Volvo Penta – 843910 PO2 – Speed Control Module, Adjustable Overspeed Relay

The Volvo Penta 843910 PO2 is an electronic speed control unit designed for marine or industrial engine applications. It monitors engine RPM and features adjustable overspeed protection. This compact module uses a sender input and manages three outputs (S1, S2, S3) for sequential control based on RPM thresholds, with user-adjustable overspeed trip points.

Key Features:

• Model: 843910 PO2

• Function: Speed monitoring and overspeed protection

• Input Voltage: 24 V DC

• Connector: 8-pin (modular plug interface)

• Outputs:

 – S1 opens at >5 r/s engine speed

 – S2 closes 5 seconds after S1 opens

 – S3 closes at user-adjustable overspeed threshold (range: 26–45 r/s)

• Control: Manual speed adjust dial

• Housing: Plug-in module with metal clip bracket

• Application: Marine engine control, generator overspeed protection, automation safety