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

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

Product ID: 360381289

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Details

AC adapter current
40 Amps
Brand
Qizpcer
Voltage
12 Volts
Material
Copper
Mounting type
Holder

⚡Supports up to 40A fuse

💧Water-resistant sealed cap

🔌10 AWG heavy-duty wire

Description

⚡ Fuse your power with confidence — never get caught unprotected!

READY FOR ACTION - Includes 4 fuse holders and 4 pre-installed 40A fuses—get your project powered up right out of the box.
COMPACT EFFICIENT - Slim inline design (42x35x13mm) fits seamlessly into tight spaces without compromising performance.
POWERHOUSE PROTECTION - Robust 10 AWG copper wire ensures maximum current flow and durability for your high-demand projects.
PLUG PLAY VERSATILITY - Compatible with all ATC/ATO blade fuses from 1A to 40A, perfect for automotive, marine, and industrial use.
WEATHERPROOF CONFIDENCE - Water-resistant rubber cap seals out moisture and dust, safeguarding your circuits in any environment.

This 4-pack of 10 AWG inline fuse holders features heavy-duty copper wiring and a water-resistant rubber cap to protect your circuits from moisture and dust. Designed for 12V systems, each holder supports ATC/ATO blade fuses up to 40 amps, making it ideal for automotive, marine, and industrial applications. Compact and easy to install, it comes preloaded with 40A fuses to keep your projects running safely and efficiently.

Specifications

Manufacturer	HonL
Part Number	BXSZ-4
Package Dimensions	20.8 x 19.3 x 1.8 cm; 141 g
Item model number	BXSZ-4
Colour	red
Material	Copper
Voltage	12 Volts
Amperage Capacity	40 Amps
Item Package Quantity	1
Number of Pieces	4
Plug profile	Holder
Batteries included?	No
Batteries Required?	No
Item Weight	141 g

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