The SMJ Inline RCD Adapter (circuit breaker) protects against the risk of electrocution and is approved to the latest European standards. Double pole protected. Essential for use in high risk areas such as outdoors, by ponds and when using pressure washers. You should use an RCD whenever working with any electrical device. When an imbalance is detected the SMJ RCD cuts power faster than a heartbeat. It is designed to be installed in a cable run to provide portable and permanently fixed protection. One end goes into the mains, then you plug your electrical appliance into the other end. If there is a fault or a short in the tool you are using, the unit cuts the power very quickly, reducing the risk of electrocution and is approved to the latest European standards. It continuously monitors the power supply to an electrical appliance and cuts off the power within 40 milliseconds if an earth current fault is detected. This is fast enough to prevent a fatal electric shock. The SMJ RCD Safety in-line adaptor is an ideal way to protect yourself when using portable electrical tools, like lawnmowers, hedge trimmers and mains powered drills. Electrical appliances can become dangerous if the wiring becomes loose, or their power cords become damaged or if they get wet. Not only power tools and lawnmowers can cause electrocution is also possible if fingers, wet hair or other conductive bodies enter the appliance. Essential for use in high risk areas such as outdoors, ponds and pressure washers etc. In all these cases the SMJ Safety RCD is a must. Not for use on ponds as when disconnected the protection will be lost. Particularly recommended for use with power tools. Can be used with any 240 Volt appliance.