Which Shelly meters is this clamp compatible with?

It is designed exclusively for the Shelly Pro EM-50 and Shelly EM Gen3, connecting to their IA or IB current inputs. It is not compatible with the classic Shelly EM, 3EM or Pro 3EM.

Does the clamp work on its own, without a meter?

No. It is a measurement accessory that only passes a current signal. It needs a Shelly Pro EM-50 or EM Gen3 meter to convert the signal into power and energy data.

What is the maximum current it can measure?

The nominal primary current is 50 A, with a 3000:1 transformation ratio and a stated ±1% accuracy, suitable for common single-phase circuits.

Does the circuit need to be broken for installation?

No. Thanks to the opening split-core, the clamp fits around the live conductor without breaking the circuit. The work inside the board must be done by a qualified electrician.

What conductor thickness fits in the clamp?

The inner aperture is Ø11 mm, enough for standard installation conductors in single-phase residential and small commercial boards.

Shelly 50A Current Transformer Pro EM-50

Name: Shelly 50A Current Transformer for Pro EM-50 and EM Gen3
Brand: Shelly
SKU: SHELLY-CT-50A-PRO-EM-EM-GEN3

casasmart.md

What it is, who it's for, what it does

About this product

This current transformer is a measurement accessory designed exclusively for the Shelly Pro EM-50 and Shelly EM Gen3 energy meters. It is not a standalone device: the clamp supplies the current signal that the meter converts into power and energy readings.<br><br>The split-core design with a ferrite core lets you install the sensor around a live conductor without breaking the circuit, simply by opening the clamp. The transformation ratio is 3000:1, the nominal primary current is 50 A, and the stated accuracy is ±1%. The Ø11 mm inner aperture accepts standard installation conductors.<br><br>The 60 cm cable ends in a 2-pin Molex Micro-Fit connector that plugs directly into the meter's IA or IB inputs. Installation inside the distribution board must be carried out by a qualified electrician.

Delivery
Free from 1500 MDL
Returns
30 days to return
Warranty
24 months

15+projects delivered300+devices installed3 yearslocal-first experienceChișinăushowroom Columna 153Book a showroom visit →

Where it works

Use cases

A Chisinau apartment where heat-pump consumption is measured separately from the household load.

Adding the second clamp to the IB input of a Pro EM-50 meter to separately measure a dedicated circuit.

A house where a clamp was damaged during work in the distribution board.

Swapping a faulty clamp on an already installed EM Gen3 meter without changing the rest of the wiring.

An owner who bills the energy of a small commercial space separately.

Measuring the consumption of a dedicated circuit for a rented area with a Pro EM-50 meter.

For the installer

Technical specifications

full spec · wiring · datasheet

Power

Номинальный первичный ток: 50 A
Вторичный ток: 16.67 mA
Коэффициент трансформации: 3000:1
Accuracy: ±1 %
Сопротивление нагрузки: 20 Ω
Диэлектрическая прочность: 3000 VAC, 1 mA, 60 s

Physical

Внутренний диаметр: 11 mm
Тип сердечника: Разъёмный ферритовый (split-core)
Cable length: 60 cm

Connectivity

Connector: Molex Micro-Fit 43025-0200 (2-pin)
Compatibility: Shelly Pro EM-50, Shelly EM Gen3

Full device datasheet

Support

Frequently asked questions

Which Shelly meters is this clamp compatible with?
It is designed exclusively for the Shelly Pro EM-50 and Shelly EM Gen3, connecting to their IA or IB current inputs. It is not compatible with the classic Shelly EM, 3EM or Pro 3EM.
Does the clamp work on its own, without a meter?
No. It is a measurement accessory that only passes a current signal. It needs a Shelly Pro EM-50 or EM Gen3 meter to convert the signal into power and energy data.
What is the maximum current it can measure?
The nominal primary current is 50 A, with a 3000:1 transformation ratio and a stated ±1% accuracy, suitable for common single-phase circuits.
Does the circuit need to be broken for installation?
No. Thanks to the opening split-core, the clamp fits around the live conductor without breaking the circuit. The work inside the board must be done by a qualified electrician.
What connector and cable length does it have?
The cable is 60 cm long and ends in a 2-pin Molex Micro-Fit connector that plugs directly into the current inputs of the compatible Shelly meter.
What conductor thickness fits in the clamp?
The inner aperture is Ø11 mm, enough for standard installation conductors in single-phase residential and small commercial boards.

Same category

Questions about this product?

A CasaSmart manager calls you within 1–2 working hours and answers anything — compatibility, install, alternatives.

+373 60 944 922

Updated: 18 June 2026· reviewed by CasaSmart Expert Team