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2CCS573103R8205 ABB S403M-B20NP Miniature Circuit Breaker 20 A 3P+N Type B 10 kA
ABB S403M-B20NP is a 20 A 3P+N Type B miniature circuit breaker with protected neutral and 10 kA rated short-circuit breaking capacity, designed for reliable overload and short-circuit protection in ABB SMISSLINE TP electrical distribution systems.
£115.24
Why Choose the ABB S403M-B20NP Miniature Circuit Breaker?
The ABB S403M-B20NP is a 3P+N miniature circuit breaker (MCB) with protected neutral designed to provide reliable overload and short-circuit protection in commercial and industrial electrical distribution systems. Part of the ABB SMISSLINE TP S400M series, it combines dependable circuit protection with the installation efficiency of ABB's plug-in distribution system.
The S403M-B20NP uses a delayed thermal release for overload protection together with an electromechanical release for short-circuit protection. Its four-pole arrangement provides protection for the three phase conductors and neutral, with the neutral protected at 100% of the nominal value of the pole conductor.
With a rated current of 20 A, a Type B tripping characteristic and a rated short-circuit breaking capacity of 10 kA, the S403M-B20NP is suited to three-phase plus neutral circuits with relatively low starting and inrush currents. Its SMISSLINE TP plug-in design supports efficient installation, replacement and maintenance within compatible distribution assemblies.
Key Advantages
- Reliable 3P+N miniature circuit breaker with protected neutral.
- 20 A rated current for commercial and industrial distribution circuits.
- Type B tripping characteristic suitable for circuits with relatively low inrush currents.
- 10 kA rated short-circuit breaking capacity.
- Neutral protected at 100% of the nominal pole current.
- SMISSLINE TP plug-in connection supports efficient installation and maintenance.
Key Features
- ABB SMISSLINE TP S400M series.
- 20 A rated current.
- 3P+N / four-pole configuration.
- Protected neutral conductor.
- Type B tripping characteristic.
- 10 kA rated short-circuit breaking capacity (Icn).
- 230/400 V AC rated voltage.
- 240–415 V AC rated operational voltage.
- Plug-in design for the ABB SMISSLINE TP system.
- IP20 degree of protection.
Reliable 3P+N Circuit Protection
Miniature circuit breakers such as the ABB S403M-B20NP protect electrical circuits and conductors against excessive current caused by overloads and short circuits. The delayed thermal release responds to sustained overload conditions, while the electromechanical release provides rapid interruption when a short-circuit fault occurs.
The Type B characteristic is suited to circuits with relatively low starting and inrush currents, while the protected-neutral configuration extends overcurrent protection to the neutral conductor. Combined with the SMISSLINE TP plug-in architecture, the S403M-B20NP provides an efficient protection solution for three-phase plus neutral commercial and industrial distribution applications.
Typical Applications
- Three-phase plus neutral distribution circuits.
- Commercial electrical distribution boards.
- Industrial electrical control and distribution panels.
- General-purpose three-phase plus neutral loads.
- Circuits with relatively low starting and inrush currents.
- ABB SMISSLINE TP modular distribution systems.
Technical Specifications
| Series | SMISSLINE TP S400M |
|---|---|
| ABB order code | 2CCS573103R8205 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 20 A |
| Pole configuration | 3P+N |
| Total number of poles | 4 |
| Neutral | Protected, 100% of nominal pole current |
| Tripping characteristic | Type B |
| Rated voltage | 230/400 V AC |
| Rated operational voltage | 240–415 V AC |
| Rated insulation voltage (Ui) | 440 V |
| Rated impulse withstand voltage (Uimp) | 4 kV |
| Rated short-circuit breaking capacity (Icn) | 10 kA |
| Protection rating | IP20 |
| Connection / mounting system | SMISSLINE TP plug-in |
| Conductor capacity | 0.75–35 mm² |
| Standard | IEC/EN 60898-1 |
| Electrical endurance | 10,000 cycles |
| Operating ambient temperature | -25 to +60 °C |
| Number of modules | 4 |
| Dimensions (W × H × D) | 54 × 91 × 82 mm |
| Weight | approx. 428 g |
| EAN | 7612270103829 |
Frequently Asked Questions
What is the ABB S403M-B20NP used for?
The S403M-B20NP is a 3P+N miniature circuit breaker used to protect three-phase plus neutral electrical circuits against overloads and short circuits.
What is the current rating of the ABB S403M-B20NP?
The circuit breaker has a rated current of 20 A.
Is the neutral conductor protected on the S403M-B20NP?
Yes. The S403M-B20NP has a protected neutral, with the neutral protected at 100% of the nominal value of the pole conductor.
What is the short-circuit breaking capacity of the S403M-B20NP?
The ABB S403M-B20NP has a rated short-circuit breaking capacity (Icn) of 10 kA.
Which distribution system is the S403M-B20NP designed for?
The circuit breaker is designed as a plug-in protective device for the ABB SMISSLINE TP distribution system.
Trusted ABB Circuit Protection
ABB SMISSLINE TP S400M circuit breakers combine reliable overload and short-circuit protection with a modular plug-in architecture designed for efficient commercial and industrial electrical distribution.
