The thermostat must be protected by a 16 A circuit breaker (fuse) on the power cord. When circuit breakers are installed in Ex-classified areas, ATEX certified circuit breakers must be used. The electrical connection to the heater must be made through a circuit breaker, max. 16 A and the connectors are installed inside the enclosure. The Series TEF502392xx ambient air thermostat must be used as an ambient air sensing working thermostat mounted in an ATEX certified Ex e housing or enclosure for safety areas. – Small size – Local 16 A digital contacts – Easy to install