2CSB203101R4250 ABB DDA203A250.5 DDA203 A-25/0.5 RCD Block 3P Type A 25 A 500 mA

Why Choose the ABB DDA203A250.5 Residual Current Device Block?

The ABB DDA203A250.5, manufacturer type DDA203 A-25/0.5, is a 3-pole Type A 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 A-25/0.5 is designed to detect both sinusoidal AC and pulsating DC residual currents. This Type A characteristic makes it suitable for circuits containing electrical and electronic equipment that may produce pulsating DC earth-leakage currents in addition to conventional alternating residual currents.

With a rated current of 25 A, a rated residual operating current of 500 mA and a 3-pole configuration, the DDA203A250.5 provides earth-leakage detection for suitable three-phase circuits. When assembled with a compatible ABB miniature circuit breaker, it forms a coordinated modular solution combining residual-current protection with overload and short-circuit protection.

Key Advantages

• Type A residual-current protection for sinusoidal AC and pulsating DC residual currents.
• 25 A rated current for compatible three-phase circuits.
• 500 mA rated residual operating current.
• 3-pole configuration for suitable three-phase applications.
• Suitable for circuits containing modern electrical and electronic equipment.
• Designed for combination with compatible ABB miniature circuit breakers.
• Enables residual-current protection to be combined with overload and short-circuit protection.

Key Features

• ABB DDA200 residual current device block series.
• Type A residual-current characteristic.
• 25 A rated current.
• 500 mA rated residual operating current.
• 3 poles.
• Detection of sinusoidal AC and pulsating DC residual currents.
• Modular construction for use with compatible ABB miniature circuit breakers.
• Suitable for commercial and industrial three-phase electrical distribution.

Reliable Type A Protection for Three-Phase Circuits

Type A residual-current protection responds to sinusoidal alternating residual currents as well as pulsating DC residual currents. This detection capability makes the ABB DDA203 A-25/0.5 suitable for electrical installations containing electronic components and rectifier-based loads that can produce residual-current waveforms requiring Type A protection.

The 500 mA residual-current operating threshold is intended for applications where a higher earth-leakage trip level is specified rather than sensitive additional protection. The DDA200 modular design allows the RCD block to be combined with a compatible ABB miniature circuit breaker, providing residual-current protection together with overload and short-circuit protection in a coordinated assembly.

Typical Applications

• Three-phase commercial electrical distribution systems.
• Industrial electrical installations.
• Distribution boards and sub-distribution panels.
• Electrical control and automation panels.
• Circuits containing electronic equipment capable of producing pulsating DC residual currents.
• Three-phase circuits requiring 500 mA Type A residual-current protection.
• Assemblies using compatible ABB miniature circuit breakers.