Energy meters on a white seamless bench: a four-module three-phase DIN-rail meter standing in front with a 96x96 panel meter leaning behind it, a single-module meter and a stripped RS-485 twisted pair beside them

Metering since 2009

DIN-rail and panel energy meters for switchgear builders

Request a quote See the six models

Six models, Class 1 to 0.5S, Modbus RTU standard. Calibrated per unit in Qingdao.

Product range

Six meters in three mounting ways

Rail, panel and system-side, in one catalogue. Stock held for every model.

Single-module single-phase DIN-rail energy meter, light grey enclosure and dark display, shot at 45 degrees on a white seamless background

WHM-D100Single-phase DIN-rail meter1 module · DIN 43880 (17.5 mm)5(80) A · Class 1 · Modbus RTU

Four-module three-phase DIN-rail energy meter with its terminal row and rail clip visible, shot at 45 degrees on a white seamless background

WHM-D300Three-phase DIN-rail meter4 modules · DIN 43880 (70 mm)5(100) A · Class 0.5S · Modbus RTU

96 x 96 square multifunction panel meter with four keys and a dark display, shot at 45 degrees on a white seamless background

WHM-P96Multifunction panel meter 96 × 9692 × 92 mm cutoutClass 0.5 · RS-485 · 2 DI / 1 relay

72 x 72 compact panel meter with a three-row digital window, shot at 45 degrees on a white seamless background

WHM-P72Compact panel meter 72 × 7268 × 68 mm cutoutClass 1 · RS-485 Modbus RTU

Power quality recorder with an Ethernet port and a USB port on the side, shot at 45 degrees on a white seamless background

WHM-Q200Power quality recorderEN 61000-4-30 Class SHarmonics to the 63rd · 8 GB log

Energy data gateway, a small DIN-rail box with two status LEDs and a serial terminal, shot at 45 degrees on a white seamless background

WHM-G40Energy data gatewayUp to 64 meters downstreamModbus RTU master · Modbus TCP · MQTT

Wide view of the assembly and calibration shop: a row of fixtures holding freshly assembled three-phase DIN-rail meters, one worker in a light grey uniform seen from behind at the bench

Flagship meter

WHM-D300: 0.5S three-phase metering

Bidirectional active and reactive energy at billing accuracy. Register map before you wire.

Mounting: 4 modules · DIN 43880 (70 mm)
Current: 5(100) A direct or …/5 A CT
Accuracy: Class 0.5S · IEC 62053-22
Interface: Modbus RTU · 2 pulse out · 2 tariff in

See the WHM-D300 page

Calibration and test

Where the meters are calibrated

The bench, the burn-in rack and the EMC room are all under one roof.

See the calibration room

SMT line: a board coming out of the reflow oven on the conveyor, feeders and reels alongside, cool white industrial lighting

SMT and assembly

Three SMT lines and in-house enclosure tooling, 12,600 m², 1.2 million meters a year. Boards are tested in circuit before the bench.

Calibration

Every unit is compared against a 0.02 % reference rig and sealed before packing, with the record kept by serial number.

Burn-in rack filled with powered energy meters, a few red status LEDs lit, wire harnesses hanging along the side

Burn-in and EMC

Monitoring models take 4 h of burn-in, and there is an in-house EMC pre-compliance room for IEC 61000-4-2, -4 and -5 before a model goes to a third-party lab.

Wide shop floor panorama: three SMT lines receding into the depth of the hall with the assembly and packing area at the far end, cool white ceiling light on a neutral grey floor, nobody in frame

IEC 62052-11 / 62053-21 · -22 · -23EN 50470-1 / -3 · MID module B+DCE · EMC 2014/30/EU · LVD 2014/35/EUEN 61000-4-30 Class SUL 61010-1ISO 9001:2015

World map made of evenly spaced small grey dots on a plain white ground, the continents readable only from the presence of dots, no borders and no labels, one tiny cluster of red dots over East Asia

Export

Shipped to 46 countries

Since 2011: EU, UK, Türkiye, Middle East, South-East Asia, South America

See where the meters ship

Applications

Where the meters go

Isometric technical line drawing of a switchgear cabinet: a row of DIN-rail meters and one square panel meter inside the door, busbars and outgoing terminals below; black thin strokes on white with a single red element; no text and no dimension lines

Switchgear panels

Standard cutouts and a Modbus map you get before the panel is wired, so the meter is a line item on the drawing and not a surprise at commissioning.

Isometric technical line drawing of a commercial building sub-metering topology, from the main meter up to floor meters and a gateway; black thin strokes on white with a single red communication line; no text

Commercial sub-metering

Class 0.5S tenant billing with two tariff inputs, one gateway per riser, and CSV or Modbus TCP out to the building system that raises the invoices.

Isometric technical line drawing of a PV and battery grid-connection point with modules, inverter, battery cabinet and one connection meter, arrows for bidirectional current; black thin strokes on white with a single red element; no text

PV and battery points

Bidirectional metering with reactive energy at the grid-connection point, so import, export and the reactive side are all on the same record.

See the wiring and register maps

Close view of the inside of a wired switchgear door: a 96x96 panel meter sitting in its cutout, an empty DIN-rail slot and two spare wires below it, cabinet hinge at the edge

Quote

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