Voltage regulator / rectifier for excavator throttle controller switch assemblies OE number: 21N8 20506 | Product code: 21N820506 Compatible with: R130, R150, R225, R215, R80 Key benefits Stabilizes voltage and converts AC to DC in the throttle control circuit, keeping throttle signals clean and consistent. Reduces voltage spikes and electrical noise that can cause erratic throttle behavior. Lowers the risk of control module failures and supports longer service life for throttle electronics. OEM-fit design for straightforward replacement and easier maintenance. What it does Provides stable voltage regulation to the throttle controller switch assembly. Rectifies alternating current to direct current so control electronics receive the correct supply. Protects throttle signals and downstream control components from power irregularities. Important attributes Compatibility: Direct fit for throttle controller switch assemblies used on R130, R150, R225, R215, and R80 excavators. Form factor: Standard OEM size for throttle controller assemblies to ensure proper fit and mounting. Construction: Built with robust electrical components designed for heavy-duty use and harsh job-site conditions. Performance: Engineered for consistent throttle response and reliable starting when integrated with compatible controllers. Why you need it Restores stable throttle operation when voltage regulation or rectification has degraded. Helps prevent intermittent or unsafe throttle behavior caused by power spikes or electrical noise. Supports fleet uptime by using an OEM-grade replacement rather than a generic or mismatched unit. Typical applications New installation or retrofit of a throttle controller on R130, R150, R225, R215, or R80 excavators. Electrical system service to replace an aging or failed regulator/rectifier and restore throttle stability. Rebuilds or refurbishments of throttle control subsystems for fleets requiring OEM-compatible parts. Practical notes Confirm compatibility with your specific throttle controller assembly and excavator model before installation. OE 21N8 20506 (product code 21N820506) is intended as a direct replacement to maintain original performance and fit.