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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🔒 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.

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Number Of Poles	3
Product Grade	Industrial
Specification Met	NEMA
Amperage	30 Amps
UPC	078477808382
Manufacturer	Leviton
Global Trade Identification Number	00078477808382
Part Number	2731
Item Weight	5.9 ounces
Product Dimensions	4 x 4 x 4 inches
Item model number	2731
Is Discontinued By Manufacturer	Yes
Size	Leviton
Thickness	1 Inches
Item Package Quantity	1
Number Of Pieces	1
Included Components	2731
Batteries Included?	No
Batteries Required?	No
Warranty Description	Limited Lifetime

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

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