The Everlight 17-21SURC/S530-A3/4T is an electronic part manufactured by Everlight. It is a surface mountable, single pole, single throw (SPST) rocker switch with 3 legs and 4 terminals. It has an off-(on) control mechanism, with a shorting type of circuit. This part is rated for 2A/250V. It has a small size and trouble-free installation.