Holder 45A Black Nickel effect 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. Cooker switch & socket by Holder.