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    • Mastervolt Charge Mate Pro 40  Electronics Charge Relay 83304002
    • Mastervolt Charge Mate Pro 40  Electronics Charge Relay 83304002
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    Mastervolt Charge Mate Pro 40 - Electronics Charge Relay [83304002]

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    Sale Price $215.99 Regular Price $342.99
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    Charge Mate Pro 40 - Electronics Charge Relay

    Current limited electronic charge relay with high efficiency and reverse current protection

    A secondary battery on board requires a dedicated charging solution. The Charge Mate Pro makes it possible to distribute the charger or alternator current effectively between two battery banks such as a starter and a service battery. The Charge Mate Pro connects both batteries during charging and keeps them isolated when discharging. This significantly reduces the risk of a flat starter battery for example.

    The Charge Mate Pro offers an additional advantage over mechanical charge relays, by limiting the charge current to the second battery. The primary battery, like a starter battery, is therefore charged with priority. The return current is automatically blocked even when the secondary battery has a higher voltage. An emergency start function is possible by connecting an optional bypass switch to the Charge Master Pro.

    A marine application example is the connection of a bow thruster battery to a service battery. The Charge Mate Pro ensures that the service battery is always charged with priority. The blocking of the return current from the bow thruster battery guarantees that the bow battery remains charged while the current limiting also prevents power dips of the onboard electrical network.

    The Charge Mate Pro series consist of a 40 Amp and a 90 Amp version, both suitable for charger or alternator applications.

    Charge Mate Pro: for controlled charging from a single source.

    Applications

    • Leisure and professional marine and mobile applications. An effective solution for high power demand on board and/or the need of prioritised or current limited charging.

    Features

    • Electronic charge coupling with very low voltage drop
    • Makes effective dual charging possible
    • Suitable for all battery types, including Lithium Ion
    • Charge current secondary battery limited to 40 A
    • High system reliability by prioritised charging of the main battery
    • Unidirectional which blocks return current under all circumstances
    • Prevents power dips of the onboard electrical network
    • Suitable for all kinds of chargers and alternators
    • Monitoring with LED status indication
    • IP65 electronics in a corrosion resistant casing with aluminum heat sinks
    • Fast and easy installation

    General specifications

    • Remote switch functions:  on, off, auto, start assist
    • Monitoring: LED (warnings and status indication)
    • Output current: limited to 40 A
    • Number of battery outlets: 2
    • Input voltage range: 9-32 V
    • Parallel configuration: yes
    • Battery voltage: automatic 12/24 V detection
    • Dimensions, hxwxd: 157 x 140 x 80 mm / 6.2" x 5.5" x 3.1"
    • Weight: 0.88 kg / 1.9 lb
    • Approvals: CE

    Technical specifications

    • Connection possibilities: 3 x fast-on connectors (switch, ground and status) o switch: for an optional single pole ON-OFF-ON switch for remote operation o status: for an optional LED indicator
    • Power consumption: switch open: < 1 mA at 12/24 V DC
    • Battery types: all types (Lithium Ion protection via Multi purpose contact, product code 77030500)
    • Switch on voltage: 13.5 V (12 V) / 27 V (24 V)
    • Switch on delay: 5 sec.
    • Switch off voltage: 12.75 V (12 V) / 25.5 V (24 V)
    • Switch off delay: 2.5 sec.
    • Relay: electronically (mosfets with low voltage drop of max 0.2 V)
    • Temperature range (ambient temp.): -40 °C to 60 °C -40 to 140 °F
    • Protection degree: IP65

    WarningWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.


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    Service & Support

    Warranty

    This product is backed by a 12-month limited warranty, covering defects in materials and workmanship under normal use.

    Technical Assistance

    Our dedicated support team is available to assist with product setup, operation guidance, and troubleshooting. Contact us via email or phone for prompt service.

    Documentation & Downloads

    Access essential resources including the user manual, technical specifications, and safety instructions in our online support center.

    Replacement Parts & Accessories

    We offer a full range of genuine replacement parts, including batteries, chargers, and compatible accessories to ensure long-term performance.

    Training & Tutorials

    Browse our library of how-to videos and maintenance tips to get the most out of your cordless drill.

    FAQs

    Find quick answers to common questions

    Product & Usage

    1. Are KRANK tools built for professional use?

    Yes, all our tools are engineered for heavy-duty performance and long-term reliability.

    2. Are KRANK tools safe to use for beginners?

    Yes, our tools are designed with safety features and easy handling in mind.

    3. Can KRANK tools be used in extreme conditions?

    Yes, they are tested to perform reliably in demanding environments.

    Maintenance & Accessories

    1. What maintenance is required for the tools?

    Regular cleaning and proper storage are usually enough to keep your tools in top condition.

    2. Can replacement parts or accessories be purchased separately?

    Yes, we provide compatible parts and add-ons to extend the life of your tools.

    3. Do you provide instruction manuals or usage guides?

    Every tool comes with a detailed user manual, and digital guides are available online.

    Warranty & Guarantee

    1. Do the tools come with a warranty?

    Every KRANK tool includes a 1-year warranty, with extended options available on select products.

    2. How do I register my KRANK tool for warranty coverage?

    You can register online using your product serial number for faster support.

    3. What does the warranty cover?

    It includes defects in materials and workmanship under normal use conditions.

    4. Is there an option to extend the warranty?

    Yes, extended warranty plans are available for select tools at checkout.

    Purchasing & Support

    1. How fast is shipping and delivery?

    Orders ship within 24 hours, and delivery typically takes 3–5 business days.

    2. Do you offer bulk or corporate purchasing options?

    Yes, KRANK provides special pricing and packages for business or team orders.

    3. How can I contact customer support if I need help?

    You can reach our support team by email or phone — we’re here to assist you.

    Can’t find your answer?

    Feel free to reach out to us!

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