2CSB204592R3250 ABB DDA204B250.3APR DDA204 B-25/0.3 AP-R RCD 4P Type B 300mA 25A

Why Choose the ABB DDA204B250.3APR RCD Block?

The ABB DDA204B250.3APR is a four-pole Type B AP-R residual current device (RCD) block designed for assembly with compatible ABB miniature circuit breakers. Part of the ABB DDA200 RCD series, it provides comprehensive residual-current detection for electrical installations containing power electronics, where AC, pulsating DC and smooth DC earth-leakage currents may occur.

Rated at 25 A with a rated residual operating current of 300 mA, the DDA204B250.3APR combines Type B residual-current detection with ABB's AP-R high-immunity characteristic. The AP-R design incorporates a short intentional delay and enhanced resistance to transient disturbances, helping reduce unwanted tripping and improve continuity of service in demanding electrical installations.

The four-pole configuration makes the DDA204B250.3APR suitable for three-phase systems with neutral, particularly where variable-speed drives, frequency converters, UPS systems and other electronic equipment can generate complex residual-current waveforms. When assembled with a compatible ABB miniature circuit breaker, it provides residual-current protection alongside the overload and short-circuit protection supplied by the associated breaker.

Key Advantages

• Type B residual current protection for AC, pulsating DC and smooth DC residual currents.
• AP-R high-immunity characteristic helps reduce unwanted tripping caused by transient disturbances.
• 300 mA residual current sensitivity for higher-threshold earth-leakage protection.
• 25 A rated current for compatible electrical distribution circuits.
• Four-pole configuration suitable for three-phase systems with neutral.
• Well suited to installations containing power electronic equipment and frequency converters.
• Modular design for combination with compatible ABB miniature circuit breakers.

Key Features

• ABB DDA200 RCD series.
• Type B residual current characteristic.
• AP-R high-immunity / anti-nuisance tripping design.
• 25 A rated current.
• 300 mA residual current sensitivity.
• 4-pole design.
• Detection of sinusoidal AC, pulsating DC and smooth DC residual currents.
• 10 ms AP-R intentional delay.
• 3 kA surge-current resistance.
• Designed for applications with modern power electronic loads.

Type B AP-R Protection for Power Electronic Loads

The ABB DDA204B250.3APR provides broader residual-current detection than Type AC or Type A devices. Its Type B characteristic enables detection of sinusoidal AC, pulsating DC and smooth DC residual currents, making it suitable for installations containing electronic converters and other equipment capable of producing DC components in earth-leakage currents.

ABB's AP-R high-immunity characteristic incorporates a short intentional delay of approximately 10 ms and enhanced surge-current resistance of up to 3 kA, helping prevent unwanted operation caused by transient leakage-current peaks. Its 300 mA sensitivity is intended for appropriate higher-threshold residual-current protection applications and does not replace 30 mA additional protection where that sensitivity is required.

Typical Applications

• Industrial three-phase electrical distribution systems.
• Commercial installations containing power electronic equipment.
• Variable-speed drives and frequency converter circuits.
• UPS and power conversion equipment.
• Industrial machinery and automation systems.
• Three-phase circuits with neutral.
• Installations where smooth DC residual currents may occur.
• Circuits requiring 300 mA Type B residual current protection with enhanced immunity to transient disturbances.