Why Choose the ABB S203M-K4NA Miniature Circuit Breaker?
The ABB S203M-K4NA is a professional miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection for commercial, industrial and control panel applications. As part of the trusted ABB System pro M compact S200M series, it delivers dependable current-limiting protection for modern electrical installations.
This miniature circuit breaker features a K curve tripping characteristic, making it suitable for circuits with higher inrush currents than standard B or C curve devices. It is ideal for protecting transformers, control circuits, inductive loads and machinery where nuisance tripping must be minimised while maintaining reliable fault protection.
With a rated current of 4 A, a 3+NP pole configuration and a breaking capacity of up to 10 kA at 230 / 400 V AC, the S203M-K4NA is ideal for specialised three-phase circuit protection applications requiring a switched neutral. Its compact DIN rail design enables straightforward installation within distribution boards and electrical control panels.
Key Advantages
- Professional ABB miniature circuit breaker for industrial circuit protection.
- 4 A rated current for low-current three-phase circuits.
- K curve tripping characteristic for inductive loads and higher inrush currents.
- 3+NP configuration for three-phase systems with switched neutral.
- Current-limiting design helps protect cables and connected equipment.
- DIN rail mounting for fast installation in switchboards and control panels.
Key Features
- ABB System pro M compact S200M series.
- 4 A rated current.
- K curve tripping characteristic.
- 3+NP pole configuration.
- 10 kA rated short-circuit breaking capacity.
- Thermal overload protection.
- Electromechanical short-circuit protection.
- Compact DIN rail mounting.
Reliable Protection for Inductive Electrical Loads
Miniature circuit breakers such as the ABB S203M-K4NA automatically disconnect electrical circuits during overload and short-circuit conditions, helping to protect cables, machinery and connected equipment while improving electrical safety.
The ABB S200M range combines compact dimensions with high breaking capacity and dependable performance. Its K curve characteristic makes this model particularly suitable for transformers, motors, control circuits and other equipment with elevated starting currents.
Typical Applications
- Industrial control panels.
- Transformer protection.
- Motor control circuits.
- Machine building and OEM equipment.
- Commercial switchboards.
- Automation and process control systems.
