Temperature controller with changeover contact and central piece R.1/R.3, polar white, glossy. Room temperature controller with changeover contact and central piece with print, control knob with temperature range limitation. For heating or cooling operation, e.g. for actuators closed when de-energized, with thermal feedback, without spreading claws, with plug-in terminals, neutral conductor required, when the set temperature is reached, the contact changes. Flush-mounted installation, standard range. Material: plastic, thermoplastic, shatterproof, halogen-free.