12-17-98
SB98107 Rev. A
Aircraft Limiter ACH
Fast-Acting
Form No. ACH
Page 1 of 2
BIF Doc #1041
Bussmann®
Catalog Symbol: ACH
Fast-Acting
Ampere Rating: 1 to 60 Amperes
Voltage Rating: 208 Volts AC
125 Volts DC
Interrupting Rating:
6000A @ 120 VAC
4200A @ 208 VAC
6000A @ 125 VDC
At sea level to 6000 ft.
Test specification - carry 200% rated current for 5 minutes,
open at 240% within 5 minutes.
For Military Use
Qualified to MIL-F-5372C
Military Type Buss Cat.
Designation Symbol
MS28938-02 ACH2
MS28938-03 ACH3
MS28937-05 ACH5
MS28937-10 ACH10
MS28938-15 ACH15
MS28937-20 ACH20
Military Type Buss Cat.
Designation Symbol
MS28938-25 ACH25
MS28937-30 ACH30
MS28938-35 ACH35
MS28937-40 ACH40
MS28937-50 ACH50
MS28937-60 ACH60
Symbol Amperes A B C D
ACH 2, 3, 5, 10, 15, 1.97∑ 0.06∑ 0.48∑ 1.33∑
20, 25 or 30 (50.0mm) (1.59mm) (12.3mm) (33.8mm)
ACH 35, 40, 50 or 60 2.22∑ 0.09∑ 0.55∑ 1.45∑
(56.39mm) (2.27mm) (13.97mm) (36.83mm)
Buss Aircraft Fuses
Mechanical Indicating - Limiter type
• ACH limiters are designed to meet the very rigorous require-
ments of high speed, high performance aircraft.
• Isolate faults or grounds in aircraft electric systems of
120/208 volts 400 cycles AC or 125 volts DC.
• ACH limiters give visual indication when open by a spring-
activated pin that extends from the limiter body.
• The knife blade terminals on ACH limiters are silver-plated.
• Limiters are made with a silicone body that assures reliable
performance under severe conditions.
• Designed to withstand exposure to moisture, fungus, salt
spray, sand and dust, and mechanical vibration and shock.
Dimensional Data All other tolerances (± 0.005) in
(± 0.13) mm
BUSS
ACH 30
D
A
B
C
.425"
(10.8mm)
0.98"
(25.0mm)
0.19"
(4.76mm)
12-17-98
SB98107 Rev. A
Aircraft Limiter ACH
Fast-Acting
Bussmann®
Form No. ACH
Page 2 of 2
BIF Doc #1041
The only controlled copy of this BIF document is the electronic read-only version located on the Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin
is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. Bussmann also reserves the right to change or update, without notice, any technical information con-
tained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
1 to 30 Amp
Catalog Dimension of
Number base, inches
3887 (1-pole) 0.688∑ ≈ 3.125∑
3888 (2-pole) 1.188∑ ≈ 3.125∑
3967 (3-pole) 1.625∑ ≈ 3.125∑
35 to 60 Amp
Catalog Dimension of
Number base, inches
3889 (1-pole) 0.844∑ ≈ 3.375∑
3890 (2-pole) 1.594∑ ≈ 3.375∑
3968 (3-pole) 2.25∑ ≈ 3.375∑
Fuseblocks
• All metal parts silver-plated.
• Clips are beryllium copper.
• The blocks have molded melamine base and are qualified to
MIL-F-5373C.
10
100
1,000
2,000
4
100
10
1
.1
.01
TIME IN SECONDS
AMPERE
RATING
10
20
40
30
50
60
CURRENT IN AMPERES
Time-Current Characteristic Curves–Average Melt
