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Part# 7277-5-7.5
MFR Model# 7277-5-7.5
CIRCUIT BREAKER 7277-5-7.57277-5-7.5


The 7277 series circuit breaker is physically and electrically identical to the 7274-2 style circuit breaker, with the exception that the 7277 series has wider calibration limits.

Originally developed as an alternative to slow blow fuses, the trip free 7277 is used extensively as primary electrical circuit protection on general aviation aircraft. The wider calibration limits of the 7277 has also resulted in applications including protection for data processing and telecommunications equipment, computers, flight simulators, construction, material handling and other industrial,electronic equipment.

For use on trainer / simulator applications where all breakers are operated on low ampere control current, different ampere rating inserts (amp ratings on top of push button) can be ordered.

    Small size
    Light weight
    Auxiliary switch
    Longer push buttons
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • FEATURES: The 7277 series is designed for applications that do not require the tighter performance characteristics and approvals of our military circuit breakers.
    Small size
    Light Weight
    Inexpensive Auxiliary switch 7277-1 Only
    Longer Push Buttons 7277-5 Only
    Temp. C
    Min Ult Trip
    Max Ult Trip
    Trip Time - Seconds

    *Performance characteristics and dimensions are equivalent to 7274 (Calibration: 1/2 - 20 amps*)



These are the long shaft breakers typically found on Citations and other type Jets. They provide enough length to clear the EL type overlay panels.

David M
March 19, 2021

Order arrived in a timely manner, have not installed item yet

Joseph E
February 22, 2021

Placed order and great service from Spruce as usual. Unfortunately, USPS has lost my package. Been waiting 45 days and counting for my order to arrive.

December 31, 2020

Product was just what I needed. Works great, service was fantastic, Id purchase future products from AS&S. Thanks! -Greg G.

Greg G
August 18, 2020

Klixon Circuit Breakers are the standard for my general aviation airplane. The smaller size of the 7277 series is great!

August 12, 2020

I can always count on spruce to have what I need.

Jim C
May 2, 2020

Typical fast service and correct part.

Randy W
February 7, 2020

very happy

Diane W
November 15, 2019


Lee S
September 27, 2019

Exactly what I wanted. Same as the OEM breakers in my Beech.

Craig N
September 26, 2019


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Are the Klixon 7277 series circuit brakers FAA PMA'd and TSO'd?

No, they are not FAA PMA'd or TSO'd.

Q: The 7277 series part numbers have the format 7277-X-Y The 'Y' is obviously the current capacity in Amps. What is is the 'X'?

The first number following 7277 is a type designator. -1 indicates auxilary (not for primary use) and the -5 has a longer push button than the standard -2.

Q: What is the hole size required for the Klixon 7277 circuit breakers?

Per the manufacturer the mounting hole should be 0.445 in diameter and the smaller hole should be 0.125

Q: What is the difference between the 7277-1-* and the 7277-2-* breaker?

The 7277-1 has an Aux. circuit option and the 7277-2 does not.

Q: Does Klixon offer a 1/2 amp breaker in the 7277 version? Any type designator.

Yes, Klixon offers a 1/2 amp breaker which would be a special order, please contact our avionics department to place the order.

Q: Screw type or spade type terminals?

These are screw type terminals.

Q: What size screw is used for the terminals on the 7277 Klixon breakers?

The terminals have 6-32 X 3/16" long screws.

Q: What are the mounting dimensions of the Klixon 7277-5 series circuit breakers?

We have added the drawing to the Dimensions tab of the web page for review.

Q: Are these circuit breakers (7277) approved for certified aircraft?

These circuit breakers do not have FAA Approval on their own. They were commonly installed as OEM breakers on many production aircraft, and thus might be approved under the airframe approval as replacement parts. Please confirm in your aircraft parts manual and with your A&P to ensure these can be legally installed in your aircraft.

Q: Can these be used as a switch?

We do not have any data to support using this circuit breakers as a switch.

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