The Danfoss RT121 pressure switch is a mechanical pressure switch designed for reliable monitoring and switching at low pressures in refrigeration, air-conditioning and industrial applications. It offers a control range of -1...0 bar, an SPDT contact and automatic reset, making it suitable for installations where simple and robust pressure control is required. The unit is fitted with a G 3/8" female threaded pressure connection and durable IP66 protection for safe operation even in more demanding conditions. The bellows design and wide ambient temperature range support its use in technical installations where long-term reliability and stable operation are essential.