Shelly CT 120A Split-Core Current Transformer Clamp for Pro 3EM
The Shelly CT 120A is a split-core current transformer designed specifically for use with the Shelly Pro 3EM energy meter. This precision clamp enables accurate monitoring of electrical current up to 120 amperes, making it ideal for residential and commercial energy monitoring applications. With 1% measurement accuracy and a convenient split-core design, the CT 120A allows non-invasive installation without disconnecting live wires, perfect for tracking whole-home energy consumption, solar generation, or high-load appliances.
Key Features
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High Capacity Monitoring: Measures current up to 120A, suitable for heavy-duty circuits and whole-home energy monitoring
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1% Accuracy: Delivers precise current readings for reliable energy management and cost tracking
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Split-Core Design: Easy installation around live cables without cutting or disconnecting wires
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60cm Cable Length: Provides flexibility for installation in tight electrical panels and distribution boards
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Compatible with Shelly Pro 3EM: Designed to work seamlessly with the Shelly Pro 3EM three-phase energy meter
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Professional Grade: Built for durability and long-term reliability in demanding electrical environments
Perfect for Energy Monitoring Applications
The Shelly CT 120A clamp is the essential accessory for anyone using the Shelly Pro 3EM to monitor energy consumption across residential or commercial installations. Whether you're tracking solar energy production, monitoring high-load appliances like EV chargers, or optimising whole-home electricity usage, this current transformer provides the accurate data you need. The split-core design clamps directly around active cables up to 16mm in diameter, making installation quick and safe without the need for electrical disconnection.
Precision and Reliability
Engineered for Class B accuracy, the CT 120A delivers current measurements with 1% precision, ensuring you get dependable real-time data for energy analysis, cost allocation, and power optimisation. The current transformer presents a negligible load to the primary circuit, meaning it won't interfere with your electrical system's performance. With a rated primary current of 120A and rated secondary current of 40mA, this clamp provides accurate proportional output to the Shelly Pro 3EM for detailed energy reporting.
Easy Installation
The 17mm internal diameter accommodates cables up to 16mm, suitable for most residential and light commercial installations. The 60cm cable length provides enough reach to connect conveniently to your Shelly Pro 3EM meter, even in compact electrical panels. Simply open the split-core clamp, position it around the active cable, and close it securely - no wire cutting or circuit interruption required.
What's in the Box
- 1 × Shelly CT 120A Current Transformer Clamp
- User manual
Full Specifications
| Model |
CT 120A |
| Type |
Split-core current transformer |
| Rated Primary Current |
120A |
| Rated Secondary Current |
40mA |
| Accuracy |
1% |
| Internal Diameter |
17mm |
| Maximum Cable Diameter |
16mm |
| Cable Length |
60cm |
| Compatibility |
Shelly Pro 3EM |
| Warranty |
5 years (Shelly Pro accessories) |
Specifications are sourced from the manufacturer product page and may be updated.
