Hager RCD 25A Type A 30mA 4 Pole 4 Module CDA425U

Hager CDA425U: 25A 30mA 4 Pole RCCB Type A residual current circuit breaker with 6kA short-circuit breaking capacity and IP20 protection for DIN rail installation.

Safety & Reliability

This Hager RCCB automatically opens the circuit the moment it detects an earth fault between line and earth, or neutral and earth, cutting off power before a fault becomes a hazard. As a Type A residual current circuit breaker, it’s rated to detect both AC and pulsating DC fault currents, giving broader protection than a standard AC-only device on mixed loads.

A trip-free mechanism means the breaker cannot be held closed against a live fault, and a rectangular flag indicator shows contact status at a glance (red for closed, green for open), with a separate yellow flag confirming when the unit has tripped. For sites needing lockout, the RCCB can be padlocked on or off using a Hager MZN175.

Installation & Compliance

Designed for standard DIN rail mounting and taking up 4 modular spacings, this 4 pole RCCB is built to conform to BS EN 61008 and IEC1008, so it drops straight into compliant distribution board designs. Terminals accept up to 25mm² rigid or 16mm² flexible conductors, covering the cable sizes typically used on 16 to 63A circuits.

Rated at 400V with a 500V insulation voltage and 4kV impulse withstand voltage, it’s specified for robust performance on three-phase distribution work where reliable residual current protection is essential.

Built for Demanding Environments

An IP20 enclosure and pollution degree 2 rating suit this Hager Ltd RCCB to standard indoor electrical enclosures, while an operating range down to -25°C keeps it functional in cold plant rooms, garages, and unheated outbuildings. A 0.25kA surge current capacity adds a further layer of resilience against transient spikes on the supply.

Key Features of the Hager RCCB CDA425U Include:

• Automatic Disconnection On Earth Fault Between Line/Neutral And Earth
• Type A Residual Current Circuit Breaker (Rccb) Detects AC And Pulsating DC Fault Currents
• Trip-Free Mechanism Prevents Closing Onto A Live Fault
• Rectangular Flag Indicator: Red = Closed, Green = Open, Yellow = Tripped
• Padlockable On Or Off Using Hager MZN175
• Conforms To BS EN 61008 And IEC1008
• Rated Current: 25A
• Rated Residual Current: 30mA
• Number Of Poles: 4
• Rated Voltage: 400V
• Rated Insulation Voltage (Ui): 500V
• Rated Impulse Withstand Voltage (Uimp): 4kV
• Short-Circuit Breaking Capacity (Icw): 6kA
• Surge Current Capacity: 0.25kA
• Degree Of Protection: IP20
• Terminal Capacity: 25mm² Rigid / 16mm² Flexible
• Ambient Operating Temperature: -25°C And Above
• DIN Rail Mounting, 4 Module Width
• Supplied As Single Unit, Order Quantity 1

If you need some help, would like to take advantage of our Price Promise or have a large order to place, give our team of professionals a call on 0203 994 5470, drop us an email at sales@electricpoint.com or use our Contact Form.