• Blue Sea 8255 Digital Meter Shunt 500A/50mV [8255]

Blue Sea 8255 Digital Meter Shunt 500A/50mV [8255]

Authorized Dealer
In Stock
$68.79
$92.99
$68.79
Shipping calculated at checkout.

SKU: CWR-20764   UPC: 632085082550

Visa Mastercard American Express Discover PayPal Apple Pay Shop Pay
Free Shipping Orders over $149.99
Secure Checkout SSL Encrypted
Manufacturer Warranty Full Warranty Included

Questions? Call, text or email us.

925-222-LOTZ (5689)  ·  shop@lotzoutdoors.com

DC current shunt for marine ammeters, rated at 500A DC with a 50mV full-scale output, enabling compatible monitoring systems to measure battery and electrical-system current.

The Blue Sea Systems 8255 is a resistive DC shunt intended for use with DC ammeters. Its 500A/50mV ratio provides a standardized signal for compatible digital current meters and monitoring systems. The Manganin metal element supports stable current measurement in marine electrical installations. For continuous operation, Blue Sea Systems recommends limiting the shunt to 66% of its rated current under normal conditions.

  • 500A DC / 50mV ratio: Provides the current-sensing signal required by compatible DC ammeters.
  • Resistive Manganin metal element: Converts current flow into a measurable millivolt signal for monitoring.
  • Designed for DC ammeters: Supports current measurement in boat battery banks and other marine DC systems.
  • 66% continuous-duty recommendation: Helps keep normal continuous operation within the manufacturer’s guidance.
  • Compatible Blue Sea monitoring equipment: Serves as the specified 500A/50mV shunt for selected Blue Sea digital meters.
The shunt is installed in a DC electrical circuit so a compatible ammeter can read current flow indirectly through the small voltage signal produced across the resistive element. It is suited to marine battery monitoring, DC distribution panels, charging systems, and other boat electrical installations that require current measurement.
Its 500A/50mV configuration matches compatible Blue Sea Systems digital meters, including selected M2 monitoring equipment, simplifying setup when the meter is configured for this shunt ratio. The shunt is intended for DC measurement rather than direct connection to an AC ammeter. During installation, follow the meter and electrical-system instructions, use appropriate conductors and hardware, and observe the manufacturer’s recommended torque values. Normal continuous operation should remain at or below 66% of the rated current.
Brand Blue Sea Systems
Model 8255
Product type DC digital current shunt
Category Meters & Monitoring
Current rating 500A DC
Full-scale output 50mV DC
Shunt type Resistive, Manganin metal element
Weight 0.71 lb (0.32 kg)
  • What is the Blue Sea 8255 used for?
    It measures DC current when paired with a compatible DC ammeter or monitoring system.
  • What is the shunt rating?
    The 8255 is rated at 500A DC with a 50mV full-scale output.
  • Which meters can use this shunt?
    It is specified for compatible Blue Sea Systems digital meters, including selected M2 monitoring products.
  • What does the 50mV value mean?
    At the shunt’s full rated current, the sensing output is 50 millivolts for the compatible meter to interpret.
  • What is the continuous-use recommendation?
    Blue Sea Systems recommends operating the shunt at no more than 66% of its rated current during normal continuous service.
🚚 Shipping & Fulfillment

Over 30,000 at Lotz Outdoors ship the same day when ordered
by 2pm EST, so you can get your gear quickly for your next adventure.

Some products are fulfilled directly from our trusted third-party partners. As a result, these items may:

• Ship separately from other items in your order

• Have different shipping rates

• Not be eligible for free shipping promotions

We work hard to keep shipping fast, reliable, and transparent across our entire catalog, and any differences will be clearly shown at checkout.
⚠️ Shipping restrictions

Shipping restrictions apply to certain products. By purchasing, you confirm compliance with all local, state, and federal laws.
⚠️ California Proposition 65 Warning

⚠️ WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

This may include but is not limited to:
- Lead and lead compounds
- Nickel and nickel compounds
- Phthalates (DEHP, DBP, BBP, etc.)
- Bisphenol A (BPA)
- Cadmium and cadmium compounds

For more information go to www.P65Warnings.ca.gov

Discount available for Military, First Responders, Medical Workers and Teachers

Logo for GOVX ID, a service used to verify military, first responder, nurse or teachers to qualify them for discounts Get Verified
Blue Sea 8255 Digital Meter Shunt 500A/50mV [8255]