3-Phase Meter PRO380-Mb x/5A M-Bus – for Current Transformers

The MID-certified three-phase meter for operation with current transformers

The HW group Meter 3f PRO380-Mb x/5A M-Bus is a static three-phase energy meter for indirect measurement via external current transformers (CTs) with an M-Bus interface. It measures and displays a range of instantaneous values, including voltage, current, active power, reactive power, apparent power, mains frequency and power factor – some of these values on the LCD display and others additionally via M-Bus.

MID-compliant for billing purposes: The PRO380-Mb x/5A complies with the Measuring Instruments Directive (MID) 2014/32/EU. This MID approval confirms the meter’s accuracy and quality and permits its use for billing purposes, for example in consumption-based cost allocation in multi-unit buildings.

For indirect measurement with current transformers: Unlike the direct-measurement version, this meter is not connected directly to the full load current. Instead, it is connected to external current transformers (CTs), which reduce the primary current to a secondary current of x/5A. This also makes the meter suitable for considerably higher currents than direct measurement would allow. The PRO380 series is also available as a standard version, a dual-tariff version, and with M-Bus and pulse output.

Indirect measurement, M-Bus and pulse output in one device

The PRO380-Mb x/5A combines precise energy measurement via current transformers with several data transmission options.

How the PRO380-Mb x/5A is designed

The PRO380-Mb x/5A is housed in flame-retardant PC plastic and is designed for installation on a 35 mm DIN rail.

Set the current transformer ratio before commissioning

When switched on for the first time, the meter automatically prompts for the CT ratio.

• After switching on, the display shows “SEt Ct – CTx 0005”
• Select the secondary current /1 or /5
• Confirm by holding both buttons simultaneously for 3 seconds
• Enter the four-digit primary current (0001–9999)
• Confirm each digit individually by holding both buttons for 3 seconds
• The CT ratio is permanently stored after the final digit has been confirmed

What the PRO380-Mb x/5A displays

The meter displays a wide range of instantaneous values, individually for each phase and as a total value.

• Voltage for each phase (L1, L2 and L3)
• Current for each phase (L1, L2 and L3), based on the programmed CT ratio
• Total and phase-specific active power
• Total and phase-specific reactive power
• Total and phase-specific apparent power
• Total and phase-specific power factor (COS)
• Mains frequency
• Active and reactive energy, each as total, forward and reverse energy

For energy consumption, the display shows up to 99999.99 kWh and automatically changes to the format 999999.9 kWh above this value. A daily counter for forward energy is also available and can be reset by the user.

Digital reading in accordance with EN13757-3

The M-Bus interface digitally transmits meter data to a higher-level system, such as an M-Bus level converter or an HW group device with an M-Bus master.

• Factory baud rate 2400, adjustable to 300/600/1200/4800/9600
• Data format: 8 data bits, even parity, 1 stop bit (fixed and not changeable)
• Range up to 1000 m, cable type JYSTY (nx2x0.8)
• Up to 64 meters on one M-Bus line, depending on the level converter, baud rate and installation conditions
• Factory primary address 00; secondary address preset to the last 8 digits of the serial number
• Primary and secondary addresses and the baud rate can be changed via infrared or M-Bus

Display, buttons and configuration

The display and numerous settings can be controlled directly on the meter using the buttons.

• Automatic page change every 10 seconds, adjustable from 1 to 30 seconds
• Manual scrolling through all display pages using the buttons
• Individual measured values can be added to or removed from the automatic display sequence
• Backlight optionally permanently on, off or activated by pressing a button
• Total energy calculation method (Combination Code) selectable from seven options, such as forward only, reverse only or forward minus reverse
• Configuration menu (Program mode 3) protected by a four-digit password, factory setting 0000

Installation on a DIN rail

• Installation on a 35 mm DIN rail inside a control cabinet
• Installation only by qualified personnel
• Installation on a fire-resistant wall in a dry and well-ventilated environment
• Installation in an additional protective enclosure in dusty or otherwise contaminated environments
• After installation, the meter should be sealed to protect it against tampering
• Use of surge protection is recommended in environments with frequent voltage spikes, for example due to thunderstorms or welding equipment

For reliable continuous operation in control cabinets

• Operating temperature from -25 °C to +55 °C at 0 to 75 % relative humidity
• Storage temperature from -25 °C to +55 °C at 5 to 95 % relative humidity
• Accuracy class B (corresponding to 1 % measurement accuracy)
• IP51 protection against dust and dripping water
• Insulated, encapsulated meter with protection class II
• MID-certified in accordance with 2014/32/EU, dielectric strength 4 kV for 1 minute and impulse withstand voltage 6 kV
• 24-month manufacturer’s warranty

What is included in the delivery

Please check the delivery for completeness upon receipt and report any missing or damaged parts to your supplier immediately.

• Meter 3f PRO380-Mb x/5A M-Bus1 unit

Why the PRO380-Mb x/5A is a suitable choice

Practical application examples

• Consumption measurement on main supply lines with currents above the direct-measurement limit
• Consumption-based billing in commercial and industrial buildings with existing current transformers
• Sub-metering of individual outgoing circuits in transformer stations or main distribution boards
• Integration into building management and energy management systems via M-Bus
• Centralised acquisition of several meters via an M-Bus master such as HWg-PWR or Perseus Energy

Frequently asked questions