Hobbs Pressure Switch 5 Psi vs 15 Psi for Fuel Systems

Quick answer

Choose the 5 psi Hobbs switch if you need to trigger a circuit at low system pressure, or the 15 psi model if your application requires a higher activation threshold. Both use 1/8th NPT threads and include a pigtail for easy wiring.

5 psi vs 15 psi tradeoffs

• Actuation point: 5 psi triggers at a lower pressure; 15 psi requires more system pressure before switching. Match actuation to the normal operating pressure of your system.
• Typical use: 5 psi works well for low-pressure monitoring or early warning indicators. 15 psi is better for systems that need a higher threshold before activating a control circuit.
• Electrical compatibility: Both models have a 0.5A rating, so they are limited to low-power circuits. Do not use them to directly control high-current loads. Use a relay if your load exceeds 0.5A.

Product facts

• 1/8th NPT 5 Psi Hobbs Switch with Pigtail: The DeatschWerks Hobbs Switch triggers at 5 psi and has a 0.5A electrical rating. It suits applications that need a low-pressure activation point, such as monitoring fuel system priming or low-pressure alarms.

  

• 1/8th NPT 15 Psi Hobbs Switch with Pigtail: The DeatschWerks 15 psi Hobbs Switch also features a 0.5A rating and 1/8th NPT thread. It provides a higher threshold for circuits that should only activate once pressure builds further, reducing nuisance cycling.

  

Which one fits your system?

Best for

• Fuel systems that need a low-pressure trigger (e.g., priming indication or low-pressure alarm) → 5 psi switch
• Applications requiring a higher activation threshold to avoid false triggers → 15 psi switch

Not for

• High-current loads above 0.5A without a relay
• Systems requiring a pressure switch with a different thread size or electrical rating