Thermal cut out. L200-25.
Therm-O-Disc 36TX21 13039 L200-25
Thermostat, thermal cut out. L200-25 Bi-metal - 1/2" (12.77mm). Mounted on flange with 15/16" centers NC opens on temp increase. The 36T series offers proven reliability in a compact, versatile, cost-effective design. The snap action of the bi-metal disc provides high-speed contact separation resulting in excellent life cycle characteristics at electrical loads up to 15 amps at 120VAC and 10 amps at 250VAC. Package: 1/2" (12.77mm), solder terminals. Please see: http://electronicsurplusblog.com/replacing-thermal-cutout-devices-with-surplus-look-alikes/