Hager RCD 40A Type A 30mA 2 Pole 2 Module CDA240U

Hager CDA240U: 40A 30mA 2 Pole RCCB Type A residual current circuit breaker (RCCB) for DIN rail distribution boards, manufactured by Hager Ltd.

Safety & Reliability

This residual current circuit breaker rccb trips automatically when it detects an earth fault between line and earth, or neutral and earth, cutting the circuit before a fault becomes dangerous. Type A leakage current detection covers both AC and pulsating DC fault currents, giving broader protection than a standard Type AC device on mixed installations.

A trip-free mechanism prevents the contacts from being held closed during a fault, and the unit can be padlocked on or off using an MZN175 accessory for safe isolation during maintenance and testing.

Clear Fault Indication

A rectangular flag indicator shows contact position at a glance: red for closed, green for open. When the device trips on a fault, the flag switches to yellow, letting engineers identify a tripped rccb without opening the enclosure or running a full board test.

Installation & Compliance

DIN rail mounting and a 2-module width keep panel layouts compact, while terminals accept up to 25mm² rigid or 16mm² flexible conductors for straightforward first-fix and testing. The unit is built to BS EN 61008 and IEC1008, making it a straightforward specification choice for compliant residual circuit current breaker protection on commercial and domestic boards.

Where a board also needs arc fault detection, this RCCB pairs with a Hager AFDD device so earth leakage and arcing fault risks are both covered within the same distribution board.

Key Features of the Hager CDA240U Include:

• Automatically Disconnects The Circuit On An Earth Fault Between Line And Earth, Or Neutral And Earth
• Type A Leakage Detection Covers Both AC And Pulsating DC Fault Currents
• Trip-Free Mechanism Prevents Contacts Being Held Closed During A Fault
• Padlockable On Or Off Using An MZN175 Accessory For Safe Isolation
• Rectangular Flag Indicator: Red = Closed, Green = Open, Yellow = Tripped
• Rated Current: 40A
• Rated Residual Current: 30mA
• Number Of Poles: 2
• Leakage Current Type: A
• Rated Voltage: 230V, Rated Insulation Voltage: 500V
• Rated Impulse-Withstand Voltage (Uimp): 4kV
• Short-Circuit Breaking Capacity (Icw): 6kA
• Surge Current Capacity: 0.25kA
• Pollution Degree: 2
• Degree Of Protection: IP20
• Mounting: DIN Rail, Width: 2 Modular Spacings
• Terminal Capacity: Up To 25mm² Rigid, 16mm² Flexible
• Operating Temperature: From -25°C
• Compliant With BS EN 61008 & IEC1008

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