Hager RCD 40A Type F 30mA Single Pole & Neutral CDF540U

Hager CDF540U: 40A 30mA 1 Pole + Neutral RCCB Type F with a trip-free mechanism for reliable protection against earth faults.

Safety & Reliability

This residual current circuit breaker (RCCB) automatically opens the circuit the moment it detects a fault current between line and earth, or neutral and earth, cutting power before it becomes dangerous. The Type F rating means it responds correctly to the mixed AC and pulsating DC fault currents produced by electronic loads such as variable speed drives, heat pumps, and inverter-fed equipment, giving you confidence on installations where a standard Type A device would fall short.

A trip-free mechanism is built in as standard, so the contacts cannot be held closed against a fault condition by force on the operating handle. That's a key safety guarantee for anyone maintaining or testing the circuit.

Clear Status Indication

A rectangular flag indicator shows contact position at a glance: red for closed, green for open. A separate yellow flag confirms when the device has tripped, so engineers can identify a fault condition quickly without needing test equipment, cutting diagnostic time on site.

Installation & Compliance

Terminal capacities of 25mm² rigid or 16mm² flexible cover the 16 to 63A range this RCCB sits within, making it straightforward to wire into standard distribution boards and enclosures. The unit conforms to BS EN 61008 and IEC1008, so it meets the recognised standards inspectors and building control will expect to see on a residual current circuit breaker installation.

For locations where the RCCB needs to be locked in an on or off position, for example during maintenance or isolation procedures, it accepts a Hager MZN175 padlocking accessory, adding a physical layer of access control on top of the electrical protection.

Key Features of the Hager CDF540U Include:

• Automatic Disconnection On Earth Fault Between Line/Earth Or Neutral/Earth
• Type F Rating Suits Mixed AC & Pulsating DC Fault Currents From Electronic Loads
• Trip-Free Mechanism Prevents Contacts Being Held Closed Against A Fault
• Flag Indicator Shows Contact Position: Red = Closed, Green = Open
• Yellow Flag Indicator Confirms Tripped Status For Fast Fault Diagnosis
• Padlockable On Or Off Using MZN175 Accessory For Safe Isolation
• Rated Current: 40A
• Residual Current Sensitivity: 30mA
• Configuration: 1 Pole + Neutral
• Terminal Capacity: 25mm² Rigid, 16mm² Flexible
• Complies With BS EN 61008 & IEC1008
• Manufacturer: Hager Ltd

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.