Mastervolt Charge Mate Pro 40 Electronic Charge Relay, 40 A

The Mastervolt Charge Mate Pro 40 is an electronic charge relay that connects two battery banks during charging and isolates them while discharging. It limits current to the secondary battery and prioritizes charging the primary battery, helping reduce the risk of a flat starter battery.

• For marine and mobile applications with a charger or alternator
• 40 A maximum output current to the secondary battery; supports two battery outlets
• Unidirectional operation blocks return current; electronic coupling has a maximum voltage drop of 0.2 V
• Input voltage range: 9–32 V; automatic 12/24 V battery voltage detection
• Supports all battery types; lithium-ion protection requires a Multi Purpose contact (product code 77030500)
• Remote switch functions: on, off, auto, and start assist; optional remote switch and LED indicator connections
• LED status and warning monitoring; parallel configuration supported
• IP65 electronics in a corrosion-resistant casing with aluminum heat sinks
• Dimensions: 157 x 140 x 80 mm (6.2 x 5.5 x 3.1 in.); weight: 0.88 kg (1.9 lb)
• Ambient temperature range: -40 to 60 deg C (-40 to 140 deg F); CE approval
• Manufacturer part number: 83304002; UPC: 852968002981

A bypass switch can be connected for emergency starting. A marine example is charging a bow thruster battery alongside a service battery, with charging priority given to the service battery.

California warning: This product can expose you to di(2-ethylhexyl)phthalate (DEHP), known to the State of California to cause cancer and birth defects or other reproductive harm. See P65Warnings.ca.gov for more information.