Are these made in the USA?

I never checked. But, I doubt it.

In a car, is the dc ground the same as the dc negative?

DC ground and DC negative, chassis ground, are the same thing, a direct connection to the battery negative terminal. The metal body of the car, frame, sheet metal, engine block etc are all connected together and connected to the negative battery cable .

Need this in a 24v coil version with a flyback diode or resistor preinstalled. link?

Hi, This product is for your reference: https://www.amazon.com/dp/B07L2H67BN?ref=myi_title_dp

Are these suitable for continuous duty?

I use mine for auto radiator fan control, the fan runs continuously in traffic during the summer. No issues.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire

4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire

Product ID: 226556587

Details

Connector Type
Plug-In
Contact Material
Copper
Contact Type
Normally Open
Current Rating
40 A
Mounting Type
Socket Mount

⚡40A max switching current

💧Waterproof & dustproof design

🔌7-inch heavy-duty 12 AWG tinned copper wire

₨341

Duties & taxes included

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Power up your ride with reliability that never quits!

PLUG PLAY SIMPLICITY - Standard 4-pin socket mount design makes installation quick and hassle-free, perfect for upgrades or repairs.
ENGINEERED FOR LONGEVITY - Rated for 100,000 electrical operations and 10 million mechanical cycles—reliability that keeps pace with your drive.
POWER THAT PACKS A PUNCH - Handles up to 40 amps and 560 watts, ensuring your automotive electronics run smoothly without a hitch.
BUILT TO BRAVE THE ELEMENTS - Water-repellent and dustproof casing keeps your relay safe in tough environments—just avoid full submersion.
PRECISION WIRING FOR PEAK PERFORMANCE - Equipped with 7-inch 12 AWG tinned copper wires for superior conductivity and durability under load.

The iRhapsody 4-pin 12V DC automotive relay delivers robust 40A switching capacity with waterproof and dustproof protection. Featuring heavy-duty 12 AWG tinned copper wiring and a compact 1.4 x 1.4 x 10 inch form factor, it’s engineered for high durability with 100,000 electrical cycles and resistance to vibration and shock. Ideal for automotive upgrades like reverse cameras or load management, this relay ensures consistent, safe power delivery in demanding environments.

Specifications

ASIN	B08D8TSMFV
Best Sellers Rank	#2,868 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Replacement Accessory Power Relays
Brand Name	iRhapsody
Coil Resistance	80 ohm
Coil Voltage	12 volts
Connector Type	Plug-In
Contact Current Rating	30 A
Contact Material	Copper
Contact Type	Normally Open
Current Rating	40 A
Customer Reviews	4.7 4.7 out of 5 stars (1,012)
Manufacturer	IRHAPSODY
Maximum Switching Current	40 A
Minimum Switching Voltage	6 volts
Model	Relay-MFV
Mounting Type	Socket Mount
Number of Items	1
Number of Packs	1
Operating Time	0.01 seconds
Operation Mode	Automatic
Part Number	4PIN12VRelay40AWF1P
Warranty Description	1 year
Wattage	1.8 watts

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