Danfoss 017-521566 RT121 Pressure Switch

The Danfoss 017-521566 RT121 Pressure Switch is a heavy-duty single pressure control designed for industrial refrigeration and general process monitoring. Engineered with a changeover switch (SPDT), this unit offers reliable performance in both plant automation and safety alarm circuits. It features a regulating range of -1 to 0 bar (-14.5 to 0 psig), making it an ideal choice for low-pressure applications requiring precise setpoint accuracy. The RT121 series utilizes a bellows system designed to withstand the rigors of harsh environments, ensuring stable contact operation even under vibration or pressure pulsations. This control is compatible with all common fluorinated refrigerants and is frequently implemented in commercial HVACR systems for suction line regulation. With its robust IP66 enclosure rating and G 3/8 A pressure connection, the RT121 provides technicians with a durable, field-proven solution for maintaining optimal system pressures and equipment safety.

• Adjustable Differential: Offers a mechanical differential range of 0.09 to 0.4 bar for precise equipment cycling.
• High Enclosure Rating: IP66-rated housing protects internal bellows and silver contacts from dust and moisture ingress.
• Universal Compatibility: Suitable for use with CFC, HCFC, and HFC refrigerants in diverse industrial settings.
• Manual or Automatic Reset: Designed for versatility in safety cut-out or regulating applications.
• Ambient Temperature Range: Rated for operation between -50°C to 70°C, accommodating extreme mechanical room conditions.

What is the maximum working pressure for the RT121?
The RT121 is designed for low-pressure monitoring with a maximum working pressure (PS) of 7 bar and a maximum test pressure of 8 bar.

Can this switch be used for both pump-down and high-pressure cutout?
The RT121 is specifically designed for low-pressure ranges. While the SPDT contact allows for various wiring configurations, it is most commonly used for low-pressure regulation or vacuum control.

What are the electrical ratings for the contacts?
The internal SPDT switch is rated for an AC-1 (ohmic) load of 10A 400V and an AC-15 (inductive) load of 3A 400V, providing heavy-duty switching capacity without external relays in many applications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.