The S3010-1 Oil Pressure Switch is an engine oil pressure-activated switch used in Cessna aircraft to control systems such as the hour meter (Hobbs meter) or warning circuits. It operates by closing or opening an electrical circuit when a preset oil pressure is reached, allowing the system to detect when the engine is running.

This switch is typically installed in the engine oil system and is used to:

activate the hour meter when oil pressure rises (engine running)
provide input for low oil pressure indication systems
ensure automatic and accurate engine time recording
It is a simple mechanical pressure switch with electrical contacts, designed for reliable operation under vibration, temperature changes, and oil exposure, making it a critical support component for engine monitoring and maintenance tracking.