What the Oil Pressure Shutdown Switch does
The low oil pressure switch is the engine's last line of defence. If oil pressure falls — from low oil, a pump fault or a leak — it trips the controller to stop the engine before the bearings are destroyed.
A faulty switch either trips falsely, shutting down a healthy generator during an outage, or fails to trip when it should. Both are serious on a critical standby set.
Signs it needs replacing
- Low oil pressure shutdowns with the oil level correct.
- The set will not start because the controller sees a fault.
- Oil leaking from the switch.
Get the right part first time
Send us these on WhatsApp and our engineers will confirm the exact part before you pay:
- Thread, contact type (normally open/closed) and trip pressure of your current switch.
- A clear photo of the old part, including any label, stamping or part number on it.
Fitting notes
Confirm the engine's real oil pressure with a mechanical test gauge before blaming the switch — a genuine low-pressure fault must never be bypassed. Fit with suitable thread sealant and test that the shutdown actually operates.
Frequently asked questions
Can I bypass the switch to keep the generator running?+
No. If oil pressure is genuinely low, running on will destroy the engine. Confirm the pressure with a gauge first.
What trip pressure do I need?+
The one specified for your engine — the switch is matched to the engine and panel.
How is it tested?+
By checking the contact changes state at the right pressure, and by confirming the controller shuts the engine down when it trips.