Is it alright to use this connector on this cable 10/3UF-B southwire (30) amps cable?

I don't know that cable. If it has stranded wire and mechanically fits it will be fine. If the cable is solid wire I would ask the connector manufacturer.

Can i use 10/4 600-volt cu black flexible portable power soow wire with this connector?

Yes that’s what you will need to properly wire it

Can this be used for 400v 3 phase?

This will work just fine up to its 30 A rating. Be sure to purchase the correct mating connector. The data sheet will tell you which one matches. There are a lot of variations to keep people from plugging something into the wrong outlet. The ground connector has an L shaped connection, but the short side can point in or out with respect to the center of the connector. There are also different width pins for the hot leads. These connectors are called "TwistLock" because a small twist locks them in place. Another small twist the opposite direction releases them. They are popular for industrial applications because of their ruggedness, keying yo fit only the correct mating connector, and their ruggedness. They are priced accirdingly.

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Leviton 30 Amp, 480 Volt 3-phase, NEMA L16-30P, 3P, 4W, Locking Plug, Industrial Grade, Grounding, 2731, Black-White

Leviton 30 Amp, 480 Volt 3-phase, NEMA L16-30P, 3P, 4W, Locking Plug, Industrial Grade, Grounding, 2731, Black-White

Product ID: 22399109

Details

Brand
Leviton
Color
Black-White
Material
Nylon
Product Dimensions
30"D x 8"W x
Voltage
480

⚡30 Amp high power

🔌480 Volt 3-phase locking plug

🛡️Industrial-grade durability

₩71899

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Description

🔒 Power up with confidence — lock in reliability that lasts a lifetime!

LIFETIME CONFIDENCE - Industry-exclusive limited lifetime warranty means you’re covered for the long haul — made proudly in North America.
LOCK LOAD SECURITY - NEMA L16-30P locking design guarantees a secure connection that won’t come loose under pressure.
POWER MEETS PRECISION - 30 Amp, 480 Volt 3-phase ensures robust, reliable energy delivery for demanding industrial setups.
FRICTION FREE PERFORMANCE - One-piece contacts reduce friction and overheating, maximizing efficiency and safety.
BUILT TO BRAVE THE ELEMENTS - Rugged nylon construction resists impact, sunlight, chemicals, and rough use — engineered for longevity.

The Leviton 30 Amp, 480 Volt 3-phase NEMA L16-30P locking plug is an industrial-grade power connector designed for secure, high-capacity electrical connections. Featuring rugged nylon construction, one-piece contacts to reduce friction and overheating, and a wide cord clamp for versatile use, it offers unmatched durability and performance backed by a limited lifetime warranty. Perfect for professionals demanding reliable, long-lasting power solutions.

Specifications

ASIN	B001VY0GYE
Amperage	30 A
Best Sellers Rank	#55,530 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #137 in Electric Plugs
Brand Name	Leviton
Color	Black-White
Connector Type	Plug in
Customer Reviews	4.7 4.7 out of 5 stars (150)
Global Trade Identification Number	00078477808382
Included Components	2731
Item Dimensions D x W x H	30"D x 8"W x 6"H
Item Type Name	2731
Manufacturer	Leviton
Material Type	Nylon
Model	2731
Number Of Wires	4
Number of Items	1
Number of Packs	1
Number of Poles	3
Part Number	2731
Plug Type	NEMA L16-30P
Product Grade	Industrial
Specification Met	NEMA
UPC	078477808382
Unit Count	1 Count
Voltage	480 volts_of_alternating_current
Warranty Description	Limited Lifetime

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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₩71899

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

2 days ago

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The product quality is outstanding. Exactly what I needed for my work.

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