The Dungs 266928 (GMH-A4-4-6), formerly 217-327A, is an SPDT gas pressure switch that operates at 120 VAC power supply. It has a factory setting range of 12 to 60" W.C. and a maximum pressure capacity of 7 psi. CSA Certified, FM Approved, and UL Recognized.
This device is constructed with an aluminum housing, a polycarbonate switch, and an NBR-based rubber diaphragm with a manual reset. It features a field-adjustable set point using a dial with an integrated scale, allowing it to make or break a circuit based on changes in gas pressure.
The 266928 is designed for automatic gas-burning equipment controls used in industrial and commercial applications with a 1/4" NPT pipe connection and requires no auxiliary power. Suitable for natural gas, propane, butane, air, and other inert gases. Intended for pipe-mounted installations.
Note: A neon light illuminates to indicate when the switch has tripped after the set point is exceeded.
| Switch Type | SPDT |
|---|---|
| Electrical Connection | 1/2” NPT Conduit Connection via Screw Terminals |
| Maximum Operating Pressure | 7 psi (500 mbar) |
| Factory Setting Range | 12 to 60” W.C. |
| Enclosure Rating | NEMA Type 4 |
| Contact Rating | 10A Resistive/8A Inductive at 120 VAC |
| Pipe Connection | 1/4" NPT |
| Operating Temperature Range | -40 to 140°F (-40 to 60°C) |
| Voltage | 120 VAC |
| Switching Contact | Silver (Ag) |
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-12-to-60-inch-WC-1.png "Dungs 266928 Gas Pressure Switch (GMH-A4-4-6) 12 to 60” W.C.")