Master Relay 111-226 12V is an aircraft electrical switching component designed to control the main power connection between the aircraft battery and electrical distribution system. This heavy-duty relay provides reliable switching of high-current battery power while allowing cockpit controls to safely manage electrical system activation.

The master relay operates as an electrically controlled switch, closing the main battery circuit when the aircraft electrical system is activated and isolating battery power when the system is turned off. This function reduces the load carried by cockpit switches and provides efficient control of the aircraft's primary electrical supply.

Designed for general aviation applications, the 111-226 12V master relay features robust construction suitable for vibration, temperature variations, and demanding aircraft operating environments. Reliable relay operation is essential for proper electrical system performance, including powering avionics, lighting, instrumentation, and other onboard equipment.

Routine maintenance should include inspection of electrical terminals, mounting security, corrosion, proper voltage operation, and evidence of contact wear or overheating. Replacement of worn or malfunctioning relays helps maintain dependable aircraft electrical system operation.

Key Features

- Part Number: 111-226
- Manufacturer: Master Relay
- Component: Master Relay
- Voltage: 12V electrical system
- Application: Aircraft battery and main electrical power switching
- Provides reliable high-current circuit control
- Reduces electrical load on cockpit master switches
- Designed for vibration-resistant aircraft installation environments
- Supports dependable operation of aircraft electrical distribution systems