Overview
The ADL400 is a standard DIN-rail mounted three-phase multifunction energy meter designed for commercial buildings, industrial enterprises, and infrastructure.
Featuring a compact 4-module profile, it integrates powerful functionality within limited distribution panel space.
It not only performs high-precision bi-directional active/reactive energy metering but also monitors all electrical parameters in real-time, with built-in 2nd~31st harmonic analysis.
Supporting RS485 communication with MODBUS protocols and offering 48-month historical data freeze.
It is an ideal choice for Energy Management Systems (EMS), sub-metering projects, and smart distribution systems.
Highlight
High Accuracy
- Class C (0.5s) accuracy
- ±0.2% voltage/current error
- Bidirectional metering
- 2-31st harmonics optional
- Full power parameters
Multi-Tariff & Data
- 8 tariffs, 14 time zones
- 48-month historical data
- 90-day historical data
- Max demand recording
- 4 extreme value records
Fast Communication
- RS485 Modbus/645
- ≤100ms fast refresh (T335)
- 1200-38400 baud rate
- 1-247 Modbus address
- Easy system integration
Compact Design
- 4-module DIN-rail
- 90×72×65mm size
- Direct 10(80)A connection
- CT operated option
- White backlight LCD
Function
| Measurement | Metering | Extended Functions |
| Phase & line voltages (U) | Total combined active/reactive energy | 8 tariffs (peak, flat, off-peak, etc.) |
| Phase currents (I) | Forward/Reverse active energy | 14 time zones / 8 daily schedule tables |
| Per-phase & total active power (P) | Forward/Reverse reactive energy | Last 48 months historical data freeze |
| Per-phase & total reactive power (Q) | Per-phase active energy | Last 90 days historical data freeze |
| Per-phase & total apparent power (S) | 4-quadrant reactive energy | Maximum demand & timestamp |
| Per-phase & total power factor (PF) | — | 4 types of extreme value recording |
| Frequency (F) | — | SOE event logging |
| 2nd~31st harmonic voltage/current | — | Backlight control / Password protection |
| Total Harmonic Distortion (THD) | — | Active/Reactive pulse output |
| — | — | RS485 communication (MODBUS/645) |
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Specification
| Item | Parameter |
| Voltage Ratings | 3×100V, 3×380V (3P3W); 3×57.7/100V, 3×220/380V, 3×230/400V (3P4W) |
| Voltage Range | L-L: 90V~480V; L-N: 50V~277V |
| Current Ratings | Direct connection: 10(80)A; CT operated: 1(6)A, 0.5(80)A |
| Auxiliary Power | Self-powered from measured line, <2W per phase |
| Active Energy Accuracy | Class C (GB/T 17215.321-2021) / Class 0.5s (GB/T 17215.321-2008) |
| Reactive Energy Accuracy | Class 2 |
| Clock Accuracy | ≤0.5s/day |
| Pulse Output | Active optocoupler output; pulse constant: 400 imp/kWh (direct), 10000 imp/kWh (CT) |
| Communication | RS485 with MODBUS-RTU |
| Baud Rate | 1200~38400 bps, programmable |
| Display | 12-digit segment LCD, white backlight, 3-button programming |
| Operating Temperature | -25℃ ~ +55℃ |
| Storage Temperature | -40℃ ~ +70℃ |
| Dimensions | 90mm × 72mm × 65mm (4 modules) |
| Mounting | 35mm standard DIN rail |
| Terminal Torque | Direct connection: 3-4 N·m; CT operated: 0.5 N·m |
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Summary
The ADL400 integrates high-precision metering, harmonic analysis, multi-tariff, and massive historical data storage. It goes beyond traditional metering by offering 2nd~31st harmonic monitoring, demand recording, and 48-month historical data—providing comprehensive support for energy management and cost assessment. With 4-module compact design and standard RS485 dual protocols, it seamlessly integrates with various energy management systems. For digital power distribution projects seeking data depth and system compatibility, ADL400 is a professional and reliable choice.
FAQ
The ADL400 offers two connection methods: Direct connection for circuits up to 80A (e.g., small equipment in-feed); Transformer operated for high-current circuits (e.g., transformer outgoing, large machinery), requiring external CTs. Choose based on actual load current.
Yes. The ADL400 can adapt to both systems by setting the wiring mode parameter (3P4L or 3P3L) in the configuration menu. Please follow the wiring diagrams strictly when connecting voltage and current lines.
You can read per-phase 2nd~31st harmonic voltage/current content and Total Harmonic Distortion (THD) via RS485 communication. The communication address table (Section 10.1) and floating-point data address table (Section 10.2.1) list all harmonic-related registers for easy integration into host systems.
The meter automatically freezes energy data (including TOU) at the end of each month. Users can read these frozen values monthly via communication for annual consumption comparison, performance assessment, or generating monthly energy reports. The freeze time can be set via registers (e.g., 00:00 on the 1st of each month).
The ADL400 supports software correction for current direction. If negative power is displayed, you can use the DIR option in the settings menu (no for forward, yes for reverse) to match the actual wiring, eliminating the need for rewiring and greatly facilitating retrofit projects.
