Skip to product information
1 of 1
1 product view Open images for a closer look Compare photos with product details

Blue Sea Systems

Blue Sea Systems 187-Series 120A, 48V DC Thermal Circuit Breaker

Blue Sea Systems 187-Series 120A, 48V DC Thermal Circuit Breaker

SKUCT-100448

Regular price $93.00
Regular price Sale price $93.00
Sale Sold out
Shipping calculated at checkout.
Shipping rewards at $100 U.S. orders of $100 or more get free standard shipping, plus $10 off Expedited and Overnight.

Out of stock

Quantity
Use the Tug & Tow SKUInclude this SKU when you contact us about fit, availability, or reorders.
Delivery shown at checkoutShipping options, final costs, and delivery estimates appear before payment.
Check fit before orderingReview dimensions, part numbers, model details, and compatibility notes.
Confirm the details before checkoutFit can depend on your boat, RV, trailer, vehicle, or equipment. Contact us before ordering if compatibility is critical.Ask a product question

Product details

Review the details before ordering.

Ensure superior electrical protection and switching with the Blue Sea Systems 187-Series Thermal Circuit Breaker. Engineered for robust performance in demanding marine and automotive environments, this breaker combines circuit protection and switching into a single, reliable device. Its 'Trip Free' design guarantees safety by preventing the breaker from being held 'ON' during fault current conditions, while its ignition protection makes it safe for use on gasoline-powered boats. Invest in unparalleled safety and control for your vessel or vehicle's electrical systems today.

Key Features & Benefits:

  • High Current Protection: Rated for 120 Amps and a maximum of 48 Volts DC, providing robust overload protection for high-power systems.
  • Ignition Protected: Meets SAE J1171 external ignition protection requirements, ensuring safe installation on gasoline-powered boats.
  • 'Trip Free' Design: Cannot be held 'ON' during a fault current condition, enhancing safety and preventing system damage.
  • Waterproof Construction: Designed to withstand harsh marine conditions for long-lasting reliability.
  • Durable Terminals: Features robust 5/16" (M8) terminals that accept heavy gauge wire lugs, ensuring high torque and secure connections.
  • Clear Operation: Single lever operation with vertical/horizontal orientation provides a quick indication of trip status.
  • Wide Operating Temperature: Functions reliably across a broad temperature range of -25°C to +82°C (-13°F to 180°F).
  • High Interrupt Rating: Capable of interrupting up to 5,000 Amperes at 12V DC, 3,000 Amperes at 24V DC, and 1,500 Amperes at 42V DC.
  • Thermoset Polyester Case: Provides exceptional durability and resistance to environmental factors.

Shipping & returns

Shipping methods, delivery estimates, and final costs appear at checkout before payment. Some bulky, supplier-shipped, or special-handling items may ship separately. See Shipping & Returns for return windows and eligibility.

Fit & compatibility

Review the product title, description, images, dimensions, part numbers, and manufacturer details before purchase. For fit-sensitive items, confirm compatibility with your boat, RV, trailer, vehicle, or equipment.

Need help choosing?

Send us the product link or SKU, plus details about your boat, RV, trailer, vehicle, or project. We will help you narrow down the right option when product fit is not obvious.

View full details