Shelly SHELLY-400A - Current transformer, White

The SHELLY-400A is a current transformer for the Shelly Pro 3EM-400, designed for professional energy monitoring. It clamps around a conductor to measure electrical current without requiring direct wiring into the circuit. With a capacity of up to 400 A, it is suitable for residential multi-circuit setups, small commercial panels, and industrial environments. The connected energy meter uses the output signal from the transformer to calculate power usage.

The sensor is housed in a white enclosure designed for use within standard electrical distribution boards. It is compatible specifically with the Shelly Pro 3EM series, ensuring integration with these meters. Because of its clamp-on design, installers can set up monitoring points without cutting into existing cabling. The device acts as a measurement component, relying on the host unit to process electrical data.

• 35 mm internal aperture – Fits around large cables for high-amperage measurements.
• 0.6 m connection lead – Sufficient length to route the signal wire to the meter unit.
• 54 x 48 x 84 mm dimensions – Compact profile for installation in crowded distribution cabinets.
• 350 g total weight – Minimises strain on cables when clamped in position.
• Single unit package – Contains one transformer for monitoring an individual phase or circuit.