Why Choose the ABB S203MT-Z16NA Miniature Circuit Breaker?
The ABB S203MT-Z16NA 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 developed for demanding industrial, traction and railway applications where reliable 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 where rapid disconnection is required during 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 16 A and a 3-pole plus neutral configuration, the ABB S203MT-Z16NA is ideal for three-phase systems where the neutral conductor must switch together with the protected phases. Its DIN rail mounting design allows straightforward installation inside control panels, distribution boards, switchgear cabinets and machinery enclosures.
Key Advantages
- Compact miniature circuit breaker for circuit protection.
- 16 A rated current for low-voltage electrical circuits.
- 3-pole plus neutral configuration for three-phase systems with switched neutral.
- Z curve tripping characteristic for rapid short-circuit response.
- 10 kA breaking capacity for dependable fault protection.
- DIN rail mounting for fast installation in electrical enclosures.
Key Features
- ABB S200MT miniature circuit breaker series.
- 16 A nominal current rating.
- 3 protected poles plus neutral.
- Z type tripping curve for sensitive circuit protection.
- Thermal tripping mechanism for overload protection.
- Electromechanical tripping mechanism for short-circuit protection.
- Current limiting class 3 performance.
- Compatible with ABB System pro M compact accessories.
Miniature circuit breakers such as the ABB S203MT-Z16NA 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 applications where the neutral conductor must switch together with the protected phases.
Typical Applications
- Industrial control panels and automation systems.
- Railway and traction electrical installations.
- Three-phase circuits requiring switched neutral protection.
- Distribution boards and switchgear assemblies.
- Protection of sensitive electronic equipment.
- Machine building and OEM electrical systems.
