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2CSR256140R3255 ABB DS203NCB25A300 DS203NC B25 A300 3P+N Type A RCBO 25A 300mA
ABB DS203NCB25A300 is a 3P+N Type A RCBO with 25 A rated current, B tripping characteristic, 300 mA residual-current sensitivity and 6 kA breaking capacity for three-phase circuit protection.
£181.35
Why Choose the ABB DS203NCB25A300 RCBO?
The ABB DS203NCB25A300 is a compact and reliable 3P+N residual current circuit breaker with overcurrent protection (RCBO) designed to protect three-phase electrical circuits against overloads, short circuits and residual earth-fault currents. As part of the ABB DS203NC series, it combines residual-current and overcurrent protection in a single modular device for efficient electrical distribution.
This RCBO features a 25 A rated current, B tripping characteristic and Type A residual-current detection. Type A protection detects sinusoidal AC residual currents as well as pulsating DC residual currents, making the DS203NCB25A300 suitable for a broad range of commercial and industrial electrical circuits.
With a rated residual operating current of 300 mA and a rated short-circuit breaking capacity of 6 kA according to EN/IEC 61009, the DS203NCB25A300 provides coordinated overcurrent and earth-fault protection. Its compact 3P+N four-module construction incorporates three protected poles and a switched neutral, helping conserve space in three-phase distribution boards.
Key Advantages
- Combined residual-current, overload and short-circuit protection in one device.
- 3P+N configuration designed for three-phase circuits with neutral.
- 25 A rated current with B tripping characteristic.
- 300 mA Type A residual-current sensitivity.
- 6 kA rated short-circuit breaking capacity according to EN/IEC 61009.
- Compact four-module format helps conserve distribution-board space.
- Type A detection supports circuits where pulsating DC residual currents may occur.
- DIN-rail construction enables straightforward installation in modular distribution equipment.
Key Features
- ABB DS203NC RCBO series.
- 3P+N configuration with three protected poles.
- 25 A rated current.
- B tripping characteristic.
- Type A residual-current detection.
- 300 mA rated residual operating current.
- 400–415 V AC rated voltage.
- 50/60 Hz rated frequency.
- 6 kA Icn breaking capacity according to EN/IEC 61009.
- 10 kA ultimate short-circuit breaking capacity according to IEC 60947-2.
- Integrated test functionality for checking residual-current operation.
- Compact four-module DIN-rail design.
Reliable Protection for Three-Phase Electrical Circuits
RCBOs combine the protective functions of a miniature circuit breaker and a residual-current device in one unit. The ABB DS203NCB25A300 responds to overload and short-circuit conditions while simultaneously monitoring residual current flowing to earth, providing coordinated protection for conductors, connected equipment and electrical installations.
The ABB DS203NC series provides this combined protection in a compact DIN-rail format. The B characteristic of the DS203NCB25A300 is suited to circuits with relatively low inrush currents, while Type A residual-current detection provides protection against both sinusoidal AC and pulsating DC residual currents.
Typical Applications
- Three-phase commercial electrical distribution systems.
- Industrial electrical distribution boards.
- General-purpose three-phase circuits.
- Circuits with relatively low starting and inrush currents.
- Three-phase circuits requiring Type A residual-current protection.
- Compact switchboards and modular DIN-rail distribution equipment.
Technical Specifications
| Series | DS203NC |
|---|---|
| SKU | DS203NCB25A300 |
| ABB order code | 2CSR256140R3255 |
| Product group | DS200 / DSH200 RCBO |
| Product type | Residual current circuit breaker with overcurrent protection (RCBO) |
| Number of poles | 3P+N / 4 poles |
| Protected poles | 3 |
| Rated current | 25 A |
| Tripping characteristic | B |
| Residual-current type | Type A |
| Rated residual operating current | 300 mA |
| Rated voltage | 400–415 V AC |
| Frequency | 50/60 Hz |
| Rated short-circuit breaking capacity Icn | 6 kA |
| Rated ultimate short-circuit breaking capacity Icu | 10 kA |
| Rated insulation voltage Ui | 500 V |
| Rated impulse withstand voltage Uimp | 4 kV |
| Energy limiting class | 3 |
| Overvoltage category | III |
| Pollution degree | 2 |
| Operating temperature | -25 to +55 °C |
| Mounting type | DIN rail |
| Width | 4 modules / 71 mm |
| Built-in depth | 69 mm |
| Standards | IEC/EN 61009-1, IEC/EN 61009-2-1 |
Frequently Asked Questions
What is the ABB DS203NCB25A300 used for?
The ABB DS203NCB25A300 is a 3P+N RCBO designed to protect three-phase electrical circuits against overloads, short circuits and residual earth-fault currents.
What is the rated current and trip characteristic of the DS203NCB25A300?
The RCBO has a rated current of 25 A and uses a B tripping characteristic.
What residual-current protection does this RCBO provide?
The DS203NCB25A300 provides Type A residual-current protection with a rated residual operating current of 300 mA.
What is the breaking capacity of the ABB DS203NCB25A300?
The device has a rated short-circuit breaking capacity Icn of 6 kA according to EN/IEC 61009 and an ultimate short-circuit breaking capacity of 10 kA according to IEC 60947-2.
Where is the DS203NCB25A300 typically installed?
The DS203NCB25A300 is designed for DIN-rail installation in three-phase commercial and industrial distribution boards requiring combined residual-current and overcurrent protection.
Trusted ABB Circuit Protection
ABB DS203NC RCBOs combine residual-current and overcurrent protection in a compact four-module format, providing dependable circuit protection for modern three-phase commercial and industrial electrical installations.
