Ansi Engineers

Danfoss pressure switches are mechanical/electromechanical controls designed to sense and respond to changes in fluid or gas pressure by opening or closing an electrical contact when a preset pressure level is reached. They are widely used in refrigeration, air conditioning, industrial machinery, compressor protection, pump control, boiler systems, and general automation safety circuits.

Danfoss KP Series pressure switches are engineered mainly for refrigeration and air conditioning applications but also apply to general industrial pressure control tasks. These switches help protect systems against excessively low suction pressure or excessively high discharge pressure, and they are frequently used to start/stop compressors, fans, pumps or provide safety interlock functions.

Key Features

• SPDT Switch Contact: Single‑pole changeover output for simple on/off control.

• Pressure Regulation: Adjustable or fixed setpoints to monitor and control pressure ranges typically from low to mid pressures (e.g., –0.2 to ~32 bar).

• Robust Design: Metal bellows pressure sensing element with vibration and shock resistance.

• Enclosure Options: Available with IP30, IP44 or IP55 protection for indoor or outdoor use.

• Reliable Operation: Snap‑action contact boosts reliability with ultra‑short bounce times and low mechanical wear.

• Manual/Auto Reset: Some models include manual reset for safety limit applications and auto reset for control functions.

• Wide Temperature & Media Suitability: Works with refrigerants, air and many gaseous media; typical media temp –50 °C to 100 °C.

Common Uses
• Protection against high discharge/low suction in refrigeration systems.
• Compressor control and fan cycling in air‑cooled condensers.
• Safety cut‑offs and alarms in industrial machines

The RT Series from Danfoss consists of pressure switches and related controls developed for general industrial use, including marine, boiler safety and automation systems. These switches typically feature a pressure‑controlled contact where the switching position depends on pressure relative to a preset value.

Key Features

• SPDT Contact Output: Reliable single‑pole changeover switch similar to KP but designed for more general industrial environments.

• Broader Pressure Options: Able to handle a wider range of pressures that suit industrial pipelines, pumps, compressors and safety cutouts.

• Differential & Neutral Zone Models: Includes differential pressure switches and neutral zone regulation versions for precise control.

• Fail‑Safe & Gold‑Plated Contacts: Some versions offer enhanced reliability and suitability for low‑current or few‑cycle applications.

• Industrial & Marine Capability: Suitable for heavy‑duty machinery and marine applications given robust housing and performance.

Common Uses
• Pump and compressor monitoring in industrial process control.
• Boiler safety and steam systems where pressure monitoring is critical.
• General industrial pressure control in hydraulics and pneumatic systems.