PRO1-Mod 0.25-45A ModBus MID – Single-phase energy meter
€109.00
MID-certified single-phase energy meter with Modbus
The HW group PRO1-Mod 0.25–45A ModBus MID is a static single-phase active energy meter for direct measurement up to 45 A. It belongs to the Inepro PRO1 series and is certified according to the EU Measuring Instruments Directive 2014/32/EU (MID), which means it may also be used for legally regulated billing purposes.
In addition to the LCD display showing instantaneous values such as voltage, current, active, reactive and apparent power, frequency and power factor, the Mod variant features an RS485 interface with Modbus RTU protocol for central remote reading. This makes the meter particularly suitable for energy submetering in combination with higher-level HWg monitoring systems.
Precise measurement, Modbus remote reading
The PRO1-Mod 0.25–45A ModBus MID delivers calibrated measurement values and also provides them digitally via Modbus RTU.
230 V, 5(45) A
Single-phase direct connection, accuracy class B (1 % accuracy) according to EN 50470-1/-3.
MID certified
EU type examination certificate T11037, compliant with Directive 2014/32/EU – suitable for legal metrology applications.
Modbus RTU via RS485
Baud rate up to 9600 Bd, address range 1–247, range up to 1000 m.
LCD with scroll function
Automatic or button-controlled scrolling through all measured values, including backlight.
Infrared interface
Local reading via infrared head according to IEC 62056-21:2002 (IEC1107), 900–1000 nm, direct contact.
S0 pulse output
Optically isolated open-collector output, pulse rate freely programmable.
How the PRO1-Mod 0.25–45A ModBus MID is constructed
The series DIN housing made of flame-retardant PC plastic measures 17.5 x 117 x 63 mm (W x H x D), height without protective cover 90 mm, weight approx. 0.08 kg.
Measurement system and accuracy
Nominal voltage Un 230 V AC with an operating range of 195–253 V AC. Base current (Ib) 5 A, maximum rated current (Imax) 45 A, operating current range 0.4 % Ib to Imax. The meter achieves accuracy class B according to EN 50470-1/-3 (equivalent to 1 % accuracy) and complies with the basic error limits of ±1.5 % at 0.05 Ib and ±1.0 % between 0.1 Ib and Imax (each at cos φ = 1, 0.5L or 0.8C). The operating frequency is 50 Hz ±10 %, internal power consumption is max. 2 W or 10 VA per phase.
Overcurrent withstand and insulation
The meter can temporarily withstand 30 times Imax for 0.01 s. The insulation withstands 4 kV AC test voltage for 1 minute as well as surge voltages of 6 kV (1.2/50 µs wave); the protection class is II (double insulated). The housing achieves protection class IP51 and is designed for mechanical environmental class M1 and electromagnetic environmental class E2 according to 2014/32/EU.
Connection and terminals
Connection is made via terminals 1 (phase in, L-IN), 3 (phase out, L-OUT), 4 (neutral in, N) and 6 (neutral out, N); the maximum terminal diameter for conductors is 8 mm² (solid copper). Terminals 20/21 carry the S0 pulse output, terminals 23/24 the Modbus communication (RS485, on the Mod variant via two identical RJ45 sockets for daisy-chaining to further meters). The meter stores all meter readings in a non-volatile memory for more than 10 years.
Display and control button
The two-line LCD shows direction and communication indicators in the upper line and the actual measured values in the lower line. A red LED flashes proportionally to the measured active power (standard 10,000 impulses/kWh) and indicates the energy direction (import/export) via the FW/RV symbol. By pressing the button (1, 3 or 5 seconds) you can scroll through all data pages or call up the programming menu; without operation the display automatically returns to scroll mode after 30 seconds (standard cycle time 10 seconds, adjustable 1–30 seconds). The display backlight can be configured to On/Off/Button mode.
Modbus RTU and infrared communication
The Mod variant communicates via RS485 using the Modbus RTU protocol (16-bit CRC). Factory settings are address 01 and baud rate 9600 Bd (8 data bits, even parity, 1 stop bit); baud rate (1200/2400/4800/9600 Bd), parity (even/none/odd) and Modbus ID (1–247) can be changed on the device via a key combination and a 4-digit password. The maximum bus load is 60 meters per bus, the range up to 1000 m. For test setups via a serial converter without a complete Modbus infrastructure, the manufacturer recommends an additional termination resistor (120 Ω/0.25 W) at terminals 23/24. In addition, an infrared interface according to IEC 62056-21:2002 (IEC1107, 900–1000 nm, direct contact) is available for local reading via an infrared head to a PC.
S0 pulse output
The galvanically isolated, optically isolated S0 output (open collector) requires an external voltage source of 5–27 V DC at pin 20 (collector) and the signal wire at pin 21 (emitter); the maximum switching current is 100 mA. The pulse rate is programmable between 10,000, 2,000, 1,000, 100, 10, 1, 0.1 and 0.01 imp./kWh, the pulse width is 32 ms for powers up to 5625 W and 11.2 ms above that.
Read measured values directly via Modbus RTU
Via the RS485 interface (function code 03, read; function code 06/10, write) the meter provides extensive registers for instantaneous and energy values.
Instantaneous values (from register 5000)
Voltage, current, mains frequency, active, reactive and apparent power as well as power factor, each as Float ABCD.
Energy values (from register 6000)
Total, forward and reverse active and reactive energy per tariff, in kWh or kvarh.
Device information (from register 4000)
Serial number, firmware/hardware version, combination code, error code and power-down counter.
Writable parameters
Modbus ID, baud rate, parity, LCD cycle time, S0 output rate and combination code can be remotely configured via function code 06/10.
Legally compliant according to EU Measuring Instruments Directive
The PRO1-Mod is part of the PRO1 series (PRO1-S, PRO1-2T, PRO1-Mb, PRO1-Mod) tested by NMi Certin B.V.
EU type examination certificate
Certificate number T11037, issued by NMi Certin B.V., valid until 3 April 2027.
Declaration of conformity
Conformity with Directive 2014/32/EU, measuring range 230 V, 5(45) A, 50 Hz, 10,000 imp./kWh.
Measuring instrument standard
Static active energy meter of accuracy class B according to EN 50470-1 and EN 50470-3.
CE marking
Declaration of conformity according to EN 50470 as a single-phase DIN rail watt-hour meter.
Commissioning in a few steps
The PRO1-Mod 0.25–45A ModBus MID is installed on a 35 mm DIN rail and read out via RS485/Modbus.
- Mount the meter on a 35 mm DIN rail, ideally in a suitable IP-protected control cabinet environment
- Wire the phase conductor to terminal 1 (L-IN) and 3 (L-OUT), neutral conductor to terminal 4 (N) and 6 (N) according to the connection diagram; provide external fuse or circuit breaker on the phase side
- Connect RS485 wiring to one of the two RJ45 sockets (terminals 23/24) with correct polarity; further meters can be connected in series (max. 60 meters per bus, up to 1000 m)
- Check factory settings: Modbus address 01, baud rate 9600 Bd, 8 data bits, even parity, 1 stop bit; adjust if necessary via the control button and the 4-digit password (default 0000)
- Attach the protective cover and seal the meter after successful testing
- Test reading via Modbus RTU (function code 03) or alternatively via the infrared head
Why the PRO1-Mod 0.25–45A ModBus MID is the right choice
MID certified
Suitable for legally regulated billing purposes.
Calibrated accuracy
Class B according to EN 50470-1/-3.
Modbus RTU remote reading
Up to 247 meters addressable, 1000 m range.
Space-saving
Only 17.5 mm width on the DIN rail.
Versatile reading options
Modbus RTU, infrared and S0 pulse output.
Long-term storage
Meter readings remain stored for over 10 years without power.
Practical application examples
- Legally compliant submetering of individual rental units or consumers
- Central remote reading of multiple meters via a common Modbus RS485 bus
- Energy monitoring in combination with higher-level HWg monitoring systems
- Load profile recording and power monitoring in commercial properties
- On-site verification via infrared head or optical test LED
Frequently asked questions
What is the PRO1-Mod 0.25–45A ModBus MID?
The PRO1-Mod is a static, MID-certified single-phase active energy meter for direct connection up to 45 A with LCD display and RS485 interface for remote reading via Modbus RTU.
Is the meter legally compliant?
Yes. The meter has an EU type examination certificate (No. T11037) according to the Measuring Instruments Directive 2014/32/EU and achieves accuracy class B according to EN 50470-1/-3.
How is the meter read via Modbus?
Via RS485 using the Modbus RTU protocol (16-bit CRC). Factory setting: address 01, 9600 Bd, 8 data bits, even parity, 1 stop bit. Voltage, current, power and energy values are available as readable registers (function code 03).
How many meters can be operated on one bus?
Up to 60 meters per bus with a maximum range of 1000 m, individually addressable via Modbus addresses 1–247.
How is the S0 output connected?
The optically isolated open-collector output requires an external voltage source of 5–27 V DC at terminal 20 (collector) and the signal wire at terminal 21 (emitter); the pulse rate is programmable between 0.01 and 10,000 imp./kWh.
Can the meter be read locally without Modbus?
Yes, in addition to Modbus, an infrared interface according to IEC 62056-21:2002 (IEC1107) is available for local reading via an infrared head.
How and where is the meter installed?
The meter is installed on a 35 mm DIN rail, is only 17.5 mm wide and weighs approx. 0.08 kg. The permissible operating temperature range is -25 °C to +55 °C, protection class IP51; a suitable IP-protected control cabinet environment is recommended.
What happens to the meter readings after a power failure?
All meter readings are stored in non-volatile memory and remain preserved for more than 10 years without power supply; in addition, a power-down counter records the number of shutdowns.
Questions about the PRO1-Mod 0.25–45A ModBus MID?
Our support team in Germany will advise you free of charge on selection, sensors and configuration.
HW-group PRO1-Mod 0.25–45A ModBus MID
General Data
- Single-phase energy meter up to 45 A
- MID-approved energy meter
- Communication via RS-485 / Modbus RTU
- Housing: flame-retardant PC plastic
- Nominal voltage (Un): 230 V AC
- Operating voltage: 195–253 V AC
- International standard: EN 50470-1/3
- Accuracy class: B (1 % accuracy)
Electrical Data
- Base current (Ib): 5 A
- Maximum rated current (Imax): 45 A
- Operating current range: 0.4 % Ib to Imax
- Overcurrent withstand: 30 × Imax for 0.01 s
- Operating frequency: 50 Hz ±10 %
- Self-consumption: ≤2 W/phase or ≤10 VA/phase
Insulation Strength
- AC voltage withstand: 4 kV for 1 minute
- Impulse voltage withstand: 6 kV, 1.2 μs waveform
- Protection class: II
Pulse Outputs
- Test output via red LED: 10,000 imp./kWh
- Pulse rates: 10,000 / 2,000 / 1,000 / 100 / 10 / 1 / 0.1 / 0.01 imp./kWh
- Pulse width at ≤5,625 W: 32 ms
- Pulse width at >5,625 W: 11.2 ms
Measurement Accuracy
- At 0.05 Ib, Cos φ = 1: ±1.5 %
- At 0.1 Ib, Cos φ = 0.5L: ±1.5 %
- At 0.1 Ib, Cos φ = 0.8C: ±1.5 %
- At 0.1 Ib to Imax, Cos φ = 1: ±1.0 %
- At 0.2 Ib to Imax, Cos φ = 0.5L: ±1.0 %
- At 0.2 Ib to Imax, Cos φ = 0.8C: ±1.0 %
Data Storage
- Data storage for more than 10 years without power supply
RS-485 / Modbus Communication
- Bus type: RS-485
- Protocol: MODBUS RTU with 16-bit CRC
- Baud rates: 1,200 / 2,400 / 4,800 / 9,600 Baud
- Standard baud rate: 9,600 Baud
- Address range: 1–247, user-configurable
- Maximum bus load: 60 meters per bus
- Range: 1,000 m
Infrared Interface
- Infrared wavelength: 900–1,000 nm
- Communication distance: direct contact
- Protocol: IEC 62056-21:2002 (IEC1107)
Environmental Conditions
- Permissible operating humidity: ≤75 %
- Permissible storage humidity: ≤95 %
- Operating temperature: -25 to +55 °C
- Storage temperature: -30 to +70 °C
- Protection class: IP51
Dimensions & Weight
- Height without protective cover: 90 mm
- Height: 117 mm
- Width: 17.5 mm
- Depth: 63 mm
- Weight: 0.08 kg net
Connection Data
- Maximum conductor cross-section of power connections: 8 mm²
- Suitable for solid copper conductors
Further Data
- MID-approved
- Protection against ingress of dust and water: IP51
- The maximum number of meters per bus depends on the installation conditions and the communication technology used.
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
