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2CSR256040R3204 ABB DS203NCC20AC300 RCBO 3P+N C20 Type AC 300mA 6kA
ABB DS203NCC20AC300 is a 20 A 3P+N Type C RCBO with 300 mA Type AC residual-current protection, a 415 V AC rating and 6 kA rated short-circuit breaking capacity.
£137.36
Why Choose the ABB DS203NCC20AC300 RCBO?
The ABB DS203NCC20AC300 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 RCBO series, it combines residual-current and overcurrent protection within a single four-module device for efficient electrical distribution installations.
This RCBO has a rated current of 20 A, a Type C tripping characteristic and a rated residual operating current of 300 mA. Its Type AC residual-current characteristic provides detection of sinusoidal alternating residual currents, making the device suitable for appropriate AC circuits where this form of residual-current protection is specified.
With a rated voltage of 415 V AC and a rated short-circuit breaking capacity of 6 kA, the DS203NC C20 AC300 provides coordinated protection for three-phase plus neutral circuits. Its compact DIN-rail format occupies only four modules, helping reduce panel space compared with separate residual-current and overcurrent protection devices.
Key Advantages
- Combined residual-current, overload and short-circuit protection in one device.
- 20 A rated current with Type C tripping characteristic.
- 300 mA rated residual operating current.
- Type AC residual-current detection for sinusoidal alternating residual currents.
- 3P+N configuration for modern three-phase electrical systems.
- 6 kA rated short-circuit breaking capacity.
Key Features
- ABB DS203NC RCBO series.
- 20 A rated current.
- Type C tripping curve.
- 300 mA residual-current sensitivity.
- Type AC residual-current characteristic.
- 3P+N four-pole configuration.
- 415 V AC rated voltage.
- 6 kA rated short-circuit breaking capacity.
- Integrated test pushbutton for functional verification.
- Earth-fault indicator and contact position indicator for easier status identification.
- Compact four-module DIN-rail design.
Reliable Protection for Three-Phase Circuits
RCBOs such as the ABB DS203NCC20AC300 combine the functions of an overcurrent protective device and a residual-current protective device in a single unit. This allows the circuit breaker to respond to overload and short-circuit conditions while its residual-current function detects earth-fault currents, providing coordinated protection for suitable three-phase electrical circuits.
The DS203NC series is specifically designed for increasingly compact three-phase electrical systems. Its four-module 3P+N construction can reduce the space required compared with a separate RCD and MCB arrangement, while the Type C overcurrent characteristic makes it suitable for appropriate circuits where moderate inrush currents may occur during normal operation.
Typical Applications
- Three-phase electrical distribution circuits.
- Commercial and industrial distribution boards.
- Electrical control panels and switchboards.
- Three-phase circuits requiring 3P+N protection.
- Circuits requiring combined overcurrent and residual-current protection.
- Building services and infrastructure electrical systems.
Technical Specifications
| Series | DS203NC |
|---|---|
| SKU | DS203NCC20AC300 |
| ABB order code | 2CSR256040R3204 |
| Product type | Residual current circuit breaker with overcurrent protection (RCBO) |
| Rated current | 20 A |
| Tripping characteristic | C |
| Rated residual operating current | 300 mA |
| Residual-current type | AC |
| Number of poles | 4 (3P+N) |
| Rated voltage | 415 V AC |
| Rated frequency | 50–60 Hz |
| Rated short-circuit breaking capacity (Icn) | 6 kA |
| Rated ultimate short-circuit breaking capacity (Icu) | 10 kA |
| Protection rating | IP2X |
| Mounting type | DIN rail |
| Width | 4 modules |
| Dimensions (W × H × D) | 71 × 85 × 69 mm |
| Weight | 480 g |
| Standards | IEC 61009-1, IEC 61009-2-1, EN 61009-1, EN 61009-2-1 |
| EAN | 8012542185420 |
Frequently Asked Questions
What is the ABB DS203NCC20AC300 used for?
The ABB DS203NCC20AC300 is an RCBO designed to protect suitable three-phase plus neutral electrical circuits against overloads, short circuits and residual earth-fault currents.
What is the rated current of the DS203NCC20AC300?
The RCBO has a rated current of 20 A and uses a Type C tripping characteristic.
What residual-current sensitivity does this RCBO provide?
The DS203NCC20AC300 has a rated residual operating current of 300 mA and uses a Type AC residual-current characteristic.
What is the breaking capacity of the ABB DS203NCC20AC300?
The device has a rated short-circuit breaking capacity of 6 kA according to IEC/EN 61009.
How much panel space does the DS203NCC20AC300 require?
The DS203NC C20 AC300 has a compact four-module width, helping reduce the switchboard space required for combined residual-current and overcurrent protection.
Trusted ABB Circuit Protection
ABB DS203NC residual current circuit breakers with overcurrent protection provide compact combined protection for modern three-phase electrical distribution systems, integrating overcurrent and earth-fault protection in a space-saving four-module design.
