Can this be installed at a breaker box on a 200amp main breaker?

Yes, sort of. You will need 2 meters with their respective current transformers (those black donuts). One donut for each of the main power wires coming from the meter. Since these donuts aren’t split, you will need to disconnect the cables while still live, unless you remove the power meter. Total power used is the sum of the meters. Basically, you will need an electrician. Or you could by the MTP 3100 or equivalent. It comes with 2 current transformers that are split, so that you open them, slide on the cable, and then close them around the cables. No cutting or disconnecting power. The current transformers are connected to a wireless transmitter that transmits to the base station which sums up the power consumed/cost per hour based on your kWh rate and weekly consumption graph from the 120V and 240V loads instantaneously. There is also a cable and software to connect to your PC.

Power source? Does this run off the power of the circuit being tested or does it need a separate power source? Is it "self powered"?

It probably can but if you look at the images posted by the seller, it has a wiring diagram that says "Use isolated power source" for the meter's function. Probably because the meter measures 0-90VDC but is only able to handle a 0-30VDC power source. The last image has a very clear wiring diagram that's easy to red and understand from there on out though. Good luck.

I need this meter to measure ac volts and dc volts thanks

No - it only does AC volts and amps. You likely need 2 individual meters.

The paperwork doesn't show the cutout size. Does anyone know how big the hole needs to be?

Dear customer, Cutout size is 68mmx37.5mm Best regards, DROK

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DROK AC Voltage Amp Display, Digital Voltmeter Ammeter Multimeter Panel 500V 200A Voltage Current Tester Meter, LED Display Volt Amperage Reader Gauge with Current Transformer CT

DROK AC Voltage Amp Display, Digital Voltmeter Ammeter Multimeter Panel 500V 200A Voltage Current Tester Meter, LED Display Volt Amperage Reader Gauge with Current Transformer CT

Product ID: 586851062

Details

Brand
DROK
Colour
Black green
Item weight
0.05 Kilograms
Power source
Self-Powered
Style
Digital

⚡AC 130-500V voltage range

📊0.39'' dual-color LED display

🔋0-200A current measurement

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Description

⚡ Power up your projects with precision and style!

PRECISION CALIBRATION - Built-in trimmer potentiometer ensures your readings stay accurate, backed by a robust safety-enhanced design.
DUAL COLOR LED DISPLAY - Instantly track voltage (red) and current (green) on one sleek screen for effortless monitoring.
WIDE MEASUREMENT RANGE - Handles AC voltages from 130 to 500V and currents up to 200A — perfect for heavy-duty and precision tasks.
SELF POWERED SIMPLICITY - No extra power source needed — it draws power directly from the circuit, streamlining your setup.
EXTERNAL CURRENT TRANSFORMER - Flexible installation with a 24mm CT hole, letting you place the sensor exactly where you need it.

The DROK AC Voltage Amp Display is a professional-grade digital voltmeter and ammeter panel designed for AC voltage ranges of 130-500V and current up to 200A. Featuring a vibrant 0.39-inch dual-color LED display, it simultaneously shows voltage and current readings for quick, clear monitoring. Equipped with an external current transformer for flexible installation and a built-in trimmer potentiometer for easy calibration, this self-powered meter offers reliable, accurate measurements with enhanced safety features, making it ideal for electrical testing, generator load monitoring, and advanced DIY projects.

Specifications

ASIN	B01M8LCWNW
Best Sellers Rank	#70,807 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Ampere Meters
Brand Name	DROK
Color	Black,green
Customer Reviews	4.4 4.4 out of 5 stars (567)
Included Components	Current Transformer
Item Dimensions	7 x 4 x 3 centimeters
Item Weight	0.05 Kilograms
Manufacturer	DROK
Maximum Operating Voltage	500 Volts
Measurement Type	Ammeter, Multimeter, Voltmeter
Minimum Operating Voltage	130 Volts (AC)
Model	200069
Part Number	200069
Power Source	Self-Powered
Specification Met	Nist Traceable
Style Name	Digital
Upper Temperature Rating	50 Degrees Celsius

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