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2CSB203001R5250 ABB DDA203AC251 DDA203 AC-25/1 RCD Block 3P Type AC 25 A 1000 mA
ABB DDA203AC251 DDA203 AC-25/1 is a 3-pole 25 A 1000 mA Type AC residual current device block designed for residual-current protection of suitable three-phase circuits with compatible ABB miniature circuit breakers.
£73.48
Why Choose the ABB DDA203AC251 Residual Current Device Block?
The ABB DDA203AC251, manufacturer type DDA203 AC-25/1, is a 3-pole Type AC residual current device (RCD) block designed for combination with compatible ABB miniature circuit breakers. Part of the ABB DDA200 RCD series, it provides residual-current protection for suitable three-phase electrical distribution circuits in commercial and industrial installations.
The DDA203 AC-25/1 is designed to detect sinusoidal alternating residual currents. When assembled with a compatible ABB miniature circuit breaker, the DDA200 residual-current block allows earth-fault protection to be combined with overload and short-circuit protection in a coordinated modular protective assembly.
With a rated current of 25 A, a rated residual operating current of 1000 mA (1 A) and a 3-pole configuration, the DDA203AC251 is intended for three-phase circuits requiring Type AC residual-current monitoring at a higher residual-current threshold. Its modular construction supports integration into distribution boards, switchboards and electrical control panels.
Key Advantages
- Type AC residual-current protection for sinusoidal alternating earth-leakage currents.
- 25 A rated current for compatible three-phase circuits.
- 1000 mA (1 A) rated residual operating current.
- 3-pole configuration for suitable three-phase applications.
- Modular construction for combination with compatible ABB miniature circuit breakers.
- Enables residual-current protection to be combined with overload and short-circuit protection.
- Suitable for commercial and industrial electrical distribution systems.
Key Features
- ABB DDA200 residual current device block series.
- Type AC residual-current characteristic.
- 25 A rated current.
- 1000 mA (1 A) residual-current sensitivity.
- 3 poles.
- Designed to respond to sinusoidal alternating residual currents.
- Modular design for use with compatible ABB miniature circuit breakers.
- Suitable for three-phase electrical distribution and control-panel applications.
Reliable Residual-Current Protection for Three-Phase Circuits
Residual-current protection monitors the balance of current flowing through the circuit conductors and operates when leakage to earth reaches the specified operating threshold. The ABB DDA203 AC-25/1 provides Type AC detection for sinusoidal alternating residual currents, supporting earth-fault protection in suitable three-phase electrical systems.
The 1000 mA (1 A) residual-current setting is substantially higher than sensitivities typically used for additional protection against electric shock. This variant is therefore suited to applications where a higher residual-current operating threshold is specified. Combined with a compatible ABB miniature circuit breaker, the DDA200 modular design provides residual-current protection alongside overload and short-circuit protection.
Typical Applications
- Three-phase commercial electrical distribution systems.
- Industrial electrical installations.
- Distribution boards and sub-distribution panels.
- Electrical control and automation panels.
- Three-phase circuits requiring Type AC residual-current detection.
- Installations specifying a 1000 mA (1 A) residual-current operating threshold.
- Assemblies using compatible ABB miniature circuit breakers.
Technical Specifications
| Series | DDA200 |
|---|---|
| SKU | DDA203AC251 |
| ABB order code | 2CSB203001R5250 |
| Product type | Residual current device block / RCD block |
| Residual-current type | Type AC |
| Number of poles | 3 |
| Rated current | 25 A |
| Rated residual operating current | 1000 mA (1 A) |
| Rated frequency | 50–60 Hz |
| Rated insulation voltage | 500 V |
| Rated impulse withstand voltage | 4 kV |
| Protection rating | IP2X |
| Standard | IEC/EN 61009 Annex G |
Frequently Asked Questions
What is the ABB DDA203AC251 used for?
The ABB DDA203AC251 is a 3-pole Type AC RCD block designed for combination with compatible ABB miniature circuit breakers to provide residual-current protection for suitable three-phase electrical circuits.
What is the rated current of the DDA203 AC-25/1?
The ABB DDA203 AC-25/1 has a rated current of 25 A.
What is the residual-current sensitivity of the DDA203AC251?
The DDA203AC251 has a rated residual operating current of 1000 mA (1 A).
How many poles does the ABB DDA203AC251 have?
The DDA203AC251 is a 3-pole residual current device block intended for suitable three-phase circuit arrangements.
What residual currents can the DDA203 AC-25/1 detect?
As a Type AC device, the DDA203 AC-25/1 is designed to respond to sinusoidal alternating residual currents.
Trusted ABB Circuit Protection
ABB DDA200 residual current device blocks provide modular earth-fault protection for electrical distribution systems, combining with compatible ABB miniature circuit breakers to support coordinated protection in commercial and industrial installations.
