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Snap action contact miniature pressure switches, SPDT contact

Uses: High electrical rating, for 250V .

Main applications: Pressure sensing on water heaters, boilers, and electrical appliances.

SKU: N/A Category: Positive pressure switches

Uses: High electrical rating, for 250V .

Main applications: Pressure sensing on water heaters, boilers, and electrical appliances.

Membranes: EPDM, dia 22 mm. Silicone or NBR on request, Double membrane on request.

Fluid: water or air

Fitting: Plastic or metal

Pressure: positive

Housing: PA66, UL94 VO

Contact: SPDT, snap action. NO or NC contacts available with MOQ

Electrical rating: Depends on microswitch operating force that is linked to the electrical rating

Standard rating micro-switch (medium and high pressure calibration only): 16A 125/250VAC;1/2HP 125VAC;3/4HP 250VAC
High rating micro-switch (medium and high pressure calibration only): 2HP 240V, 21(8) A 240V (UL, CSA VDE switch)
Low force micro-switch (set points less than 150 mbar): 1/4HP 6(1) A 240V ( UL, CSA VDE switch)
On request: up to 25A 250V

Action: momentary.

Set point calibration: factory calibrated and sealed, not field adjustable

Set point calibration limits: from 50 to 1500 mbar

Electrical connection: 6.35 x 0.8 mm quick connect terminals

Maximum pressure: 4 bars (58 PSI)

Ambient temperature limits: 0 to 85°C

Dimensions

Available pressure inlet fittings (1)

* only available for metal fitting

** only available for plastic fitting

Fitting material	Standard rating micro-switch (calibration: 800mbar)	Low force micro-switch (calibration: 150mbar)	High rating micro-switch (calibration 800mbar)
Plastic	ZQ2K28U1UH000000	ZQ2728U50A500000	ZQ2K28U6UH000000
Metal	ZQ2K2RU1UH000000	ZQ272RU50A500000	ZQ2K2RU6UH000000

Differences between air switches and pressure switches
Pressure switches are used to control the pressure of a medium and operate an electrical device. When pressure rises to the set point value, they switch off the equipment or switch on an alarm. Fluid they control can be air or water. There is no barometric or ambient temperature compensation in pressure switches.
Important parameters to select a pressure switch
Accuracy, actuating force and differential are given by membrane surface.
Technical foreword of elastomeric membrane pressure switches
The pressure switches of this catalogue are made according to the flexible elastomeric membrane technology. The pressure applied deforms the membrane which then actuates an electrical contact.