Descriptions:2NC-2NO contact type, key lock rotary selector action, 19mm panel cutout diameter.Button locking when rotary, rotary again the key to reset.1 Positions can pull out the key.Used widely to control the electromagnetic start, contactor, relay and other automatic control electric circuits.Features:Rated Current & Voltage: AC 250V/0.5ALight Voltage: No Light Include;Model: S2803Position: 2Operation Type: Locking;Contact Type: 2NC-2NOMounting Hole Dia: 19mm / 0.74"Total Size: 37*25mm (H*D)Material：Copper Chrome PlatingTerminal： 4 PinsTerminal type: WeldedPackage Content:1 x Key Push Button Switch / 2 x Keys .