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Klixon - Texas Instruments 

Aircraft Circuit Breakers

Single Phase, Ambient Non-Compensated

Picture of 7277

Section#1... 7277 Series

Features
 Small Size, Light Weight, High Vibration Resistance, Current Rating (½ - 20 Amps)

Overview
The Klixon 7277 series is designed for applications that do not require the tighter performance characteristics and approvals of our military circuit breakers.

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 have also resulted in applications including protection for data processing and telecommunications equipment, computers, flight simulators, construction, materials 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 separately. Use TI part number 27515.

Options
 Auxiliary Switch, Dust Bootą, Terminal hardware

    ¹ Part #14500-1 fits 15/32 bushing
      Part # 14500-5 fits 7/16 bushing

 

Section#2... 7277 Series - Calibration: 1-20 Amps (Typical*)

Temp
°C		 Min. Ult.
Trip		 Max. Ult.
Trip		 Trip Time - Seconds
200% 500% 1000%
+25 110% 150% 2 - 35 .15 - 1.70 .028 - .55
*The above calibration chart is representative of a standard commercial device. TI offers specific variants with similar performance dependant on military or customer specifications.
Ampere Max Drop*
Rating (volts)
½ 2.00
¾ 1.45
1 1.10
1½ 0.75
2 0.70
2½ 0.50
3 0.33
4 0.30
5 0.25
7½ 0.20
10 0.15
15 0.15
20 0.15
*Max voltage drop at nominal rated current.
 

Section#3... Series 7277 - Dimensional & Delay Curve


Nominal dimensions provided for reference purposes.

 

Section#4... 7277 Series - PN & Amperage Ratings 

Klixon #

Amp Rating

 Klixon #

Amp Rating
7277-2-.5 ½ 7277-5-.5 ½
7277-2-.75 ¾ 7277-5-.75 ¾
7277-2-1 1 7277-5-1 1
7277-2-1.5 1½ 7277-5-1.5 1½
7277-2-2 2 7277-5-2 2
7277-2-2.5 2½ 7277-5-2.5 2½
7277-2-3 3 7277-5-3 3
7277-2-4 4 7277-5-4 4
7277-2-5 5 7277-5-5 5
7277-2-7.5 7½ 7277-5-7.5 7½
7277-2-10 10 7277-5-10 10
7277-2-15 15 7277-5-15 15
7277-2-20 20 7277-5-20 20
 

 

Section#5... 7277 Series Ordering System
Field 1
7277
Basic type
Field 2
x
The derivative, usually:
1= aux. switch
2= push button - .440" long  (tripped position)
3= longer bushing - obsolete
5= push button - .300" long  (tripped position)
6=aux. switch, longer push button.
Field 3
xx
Amp rating (for 5A, the number would be 5, for 7 1/2A it would be 7 1/2, etc.).
  So, a 7277 with an auxillary switch, rated for 2 Amps would be 7277-1-2.

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