Blue Sea 5007100 Class T Fuse Block 110-200A w/ Cover
Blue Sea 5007100 Class T Fuse Block 110-200A w/ Cover — Product description
The Blue Sea Systems 5007100 is a Class T fuse block for the high-current side of your boat. It takes a single 110 to 200 amp Class T fuse, handles systems up to 160 volts DC, and comes with a clear ignition-protected cover. If you're protecting an inverter or a lithium house bank, this is the fuse block you want.
If you're running an inverter, a big lithium bank, or any high-current DC circuit on your boat, the fuse protecting it matters more than most people think. The Blue Sea Systems 5007100 is a Class T fuse block built for exactly that job. It holds a single Class T fuse anywhere from 110 to 200 amps, it's rated for systems up to 160 volts DC, and it ships with a clear insulating cover that keeps the terminals safe and keeps you legal.
So why Class T? Because when you're dealing with a large lithium bank or a high-output inverter, a short circuit can dump a staggering amount of current in a fraction of a second. Class T fuses are known for their very high interrupt capacity and fast response. They clear that fault before it turns into an arc or a fire. That's why you'll see them called out on inverter installs and lithium house banks again and again. This block gives that fuse a proper, marine-grade home.
We've wired plenty of these into house banks and inverter feeds. The layout is straightforward. Two studs, one fuse across them, cover snaps over the top. The clear cover is the part that keeps the surveyor happy. It satisfies ABYC and USCG ignition-protection requirements, so you can mount this in an engine space or near the batteries without a second thought. And it's clear, so you can eyeball the fuse without pulling the cover every time you want to check it.
A few install notes from experience. Mount it close to the battery positive. That's where the protection needs to live, so the run between the battery and the fuse stays as short as your standards allow. Get your lugs crimped clean and torque the studs down to spec. A loose connection on a 200-amp circuit is how you get heat and arcing. If you're running really heavy cable like 2/0, dry-fit the cover before you commit. Big lugs can crowd it, and offset terminals or a little planning solve that. A dab of dielectric grease on the studs goes a long way in a damp bilge.
Sizing the fuse is its own decision. The block accepts 110 to 200 amp Class T fuses, and you want the fuse rated above your continuous load but below the ampacity of the wire it's protecting. If you're pulling 200 amps continuous through an inverter, plenty of installers step up to the next fuse size to avoid nuisance trips on surge, but always keep it under what your cable can safely carry. The fuse itself is sold separately so you can match it to your exact system. This is the block and cover.
Where does one of these usually end up? Right off the battery bank feeding an inverter, a windlass, a big bow thruster, or the main positive distribution on a boat with serious loads. Anywhere a lot of amps leave the battery, this is the guard you put in the path. Get it wrong and you're betting the whole boat on your wiring never chafing through. Get it right and you never think about it again.
It's happy on 12, 24, or 48 volt systems since it's rated all the way to 160 volts DC. If you're on a big 48-volt lithium setup, just do the homework on your bank's available short-circuit current and confirm the fuse's interrupt rating covers it. That's true of any fuse, not just this one, but it's worth saying out loud because that's the whole reason you're reaching for Class T in the first place.
Bottom line, this is the kind of unglamorous part that quietly does the most important job on the boat. It's not flashy. It just sits there and stands between a dead short and a very bad day. Blue Sea builds their electrical gear for the salt and the vibration, and this block is no exception. If you're protecting an inverter or a serious battery bank, it's exactly what you want on the positive side.
Key Features
- Accepts Class T fuses from 110 to 200 amps so you can size protection to your exact load
- Rated for systems up to 160 volts DC, covers 12, 24, and 48 volt banks
- Clear insulating cover included, meets ABYC and USCG ignition-protection requirements
- Class T design delivers the high interrupt capacity inverters and lithium banks need
- See-through cover lets you check the fuse without pulling it off
- Two-stud layout takes standard crimped lugs for a clean, low-resistance connection
- Fuse sold separately so you match the amperage to your system
Why Buy from NVN Marine
- Authorized Blue Sea Systems reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Blue Sea Systems 5007100 Class T Fuse Block with Cover |
|---|---|
| Brand | Blue Sea Systems |
| Manufacturer Part Number | 5007100-BSS |
| UPC | 632085500719 |
| Fuse Type | Class T |
| Fuse Amperage Range | 110 to 200A |
| Maximum Amperage | 200A |
| Maximum Voltage | 160V DC |
| Ignition Protected | Yes |
| Insulating Cover | Clear, included |
| Meets Standards | ABYC / USCG |
| Product Type | Class T Fuse Block |
Frequently asked questions
What fuse sizes does this block accept?
Class T fuses from 110 to 200 amps. You pick the amperage that fits your system, sized above your continuous load and below what your cable can safely carry.
What's the maximum voltage?
It's rated for systems up to 160 volts DC, so it works on 12, 24, and 48 volt setups with room to spare.
Is it ignition protected?
Yes. The clear insulating cover meets ABYC and USCG requirements, so you can mount it in an engine space or near the batteries.
Why use a Class T fuse instead of another type?
Class T fuses have a very high interrupt capacity and clear a fault fast. That's exactly what you want on a high-output inverter or a large lithium bank where a short can dump huge current in an instant.
Does it come with a fuse?
No. This is the fuse block and cover. Class T fuses are sold separately so you can match the amperage to your load.
Where should I mount it?
As close to the battery positive as your wiring standards allow. The whole point of the fuse is to protect the cable, so you want it near the source.
Can I use it on a 48 volt lithium bank?
Yes, it's rated to 160 volts DC. Just confirm the Class T fuse you choose has an interrupt rating above your bank's available short-circuit current. That check applies to any fuse on a big lithium system.
Will it fit heavy cable like 2/0?
It takes large lugs, but dry-fit the cover before you finalize. Big lugs can crowd the cover, so plan your terminal orientation. Torque the studs to spec and add a little dielectric grease if it lives in a damp space.
What's covered under warranty?
The full Blue Sea Systems manufacturer warranty. We're an authorized reseller, so any claim runs through us.
