The ADF400L is a multi-user energy meter designed for centralized monitoring of multiple energy users in a single system. Through a modular structure, it supports up to 36 single-phase or 12 three-phase measurement points. It offers both direct access and CT-based transformer access, enabling hybrid deployment. Ideal for multi-tenant or sub-metering scenarios in residential complexes, universities, factories, or commercial buildings, the ADF400L enables high-accuracy real-time metering, communication over RS485 and Ethernet, and remote control capabilities. With optional prepaid features, it supports IC card swiping, cost control, and tamper-proof energy management.

Technical Specifications

Feature	Specification
Model	ADF400L
Voltage Input	3×220/380V or 3×57.7/100V
Current Input (Direct)	3×10(80)A (up to 36 single-phase)
Current Input (CT)	3×1(6)A via CT (up to 12 three-phase)
Accuracy Class	Active energy: Class 0.5s
Starting Current	0.001 Ib
Display	8-digit LCD, programmable with backlight
Communication Interfaces	RS485 (Modbus-RTU), Infrared, Ethernet (optional)
Pulse Output	1–2 per module, 80ms±20ms pulse width
Digital Inputs	Up to 4DI (wet contact, 220V on transformer modules)
Digital Outputs	Up to 4DO (relay output, dry contact)
Prepayment Features	IC card recharge, cost/time/strong/negative control
Time-of-Use Settings	4 tariffs, 2 schedules, 14 daily time slots
Harmonic Analysis	Up to 31st order (voltage & current)
Power Supply	AC/DC 85–265V or 3×220/380V AC
Operating Temperature	-20°C to +60°C
Storage Temperature	-30°C to +70°C
Humidity	≤93% RH, non-condensing
Altitude	≤2500m
Mounting	35mm DIN rail for modules; modular multi-row configuration

Functions

• Multi-loop energy monitoring: supports 36 single-phase or 12 three-phase connections
• Measurement of voltage, current, active/reactive/apparent power, power factor, frequency
• Bidirectional energy tracking with forward and reverse separation
• Time-sharing energy statistics for tariff billing
• Harmonic detection and power quality assessment
• LCD screen with button programming for local setup
• RS485, infrared, and optional Ethernet communication for remote reading
• Optional prepaid IC card system with cost and load control
• Supports DI/DO for alarms, load control, or event triggers

Applications

• Apartment complexes and dormitories
• Schools and university campuses
• Commercial and office buildings with sub-metering
• Industrial parks and factory units
• Public sector and government utilities
• EV charging systems requiring multi-point monitoring

Manufacturer Information

Acrel Co., Ltd., established in 2003, is a high-tech enterprise specializing in energy efficiency management and electrical safety solutions. With a comprehensive product line ranging from cloud platform software to sensors, Acrel offers smart energy meters, power sensors, and protection devices. Their products are widely utilized across industries such as electric power, communications, rail transit, petrochemical, and construction. In 2012, Acrel was listed on the Growth Enterprise Market with the stock code 300286.SZ. The company is committed to delivering innovative and reliable energy management solutions to its global clientele.