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2CSR256140R3105 ABB DS203NCB10A300 DS203NC B10 A300 3P+N Type A RCBO 10A 300mA
ABB DS203NCB10A300 is a 3P+N Type A RCBO with 10 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 DS203NCB10A300 RCBO?
The ABB DS203NCB10A300 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 10 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 DS203NCB10A300 suitable for circuits supplying a broad range of conventional and electronically controlled electrical equipment.
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 DS203NCB10A300 provides coordinated overcurrent and earth-fault protection. Its compact 3P+N four-module construction incorporates three protected poles and a switched neutral, making it well suited to three-phase distribution boards where installation space is important.
Key Advantages
- Combined residual-current, overload and short-circuit protection in one device.
- 3P+N configuration designed for three-phase circuits with neutral.
- 10 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 design helps conserve distribution-board space.
- Integrated test functionality enables periodic verification of residual-current operation.
- DIN-rail construction supports straightforward installation in modular distribution equipment.
Key Features
- ABB DS203NC RCBO series.
- 3P+N configuration with three protected poles.
- 10 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.
- IP2X protection rating.
- Compact four-module DIN-rail format.
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 DS203NCB10A300 responds to overload and short-circuit conditions while also monitoring residual current flowing to earth, providing coordinated protection for conductors, connected equipment and the wider electrical installation.
The ABB DS203NC series provides this combined protection in a compact DIN-rail format. With its B characteristic, the DS203NCB10A300 is intended for circuits where comparatively low prospective inrush currents are expected, while Type A residual-current detection provides compatibility with loads capable of producing pulsating DC residual currents.
Typical Applications
- Three-phase commercial electrical distribution systems.
- Industrial electrical distribution boards.
- Lighting and general distribution circuits.
- Three-phase circuits requiring Type A residual-current protection.
- Circuits requiring combined overload, short-circuit and earth-fault protection.
- Compact switchboards and modular DIN-rail distribution equipment.
Technical Specifications
| Series | DS203NC |
|---|---|
| SKU | DS203NCB10A300 |
| ABB order code | 2CSR256140R3105 |
| Product type | Residual current circuit breaker with overcurrent protection (RCBO) |
| Number of poles | 3P+N / 4 poles |
| Protected poles | 3 |
| Rated current | 10 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 service short-circuit breaking capacity Ics | 6 kA |
| Rated insulation voltage Ui | 500 V |
| Rated impulse withstand voltage Uimp | 4 kV |
| Energy limiting class | 3 |
| Overvoltage category | III |
| Pollution degree | 2 |
| Protection rating | IP2X |
| Operating temperature | -25 to +55 °C |
| Mounting type | DIN rail |
| Width | 4 modules / 71 mm |
| Built-in depth | 69 mm |
| Weight | approx. 0.48 kg |
| Standards | IEC/EN 61009-1, IEC/EN 61009-2-1 |
Frequently Asked Questions
What is the ABB DS203NCB10A300 used for?
The ABB DS203NCB10A300 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 DS203NCB10A300?
The RCBO has a rated current of 10 A and uses a B tripping characteristic.
What residual-current protection does this RCBO provide?
The DS203NCB10A300 provides Type A residual-current protection with a rated residual operating current of 300 mA.
What is the breaking capacity of the ABB DS203NCB10A300?
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.
How much space does the DS203NCB10A300 require?
The DS203NCB10A300 occupies four DIN modules with a width of 71 mm, combining 3P+N residual-current and overcurrent protection in a compact installation footprint.
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.
