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  • New item   Modular three-phase energy meter | 100 A | 3×230/400 V | DIN | Ollo 3P-351

    Modular three-phase energy meter | 100 A | 3×230/400 V | DIN | Ollo 3P-351

    Code: 3P-351
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    Ollo 3P-351 – a modular three-phase electricity meter, connected directly up to 100 A and DIN rail mounted. It counts consumed active energy on a 7-digit display accurate to a tenth of a kWh, while four LED indicators and a pulse output (terminals 23 and 24) allow the status to be monitored and data to be passed to an external system. Designed for internal metering in residential, commercial and industrial premises with a three-phase network.

  • Product description

    Modular three-phase electricity meter | 100 A | 3×230/400 V | DIN | Ollo 3P-351

    Ollo 3P-351 – a modular three-phase electricity meter, connected directly up to 100 A and DIN rail mounted. It counts consumed active energy on a 7-digit display accurate to a tenth of a kWh, while four LED indicators and a pulse output (terminals 23 and 24) allow the status to be monitored and data to be passed to an external system. Designed for internal metering in residential, commercial and industrial premises with a three-phase network.

    Key idea:
    When you need to know how much a specific object consumes – a flat in an apartment block, a rented workshop, a heat pump or a production line – the main supply meter does not give the answer. The 3P-351 is a simple, reliable solution for sub-metering: no communication modules or apps, just an accurate kWh reading on the display and a pulse output that can be connected to a meter concentrator or controller. Direct connection up to 100 A covers most 3x25–3x63 A supplies without current transformers.
    Rated current
    3x20 (80–100) A, direct connection
    Rated voltage
    3×230/400 V AC, 50–60 Hz
    Output
    pulse, terminals 23 and 24
    Standards / mounting
    IEC 62052, IEC 62053-21; DIN rail

    How it works

    The meter is connected in series into the three-phase line: phases L1, L2, L3 and neutral enter the upper terminals (supply), the load is connected to the lower terminals (output). Direct connection means that the entire load current up to 100 A flows through the internal measuring elements, so current transformers are not needed. The measuring circuit calculates active power from the voltage and current of each phase, integrates it over time and accumulates the consumed energy on a 7-digit display – the last digit shows tenths of a kWh, so even small changes in consumption are visible.

    Four LED indicators (yellow, green, red and flashing) show the meter's status and operation – the flashing indicator reflects current consumption with pulses: the more often it flashes, the higher the load. The pulse output via terminals 23 and 24 passes the same pulses to an external device – a pulse counter, a PLC or a building management system, which derives the kWh value from the pulse count. The meter complies with the IEC 62052 and IEC 62053-21 (electronic active-energy meters) standards.

    What makes the Ollo 3P-351 worthwhile?
    It is a meter without unnecessary extras: a compact DIN housing, a clear reading, LED status indication and a pulse output for passing on data. It provides sub-metering wherever a network meter is missing or not sufficient, and it requires neither internet access nor configuration.

    Technical specifications

    Model Ollo 3P-351
    Product type Three-phase electricity meter, modular
    Rated voltage 3×230/400 V AC, 50–60 Hz
    Rated current 3x20 (80–100) A, direct connection
    Output pulse, terminals 23 and 24
    Standards / mounting IEC 62052, IEC 62053-21; DIN rail
    Accuracy class Class 1
    Display 7 digits, last digit – tenths of a kWh
    Indicators 4 LEDs (yellow, green, red, flashing)
    Terminal layout Top – input (supply), bottom – output (load)
    Operating temperature -10…+55 °C
    Dimensions (L x W x H) 100 x 76 x 65 mm
    Weight 380 g
    Communication interface None (pulse output only)
    MID approval Not specified – check manufacturer's datasheet

    Key features

    • Active energy measurement – accumulation of consumption in a three-phase system with a tenth-of-a-kWh reading.
    • Direct connection up to 100 A – no current transformers, suitable for most domestic and commercial supplies.
    • 7-digit display – shows up to 999,999.9 kWh, sufficient for many years of metering.
    • LED status indication – four indicators show operation and load intensity.
    • Pulse output – terminals 23 and 24 for passing consumption data to an external system.
    • DIN mounting – compact housing for a standard board, with a clear input/output terminal layout.

    Where is it used?

    • Sub-metering of flats in apartment blocks and terraced houses
    • Rented workshops, warehouses and retail units
    • Branch circuits for heat pumps, boiler rooms and EV chargers
    • Monitoring energy consumption of production lines and workshops
    • Internal metering for garden-plot associations and garage cooperatives
    • Farm buildings – pump rooms, dryers, workshops
    • Building management systems where consumption is collected via pulses

    Use by need

    For the domestic user.
    If you want to know how much a heat pump, sauna or a rented part of the house consumes, the 3P-351 is installed in that branch's board and shows consumption to a tenth of a kWh – without any apps or internet.
    For businesses and industry.
    In a multi-tenant building or a production facility, the meter allows energy costs to be split by department or equipment. Once the pulse output is connected to a controller, data flows into the building management system for centralised monitoring.
    For electricians / engineers.
    Direct connection up to 100 A – no current transformers needed, but a circuit breaker sized to the conductor is required upstream of the meter. Follow the terminal layout (supply at the top, load at the bottom) and phase order. If billing metering is required for the object, check for MID approval in the manufacturer's datasheet – it is not stated in the source.

    Practical example

    In a two-flat house with a shared 3x40 A supply, the second flat is rented out. A 3P-351 is installed in its branch board behind a 3x25 A breaker. Over a month, the display shows 412.6 kWh – the owner uses this figure to bill the tenant under a private agreement, and the flashing LED makes it immediately obvious if the flat is drawing power when it should be empty. Terminals 23 and 24 are connected to a pulse counter that logs monthly readings together with water and heat meters.

    Pros

    • Simple and reliable – no configuration, no internet, a reading is available right after installation.
    • Direct connection up to 100 A – covers most supplies without current transformers.
    • Tenth-of-a-kWh accuracy on the display – even small changes in consumption are visible.
    • Pulse output – data can be passed to a concentrator or PLC.
    • LED indication – load and status visible from a distance.
    • Compact DIN housing – 100 x 76 x 65 mm, fits a standard board.

    Cons / limitations

    • No communication interface (RS485, Wi-Fi) – remote reading requires a pulse counter or controller at terminals 23 and 24.
    • Single tariff only – does not calculate day and night tariffs separately.
    • MID approval is not stated in the manufacturer's data – for billing metering with a supplier, confirm this in the manufacturer's datasheet.
    • Up to 100 A – larger supplies require a CT-operated meter.
    • Three-phase networks only – a single-phase branch requires a single-phase model.

    Safety and installation notes

    • Install only with the voltage disconnected and its absence verified; the meter is connected to all three phases and neutral.
    • A circuit breaker sized to the conductor cross-section is required upstream of the meter – the meter does not provide protection against overload or short circuit.
    • Follow the terminal layout: supply – upper terminals, load – lower terminals; if reversed, the reading will be incorrect.
    • Connect the neutral without fail – without it, phase voltages and measurement are distorted.
    • The pulse-output terminals 23 and 24 are a low-voltage circuit – do not connect them to mains voltage.
    • Operate at -10…+55 °C; in outdoor boards ensure protection against frost and condensation.

    Quick selection guide

    Rated current
    3x20 (80–100) A, direct connection
    Rated voltage
    3×230/400 V AC, 50–60 Hz
    Output
    pulse, terminals 23 and 24
    Standards / mounting
    IEC 62052, IEC 62053-21; DIN rail
    Suitable when you need:
    • sub-metering of a three-phase object up to 100 A without current transformers;
    • a simple meter without communication modules or configuration;
    • a pulse output to pass data to a controller or concentrator.
    Check before use:
    • whether the supply current does not exceed 100 A;
    • whether a circuit breaker is fitted upstream of the meter;
    • whether the network is three-phase 3×230/400 V with a neutral;
    • whether MID approval is required for the object – if so, check the datasheet.
    Important reminder:
    The meter only measures energy – it protects neither the wiring nor the equipment. A circuit breaker upstream is essential, and for billing with a supplier only an MID-approved meter is suitable.

    FAQ

    Are current transformers needed?
    No – it is a direct-connection meter up to 100 A, conductors connect directly to the terminals.
    Can it be connected to a computer or an app?
    There is no communication interface; for remote reading use the pulse output (terminals 23 and 24) with a pulse counter or PLC.
    Does it count two tariffs?
    No – a single, combined kWh reading is accumulated.
    Is it suitable for billing with an energy supplier?
    That requires MID approval, which is not stated in the manufacturer's data – check the datasheet; it is suitable for internal metering and private agreements.
    What does the flashing LED indicate?
    Consumption pulses – the greater the load, the more often it flashes.
    Is it suitable for a single-phase branch?
    No, the model is designed only for three-phase 3×230/400 V networks.

    Modular three-phase electricity meter | 100 A

    Ollo 3P-351 – a modular three-phase energy meter, 3x20 (80–100) A, 3×230/400 V, direct connection, with a 7-digit display (tenths of a kWh), four LED indicators and a pulse output (terminals 23 and 24), complying with IEC 62052 and IEC 62053-21. Designed for sub-metering in flats, rented premises, production branches and building management systems, wherever a reliable kWh reading is needed from a DIN board.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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