187 Series Thermal Circuit Breakers - Surface Mount
Mouse Over to Zoom
Click to Enlarge

BLUE SEA SYSTEMS187 Series Thermal Circuit Breakers - Surface Mount

Prices from $104.99 - To $144.99


In stock online.
Model # 8646333 | Mfg # 7039UPC # 632085070397


Product Overview

Thermal circuit breakers provide heavy duty circuit protection for 25 to 200 Amp loads when switching and circuit protection are both required.

  • Single lever operation—clearly visible, large lever with vertical/horizontal orientation provides indication of trip status
  • "Trip Free" design cannot be held "ON" during fault current condition
  • Self-trimming case eliminates need for mounting panels or trim bezels
  • Large clearance around terminal studs accepts up to 1/0 AWG lugs
  • Recessed mounting holes for clean appearance
  • Robust 5/16"-18 terminals provide high torque connections
  • Meets SAE J1171 external ignition protection requirements


  • Maximum Voltage: 48V DC
  • Mounting: Surface Mount
  • Circuit Breaker Type: Thermally responsive Bi-metal blade
  • Circuit Breaker Class: Type III - switchable/manual reset - trip free
  • Terminal Stud Torque: 75 in-lb (8.47 Nm)
  • Interrupt Capacity, The fault current that a device, normally a fuse or circuit breaker is capable of breaking without damage: 5000A @ 12V, 3000A @ 24V, 1500A @ 42V
  • Minimum Operating Temperature: -40° C
  • Maximum Operating Temperature: 85° C
  • Case Material: Thermoset Polyester
  • Mounting Hole: Accept #10 (M5) Screw
  • Terminal Stud Size: 5/16" - 18
  • Weight: 0.58lb (0.26 kg)

Dimensional Drawing

Trip Delay Curve

 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.


The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

Related West Advisor Articles


Product Q & A