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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⚡ Power up your precision with DROK’s sleek 2-in-1 multimeter!

PLUG AND PLAY SETUP - 2-wire digital design with current transformer for quick, hassle-free installation
CERTIFIED RELIABILITY - CE-certified for professional-grade accuracy and safety compliance
ULTRA COMPACT DISPLAY - 0.39-inch LED panel fits perfectly in any control panel or workspace
DUAL FUNCTION PRECISION - Seamlessly measures both AC voltage and current in one sleek device
HIGH VOLTAGE CURRENT CAPACITY - Handles up to 500V and 200A for demanding electrical tasks

The DROK 0.39-inch LED 2-in-1 Multimeter combines a voltmeter and ammeter capable of measuring AC voltage up to 500V and current up to 200A. Its compact digital display and 2-wire design with a current transformer make it an ideal panel meter for professional electrical monitoring, backed by CE certification for quality assurance.

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Brand	DROK
Power Source	Corded Electric
Style	Digital
Colour	Black
Item Weight	0.05 Kilograms
Item dimensions L x W x H	7 x 4 x 3 Centimeters
Min. Operating Voltage	500 Volts
Specification Met	CE
Measurement Type	Ammeter
Maximum Operating Voltage	500 Volts
Manufacturer	DROK
Item model number	200069
Product Dimensions	7 x 4 x 3 cm; 50 g
ASIN	B01M8LCWNW

DROK 0.39 Inches LED 2in1 Multimeter AC 500V 200A Voltmeter Ammeter, AC Volts Meter Panel Ammeter Gauge with Current Transformer, 2-Wires Digital Ammeter Volts Meter Tester

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