Transform your generator’s control system with the SDMO APM303 Digital Control Panel Retrofit Kit (P/N 31613621303NE). Designed for SDMO generator sets under 300 kVA, this kit provides advanced instrumentation, straightforward setup, and modern communication capabilities—making it a top choice for retrofitting older systems.

What’s Included in the Retrofit Kit?

Every APM303 Retrofit Kit from Ace Power Products includes:

• APM303 Controller (31613629300)
  
• Back Plate with E-STOP & Key Switch (GP41234888)
  
• Main Harness (31607712001)
  
• Voltage Reference Wiring Harness (31613621501NE)
  
• Charging Alternator Input Inhibition Harnesses for Mitsubishi/Lombardini/KDW Engines (31607717301, 31607718701)
  
• Alarm Excitation Harness for John Deere Engines (31614335401NE)
  
  

Each kit arrives factory-programmed to your specific generator—just provide genset model, voltage, phases, and CTs.

Key Features & Benefits

Reliable and High-Quality Design

• Made in France, fully factory-tested, and backed by a 1-year international warranty—not made in China.
  

Modern Control and Monitoring

• Operates on 12V or 24V, with AUTO & MAN modes for flexible operations.
  
• Features a user-friendly IP54-rated LCD screen for rugged environments.
  
• Advanced diagnostics with event logging (up to 12 events) and Modbus RTU communication for remote monitoring.
  

Enhanced Protection

• Built-in safeguards against min/max voltage and frequency, short circuits, and overloads—improving safety and reliability.
  

Seamless Retrofitting

• Easily replaces older Nexys control systems, using the same console layout while modernizing your generator’s control interface.
   

Why the APM303 Retrofit Kit Is a Smart Upgrade

Enhanced Generator Control

Gain better visibility into voltage, current, alarms, and system status with intuitive controls and remote flexibility—especially helpful in emergency power setups.

Future-Proof and Configurable

With PC configurability, Modbus communication, and flexible voltage support, the APM303 evolves with your system's needs, not against them.

Easy to Use and Maintain

Safety features like emergency stop and MAN/AUTO modes, paired with a straightforward interface, simplify setup and operation—even for less technical users.

Best Use Cases for the APM303 Retrofit Kit

• Upgrading legacy SDMO gensets under 300 kVA with outdated Nexys panels
  
• Enhancing reliability and monitoring in power-critical environments (e.g., healthcare, telecom)
  
• Adding remote monitoring and communication via Modbus
  
• Upgrading cold-weather applications with post-heating functionality
  

Ready to Upgrade? Here’s How to Get Started

• Provide your generator specifications (model, voltage, phases, CTs) for customization.
  
• Visit our product page to place your order or view more details.
  
• Or call us directly at 1‑(561) 317‑4154 to speak with a specialist today.
  

Looking for other generator parts? Explore our range on the homepage for solutions across AC alternators, AVRs, Kubota parts, and more.

Upgrade your generator’s control system with confidence. The SDMO APM303 Retrofit Kit offers modern controls, increased safety, and dependable performance—perfect for today’s demanding applications.