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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Volt Amp Meter, AC 500V 200A Digital Voltmeter Ammeter Panel, 0.39 Inches LED 2in1 Multimeter, 2-Wire Voltage Amperage Tester Gauge with Current Transformer

Product ID: 37497983

Details

Brand
DROK
Color
Green Black
Item Weight
0.05 Kilograms
Power Source
Corded
Style
Voltage Tester

⚡AC 60-500V range

📏0.39 inch dual LED display

🔋0-200A current capacity

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€ 36.28

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Description

⚡ Empower Your Electrical Insights with DROK’s Sleek 2-in-1 Volt Amp Meter!

PLUG AND PLAY POWER - Powered directly by the circuit under test—ditch extra power sources and simplify your workflow.
COMPACT SAFE DESIGN - Sleek 2.76 x 1.57 inch panel with a secure back cover, engineered for professional environments and peace of mind.
CALIBRATE WITH CONFIDENCE - Built-in trimmer potentiometer lets you fine-tune accuracy effortlessly, ensuring reliable readings every time.
DUAL COLOR PRECISION DISPLAY - Simultaneously track voltage (red) and current (green) with crystal-clear LEDs for instant insights.
ALL IN ONE CURRENT TRANSFORMER INCLUDED - No extra purchases needed—flexible installation with built-in CT for seamless setup anywhere.

The DROK Volt Amp Meter is a compact, professional-grade digital multimeter designed for AC voltage measurement from 60 to 500V and current up to 200A. Featuring a dual-color LED display for simultaneous voltage and current readings, it includes a built-in current transformer for flexible installation and is powered directly by the circuit, eliminating the need for external power. Its built-in calibration potentiometer and safety-focused design make it an essential tool for precise electrical testing in industrial and scientific applications.

Specifications

ASIN	B01M8LCWNW
Best Sellers Rank	#42,622 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #511 in Electrical Testing
Brand Name	DROK
Color	Green,Black
Compatible Devices	DROK Volt Amp Meter
Customer Reviews	4.5 4.5 out of 5 stars (594)
Included Components	meter
Item Dimensions	2.76 x 1.57 x 1.18 inches
Item Weight	0.05 Kilograms
Manufacturer	DROK
Measurement Type	Ammeter, Multimeter, Voltmeter
Minimum Operating Voltage	130 Volts (AC)
Model	200069
Part Number	200069
Power Source	Corded Electric
Specification Met	Nist Traceable
Style Name	Voltage Tester
Unit Count	1.0 Count
Upper Temperature Rating	50 Degrees Celsius

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