Nexus 45A Single Switched Cooker switch & socket. For your safety, electrical products must be installed in accordance with local building regulations. If in any doubt, or where required by the law, consult a competent person who is registered with an electrical self-certification scheme.. This 45A cooker switch & socket is intended for kitchen use and allows for the isolation of hardwired cookers. It features an neon indicator and an additional plug socket for use with other appliances. Cooker switch & socket by Nexus.