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

⚡ Master the power flow with precision and safety!

READY TO GO KIT - Includes color-coded alligator clips and pouch case—no batteries needed, just plug and test.
SAFETY FIRST DESIGN - Minimizes inspection time and injury risk compared to traditional methods—work smarter, safer.
PRECISION PHASE DETECTION - Accurately tests 3-phase power direction from 40 to 600 volts, ensuring flawless electrical diagnostics.
INTUITIVE VISUAL INTERFACE - Multi-line graphical LCD clearly displays phase orientation and live status for quick, confident readings.
DURABLE BUILD FOR HARSH ENVIRONMENTS - Robust stainless steel frame resists corrosion, built to last in demanding industrial settings.

The Extech 480400 Phase Tester is a compact, battery-free device designed for accurate phase sequence testing in 3-phase electrical systems ranging from 40 to 600 volts and 15-400Hz frequency. Featuring a clear multi-line graphical LCD and a corrosion-resistant stainless steel frame, it delivers fast, safe, and reliable diagnostics in harsh industrial environments. Complete with color-coded alligator clips and a pouch, it’s the essential tool for professionals demanding efficiency and durability.

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Brand	EXTECH
Model Number	480400
Product Dimensions	6.86 x 3.18 x 12.96 cm; 140 g
Color	480400
Name List for Name Plates	480400
Wallpaper Pattern	Tester
Power Source	Battery Powered
Quantity	1
Are Batteries Included	No
Item Weight	140 g

Extech - 480400 Phase Tester

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Description

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Common Questions