Meter 3f ED 310.DB HWG – Three-phase meter with display
€743.00
Three-Phase Energy Meter with Display and M-Bus Interface
The Meter 3f ED 310.DB HWG is a static, multi-phase electricity meter for measuring and displaying active electrical energy consumption in low-voltage networks. It features a four-wire direct connection to 3 x 230/400 V and supports currents of up to 63 A. Accuracy class A or B according to EN 50470-1 and EN 50470-3 ensures certified, reliable measurements.
The DB version is equipped with a galvanically isolated M-Bus communication module, allowing centralized reading via a shared two-wire bus. The meter also features an optical interface according to EN 62056-21, an S0 pulse output according to EN 62053-31, and an LCD display with freely configurable measurement values. This makes the Meter 3f ED 310.DB HWG ideal for energy submetering in combination with HWg devices such as Perseus Energy 242/285 or HWg-PWR3/12/25.
Precise measurement, flexible communication
The Meter 3f ED 310.DB HWG combines energy measurement, display functionality, and remote reading in a single DIN-rail device.
3 x 230/400 V, up to 63 A
Direct connection, four-wire system, accuracy class A or B according to EN 50470-1/-3.
M-Bus module
Galvanically isolated, powered via the two-wire bus, with a range of up to 1,000 m.
LCD display
Displays consumption per tariff, instantaneous values, a power bar graph, and phase status.
Optical interface and test LED
Local reading according to EN 62056-21 and a programmable S0 pulse output (class A according to EN 62053-31) for calibration testing.
Multi-tariff capable
Up to four tariffs can be selected via external tariff inputs; the active tariff is shown on the display.
DIN-rail mounting
Compact housing (107 x 91 x 71.5 mm) for easy installation in control cabinets.
How the Meter 3f ED 310.DB HWG is designed
A microprocessor digitizes current and voltage signals, performs all calculations, and controls the display, communication, and pulse outputs.
Measurement system
The ED 310 is a static multi-phase active energy meter with accuracy class A or B according to EN 50470-1 and EN 50470-3. The microprocessor digitizes analog current and voltage signals and calculates consumption and delivery for each tariff (up to four tariffs, or eight energy registers), as well as operating times, maximum current, and maximum power, including per-phase values. Calibration is performed entirely electronically, with no mechanically adjustable components. High measurement accuracy is maintained even when only one or two phases are connected, including phase shifts of up to 180°.
Connection and measurement range
The meter is directly connected using four wires to a reference voltage Un of 3 x 230/400 V (operating range 0.75 Un to 1.15 Un, nominal frequency 50 Hz, 45–55 Hz). Starting current is below 15 mA, minimum current is 200 mA, and transition current is 500 mA. The reference current Iref can be configured to 5 A or 10 A, while the continuous maximum current Imax can be configured in whole-number multiples of Ib between 40 A and 63 A. The total measurement range extends from 15 mA to 63 A. Power consumption per voltage circuit is a maximum of 0.7 W/8 VA, and a maximum of 0.01 VA per current circuit.
Tariff inputs
Up to three external inputs allow switching between up to four tariffs. Switching is performed by applying a switching voltage Ut of 230 V to the tariff terminals (permitted range 0.75 Ut to 1.15 Ut, maximum consumption at 230 V: 1.5 mA). The active tariff is shown on the display.
M-Bus communication module
The DB version is equipped with an M-Bus module that is galvanically isolated from the rest of the meter and powered via the two-wire communication line itself (supply range 24–36 V DC). In idle mode, the module draws 2.4 mA, logically representing “1”. To transmit a logical “0”, the current increases to 12–20 mA. Depending on the selected communication speed, distances between 350 m and 1,000 m can be covered. Both RJ45 sockets are identical and allow several meters to be connected in series on the same bus.
Optical interface and S0 output
An optical interface according to EN 62056-21 enables local reading via an optical probe connected to a PC or PDA using RS-232 or USB. The communication speed can be configured from 300 Bd to 9,600 Bd. The programmable S0 output (class A according to EN 62053-31, two-wire, open collector) provides 0.15 to 10,000 pulses/kWh with a standard pulse width of 40 ms, a supply voltage of 24 V DC (max. 30 V DC), a current of 5–15 mA, and a maximum cable length of 1,000 m. A red calibration LED also emits light pulses using the programmable meter constant (default: 10,000 pulses/kWh) for testing purposes.
Housing, display, and environment
The housing (107 x 91 x 71.5 mm, approx. 0.4 kg without or 0.5 kg with communication module) is designed for DIN-rail mounting and provides IP20 protection in an operating temperature range of -25 °C to +55 °C without condensation. The LCD display can show consumption/delivery per tariff, RMS current and voltage, instantaneous power, maximum values, power factor, operating time, meter constant, and an instantaneous power bar graph. The L1, L2, and L3 symbols indicate the presence and correct sequence of the phase voltages. Delivery values are marked with a preceding “-”.
What “ED 310.DB” means
The type designation of the ED 310 family encodes the connection type, communication module, and other features.
D = Direct connection
The “D” in ED 310.D stands for the direct four-wire connection, in contrast to the indirect ED 310.I version using current transformers.
B = M-Bus module
The meter is equipped with a display and M-Bus communication module. Alternatives include “0” without an additional module or “M” with an RS-485 module.
Optical communication
The Meter 3f ED 310.DB HWG also features optical communication according to EN 62056-21.
ODB measurement direction
The ODB symbol indicates the “consumption” measurement direction; ODB/DOD stands for consumption and delivery. The exact measurement direction is defined in the customer data sheet.
Integration with HW-group energy solutions
The Meter 3f ED 310.DB HWG can be integrated into HW-group energy monitoring solutions.
Perseus Energy 242
Compatible HWg monitoring device for connecting energy meters.
Perseus Energy 285
Compatible HWg monitoring device for connecting energy meters.
HWg-PWR3 / HWg-PWR12 / HWg-PWR25
Additional compatible HWg devices for reading the meter via M-Bus.
Commissioning in a few steps
The Meter 3f ED 310.DB HWG is permanently installed on a DIN rail and read via M-Bus.
- Mount the meter on the DIN rail.
- Connect the voltage terminals L1, L2, L3, and N directly according to the ED 310.DB wiring diagram.
- Connect the M-Bus wiring to one of the two identical RJ45 sockets with the correct polarity for Rx/Tx+ and Rx/Tx-. Additional meters can be connected in series.
- Ensure that the M-Bus module is powered by the M-Bus master via the two-wire connection (24–36 V DC).
- Check the factory parameter settings, including tariffs, address, and baud rate, in programming mode. Changes are password-protected by the manufacturer (access level 3).
- Test reading via M-Bus or optical probe and adjust the communication speed from 300 to 9,600 Bd if required.
Why the Meter 3f ED 310.DB HWG is the right choice
Certified accuracy
Class A or B according to EN 50470-1/-3.
Centralized remote reading
Via M-Bus with a range of up to 1,000 m.
Multi-tariff capable
Up to four switchable tariffs.
Space-saving
Compact DIN-rail housing measuring 107 x 91 x 71.5 mm.
Versatile reading options
M-Bus, optical interface, and S0 output.
Reliable in control cabinets
-25 °C to +55 °C, IP20 protection.
Practical examples
- Energy submetering in commercial and residential buildings via a central M-Bus
- Remote reading of large properties in combination with Perseus Energy 242/285 or HWg-PWR3/12/25
- Automation and control applications, such as controlling street lighting via M-Bus
- High/low-tariff billing using external tariff switching
- On-site plausibility checks via the calibration LED and S0 output
Frequently asked questions
What is the Meter 3f ED 310.DB HWG?
The Meter 3f ED 310.DB HWG is a static, multi-phase electricity meter with a display and M-Bus communication module. It is designed for direct connection to 3 x 230/400 V systems up to 63 A and is used to measure and remotely read energy consumption.
How accurately does the meter measure?
The meter achieves accuracy class A or B according to EN 50470-1 and EN 50470-3 and remains highly accurate even when only one or two phases are connected.
How is the M-Bus module powered?
The M-Bus module is galvanically isolated from the rest of the meter and is powered directly via the two-wire M-Bus communication line (24–36 V DC). A separate power supply for the module is not required.
What distance can be covered via M-Bus?
Depending on the selected communication speed, distances between 350 m and 1,000 m can be covered.
How many tariffs does the meter support?
Up to four tariffs can be selected via up to three external inputs. The active tariff is shown on the display.
What other reading options are available besides M-Bus?
The meter also provides an optical interface according to EN 62056-21 for local reading via an optical probe, as well as a programmable S0 pulse output according to EN 62053-31.
Which HWg devices are compatible with the meter?
The Meter 3f ED 310.DB HWG is compatible with Perseus Energy 242, Perseus Energy 285, and HWg-PWR3/12/25.
How and where is the meter installed?
The meter is installed on a DIN rail inside a control cabinet. The housing measures 107 x 91 x 71.5 mm and weighs approximately 0.4 kg without or 0.5 kg with the communication module. Operation is permitted at -25 °C to +55 °C without condensation; the protection rating is IP20.
Questions about the Meter 3f ED 310.DB HWG?
Our support team in Germany provides free advice on product selection, sensors, and configuration.
HW-group Meter 3f ED 310.DB HWG
General Data
- Three-phase electricity meter
- Direct measurement via a four-wire connection or indirect measurement via current transformers
- Accuracy class: Class A according to EN 50470-1 / EN 50470-3
- Test LED meter constant: programmable, default 10,000 pulses/kWh
- Connection: direct four-wire / indirect via current transformers
- Reference voltage (Un): 3 × 230 / 400 V
- Operating voltage range: 0.75 Un to 1.15 Un
- Nominal frequency: 50 Hz
- Operating frequency range: 45–55 Hz
Current Measurement
- Starting current Ist: <15 mA direct / 5 mA indirect
- Minimum current Imin: 200 mA direct / 50 mA indirect
- Transition current Itr: 500 mA direct / 250 mA indirect
- Reference current Iref for direct connection: configurable to 5 A or 10 A
- Nominal current In for indirect connection: 5 A
- Maximum current Imax for direct connection: continuously configurable in whole-number multiples of Ib, from 40 A to 63 A
- Maximum current Imax for indirect connection: configurable to 6 A or 7.5 A
- Maximum measurement range: 15 mA to 63 A direct / 5 mA to 7.5 A indirect
Power Consumption
- Power consumption per voltage path without an inserted module: maximum 0.7 W, maximum 8 VA capacitive
- Power consumption per current path: maximum 0.01 VA
Tariff Switching
- External terminals for tariff switching
- Switching voltage Ut: 230 V
- Permitted switching voltage range: 0.75 Ut to 1.15 Ut
- Maximum consumption at Ut = 230 V: 1.5 mA
S0 and Test LED Output
- Test LED according to Class A under EN 62053-31
- S0 output: direct, two-wire open-collector output
- Pulse rate: programmable from 0.15 to 10,000 pulses/kWh
- Default value: 10,000 pulses/kWh
- Pulse width: programmable, default 40 ms
- Supply voltage: 24 V DC nominal / 30 V DC maximum
- Output current: 5–15 mA DC
- Maximum cable length: 1,000 m
RS-485 Communication
- Module supply voltage range: 12–24 V DC or 12–18 V AC
- Recommended supply voltage: 12 V DC
- Power consumption in idle mode: 10 mA
- Power consumption during communication: 50 mA
M-Bus Communication
- M-Bus module supply voltage range: 24–36 V DC
Environmental Conditions
- Operating temperature: -25 to +55 °C
- Storage / operation: without condensation
- Protection rating: IP20
- Mechanical environment: M1
- Electromagnetic environment: E2
Resistance and EMC
- Resistance to voltage impulses: 8 kV
- Impulse shape: 1.2 μs / 50 μs according to EN 50470-01
- Electrostatic discharges: 8 kV
- Number of discharges: 10 according to EN 50470-01
- High-frequency electromagnetic field: according to EN 50470-01
- Severity level: 3, vertical and horizontal polarization
-
Fast transient disturbances:
- Pulse-burst length: 15 ms
- Pulse-burst period: 300 ms
- Test duration: 60 s
- Test voltage: 4 kV
-
Radio interference suppression:
- Conducted interference peak: 0.15–30 MHz
- Electromagnetic field peak: 30–2,000 MHz
- Immunity to conducted RF disturbances according to EN 61000-4-6: 0.15–80 MHz
Mechanical Data
- Weight without module: approx. 0.4 kg
- Weight with module: approx. 0.5 kg
- Dimensions (W × H × D): 107 × 91 × 71.5 mm
- Mounting: DIN rail
- Installation position: any
Connection Data
-
Maximum conductor cross-section – solid conductor:
- Direct: 25 mm²
- Indirect: 6 mm²
-
Maximum conductor cross-section – stranded conductor:
- Direct: 16 mm²
- Indirect: 4 mm²
-
Connection screws:
- Direct: M5
- Indirect: M3.5
- Screwdriver: Type Z, size 2
-
Tightening torque:
- Direct: 2–3 Nm
- Indirect: 1 Nm
- Terminal / connection diameter: 7.2 mm direct / 4 mm indirect
Additional Data
- Additional technical parameters according to EN 50470-1 and EN 50470-3
Manufacturer information:
HW group s. r. o.
Rumunská 26
Prague, 120 00
Czech Republic
Phone: +420 222 511 918
Email: sales@hwg.cz
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
