The NewMar PT-MCU Monitor Control Unit is a Phase Three charger monitor and control unit and is designed to be used with many of the Phase Three charger models available that accept the optional battery temperature compensation sensor (TCS 12/24). The PT-MCU enhances the functionality of your charger systems by providing additional monitoring, controls, and alarms.

The PT-MCU comes with a 10 foot wiring harness for AC input and DC monitor wiring to the charger. Its anodized aluminum case and heavy duty mounting flanges ensure safe and secure installation, adding yet another layer of reliability to the entire Phase Three concept.

https://www.newmarpower.com/wp-content/uploads/2017/06/Phase-Three-Monitor-Control_Unit_Model-PT-MCU-Newmar-DC-Power-Onboard-Manual-PTMCU-051915.pdf