SDM120CT Contatore Monofase Bidirezionale MID con TA 100A/100mA

SDM120CT Single-Phase Bi-Directional MID Meter with 100A/100mA CT

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SKU: FE-SDM120CT
Vendor: Vendor: Fox ESS
New
💡 What it is: Eastron SDM120CT 100mA bidirectional single-phase energy meter with ESCT-TA16 100A open-type CT, MID class B, RS485 Modbus RTU.
🎯 What it is used for: Measures imports and exports on the main line for dynamic wallbox balancing and inverter export limitation.
👷 Who it is for: Installers and private users with a FoxESS 7.3 kW single-phase wallbox (L7P, A7300 with cable or socket), single-phase hybrid inverters, or monitoring with Home Assistant.
🔧 How to use: DIN rail mounting in the panel, CT connected only to the phase conductor, RS485 connection to the wallbox or inverter.
✅ Benefits: Reading up to 100 A without cutting the cables, only 1 DIN module, MID-certified bidirectional measurement.
15 in stock
Regular price €126.10 Sale price €97.00
23% OFF
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SDM120CT Contatore Monofase Bidirezionale MID con TA 100A/100mA

SDM120CT Single-Phase Bi-Directional MID Meter with 100A/100mA CT

€97.00

📐 Single-phase 230 V with 100A/100mA CT │ RS485 Modbus RTU │ 1-module DIN rail mount — 🔧 Installation difficulty: 3/5 │ 🎯 Ideal for: FoxESS 7.3 kW single-phase L and A series wallboxes, single-phase hybrid inverters, energy monitoring with Home Assistant

SDM120CT single-phase meter with CT for balancing wallbox and household consumption

A 7.3 kW wallbox that is unaware of household consumption will trip the supply meter at the first washing machine. The Eastron SDM120CT single-phase meter, distributed by FoxESS, reads the main line with the 100 A split-core CT and transmits it as an RS485 Modbus bidirectional meter to the wallbox, which adjusts the charging current.

Who chooses it

Anyone installing a FoxESS 7.3 kW single-phase wallbox, L7P series or A7300 series with cable or Type 2 socket, for dynamic load balancing; anyone who has a single-phase hybrid inverter and needs to read import and export at the delivery point; anyone who monitors consumption with Home Assistant via Modbus. It is not the right choice for 11 and 22 kW three-phase wallboxes: there you need the DTSU666 three-phase meter.

Technical analysis and advantages of the meter for single-phase wallbox load balancing

  • 🔌 ESCT-TA16 100A/100mA split-core CT included: it attaches to the phase without disconnecting cables and reads up to 100 A, beyond the 60-80 A of direct-insertion single-phase meters.
  • 🔄 Bidirectional import/export measurement: kWh drawn and fed back recorded separately, for inverter feed-in limitation and charging with photovoltaic surplus.
  • ⚡ RS485 Modbus RTU: factory address 001, 9600 bps, no parity; connection to wallbox, inverter or Home Assistant. RS485 cable not included.
  • 📏 Width 18 mm, 1 DIN module: half the space of a 2-module single-phase meter (36 mm), useful in full panels.
  • 🛡️ MID class B certification (EN 50470-3): error within 1% on active energy (IEC 62053-21 class 1), the MID threshold for billing.
  • 📊 Backlit LCD display: energy, power, voltage, current, power factor and frequency viewable with the front button.

Technical data sheet

Manufacturer Eastron — distributed by FoxESS
Model SDM120CT 100mA Modbus MID + ESCT-TA16 100A/100mA CT
Compatible wallboxes FoxESS 7.3 kW single-phase: L7P (FE-LSL07PC), A7300 with cable (FE-A7300P1-E-2-WO, FE-A7300P1-E1-S), A7300 with socket (FE-A7300S1-E1)
Network type Single-phase 2 wires (L+N)
Rated voltage 230 V AC (range 176-276 V)
Frequency 50/60 Hz
Current input 100 mA from external CT
CT included ESCT-TA16 split-core 100A/100mA
Active energy accuracy Class 1 IEC 62053-21 · Class B EN 50470-3 (MID)
Measured quantities kWh, kVArh, W, VAr, VA, V, A, PF, Hz, Max Demand
Communication RS485 Modbus RTU, 1200-9600 bps (default 9600, ID 001)
Pulse outputs 1000 pulses/kWh fixed + 1 configurable
Maximum reading 999999 kWh
Self-consumption < 1 W / 10 VA
Dimensions 18 × 118 × 64 mm (DIN 43880)
Mounting 35 mm DIN rail
Protection rating IP51 (indoor use only)
Operating temperature -25 °C / +55 °C
Material UL94 V-0 flame retardant
Certifications MID EN 50470-1/-3 · EMC EN 61326-1, EN 61326-2-3 · LVD EN 61010-1, EN 61010-2-3 · CE · RoHS
Weight 120 g
SKU FE-SDM120CT
EAN —
Simone — Oniroview

💡 Simone's advice — Oniroview

For correct reading, attach the CT only to the phase conductor of the main line, immediately after the utility meter and before all loads, including the wallbox: if the phase and neutral pass through the CT together, the currents cancel out and the meter reads zero. Respect the direction of the arrow indicated in the manual, because a reversed CT swaps import and export. For RS485 use a shielded twisted pair, A to A and B to B.

Complete your system

Frequently asked questions

Which wallboxes does the SDM120CT meter work with?
With 7.3 kW single-phase FoxESS wallboxes, L7P series and A7300 series: FoxESS recommends the SDM120CT for their dynamic balancing on lines up to 100 A. It does not work with 11 and 22 kW three-phase FoxESS. The wallbox receives household consumption via RS485 and reduces the current, but not below 6 A: with very high loads, charging is suspended until power becomes available.

What is the difference between SDM120CT and DDSU666 for single-phase wallbox load balancing?
The DDSU666 connects in series to the line for direct reading and occupies 2 DIN modules (36 mm). The SDM120CT reads up to 100 A with the split-core CT, without interrupting the cables, in a single 18 mm module. FoxESS recommends both for the 7.3 kW single-phase wallbox.

Is the RS485 Modbus SDM120CT bidirectional meter compatible with any hybrid inverter?
No, not all. Each manufacturer only recognizes the meters whose Modbus registers it reads, and some require CTs with an output other than 100 mA. With FoxESS hybrid inverters, the meter can be shared with the wallbox; for other brands, check in the inverter manual that the SDM120CT 100 mA is supported.

Package contents

📦 1 Eastron SDM120CT 100mA single-phase meter · 1 ESCT-TA16 100A/100mA split-core CT · manufacturer documentation

Warranty and safety

✅ CE, RoHS, MID class B. 📜 2-year legal warranty (Italian Legislative Decree 170/2021). ⚠️ IP51, indoor use only: installation in a panel, in a sectioned circuit, by qualified personnel; do not connect to 400 V three-phase networks. Before purchase, check that the wallbox is a FoxESS 7.3 kW single-phase or that the inverter supports the SDM120CT 100 mA.

Shipping from Catania. Technical assistance for wallbox balancing and photovoltaic systems.

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