The Philmore Mfg. 30-111 is a Round Miniature Push Button Switch with a SPST configuration. It has a 3A current rating at 125V AC and 1A at 250V AC. The initial contact resistance is DC 2.5-1A and the insulation resistance is 500V DC 100 Meg ohm (Min.). Its dielectric strength is 1500V AC for 1 minute and it is made with brass-silver plated contacts and terminals. The actuator is a round black nylon and the mounting hole is 0.406".