RANCO DUAL 17-R4759 HD SERIES pressure switch
The Ranco 17-R4759 HD Series is a dual high/low pressure switch with automatic reset on LP and manual reset on HP, ideal for compressor protection in refrigeration and HVAC systems.
It is compatible with the Ranco O17H / O17 HD series (O17H4759 and equivalent variants) and is used as a direct replacement in cold rooms, commercial refrigeration, heat pumps and industrial systems.
Description
The Ranco O17-R4759 HD Series is a dual safety pressure switch designed to monitor pressure in refrigeration circuits. It manages both low and high pressure, ensuring compressor protection in the event of malfunctions.
The version with automatic reset on LP and manual on HP offers a higher level of safety, requiring the system to be checked before resetting in the event of overpressure.
The Heavy Duty (HD) structure ensures high reliability and resistance even in intensive working conditions, making it suitable for professional and industrial systems.
TECHNICAL FEATURES:
- Type: double pressure switch (LP + HP)
- Series: HD (Heavy Duty)
- Codes: O17-R4759 / O17-R4759-086
- LP Reset: Automatic
- HP Reset: Manual
- LP range: -0.3 ÷ 7 bar
- LP Differential: 1 ÷ 5 bar
- HP range: 6 ÷ 32 bar
- HP Differential: 5 bar
- Connection: 1/4” SAE
- Contacts: SPDT
- Application: refrigeration, HVAC, heat pumps
- Refrigerants: HFC / HCFC
- Certification: PED
- Use: commercial and industrial refrigeration systems
ADVANTAGES:
- Greater safety with manual reset on high pressure
- Complete compressor protection
- Robust HD series construction
- Wide compatibility with HVAC systems
- Ideal for continuous professional use
Professional and reliable solution to ensure maximum safety and operational continuity in refrigeration and air conditioning systems.

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