A4BX
Welder Protectors
Welder protectors
Mersen Welder Protectors are special purpose limiters used to provide isolation of
faulted welding equipment and protection for the cable drop supplying the welder.
Welder Protectors have a high thermal capacity and are less affected by high ambient
temperatures and extended weld times than similar size Class J, K, or R fuses*.
Welder Protectors should only be applied for isolation of short circuited welding
circuits. Overload protection must be provided for by other means.
*Contact factory for Class L sizes and ratings.
Catalog Numbers (amps)
Class K Dimension
A4BX100-150
A4BX125-150
A4BX150-150
A4BX200-150
A4BX225-150
A4BX300-150
A4BX400-150
A4BX500-150
A4BX600-150
Class J Dimension
-
-
-
A4BX200-150J
A4BX225-150J
A4BX300-150J
A4BX400-150J
-
-
Ratings:
Volts
Amps
IR
: 600VAC
: 100 to 600A
: 200kA I.R.
*For larger ratings consult factory.
A4BX (amps) - 150; Class K Dimensions
Ampere
Rating
100
125-200
225-400
500-600
A
7-7/8
9-5/8
11-5/8
13-3/8
B
1
1-1/2
2
2-1/2
C
1/8
3/16
1/4
1/4
D
23/32
1-1/8
1-5/8
2
Inches
E
2-5/8
3-7/16
4-7/16
5-5/16
F
-
-
-
-
G
-
-
-
-
H
-
-
-
-
Approvals:
•
Self Certified
A4BX (amps) - 150J; Class J Dimensions
200
225-400
5-3/4
7-1/8
1-1/2
2
3/16
1/4
1-1/8
1-5/8
1-1/2
2-3/16
4-3/8
5-1/4
3/8
17/32
9/32
13/32
Class K
Class J
G12
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