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ABB S203MT-Z25NA MCB – S200M – 3P+N – Z – 25A
ABB S203MT-Z25NA miniature circuit breaker, a 25 A 3-pole plus neutral Z curve MCB from the ABB S200MT range for industrial, traction and railway applications.
Why Choose the ABB S203MT-Z25NA Miniature Circuit Breaker?
The ABB S203MT-Z25NA is a compact and 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 has been specifically developed 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-Z25NA is ideally suited to sensitive electrical circuits requiring rapid magnetic tripping during fault conditions. Its advanced current limiting design reduces fault energy, helping to protect cables, control equipment and connected electrical devices while improving overall system safety.
With a rated current of 25 A and a 3-pole plus neutral configuration, the ABB S203MT-Z25NA is ideal for protecting three-phase systems where the neutral conductor must switch together with the protected phases. Its DIN rail mounting format enables quick installation inside control panels, distribution boards and switchgear assemblies.
Key Advantages
- Compact miniature circuit breaker for circuit protection.
- 25 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 short-circuit protection.
- DIN rail mounting for quick installation in electrical enclosures.
Key Features
- ABB S200MT miniature circuit breaker series.
- 25 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.
Reliable Circuit Protection for Sensitive Applications
Miniature circuit breakers such as the ABB S203MT-Z25NA automatically disconnect electrical circuits whenever overload or short-circuit faults occur. This helps prevent damage to wiring, switchgear and connected equipment while improving the safety and reliability of electrical installations.
The Z curve characteristic provides very 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.
Technical Specifications
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| Current | 25 A | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | Z curve | |
| Breaking Capacity | 10 kA | |
| Manufacturer | ABB | |
| Series | S200MT | |
| Model | S203MT-Z25NA | |
| Order code | 2CDS273106R0518 | |
| Product type | Miniature circuit breaker | |
| Rated current | 25 A | |
| Number of poles | 3 protected poles + neutral | |
| Total pole configuration | 4 pole | |
| Tripping characteristic | Z curve | |
| Rated operational voltage | 400 V AC | |
| Rated insulation voltage | 440 V | |
| Rated impulse withstand voltage | 4 kV | |
| Rated frequency | 50 / 60 Hz | |
| Breaking capacity | 10 kA | |
| Rated ultimate breaking capacity (Icu) | 15 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 | |
| Mechanical endurance | 20,000 operating cycles | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203MT-Z25NA used for?
The ABB S203MT-Z25NA provides overload and short-circuit protection for three-phase electrical circuits, particularly those supplying sensitive electronic and control equipment.
What is the current rating of this MCB?
The ABB S203MT-Z25NA has a rated current of 25 A.
What does the Z curve characteristic mean?
The Z curve provides very fast magnetic tripping, making it suitable for sensitive circuits where rapid disconnection during fault conditions is essential.
Is this a 3-pole circuit breaker?
It features three protected poles together with a switched neutral, providing a 3P+N configuration for three-phase systems.
Where is the S203MT-Z25NA typically installed?
It is commonly installed on DIN rail inside control panels, distribution boards, switchgear assemblies and railway electrical equipment.
Trusted by Electrical Engineers Worldwide
ABB S200MT miniature circuit breakers are trusted by panel builders, railway engineers and industrial electricians for dependable circuit protection in demanding low-voltage applications.
