Shelly 120A Current Current Transformer Clamp - Power Ammeter Clamp for General Power Monitoring

TheShelly 120A Current Transformer (CT) is a rugged, high-precision accessory specifically designed for monitoring high load electrical circuits. This clamp can measure currents up to 120A, making it the ideal solution for monitoring the overall consumption of a home, commercial premises or photovoltaic power generation systems without requiring invasive interventions on the main wiring.

Key Benefits (Selling Points)

• High Metering Capability (120A): Designed to handle high power flows, this clamp is perfect for mounting on the main power column of the electrical switchboard or on circuits that supply high power consumers such as heat pumps or electric vehicle charging stations.

• Non-Invasive Installation (Split-Core): The clever design allows the clamp to be opened and fixed directly around the phase conductor. There's no need to disconnect fuse wires or switch off the power to the entire building for installation, guaranteeing a quick and secure installation.

• Class 1 Certified Accuracy: Although designed for heavy loads, the clamp maintains rigorous accuracy, ensuring accurate data needed for energy audits, calculating billed costs or optimising consumption in real time via the Shelly app.

• Safety and Galvanic Isolation: The measurement is performed by electromagnetic induction, which means there is no direct electrical contact between the high power circuit being monitored and the smart device. This barrier protects the equipment from possible anomalies in the power grid.

• Ideal for Photovoltaic Systems: It is the preferred accessory for monitoring energy flows in solar systems, allowing you to visualise the energy injected into the grid or the total consumption, facilitating smart resource management.

Usage and Compatibility

• Compatible Devices: This clamp is designed to work exclusively with metering modules in the Shelly ecosystem (such as the Shelly EM, Shelly 3EM or the Shelly Pro 3EM professional version).

• Recommended Applications: Monitoring of the main point of current input to the building, commercial switchboards, large solar inverters and industrial air conditioning systems.

Technical Specifications

• Maximum Current Supported: 120A AC

• Operating Frequency: 50 Hz - 60 Hz

• Accuracy: Class 1 (maximum 1% error)

• Inside Diameter Orifice: Optimised for thick conductors, specific to main power columns.

• Technology: Split-core (allows installation without cable splitting).

• Connectivity: Shielded connecting cable included to minimise electromagnetic interference.

Package Contents: 1 x Shelly 120A current clamp with ready-to-fit connection cable.(Note: Shelly control module is not included in this package and is required for operation).

Why choose the 120A version?

While the low amperage variants are suitable for individual appliances, the 120A clamp is the tool needed to monitor the "big picture". It provides the resistance and measuring range needed to understand exactly how energy flows throughout the home, and is the centrepiece of any modern energy efficiency system.