Am planning to use an external ct. what ct ratio should i use? any recommendations?

hi, The CT is designed to built inside the product. you can't use external ct. As you can see in the picture, there is a hole in the meter. The CT is built around the hole inside the meter. The wire go through the hole is equal to go through the CT.

Can the KWH be reset?

yes， it can be reset. When powered off, the meter can save the value of electric energy and electric energy of cumulative time, and go on cumulating data when the meter is powered on again. When the meter is displaying electric energy, you can press down SAM CK button to reset the electric energy and electric energy of cumulative time to zero.

Can i use this to monitor voltage, amperage from a conventional residential electrical panel to a standard 3-prong outlet?: 120v 50 amp breaker 60hz?

Yes as long a it's single phase. The unit has two small screw terminals for power to the unit and voltage sampling. And a 3/8" hole through it top to bottom with an inductive ampmeter coil. You just pass your hot wire through the hole and it samples the amperage. It will easily fit a #6 wire.

What would be the connections for a US 240 V without neutral?

You still have to run a neutral to it or a ground.

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KETOTEK Single Phase Energy Meter, DIN Rail Power Meter KWH Meter AC 80-300V 100A, Kilowatt Hour Volt Amp Watt CT Sensor

KETOTEK Single Phase Energy Meter, DIN Rail Power Meter KWH Meter AC 80-300V 100A, Kilowatt Hour Volt Amp Watt CT Sensor

Product ID: 25853621

Details

Brand
KETOTEK
Color
Green Red
Item Weight
0.13 g
Power Source
Corded
Style
AC 80-300V

⚡AC 80-300V voltage range

🔋100A max current load

⏱️2x measurements per second

Description

⚡ Power Your Insights with Precision & Speed!

SMART DATA MANAGEMENT - Auto-save energy data on power loss plus easy reset for fresh measurements anytime.
PRECISION YOU CAN TRUST - High-accuracy measurement with 1% ±2 digits and rapid 2x per second sampling speed.
INSTANT MULTI DATA DISPLAY - One-click toggles voltage, current, power factor, and energy readings with intuitive LED indicators.
BUILT FOR SAFETY DURABILITY - Flame-resistant ABS casing paired with a precision chip ensures reliable, safe operation.
VERSATILE INDUSTRIAL GRADE USE - Supports up to 100A load, perfect for homes, labs, markets, and industrial setups.

The KETOTEK Single Phase Energy Meter is a DIN rail-mounted power meter designed for accurate AC voltage (80-300V) and current (up to 100A) monitoring. It features a user-friendly one-click data display switching among voltage, current, power factor, active power, and cumulative energy with LED indicators. Built with flame-resistant ABS and a precision chip, it offers 1% accuracy and fast 2 measurements per second sampling. Ideal for diverse environments including industrial, commercial, and residential, it auto-saves data on power loss and supports easy resets for multiple measurement cycles.

Specifications

ASIN	B01ANVFCG2
Brand Name	KETOTEK
Color	Green, Red
Customer Reviews	4.6 4.6 out of 5 stars (50)
Item Dimensions	3.15 x 2.13 x 2.52 inches
Item Weight	0.13 g
Manufacturer	KETOTEK
Measurement Type	Multimeter
Part Number	D52-2047
Power Source	Corded Electric
Specification Met	CE
Style Name	AC 80-300V
UPC	723260100005

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