Energy Measurement

Three Phase 4P Smart Energy Meter RS485 Modbus Prepaid

Walax three-phase 4P DIN-rail smart energy meter with RS485 Modbus-RTU communication, multi-function measurement and built-in prepaid/fee control. Class 0.5S active energy accuracy for sub-billing and energy management in industrial, commercial and renewable installations.

3P4W Multi-Function

Voltage, current, active/reactive/apparent power, power factor, frequency and harmonic content in one meter for full energy visibility.

RS485 Modbus-RTU

Standard 2-wire RS485 with Modbus-RTU protocol for SCADA, BMS and remote energy-management system integration up to 1000m.

Prepaid / Fee Control

Built-in relay with remote-control and prepaid management, including monthly consumption history and SOE event logging.

Specifications

Technical Specifications

Standard ratings listed below – custom configurations available on request. Contact our engineers to confirm parameters for your market.

Standard	IEC 62053-21 / IEC 62053-22 · CE
Connection type	3P4W (three-phase, four-wire)
Reference voltage (Un)	3× 230V/400V AC (also 3× 127/220V, 3× 57.7/100V)
Operating voltage range	85 – 275V AC (L-N) / 85 – 480V AC (L-L)
Basic / Maximum current	5(80)A / 5(100)A direct connect
Accuracy class	Class 0.5S (active kWh) · Class 2 (reactive kvarh)
Frequency	45 – 65 Hz
Display	LCD with backlight – V / I / P / Q / S / PF / kWh / kvarh / Hz / harmonics
Communication	RS485, Modbus-RTU (1200-9600 bps default 9600)
Pulse output	1× optocoupler, 1000/100/10/1 imp/kWh configurable
Multi-function	Active / reactive / apparent power, PF, THD, last 12 months & 31 days history
Built-in relay	Yes – remote load control and prepaid management
Mounting	35mm DIN rail (TH35-7.5), 7-module width
Ingress protection	IP51 (front) / IP30 (body)
Operating temperature	-25°C to +55°C
Dimensions (W×H×D)	126 × 98 × 80 mm

Applications

Where These Meters Install

Three-phase sub-billing in factories, shopping centres, data centres and apartment blocks. Renewable and PV installations needing bidirectional metering and remote monitoring. Industrial energy-management systems and SCADA integration via Modbus.

FAQ

Frequently Asked Questions

What is the meter's accuracy?

Class 0.5S for active energy and Class 2 for reactive energy, per IEC 62053-21/22 – precision grade suitable for sub-billing and energy management.

What communication does it support?

RS485 with Modbus-RTU at 1200-9600 bps (default 9600). Optional M-Bus or wireless modules are available on request.

Can the meter be used for prepaid billing?

Yes – the built-in relay and 12-month history support remote-control and prepaid/fee-control applications.

What is the maximum current?

Direct-connect versions support 5(80)A and 5(100)A. CT-operated versions are available for higher-current installations.

What is the pulse constant?

1000 / 100 / 10 / 1 imp/kWh (or kvarh), configurable to suit your acquisition system.

Can it record monthly history?

Yes – the meter stores the last 12 months of energy consumption and the last 31 days of daily consumption for billing and load-profile analysis.

What standards does it meet?

IEC 62053-21 / 62053-22 and CE. Country-specific import certifications (SONCAP, PVOC, SABER) on request.

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