Can be used on 120vac

No, these are 12V DC fuse and fuse holders for automobile applications. The ratings are displayed in the details.

Why would you cover copper wire with Tin? You know different metals in an electrical circuit can spark right?

Tin is a base metal. You coat copper wires with tin for use in high moisture environments because the tin will help protect the copper wire from early onset of corrosion. You also tin small strand wires to hold them together to better make sure all the strands are making a connection for conducting the load. Look into marine wiring if you are curious about the prevalence of tinned wires.

Are all 4 red color ? Do they sell black too?

All the same color, more orange than red.

Will these work for 48v nominal (~55v upper voltage) systems?

They use 10 gauge stranded wire. 10 gauge (solid) is what folks use to wire electric water heaters and is rated at 600volts A.C. - 30 amps. I am looking at one I bought right now, and the wire IS marked 600 volts right on it. They can be used for 40 amp loads at lower voltages in my opinion since they ship with 40 amp fuse directly from the factory. So it seems that 45-55 volts would be of little concern as long as you keep the amperage under control. 120 volts @ 4 amps translates to 12volts @ 40 amps which is probably why they are equipped with 40 amp fuses from the factory. Obviously, you would use a lesser rated fuse at 45 VDC. Looks like about 10 amps or so to me.

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⚡ Power up with confidence—fuse protection that keeps you moving!

ALL IN ONE 4 PACK - Get four inline fuse holders with 40A fuses—ready to power multiple projects.
ROBUST 10 AWG WIRING - Splice seamlessly into any high-power project with durable, thick gauge wire.
READY FOR ANY ADVENTURE - Perfect for cars, SUVs, ATVs, trucks, trailers, boats, and marine applications.
WATER RESISTANT RUBBER CAP - Protects your fuse from dust and moisture, ensuring reliable performance.
UNIVERSAL ATC ATO COMPATIBILITY - Fits a wide range of blade fuses from 1A to 40A for ultimate flexibility.

The Qizpcer 10 Gauge Inline Fuse Holder kit includes four heavy-duty 10 AWG wire fuse holders compatible with ATC/ATO blade fuses up to 40 amps. Featuring a water-resistant rubber cap and durable copper construction, it’s designed for reliable electrical protection across automotive, marine, and off-road applications.

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Manufacturer	Qizpcer
Part number	BXSZ-4
Item Weight	141 g
Package Dimensions	20.8 x 19.3 x 1.8 cm; 141 g
Item model number	BXSZ-4
Color	red
Material	Copper
Voltage	12 Volts
Amperage Capacity	40 Amps
Item Package Quantity	1
Number Of Pieces	4
Plug Profile	In-line assembly
Batteries Included?	No
Batteries Required?	No

Qizpcer 10 Gauge Fuse Holder - 10 AWG Inline Fuse Holder with 40 AMP ATC Blade Fuses (4pack)

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