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ABB S203-B4NA MCB – S200P – 3+NP – B – 4A
ABB S203-B4NA 3P+N miniature circuit breaker with 4 A rated current, B curve tripping characteristic and DIN rail mounting for professional electrical circuit protection.
£91.72
Why Choose the ABB S203-B4NA Miniature Circuit Breaker?
The ABB S203-B4NA is a compact and reliable 3P+N miniature circuit breaker (MCB) from the ABB System pro M compact S200 series. Designed for dependable protection against overloads and short circuits, it is suitable for professional electrical installations across commercial, industrial and building distribution systems.
This miniature circuit breaker uses ABB's current-limiting technology with a delayed thermal tripping mechanism for overload protection and an electromechanical tripping mechanism for short-circuit protection. Its robust construction, clear switching indication and DIN rail mounting format make it a practical choice for panel builders and electrical contractors.
With a 4 A rated current, B curve tripping characteristic and 3P+N configuration, the S203-B4NA is ideal for protecting three-phase circuits with neutral where lower inrush currents are expected. It is commonly used in distribution boards, control panels and general electrical protection applications.
Key Advantages
- Compact 3P+N miniature circuit breaker for professional circuit protection.
- 4 A rated current suitable for low-current electrical circuits.
- B curve tripping characteristic for circuits with low inrush current.
- Current-limiting design helps reduce fault energy.
- DIN rail mounting for fast installation in distribution boards and panels.
- Part of the trusted ABB System pro M compact S200 range.
Key Features
- ABB System pro M compact S200 series.
- Product ID: 2CDS253103R0045.
- Model: S203-B4NA.
- Rated current: 4 A.
- B curve tripping characteristic.
- 3P+N configuration with three protected poles and neutral.
- Thermal overload and electromechanical short-circuit tripping.
- Compact DIN rail design with screw terminal connections.
Reliable Protection for Electrical Distribution Systems
Miniature circuit breakers protect electrical circuits by automatically disconnecting the supply when overloads or short circuits occur. The ABB S203-B4NA helps protect cables, equipment and connected loads by combining reliable thermal and magnetic tripping performance in a compact modular device.
As part of the ABB System pro M compact range, this MCB is designed for straightforward installation, dependable operation and compatibility with professional distribution board and control panel assemblies.
Typical Applications
- Commercial electrical distribution boards.
- Industrial control panels.
- Three-phase circuits with neutral.
- Building electrical installations.
- OEM machinery and automation panels.
- General low-current circuit protection.
Technical Specifications
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| Phase | Three Phase | |
|---|---|---|
| Current | 4 A | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 6 kA | |
| Manufacturer | ABB | |
| Series | System pro M compact S200 | |
| Model | S203-B4NA | |
| Product ID | 2CDS253103R0045 | |
| EAN | 4016779926591 | |
| Product type | Miniature circuit breaker (MCB) | |
| Rated current | 4 A | |
| Tripping characteristic | B | |
| Number of poles | 3P+N | |
| Protected poles | 3 | |
| Rated operational voltage | 400 V AC | |
| Rated insulation voltage | 440 V | |
| Frequency | 50 / 60 Hz | |
| Rated short-circuit breaking capacity | 6 kA / 10 kA depending on standard and installation conditions | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Terminal type | Screw terminals | |
| Built-in depth | approx. 69 mm | |
| Weight | approx. 0.46 kg |
Frequently Asked Questions
What is the ABB S203-B4NA used for?
The ABB S203-B4NA is used to protect three-phase electrical circuits with neutral against overloads and short circuits.
What is the rated current of this miniature circuit breaker?
This MCB has a 4 A rated current, making it suitable for low-current circuit protection applications.
What does the B curve characteristic mean?
A B curve breaker trips at relatively low fault current levels, making it suitable for circuits with low inrush currents such as lighting, control and general distribution circuits.
How many poles does the S203-B4NA have?
The S203-B4NA has a 3P+N configuration, providing three protected poles plus neutral switching.
How is this ABB MCB installed?
The ABB S203-B4NA is designed for standard DIN rail mounting in electrical distribution boards and control panels.
Trusted by Electrical Professionals Worldwide
ABB System pro M compact miniature circuit breakers are trusted by electrical contractors, panel builders and engineers for reliable protection, compact installation and dependable performance in modern electrical systems.
