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ABB S203M-K4NA MCB – S200M – 3P+N – K – 4A
ABB S203M-K4NA miniature circuit breaker from the System pro M compact S200M range featuring a 4 A rating, K curve characteristic, 3+NP configuration and 10 kA breaking capacity for industrial circuit protection.
£103.24
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.
Technical Specifications
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| Phase | Three Phase | |
|---|---|---|
| Current | 4 A | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | K curve | |
| Breaking Capacity | 10 kA | |
| Manufacturer | ABB | |
| Series | System pro M compact S200M | |
| Model | S203M-K4NA | |
| Product type | Miniature circuit breaker | |
| Product ID | 2CDS273103R0337 | |
| EAN | 4016779659499 | |
| Rated current | 4 A | |
| Tripping characteristic | K curve | |
| Pole configuration | 3+NP | |
| Rated operational voltage | 230 / 400 V AC | |
| Rated insulation voltage | 440 V | |
| Frequency | 50 / 60 Hz | |
| Rated breaking capacity | 10 kA | |
| Current limiting class | 3 | |
| Protection rating | IP20 | |
| Mounting type | DIN rail mounting | |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm | |
| Weight | approx. 0.50 kg | |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203M-K4NA used for?
The ABB S203M-K4NA protects three-phase electrical circuits against overloads and short circuits, particularly where inductive loads or high inrush currents are present.
What current rating does this circuit breaker have?
This miniature circuit breaker has a rated current of 4 A.
What does the K curve characteristic mean?
A K curve MCB is designed for circuits with higher inrush currents, making it suitable for motors, transformers and inductive loads.
What does the 3+NP configuration mean?
The S203M-K4NA provides three protected phase poles together with a switched neutral pole for three-phase electrical systems.
Where is this miniature circuit breaker installed?
It is designed for DIN rail installation inside electrical distribution boards, switchboards and industrial control panels.
Trusted by Electrical Professionals Worldwide
ABB System pro M compact miniature circuit breakers are trusted by electricians, panel builders and industrial engineers for dependable circuit protection, robust construction and long-term reliability.
