Fuse Blocks and Circuit Breaker Blocks
> Blue Sea 5502100 Ignition Protected Class-T Fuse Block 225-400A
Blue Sea 5502100 Ignition Protected Class-T Fuse Block - fuse sold separately
Blue Sea 5502100 Ignition Protected Class-T Fuse Block 225-400A
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New design allows the use of Class T fuses for fast acting circuit protection in areas where ignition protection is required. Class-T fuses are particularly fast acting and have a high interrupt capacity.
For Class-T fuses from 225 Amps to 400 Amps
Max 160 Volts DC.
Four stud design provides ample access around connecting stud to install large cable lugs
Insulating cover satisfies ABYC/USCG insulation requirements
Cover must be securely snapped in place to make the assembly ignition protected
Cover breakouts allow wire access in any direction
Stud design ensures secure fuse mounting even with high heat
Stainless steel studs provide resistance to corrosion and high torque
One-piece stainless flange nuts ensure safe and secure connections UL 94-V0 base resists high heat
See drawing for dimensions.
See Additional Information tab for detailed technical specification
Although the maximum fuse size this block takes is 400 Amps the recommended maximum operating current is 320 Amps for general use or 300 Amps if used in an engine space. To be able to run at this maximum operating current the cable size required for continuous duty is 2 x 4/0 awg in an engine space. This is because the cable is required to help remove any heat buildup.
What is the length,height &width of the #5502100 400 amp fuse block?
They haven't yet come out with a drawing of the 5502100 but I put one right beside the 5502 and they are identical in size. If you go to the 5502 page on my website there is a drawing.
This 5502100 is really just a redesign of the cover to make it seal around the fuse and allow it to be called ignition protected. Don't ask me why it costs so much more, but I imagine the certification process is expensive and the price reflects that,
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Answer provided by:
Peter Kennedy (4/13/2018)
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WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to
Ignition protection to ISO 8856 and J1171 when cover is securely closed
Maximum operating voltage 160 Volts DC
Maximum fuse capacity 400 Amps
Maximum operating amperage 320 Amps (300 amps in engine spaces)
Terminal studs 5/16"-18 Also accommodates M8 ring terminals
For 1/4" or M6 mounting hardware
One-piece stainless flange nuts and stainless steel studs
Tin plated copper conductor with UL 94-V0 base
Cable required to meet max ratings for intermittent duty in an engine space is 4/0 awg
Cable required to meet max ratings for continuous duty in an engine space is 2 x 4/0 awg
Best practice is to limit the amount of current in the circuit to 80% of fuse rating.
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