The WMPS3PI features a unique patented LOOP terminal to allow neutral looping at the switch. For multi-gang switch use of a 25mm mounting box will provide increased wiring space. The high-quality face plates provide resistance to impact and heat for maximum robustness and it has been independently tested and certified. The moulded lead-ins help to guide the driver blade to the screw head and a positive wire end stop provides added security of connection.