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Pressure Switch, Manual Reset, 1/2 psi to 5 psi


Pressure Switch, Manual Reset, 1/2 psi to 5 psi

This product is no longer available for purchase.

  • Product Info
  • Literature


C437D,E Series 2000 Gas Pressure Switches are pressure-actuated devices used in industrial gas systems for safety shutoff. Series 2000 models have snap acting MicroSwitch™ snap switches to open a circuit on pressure rise or drop.


  • C437 models have direct- and reverse-acting SPST (non-mercury) switching.
  • Models intended for lockout applications must be manually reset before resuming operation.
  • Models with pressure range of 1 to 26 in. wc (0.25 to 6.5 kPa)compensate for momentary surges in gas pressure with a restrictive orifice in inlet pressure channel.
  • Impede tampering and provide dust-resistant operation with enclosed setting.
  • Increase strength of control diaphragm with Buna N fiber-reinforced material.
  • Two Buna-N fiber-reinforced seal-off diaphragms for added reliability.
  • Clear glass cover allows observation of interior mechanism to aid in setting and checkout.

Product Specifications

Industrial gas system applications for safety shutoff, pressure control, or differential-pressure control.
Dimensions (in.)
7 3/4 in. high x 6 1/4 in. wide x 3 7/16 in. deep
Dimensions (mm)
197 mm high x 159 mm wide x 87 mm deep
Case: Die-cast aluminum
Approvals, Underwriters Laboratories Inc.
Listed: File No. MP2168, Guide No. MFHX
Approvals, Canadian Standards Association
Certified: File No. LR1620, Guide No. 380-W-1.16
Electrical Connections
Screw terminals
Temperature Ratings (C)
52 C - Maximum Ambient
Temperature Ratings (F)
125 F - Maximum Ambient
Contact Ratings
120 Vac Switch Contact-- 8.0 AFL, 48.0 ALR, 10.0 A resistive; 240 Vac Switch Contact-- 5.1 AFL, 30.6 ALR, 5.0 A resistive
Operating Temperature Range (F)
32 F to 125 F
Operating Temperature Range (C)
0 C to 52 C
Approvals, Swiss RE
Approvals, Factory Mutual
Approved: Report No. 22018, 24127, J.I.IF4A3.AF
Sensor Element
BUNA N Diaphragm
Operating Range (psi)
1/2 to 5 psi; 15.0 psi - Maximum Sustained
Operating Range (kPa)
3.0 to 35 kPa; 103.4 kPa - Maximum Sustained
Differential Pressure Range (psi)
1/2 psi
Differential Pressure Range (kPa)
3.45 kPa
Differential Type
Switch Operation
Manual Reset
Switching Action
SPST, break on rise, non-mercury
Pipe Connection
Main or High Pressure--1/2 in. NPT internal thread; Vent or Low pressure--1/8 in. NPT internal thread