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Pressure Switch, Manual Reset, 1/2 in. wc to 5 1/2 in. wc


Pressure Switch, Manual Reset, 1/2 in. wc to 5 1/2 in. wc

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)
0.5 to 5.5 in. wc; 3.0 psi - Maximum Sustained
Operating Range (kPa)
0.1 to 1.4 kPa; 20.7 kPa - Maximum Sustained
Differential Pressure Range (psi)
0.25 in. wc
Differential Pressure Range (kPa)
0.06 kPa
Differential Type
Switch Operation
Manual Reset
Switching Action
SPST, Break on Fall, non mercury
Pipe Connection
Main or High Pressure--1/2 in. NPT internal thread; Vent or Low pressure--1/8 in. NPT internal thread