NA automatically disconnect electrical circuits whenever overload or short-circuit faults occur. This helps prevent damage to cables, switchgear and connected equipment while improving the safety and reliability of electrical installations.
The Z curve characteristic provides extremely fast magnetic tripping at relatively low fault current levels, making the device particularly suitable for protecting sensitive electronic equipment, signalling systems, PLC control circuits and specialised industrial applications requiring rapid fault clearance.
Typical Applications
- Industrial automation and control panels.
- Railway and rolling stock electrical systems.
- Protection of sensitive electronic equipment.
- Distribution boards and switchgear assemblies.
- Machine building and OEM equipment.
- Commercial and industrial low-voltage installations.
