Temperature controller with changeover contact and central piece R.1/R.3, black, 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.