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: 401656375

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Details

AC Adapter Current
40 Amps
Brand
Qizpcer
Voltage
12 Volts
Material
Copper
Mounting Type
Through-Hole

💧Water-resistant rubber cap

🔋40A max current capacity

🔌Heavy-duty 10 AWG wire

Description

⚡ Fuse your projects with power and protection!

HEAVY DUTY DURABILITY - Robust 10 AWG copper wire ensures reliable conductivity
QUAD PACK CONVENIENCE - Includes 4 fuse holders and 4 fuses for multiple projects
PLUG PLAY VERSATILITY - Compatible with all standard ATC/ATO blade fuses
POWER UP WITH CONFIDENCE - Supports up to 40 amps for high-demand electronics
BUILT TO BRAVE THE ELEMENTS - Water-resistant cap seals out moisture and dust

The Qizpcer 10 Gauge Inline Fuse Holder set includes four heavy-duty holders with 10 AWG copper wire and 40A ATC blade fuses. Designed for 12V systems, each holder features a water-resistant rubber cap to protect against moisture and dust, making it ideal for automotive, marine, and outdoor electronics projects.

Specifications

AC Adapter Current	40 Amps
Brand	Qizpcer
Voltage	12 Volts
Material	Copper
Mounting Type	Through-Hole Mount
UPC	738631721604 073863172160
Global Trade Identification Number	00738631721604
Manufacturer	Qizpcer
Colour	red
Net Quantity	4 Count
Package Dimensions	20.8 x 19.3 x 1.8 cm; 141 g
Item model number	BXSZ-4
Manufacturer Part Number	BXSZ-4
Country of Origin	USA
Item Weight	141 g

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