Circuit Protection
Circuit Breakers
1
Box Style Circuit Breakers
Steel or plastic housing. Steel box type is approximately 1 ¼" x ¾" x 2/3" and comes with integral brackets (to be directly affixed with screws
or bolts) or without (needs a mounting bracket). Breakers have 10-32 studs, blades or wire leads. Wire lead type has a 10" wire loop connected
to studs and PVC-coated. Loop is intended to be cut, stripped and spliced into a circuit.
Datasheet, wiring diagram, and additional pack sizes visit:
littelfuse.com/CircuitBreakers
30056, 30137, 30171 - with studs, no bracket
30055, 30138, 30172 - with studs and bracket
300128 - with studs and cross-bracket
3088, 30507 - double breaker assembly
Steel Case With Stud Terminals
SEALED
SEALED
VOLT AMPS
(V DC) (A)
BOXED RETAIL
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
–
–
-BX
-BX
-BX
–
–
–
–
–
-BP
–
–
–
–
–
–
–
12
12
8
10
15
20
25
30
40
50
6
10
15
20
30
•
•
•
•
•
Type I
sealed
Type I
NOTES
VOLT AMPS
(V DC) (A)
BOXED RETAIL
–
-BX
-BX
-BX
-BX
-BX
-BX
-BX
–
–
–
-BX
–
-BX
-BX
-BX
-BX
-BX
–
–
-BP
-BP
–
-BP
-BP
-BP
–
–
–
–
–
–
–
–
–
–
12
12
12
8
10
15
20
25
30
40
50
10
15
25
30
40
10
15
20
30
40
Type I with
cross-bracket
•
•
•
•
•
Type I sealed
with bracket
Type I
with bracket
NOTES
VOLT AMPS
(V DC) (A)
BOXED RETAIL
-BX
-BX
-BX
-BX
–
-BX
-BX
-BX
–
-BX
-BX
-BX
-BX
–
–
–
–
–
–
–
–
–
–
–
–
–
12
12
24
24
10
15
20
30
10
15
20
30
50
60
80
60
80
•
Type I
double breaker
assembly
Type I sealed
double breaker
assembly
•
Type I
with bracket
Type I
SEALED
SEALED
PART NUMBERS
BULK
PART NUMBERS
BULK
PART NUMBERS
BULK
NOTES
30056-8
30056-10
30056-15
30056-20
30056-25
30056-30
30056-40
30056-50
30137-6*
30137-10*
30137-15
30137-20
30137-30
30055-8*
30055-10
30055-15
30055-20
30055-25
30055-30
30055-40
30055-50
30138-10*
30138-15*
30138-25*
30138-30
30138-40*
30128-10
30128-15
30128-20
30128-30
30128-40
30171-10
30171-15
30171-20
30171-30
30172-10*
30172-15
30172-20
30172-30
3088-50*
3088-60
3088-80
30507-60
30507-80
30062 with wire leads,
with bracket
30063 with wire leads,
without bracket
30407 - Studs and cross-bracket
30401 - steel case with blades
Steel Case With Wire Terminals, PVC-Coated
SEALED
PART NUMBERS
BULK
Plastic Case, Stud Terminals
VOLT AMPS
(V DC) (A)
BOXED RETAIL
-BX
-BX
–
-BX
-BX
–
-BX
–
–
–
–
–
–
–
12
12
15
20
25
30
40
30
50
•
Type I,
Cross Bracket
•
Type III,
Cross-Bracket
SEALED
PART NUMBERS
BULK
Steel Case With Blade Terminals
NOTES
PART NUMBERS
BULK
VOLT AMPS
(V DC) (A)
BOXED RETAIL
-BX
-BX
–
-BX
–
–
–
–
–
–
12
12
20
30
10
10
30
NOTES
Type I with
Bracket
Type I
VOLT AMPS
(V DC) (A)
BOXED RETAIL
-BX
–
–
–
12
15
20
NOTES
30062-20
30062-30
30063-10*
30063-20
30063-30*
•
•
•
•
•
30407-15
30407-20
30407-25*
30407-30
30407-40
30414-30*
30414-50
30401-15
30401-20*
Type I
*Special Order Item
19
Littelfuse Aftermarket Products Catalog
Circuit Breakers
Stud Type Low Voltage (6–12 Volts) • Circuit Breakers
SAE Type I automatic reset provides protection in installations where it is not possible to manually reset a
breaker because of location or safety requirements. Used primarily as a wiring harness protector in 12V DC
automotive systems. Conforms to SAE J553C standard. Available with or without mounting bracket.
CURRENT
RATING (A)
5
6
8
10
15
20
25
30
35
4
50
BOXED W/O BRACKET
MATERIAL NUMBER
1
BOXED W/ BRACKET
MATERIAL NUMBER
CARDED
MATERIAL NUMBER
0812005.ZXST
0812006.ZXST
0812008.ZXST
0812010.ZXST
0812015.ZXST
0812020.ZXST
0812025.ZXST
0812030.ZXST
0812035.ZXST
0812040.ZXST
0812050.ZXST
0813005.ZXST
0813006.ZXST
0813008.ZXST
0813010.ZXST
0813015.ZXST
0813020.ZXST
0813025.ZXST
0813030.ZXST
0813035.ZXST
0813040.ZXST
0813050.ZXST
–
–
–
–
–
0813020.XP
–
0813030.XP
–
0813040.XP
0813050.XP
Circuit Breaker Accessories
Breaker mounting brackets & busbars. Mounting brackets available in steel or nylon and accept 30056 and 30137 series breakers.
Busbars are made from heavy solid brass or copper, with holes or slots that make it easy to connect box-type circuit breakers with studs, in
order to feed a number of protected circuits.
30090-04 4-gang steel bracket
87128-4 Nylon bracket
86099-5 brass busbar with holes
86126-4 copper busbar with slots
PART NUMBERS
BULK
30090-2
30090-3
30090-4
30090-6
30090-8
87128-4
87128-6
87128-8
87128-10
87128-13
86099-2
86099-3
86099-4
86099-5
86126-2
86126-4
86126-6
86126-8
86126-12
BOXED
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
-BX
DESCRIPTION
NUMBER
OF GANGS
2
3
MATERIAL
DIMENSIONS
.81” x 1.29” (122.2 x 32.8 mm)
5.71” x 1.29” (145.0 x 32.8mm)
MOUNTING HOLE
DIMENSIONS
4.00” (101.6mm) on centers
1.90” (124.5mm) on centers
5.81” (147.6mm) on centers
7.62” (193.5mm) on centers
9.43” (239.5mm) on centers
4.89” (124.2mm) on centers
6.71” (170.4mm) on centers
8.53” (216.7mm) on centers
10.35” (262.9mm) on centers
13.08” (332.2mm) on centers
–
–
–
–
.910” (23.11mm) on centers
2.73” (69.34mm) on centers
4.55” (115.57mm) on centers
6.37” (161.79mm) on centers
10.01” (254.25mm) on centers
NOTES
Mounting Bracket
4
6
8
4
6
Steel
6.62” x 1.29” (160.1 x 32.8mm)
8.43” x 1.29” (214.1 x 32.8mm)
10.25” x 1.29” (260.4 x 32.8mm)
5.69” long (114.5mm)
7.51” long (190.8mm)
For all steel breakers without a bracket.
Breakers snap into position, engaging with
dimples in the case of the breaker.
Mounting Bracket
8
10
13
2
3
4
5
2
4
Nylon
9.33” long (237.0mm)
11.15” long (283.2mm)
13.88” long (352.6mm)
1.53” long (38.9mm)
2.43” long (61.7mm)
3.34” long (84.8mm)
4.24” long (197.7mm)
1.41” x .560” (35.8 x 14.2mm)
3.23” x .560” (82.1 x 14.2mm)
Secure stud-type breakers by tightening
the nuts on the breaker studs.
Slots: .910” (23.1mm) on centers,
.210” (5.3mm) wide
Busbar
Brass
Holes: .910” (23.1mm) on centers,
0.21” (5.3mm) dia.
Busbar
6
8
12
Copper
5.05” x .560” (128.3 x 14.2mm)
6.87” x .560” (174.5 x 14.2mm)
10.51” x .560” (267.0 x 14.2mm)
Recommended for use
with brackets 87128-X
Slots: .910” on centers,
.210” (5.3mm) wide
littelfuse.com/Aftermarket
20
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