Product Description

The Honeywell C437 series comprises industrial-grade gas pressure switches designed for safety shutoff, pressure control, and differential-pressure control in gas systems. These switches utilize MicroSwitch™ snap-action contacts to open or close circuits based on pressure changes, offering both direct- and reverse-acting configurations. Models intended for lockout applications feature a manual reset function, ensuring that the switch cannot resume operation until manually reset. The switches are constructed with Buna-N fiber-reinforced diaphragms for enhanced durability and are housed in a die-cast enclosure with a clear glass cover for visibility of the internal mechanism. They are suitable for various pressure ranges and are commonly used in industrial gas systems for critical safety and control applications.​Ir

Technical Specifications

• Model Types: C437D, C437E, C437F, C437G, C437H, C437J, C437K
• Switch Action: Single-pole, single-throw (SPST); some models include dual SPST circuits
• Pressure Ranges: 1/2 to 5-1/2 in. of water (10 to 140 mm of water, or 0.1 to 1.4 kPa); 1 to 26 in. of water (50 to 700 mm of water, or 0.5 to 7 kPa); 1/2 to 5 psi (300 to 3500 mm of water, or 3 to 35 kPa); 1 to 10 psi (500 to 7000 mm of water, or 5 to 70 kPa)
• Switch Ratings: Varies by model; for example, C437E, G, and H models:
• 120 Vac: Full Load: 8.0 A, Locked Rotor: 48.0 A, Resistive Load: 10.0 A
• 240 Vac: Full Load: 5.1 A, Locked Rotor: 30.6 A, Resistive Load: 5.0 A
• 120 Vdc: Full Load: 2.4 A, Locked Rotor: 24.0 A, Resistive Load: 5.0 A
• 240 Vdc: Full Load: 1.2 A, Locked Rotor: 12.0 A, Resistive Load: 2.0 A
• Enclosure: Die-cast metal with clear glass cover; models available with rainproof, dustproof, sleet- and ice-resistant enclosure (NEMA 3R)
• Diaphragm Material: Buna-N fiber-reinforced for increased strength
• Tamper Resistance: Enclosed setting impedes tampering and provides dust-resistant operation
• Manual Reset: Models intended for lockout applications must be manually reset before resuming operation
• Orifice Compensation: Models with a 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 the inlet pressure channel​