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20PS-0.4 Pressure Switch - R1/8-28 Male, 0.4MPa OFF/0.2MPa ON (Wired)

Model: 20PS-0.4; Thread: R1/8-28 Male; Switch points: OFF=0.4MPa, ON=0.2MPa; Connection: Wired; Working pressure: Low-pressure grade; Temp range: Ambient -30°C~+80°C, Medium -50°C~+120°C; Electrical rating: 125VA (24Vac), 375VA (120/240Vac); Life cycles: 30k/50k/100k optional; Burst pressure: 5000PSI.

Model:
20PS-0.4 Pressure Switch
Brand:
SHINE
Code:
20221156


Availability:



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Product Description

20PS-0.4 Pressure Switch (Wired, R1/8-28 Male)

A compact and reliable low-pressure control device, the 20PS-0.4 is engineered for precise pressure switching with an R1/8-28 male thread and wired connection. It’s tailored to meet the low-pressure protection needs of HVAC systems, refrigeration equipment, and small industrial machinery, combining practical design and stable performance.

Core Advantages

Precise low-pressure protection: Triggers OFF at 0.4MPa to prevent overpressure and auto-resets ON at 0.2MPa, ensuring timely system protection and recovery.
Easy installation & use: R1/8-28 male thread enables quick connection to standard pipelines, while the wired design ensures stable electrical transmission. Factory-pre-set parameters eliminate on-site adjustment.
Durable & adaptable: Sealed structural design enhances leak-proof performance, with wide temperature tolerance (-30°C~+80°C ambient) to suit diverse working environments.

Key Specification Table

Parameter	Details
Model	20PS-0.4
Thread Interface	R1/8-28 Male
Switch Action Points	OFF: 0.4MPa; ON: 0.2MPa
Connection Type	Wired
Operating Temperature	Ambient: -30°C~+80°C; Medium: -50°C~+120°C
Electrical Capacity	125VA (24Vac); 375VA (120/240Vac)
Service Life Cycles	30,000/50,000/100,000 times (optional)
Burst Pressure	5000PSI

Working Principle

Built with an internal reversible stainless steel diaphragm. When system pressure reaches 0.4MPa, the diaphragm flips to disconnect the switch (OFF), avoiding overpressure damage. As pressure drops to 0.2MPa, the diaphragm automatically resets, re-engaging the switch (ON) to restore system operation—achieving seamless auto-control without manual intervention.

Application

Key Application Scenarios

HVAC & Refrigeration Systems

Perfect for small to medium-sized air conditioning units, household refrigerators, and commercial display freezers. The R1/8-28 male thread fits compact low-pressure pipelines, protecting compressors from damage caused by pressure fluctuations. The wired connection ensures stable signal transmission, maintaining consistent cooling efficiency for daily and commercial use.

Small Industrial & Precision Equipment

Suitable for low-pressure pneumatic tools, small hydraulic systems, lubrication circuits, and laboratory precision equipment. Widely used in light manufacturing, electronic assembly, and automotive maintenance. Its compact size, reliable switching, and wide temperature adaptability make it ideal for scenarios requiring precise low-pressure control in limited installation spaces.