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2CSR256140R3204 ABB DS203NCC20A300 RCBO 3P+N C20 Type A 300 mA
ABB DS203NCC20A300 is a 20 A 3P+N C-curve Type A RCBO with 300 mA residual current sensitivity and 6 kA short-circuit capacity for three-phase electrical circuit protection.
£164.87
Why Choose the ABB DS203NCC20A300 RCBO?
The ABB DS203NCC20A300 is a compact and reliable 3P+N residual current circuit breaker with overcurrent protection (RCBO) designed to provide combined protection against overloads, short circuits and earth leakage currents in three-phase electrical installations. As part of the ABB DS203NC series, it combines residual current and overcurrent protection within a four-module device, helping reduce panel space and simplify distribution board design.
This RCBO features a Type C tripping characteristic, a 20 A rated current and Type A residual current protection. Type A detection provides protection against sinusoidal AC residual currents as well as pulsating DC residual currents, making the device suitable for a wide range of modern electrical loads and installations.
With a rated residual operating current of 300 mA and a rated short-circuit capacity of 6 kA, the DS203NCC20A300 provides dependable circuit and earth-fault protection for three-phase systems. Its DIN-rail format and four-module width make it suitable for distribution boards, control panels and commercial or industrial electrical installations.
Key Advantages
- Combined residual current and overcurrent protection in one compact RCBO.
- 3P+N configuration for three-phase circuits with neutral.
- 20 A rated current with Type C tripping characteristic.
- 300 mA Type A residual current protection.
- 6 kA rated short-circuit capacity.
- Compact four-module DIN-rail design helps optimise distribution board space.
- Protects against overload, short-circuit and residual earth-fault currents.
Key Features
- ABB DS203NC RCBO series.
- 20 A rated current.
- Type C tripping characteristic.
- Type A residual current detection.
- 300 mA rated residual operating current.
- 3P+N, four-pole configuration.
- 6 kA rated short-circuit capacity.
- 10 kA ultimate short-circuit breaking capacity.
- 50 / 60 Hz rated frequency.
- DIN-rail mounting for modular electrical distribution systems.
Combined Circuit and Residual Current Protection
RCBOs such as the ABB DS203NC combine the functions of a miniature circuit breaker and residual current protective device in a single unit. This allows one device to protect a circuit against overload and short-circuit conditions while also detecting residual currents caused by insulation faults or current leakage to earth.
The DS203NCC20A300 uses Type A residual current detection and a C-curve overcurrent characteristic. Type A technology detects sinusoidal AC and pulsating DC residual currents, while the C-curve characteristic makes the device suitable for circuits with moderate inrush currents found in many commercial and industrial electrical loads.
Typical Applications
- Three-phase electrical distribution boards.
- Commercial and industrial electrical installations.
- Machinery and automation control panels.
- Three-phase circuits requiring combined overcurrent and earth-leakage protection.
- Building services and electrical distribution systems.
- Circuits containing electronic equipment capable of producing pulsating DC residual currents.
Technical Specifications
| Series | DS203NC |
|---|---|
| Product group | DS200 / DSH200 RCBO |
| ABB order code | 2CSR256140R3204 |
| EAN / GTIN | 8012542831020 |
| 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 curve |
| Residual current type | Type A |
| Rated residual operating current | 300 mA |
| Rated frequency | 50 / 60 Hz |
| Rated short-circuit capacity | 6 kA |
| Ultimate short-circuit breaking capacity | 10 kA |
| Service short-circuit breaking capacity | 6 kA |
| Protection rating | IP2X |
| Pollution degree | 2 |
| Overvoltage category | III |
| Energy limiting class | 3 |
| Residual current operating characteristic | Undelayed |
| Neutral conductor switching | Yes |
| Terminal capacity, solid conductor | up to 25 mm² |
| Terminal capacity, multi-wired conductor | up to 25 mm² |
| Mounting type | DIN rail |
| Module width | 4 modules |
| Built-in depth | 69 mm |
| Weight | approx. 0.48 kg |
Frequently Asked Questions
What is the ABB DS203NCC20A300 used for?
The ABB DS203NCC20A300 is a 3P+N RCBO used to protect three-phase electrical circuits against overloads, short circuits and residual earth-fault currents.
What is the current rating of the DS203NCC20A300?
The DS203NCC20A300 has a rated current of 20 A and uses a Type C tripping characteristic.
What residual current sensitivity does this RCBO provide?
This model has a rated residual operating current of 300 mA and provides Type A residual current protection.
What is the short-circuit rating of the ABB DS203NCC20A300?
The RCBO has a rated short-circuit capacity of 6 kA and an ultimate short-circuit breaking capacity of 10 kA.
How many poles does the DS203NCC20A300 have?
The DS203NCC20A300 is a 3P+N four-pole RCBO with three protected poles, designed for three-phase circuits with a neutral conductor.
Trusted ABB Circuit Protection
ABB DS203NC residual current circuit breakers with overcurrent protection combine compact modular construction with dependable overload, short-circuit and residual current protection for modern three-phase electrical distribution systems.
