Special Purpose Fuses Special Purpose Fuses American Fuses Welder Protectors A4BX WELDER PROTECTORS Ferraz Shawmut 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 or K fuses*. Welder Protectors should only be applied for isolation of short circuited welding circuits. Overload protection must be provided for by other means. * Contact us for Class L sizes and rating Standard Fuse Ampere Ratings, Reference Numbers Ampere Rating Catalog Number Class K Class J Dimension Dimension Reference Number Class K Class J Dimension Dimension 100 125 150 200 225 A4BX100-150 A4BX125-150 A4BX150-150 A4BX200-150 A4BX225-150 A4BX200-150J - J218876 D212224 S212743 H217334 G211192 M217844 - 300 400 500 600 A4BX300-150 A4BX400-150 A4BX500-150 A4BX600-150 A4BX300-150J A4BX400-150J - J215288 N217845 M222605 F201968 K215795 Y218360 - Ratings Approvals * 600VAC, 200kA I.R. * Ferraz Shawmut Certified CLASS K CLASS J A4BX ( ) - 150; Class K Dimensions Ampere Rating A B C D Inches E F G H 100 125-200 225-400 500-600 7-7/8 9-5/8 11-5/8 13-3/8 1 1-1/2 2 2-1/2 1/8 3/16 1/4 1/4 23/32 1-1/8 1-5/8 2 2-5/8 3-7/16 4-7/16 5-5/16 - - - 1-1/2 2-3/16 4-3/8 5-1/4 3/8 17/32 9/32 13/32 A4BX ( ) - 150J; Class J Dimensions 125-200 225-400 5-3/4 7-1/8 1-1/2 2 3/16 1/4 1-1/8 1-5/8 SP22 12/04 Special Purpose Fuses Special Purpose Fuses American Fuses Welder Protectors A4BX CURRENT IN AMPERES MELTING TIME - CURRENT DATA, 600V FUSES A4BX100 to 600 Types 150, 150J TIME IN SECONDS MAXIMUM INSTANTANEOUS PEAK LET-THRU AMPERES Peak Let-Thru Current Data - A4BX100 to 600, 600 Volts AC AVAILABLE CURRENT IN RMS SYMMETRICAL AMPERES 12/04 SP23