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2CSR256040R3085 ABB DS203NCB8AC300 RCBO 3P+N B8 300mA Type AC 6kA
ABB DS203NCB8AC300 is an 8 A 3P+N Type B RCBO with 300 mA Type AC residual-current protection and a 6 kA rated short-circuit breaking capacity for three-phase electrical circuits.
£151.14
Why Choose the ABB DS203NCB8AC300 RCBO?
The ABB DS203NCB8AC300 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 within a single four-pole modular device for efficient distribution-board installations.
This RCBO has a rated current of 8 A, a Type B 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 electrical circuits where this form of residual-current protection is specified.
With a rated operational voltage of 415 V AC and a rated short-circuit breaking capacity of 6 kA, the DS203NC B8 AC300 provides coordinated protection for three-phase plus neutral circuits. Its four-module DIN-rail format combines multiple protection functions in a compact device, helping simplify panel design and installation.
Key Advantages
- Combined residual-current, overload and short-circuit protection in one device.
- 8 A rated current with Type B tripping characteristic.
- 300 mA rated residual operating current.
- Type AC residual-current detection for sinusoidal alternating residual currents.
- 3P+N configuration for three-phase circuits with neutral.
- 6 kA rated short-circuit breaking capacity according to EN 61009-1.
Key Features
- ABB DS203NC RCBO series.
- 8 A rated current.
- Type B tripping curve.
- 300 mA residual-current sensitivity.
- Type AC residual-current characteristic.
- 3 protected poles plus neutral.
- 415 V AC rated operational voltage.
- 6 kA rated short-circuit breaking capacity.
- Compact four-module DIN-rail design.
Reliable Protection for Three-Phase Circuits
RCBOs combine the functions of an overcurrent protective device and a residual-current protective device in a single unit. The ABB DS203NCB8AC300 therefore protects circuits against excessive current caused by overloads or short circuits while also detecting residual currents that can occur as a result of insulation faults or leakage to earth.
The DS203NC series is designed for compact modular electrical distribution systems. Its 3P+N arrangement allows simultaneous switching of three phases and neutral, while the integrated Type B overcurrent characteristic and Type AC residual-current function provide coordinated circuit protection in suitable commercial, industrial and infrastructure applications.
Typical Applications
- Three-phase electrical distribution circuits.
- Commercial and industrial distribution boards.
- Electrical control panels and switchboards.
- Three-phase circuits requiring 3P+N switching.
- Circuits requiring combined overcurrent and residual-current protection.
- Building services and infrastructure electrical systems.
Technical Specifications
| Series | DS203NC |
|---|---|
| SKU | DS203NCB8AC300 |
| ABB order code | 2CSR256040R3085 |
| Product type | Residual current circuit breaker with overcurrent protection (RCBO) |
| Rated current | 8 A |
| Tripping characteristic | B |
| Rated residual operating current | 300 mA |
| Residual-current type | AC |
| Number of poles | 4 (3P+N) |
| Protected poles | 3 |
| Rated operational 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 |
| Rated insulation voltage (Ui) | 500 V |
| Rated impulse withstand voltage (Uimp) | 4 kV |
| Protection rating | IP2X |
| Pollution degree | 2 |
| Operating temperature | -25 to +55 °C |
| Power loss | 11.8 W |
| Dimensions (H × W × D) | 85 × 71 × 69 mm |
| Weight | 480 g |
| Standards | IEC 61009-1, IEC 61009-2-1, EN 61009-1, EN 61009-2-1 |
| EAN | 8012542353324 |
Frequently Asked Questions
What is the ABB DS203NCB8AC300 used for?
The ABB DS203NCB8AC300 is an RCBO designed to protect three-phase plus neutral electrical circuits against overloads, short circuits and residual earth-fault currents.
What is the rated current of the DS203NCB8AC300?
The RCBO has a rated current of 8 A and uses a Type B tripping characteristic.
What residual-current sensitivity does this RCBO provide?
The DS203NCB8AC300 has a rated residual operating current of 300 mA and is a Type AC residual-current device.
What is the breaking capacity of the ABB DS203NCB8AC300?
The device has a rated short-circuit breaking capacity of 6 kA according to EN 61009-1.
How many poles does the DS203NCB8AC300 have?
The device is a 3P+N four-pole RCBO, with three protected phase poles and a neutral pole.
Trusted ABB Circuit Protection
ABB DS200 and DS203NC residual current circuit breakers with overcurrent protection provide compact combined protection for electrical distribution systems, helping protect circuits against overloads, short circuits and residual earth-fault currents.
