Carlo GavazziSingle-Phase DIN-Rail Energy Meter, 230 V L-N, 5(100) A Direct, M-Bus, Bidirectional MID Class B

Product Description

What this part is

A Carlo Gavazzi EM112 single-phase energy analyser in a 2-module DIN-rail housing. It meters active and reactive energy on a 230 V line-to-neutral circuit with the load current passing directly through the meter — no current transformer is needed up to 100 A. Backlit LCD, three rows of eight digits, integrated touch keypad, and an M-Bus port for remote reading.

Decoding the order code

Read EM112-DIN.AV0.1.X.M1.PF.B left to right as model, range, system, power supply, output, option, measurement.

EM112-DIN – single-phase analyser, DIN-rail housing, 2 modules. AV0 – 230 V L-N AC, 5(100) A direct connection (AV1 is the 120 V variant). 1 – 1-phase, 2-wire system. X – self powered from the measured voltage, no auxiliary supply. M1 – M-Bus communication port (S1 would be RS485 Modbus, O1 a pulse output). PF – certified to the MID Directive, Modules B and D, usable for fiscal metrology. B – bidirectional: only the total positive energy register is MID certified, and imported and exported energy are kept apart.

What these specs mean in practice

The B suffix is the one that matters when choosing between otherwise identical EM112s. It gives you separate kWh+ and kWh− registers, with the imported register the certified one, which is what you want for tenant billing or for a site with on-site generation where export must not inflate the bill. It also enables the wrong-current-direction warning: a fixed orange LED means a CT-free direct connection has been wired backwards. The A variant instead sums both directions into one certified total.

Published specifications

System: 1-phase, 2-wire. Nominal voltage: 230 V L-N AC, −30% +20%. Current: Ib 5 A, Imax 100 A, Imin 0.25 A, direct connection. Start-up current: 40 mA; start-up voltage 161 V L-N. Active energy: Class 1 per EN62053-21, Class B per EN50470-3. Reactive energy: Class 2 per EN62053-23. Current/voltage accuracy: ±0.5% of reading. Registers: kWh and kvarh imported and exported separately, kWh+ on two tariffs. Instantaneous values: kW, kvar, V, A, PF, Hz, kW demand and demand peak. Communication: M-Bus per EN13757-3, 0.3 / 2.4 / 9.6 kbaud, up to 250 meters on the network. Digital input: 1, volt-free contact, for tariff switching. Front LED: 1000 imp/kWh; fixed orange LED indicates reversed current direction. Sampling: 4096 samples/s. Insulation: 4000 V AC RMS for 1 minute; overvoltage category III. Operating temperature: −25 to +55 °C (PF option). Protection: IP51 front, IP20 terminals. Housing: 35 x 63 x 90 mm (W x H x D), 2 DIN modules, self-extinguishing UL 94 V-0. Power consumption: ≤1 W, ≤8 VA. Weight: approx. 160 g.

Quantity and configuration

Sold as 1 piece. Sealing covers are part of the standard product; confirm what is present before relying on the tamper seals for a revenue-metering installation.

Installation and setup notes

Menus are reached through the two touch keys behind a password (default 0000). The pages you will want are the M-Bus primary address (1 to 250) and M-Bus baud rate (default 2.4 kbaud); every meter on a shared bus needs its own primary address. The secondary M-Bus address is set at production in the 7000 0000 to 7999 9999 range. Demand integration time is 1 to 30 minutes, default 1 minute. On PFB units the Measurement and Home-page menus are locked, which is expected — the measurement mode is fixed by the certification.

Related models

Within the EM112 family the suffixes are the part. The .PF.A version sums both current directions into a single certified total and is not a substitute here; S1 gives RS485 Modbus instead of M-Bus; O1 gives a pulse output; AV1 is a 120 V meter. The 1-DIN EM111 covers 45 A and the 3-DIN EM340 is the three-phase equivalent — related models in the same range, not drop-in replacements.