Jumo India Pvt Ltd offers Surface-Mounting Single or Twin Thermostats. Jumo India Pvt Ltd is DIN EN ISO 9001 and DIN EN ISO 14001 certified company. Surface-Mounting Single or Twin Thermostats is marketed as "Surface-mounting single or twin thermostats [TW/STW/STB], Series ATH-SW". It consist of one or two separate measuring and switching systems and can be supplied as temperature monitors TW, safety temperature monitors STW [STB] and safety temperature limiters STB. In fault condition, the STB sets the system being monitored to a safe operational state. The Surface-Mounting Single or Twin Thermostats operate on the principle of liquid expansion, with a micro-switch serving as the electrical switching device.