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2CSR256240R2204 ABB DS203NCC20AS100 DS203NC C20 A S100 3P+N Type A Selective RCBO 20A 100mA
ABB DS203NCC20AS100 is a 3P+N Type A selective RCBO with 20 A rated current, C tripping characteristic, 100 mA residual-current sensitivity and 6 kA breaking capacity for coordinated three-phase circuit protection.
£197.76
Why Choose the ABB DS203NCC20AS100 RCBO?
The ABB DS203NCC20AS100 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 overcurrent and residual-current protection in a single modular device for efficient commercial and industrial electrical distribution.
This RCBO features a 20 A rated current, C tripping characteristic and Type A selective (S) residual-current protection. Type A functionality detects sinusoidal AC and pulsating DC residual currents, while the selective time-delay characteristic supports discrimination with suitable downstream residual-current protective devices.
With a rated residual operating current of 100 mA and a rated short-circuit breaking capacity of 6 kA according to EN/IEC 61009, the DS203NCC20AS100 provides coordinated circuit 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 systems requiring selective residual-current protection.
Key Advantages
- Combined residual-current, overload and short-circuit protection in one device.
- 3P+N configuration for three-phase circuits with neutral.
- 20 A rated current with C tripping characteristic.
- 100 mA Type A selective (S) residual-current protection.
- Selective time-delay operation supports discrimination with downstream residual-current devices.
- 6 kA rated short-circuit breaking capacity according to EN/IEC 61009.
- Compact four-module format helps conserve distribution-board space.
- DIN-rail construction enables straightforward integration into modular distribution equipment.
Key Features
- ABB DS203NC RCBO series.
- 3P+N configuration with three protected poles.
- 20 A rated current.
- C tripping characteristic.
- Type A selective (S) residual-current characteristic.
- 100 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 verification of residual-current operation.
- Compact four-module DIN-rail format.
Reliable Selective Protection for Three-Phase Circuits
RCBOs combine the protective functions of a miniature circuit breaker and a residual-current device in one unit. The ABB DS203NCC20AS100 responds to overload and short-circuit conditions while monitoring residual current flowing to earth, providing coordinated protection for conductors, connected equipment and electrical installations.
The selective Type A characteristic introduces a deliberate time delay in residual-current operation, helping coordinate the DS203NCC20AS100 with suitable downstream residual-current devices. This supports discrimination in multi-level distribution systems by allowing a downstream protective device to clear a local residual-current fault before the upstream selective RCBO operates.
Typical Applications
- Three-phase commercial electrical distribution systems.
- Industrial electrical distribution boards.
- Distribution circuits requiring selective residual-current protection.
- Circuits coordinated with downstream RCDs or RCBOs.
- Three-phase loads requiring Type A residual-current detection.
- Compact switchboards and modular DIN-rail distribution equipment.
Technical Specifications
| Series | DS203NC |
|---|---|
| SKU | DS203NCC20AS100 |
| ABB order code | 2CSR256240R2204 |
| 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 | 20 A |
| Tripping characteristic | C |
| Residual-current type | Type A selective (S) |
| Rated residual operating current | 100 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 DS203NCC20AS100 used for?
The ABB DS203NCC20AS100 is a 3P+N RCBO used to protect three-phase circuits against overloads, short circuits and residual earth-fault currents while providing selective residual-current operation.
What is the rated current and trip characteristic of the DS203NCC20AS100?
The RCBO has a rated current of 20 A and uses a C tripping characteristic.
What residual-current protection does this RCBO provide?
The DS203NCC20AS100 provides Type A selective (S) residual-current protection with a rated residual operating current of 100 mA.
What does the selective S characteristic mean?
The selective S characteristic provides time-delayed residual-current operation to support discrimination with suitable downstream residual-current protective devices.
What is the breaking capacity of the ABB DS203NCC20AS100?
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.
Trusted ABB Circuit Protection
ABB DS203NC RCBOs combine residual-current and overcurrent protection in a compact modular format, supporting dependable and coordinated protection in modern three-phase commercial and industrial electrical installations.
