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Phase Three Charger Monitor/Control Unit

Newmar DC Power Onboard Phase Three Monitor and Control Unit for Marine Applications

Model PT-MCU

Designed for installation in conjunction with most models of PT Battery Chargers, this unit provides additional functionality of monitoring, control, and alarms. It contains a Digital DC volt meter with 3 battery bank sense selector, a dial that adjusts the PT charger float voltage, and AC Master circuit breaker for control and protection of charger input power.

A 10 foot wiring harness is provided for AC input and DC monitor wiring to the charger.

Download Manual (PDF)


  • Digital readout of 3 battery bank voltages to 1/10th volt
  • Adjustable DC high/low voltage alarm
  • Output float voltage adjustment pot; permits fine tuning from -4% to +5%
  • AC circuit breaker (30A, double pole) provides overcurrent protection and manual disconnect
  • AC power ON indicator light
  • 10′ wiring harness for easy connection of PT Series Charger
  • Compatible with: PT-14W, PT-25W, PT-40U, PT-80, PT-24-8W, PT-24-13W, PT-24-20U, PT-24-45U, PT-24-95U, and PTMS-24-67


  • 120 or 240 VAC AC failure contact
  • Relay for DCV remote alarms (model DIR)
  • Harness to length


  • Anodized aluminum case
  • Heavy duty top and bottom mounting flanges
  • Waterproof wire cord grips
  • Case Size (H x D x W) Inches: 8.7 x 4.6 x 5.5 Centimeters: 22.1 x 11.6 x 14
  • Weight (Lbs./Kg.): 5.5/1.6

PT-MCU – PT Charger Interface Typical Wiring Configuration