Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1408-EM3A-ENT |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Type | Energy Monitor (EM3 Series) |
| Series | PowerMonitor 1000 |
| Control Power | 85…264V AC, 47…63 Hz (2.5 VA max) or 125…250V DC (4 VA max) |
| Voltage Sense Inputs | V1, V2, V3; Input Impedance: 5 MΩ min; Input Current: 2 mA max |
| Current Sense Inputs | I1, I2, I3; 5A RMS nominal; Overload: 15A continuous, 200A for 0.5s |
| Communication Protocols | EtherNet/IP, Modbus TCP, DF1 Full/Half-Duplex, Modbus RTU, DH-485 |
| Ethernet Port | Integrated, ODVA EtherNet/IP Conformance Tested (Version A2.8) |
| Serial Port | RS-485 |
| Display | Integrated LCD |
| Status Inputs | Two, contact closure (internal 24V DC) |
| KYZ Output | Configurable; 30 mA at 240V AC / 300V DC |
| Operating Temperature | -10…60 °C (14…140 °F) |
| Storage Temperature | -40…85 °C (-40…185 °F) |
| Humidity | 5…95%, non-condensing |
| Mounting | Panel or DIN Rail |
| Certifications | UL, cUL, CE; EN62053-21:2003 Class 1 accuracy |
Main Features and Advantages
Complete Energy Monitoring Capability: The Allen-Bradley 1408-EM3A-ENT combines all measurement functions of the PowerMonitor 1000 product family, delivering voltage, current, frequency, power (kW/kVAR/kVA), true power factor, energy (kWh/kVARh/kVAh), and demand analysis (actual, projected, and power factor) in a single device . This comprehensive parameter set eliminates the need for multiple monitoring instruments, reducing installation cost and panel space requirements.
Revenue-Grade Accuracy: With metering accuracy classified under EN62053-21:2003 for power functions and Class 1 requirements for energy functions, the 1408-EM3A-ENT provides the precision necessary for billing and sub-billing applications . Voltage and current sensing inputs maintain ±0.5% accuracy at 25°C, ensuring reliable data for cost allocation and energy management decisions.
Dual Communication Flexibility: The Allen-Bradley 1408-EM3A-ENT supports both Ethernet (EtherNet/IP, Modbus TCP) and serial (RS-485: DF1 Full/Half-Duplex, Modbus RTU, DH-485) communications . This dual-protocol capability enables integration with existing control systems, SCADA platforms, and energy management software without requiring additional gateway hardware.
Comprehensive Logging and Diagnostics: The 1408-EM3A-ENT maintains energy logs, minimum/maximum logs, load factor logs, and status logs for historical analysis and troubleshooting . Wiring diagnostics provide verification of proper installation, while Time of Use (TOU) logging supports on-peak and off-peak energy analysis for demand response strategies.
Integrated Display and Local Configuration: An onboard LCD display allows technicians to view real-time data and configure parameters without external software, simplifying commissioning and maintenance . Panel or DIN rail mounting options accommodate diverse installation requirements in electrical enclosures and control panels.
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