Datasheet 2021 Panel-mounted Thermostats, EM SeriesThermostats control and monitor thermal processes. The devices of the EM series are available as temperature controllers TR, temperature monitors TW, temperature limiters TB, safety temperature monitors STW (STB), and safety temperature limiters STB. In the event of a malfunction, the STB switches the monitored machine to a safe operating status.Panel-mounted thermostats operate according to the fluid expansion principle – a microswitch is used as an electrical switching element.Features • Temperature controller TR and temperature monitor TW• Safety temperature limiter STB• Tested according to DIN EN 14597• Pressure Equipment Directive 97/23/EC