Circuit breakers play an important role in protecting a variety of automotive applications, from power windows and door locks to headlights and taillights. Which is why this 15A automatic reset (Type I) circuit breaker has been specially coated with a heavy-duty Zinc plated metal housing to help protect the circuit breaker against corrosion and extreme elements, so it can protect your various automotive and marine applications. It features a right angle/ perpendicular bracket with pre-drilled holes and two 10-32 stud terminals for easy mounting and wire attachment. These shortstop circuit breakers are also available inNon-Cycling (Type II) and Manual Reset (Type III) modes. 


  • 15-amp Type I (cycling/ automatic reset) shortstop circuit breaker
  • Cycles continuously during over-current conditions
  • Returns to ON when the source of the over-current is removed
  • Features (2) 10-32 stud terminals for easy wire attachment
  • Designed with a Zinc plated metal housing for superior protection against extreme elements
  • Features a right angle/ perpendicular bracket for easy mounting
  • Also available in IP66 rated plastic housing
  • Meets SAE J553 & J1171 (waterproof) standards

Technical Specifications 

  • Manufacturer: Cooper Bussmann
  • Manufacturer Part Number: 121B15-A2M-KA
  • Amps: 15
  • Type: Shortstop
  • Reset Method: Type I (Automatic)
  • Mounting Style: Right Angle Bracket
  • Housing Material: Metal
  • Terminal Connection: 10-32 Studs
  • SAE Compliance: J553; J1171