Key Switch Schneider key switches are manually operated by turning a key. Various switch versions are available enabling the operator to gain a clear visual indication of the switched position and the commands required for the electrical control of equipment. Keys can be removed or may "stay-put" in different positions (switch type dependent). Please refer to the manufacturers datasheet for specific details. Some models have spring return features, that enables the key to activate the switch, then return to the original 'home' key position. Standards IEC, JIS Approvals UL, CSA Schneider Electric ZB5-A (Harmony®) 22mm