Will this work on 4/0 wire?

Yes I personally used it on 750MCM which is 5 times the diameter of 4/0. This is a great phase rotation meter.

Does it work on 480-V delta and wye systems?

Yes. It has worked perfectly on all systems and all voltages up to and including 480 for us. Excellent tool and much safer.

Will this work on the output of a VFD?

It should as long as the VFD is running (being commanded to go a direction at 50-60 HZ)

Can this be used on single phase 240 volt service?

Hi, phase sequence is only used to determine the correct phasing of the 3 phase supply. You need not use this device for single phase at all. You only need a volt meter to ensure that the supply is in order in terms of L N E.

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Description

⚡ Stay ahead of the current with precision and power!

RUGGED DURABILITY - Double molded ABS housing ensures long-lasting protection on the job site.
USER FRIENDLY CLIPS - Wide jaw alligator clips make connections fast and secure every time.
HIGH VOLTAGE CAPABILITY - Safely tests up to 600VAC, perfect for demanding electrical environments.
PRECISION PHASE DETECTION - Accurately checks phase sequence and status to keep your systems flawless.
INTUITIVE GRAPHICAL DISPLAY - Large LCD shows clear phase orientation for quick, confident readings.

The Extech 480400 Phase R is a compact, battery-powered phase sequence tester featuring a large LCD for graphical phase orientation. It supports testing up to 600VAC, housed in a durable double molded ABS casing, and includes easy-to-use wide jaw alligator clips for reliable connections. Ideal for professionals needing accurate phase status checks in demanding electrical environments.

Specifications

Manufacturer	Extech
Part number	480400
Item Weight	140 g
Product Dimensions	6.86 x 3.18 x 12.96 cm; 140 g
Batteries	1 Product Specific batteries required.
Item model number	480400
Size	Phase Sequence r
Color	480400
Style	480400
Material	ABS
Power source type	Battery Powered
Item Package Quantity	1
Number Of Pieces	1
Display Style	LCD
Specification met	CE
Batteries Included?	No
Batteries Required?	No