DIN Rail Energy Meter
Compact DIN Rail Electric Submeter with Power Quality
- Small Footprint for Machine-level Monitoring, Solar, Wind, and Other Applications with Limited Installation Space
- ANSI C12.20 0.2 Accuracy Class Energy Measurements
- Power Quality Waveform Recording at up to 512 Samples per Cycle
- Extensive Memory for Storing Load Profiles, System Events, Limits, and Alarms
- Modbus, BACnet/IP, or DNP3 for Easy Software Integration
- RS485, 10/100BaseT Ethernet, or BACnet/IP Communication
- Advanced Metering Features: Transformer Line Loss and CT/PT Compensation
- NEW! Supports 0.333 V CTs and Rogowski Coil CTs
DIN Rail Energy Meter
Compact DIN Rail Electric Submeter with Power Quality
- Small Footprint for Machine-level Monitoring, Solar, Wind, and Other Applications with Limited Installation Space
- ANSI C12.20 0.2 Accuracy Class Energy Measurements
- Power Quality Waveform Recording at up to 512 Samples per Cycle
- Extensive Memory for Storing Load Profiles, System Events, Limits, and Alarms
- Modbus, BACnet/IP, or DNP3 for Easy Software Integration
- RS485, 10/100BaseT Ethernet, or BACnet/IP Communication
- Advanced Metering Features: Transformer Line Loss and CT/PT Compensation
- NEW! Supports 0.333 V CTs and Rogowski Coil CTs
Overview
Introducing the ST40 DIN Rail Energy Meter
The ST40 is a compact DIN rail energy meter and power quality meter designed for installations where panel space is limited. It delivers accurate energy measurement and advanced power quality monitoring for machine level monitoring, commercial submetering, renewable energy applications, and industrial equipment. Data integrates with monitoring and energy management platforms, providing greater visibility into energy use and system performance.
Compact DIN Rail Design for Space-Constrained Installations
The ST40’s compact DIN rail design brings advanced metering into electrical installations where available panel space is limited.
- Mounts on a standard top-hat DIN rail, 1.38 inch / 3.50 cm.
- Fits efficiently within electrical and control panels without requiring extensive panel space.
- Well-suited for machine level monitoring, equipment cabinets, switchgear, control panels, and renewable energy installations.
- Provides a practical mounting format for incorporating energy and power quality monitoring close to the equipment or load being measured.
| Measured Parameters | Accuracy% | Display Range |
|---|---|---|
| Voltage L-N | 0.1% | 0-9999 Scalable V or KV |
| Voltage L-L | 0.2% | 0-9999 V or KV Scalable |
| Current | 0.2% | 0-9999 A or KA |
| +/- Watts | 0.2% | 0-9999 Watts, kWatts, MWatts |
| +/-Wh | 0.2% | 5 to 8 Digits Programmable |
| +/-VARs | 0.2% | 0-9999 VARs, KVARs, MVARs |
| +/-VARh | 0.2% | 5 to 8 Digits Programmable |
| VA | 0.2% | 0-9999 VA, KVA, MVA |
| VAh | 0.2% | 5 to 8 Digits Programmable |
| PF | 0.2% | +/- 0.5 to 1.0 |
| Frequency | +/- 0.01 Hz | (45 to 65) Hz |
| THD | +/- 2.0% | 1 to 99.99% |
| Note: Applies to 3 element WYE and 2 element Delta connections. See full accuracy specifications in the ST40 Meter User Manual. Neutral current 2% accuracy. | ||
High-Accuracy Energy Measurement
Accurate energy data is critical for understanding consumption, verifying performance, and supporting billing applications. The ST40 provides precision energy measurement for commercial and industrial systems, with capabilities designed to maintain measurement integrity and support dependable analysis across a range of operating conditions.
- ANSI C12.20 0.2 Accuracy Class energy measurement.
- Traceable watt-hour test pulse for accuracy verification testing.
- Utility block and rolling average demand.
- Transformer Line Loss and CT/PT Compensation.
- Line frequency time sync.
- Sealable voltage and current inputs.
Extensive Data Logging Capability
(V2 and Above)
The ST40 captures and stores detailed electrical data for historical analysis, system evaluation, and troubleshooting. Extensive logging capabilities give engineers greater visibility into operating conditions over time, making it easier to identify trends, investigate events, and evaluate electrical system performance.
- Three independent historical trending logs of 64+ parameters each.
- Anti-tampering system events log records actions in the DIN rail energy meter.
- Power quality log provides timestamped magnitude and duration of up to 2048 events.
- Limit alarms log records out-of-limit events for up to eight programmed limits, including voltage and current unbalance.
| Features | V1 | V2 | V3 | V4 | V5 | V6 |
|---|---|---|---|---|---|---|
| Multifunction Measurement | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Basic Data Logging | ✓ | ✓ | ✓ | |||
| Intermediate Data Logging | ✓ | |||||
| Advanced Data Logging | ✓ | |||||
| Harmonic Analysis | ✓ | ✓ | ✓ | ✓ | ||
| TLC and CT/PT Compensation | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Limit Functions | ✓ | ✓ | ✓ | |||
| 64 Samples per Cycle Waveform Recorder | ✓ | |||||
| 512 Samples per Cycle Waveform Recorder | ✓ |
Upgradable V-Switch™ Technology
V-Switch™ Technology allows the ST40 to grow with changing metering requirements. Capabilities can be upgraded in the field without replacing installed hardware, helping reduce equipment replacement costs and disruption while giving facilities a scalable metering solution that protects their investment over time.
- In-field upgrade of meter features.
- Begin with basic features and add more advanced capability when needed.
Power Quality
Power Quality Measurement
The ST40 provides advanced power quality measurement to help identify electrical disturbances and evaluate system performance, giving engineers actionable data for troubleshooting, equipment monitoring, and maintaining reliable electrical operations.
- Up to 512 samples per cycle waveform recording.
- Pre and post event waveform recording is provided.
- Waveform power quality triggers can be based on a ½ cycle updated RMS.
- Independent CBEMA and SEMI F47 logs are stored for quick power quality analysis.
- Harmonic recording to the 40th order and harmonic analysis to the 255th order.
Communication and System Integration Options
The ST40 supports flexible communication options for bringing energy and power quality data into facility monitoring and energy management systems. Depending on configuration, connectivity supports integration with building and industrial networks, monitoring software, and EIG’s EnergyPQA.com® platform for centralized system visibility.
- RS485 Serial Communication: Provides serial connectivity for integrating the ST40 with compatible monitoring and control systems.
- RJ45 Ethernet: Where configured, Ethernet connectivity supports network based access to meter data and integration with connected systems.
- Modbus Communication: Supports Modbus for exchanging metering data with compatible energy management, automation, and monitoring platforms.
- BACnet/IP: An available BACnet/IP option supports integration with building automation and facility management systems.
- DNP3 Support: Where applicable, DNP3 provides an additional communication option for utility and industrial monitoring environments.
- EnergyPQA.com® Integration: Meter data can be incorporated into EIG’s EnergyPQA.com® platform, helping users monitor and analyze energy and power quality information from a centralized interface.
Specifications
ST40 DIN Rail Energy Meter Specifications
The ST40 combines compact construction with precise metering capabilities for demanding commercial and industrial applications. Review key electrical, mechanical, environmental, and communication specifications to determine how the meter fits specific panel, equipment, and system requirements.
| Specification | ST40 |
| Energy Accuracy | ANSI C12.20 0.2 Accuracy Class |
| Voltage Inputs | Universal voltage inputs |
| Current Inputs | 5 A secondary current inputs |
| Frequency | 45 to 69 Hz |
| Mounting | Standard top hat DIN rail |
| DIN Rail Size | 1.38 in / 3.50 cm |
| Communication | RS485 serial; RJ45 Ethernet where configured |
| Protocols | Modbus, BACnet/IP option, and DNP3 where applicable |
| Power Quality | Harmonics, waveform recording, voltage events, and additional power quality measurements based on V-Switch™ level |
| Data Logging | Onboard logging for energy, electrical measurements, and power quality data |
| System Integration | Compatible with monitoring and energy management systems, including EIG’s EnergyPQA.com® |
Applications
Applications
The ST40 supports energy and power quality monitoring across industrial and commercial environments, including machine level applications, equipment panels, submetering, renewable energy systems, and facility energy management.
- Machine level monitoring.
- Power quality metering.
- Commercial submetering.
- Cost allocation and sub-billing.
- Medical and industrial equipment monitoring.
- Solar, wind, and micro-turbine power generation metering.
- Applications where installation space is limited.
When Should You Use a DIN Rail Energy Meter?
Use a DIN rail energy meter when metering must fit inside an existing electrical or control panel, particularly where space is limited. It is also suited for machine level monitoring, submetering, renewable generation, and connected energy management applications. The ST40 goes further by combining accurate energy measurement, extensive data logging, power quality functionality, and flexible communication options in one compact meter.
FAQs
Can the ST40 be installed in an existing electrical panel?
Yes. The ST40’s compact DIN rail design makes it suitable for installation within existing electrical and control panels where compatible DIN rail mounting and adequate space are available. Installation should follow applicable electrical requirements and EIG documentation.
What current transformers can be used with the ST40?
The ST40 supports current transformer inputs for measuring electrical loads. CT selection depends on the system configuration, primary current range, and application requirements. Refer to EIG’s ST40 specifications and installation documentation when selecting compatible CTs for a specific installation.
Can the ST40 communicate with a building or energy management system?
Yes. The ST40 offers communication capabilities including RS485 and, depending on configuration, Ethernet connectivity. Supported protocols such as Modbus and optional BACnet/IP allow meter data to be incorporated into compatible building automation, energy management, and monitoring platforms.
Can ST40 features be upgraded after installation?
Yes. EIG’s V-Switch™ Technology allows ST40 capabilities to be upgraded in the field as monitoring requirements change. This provides a path to additional functionality without replacing the installed meter, helping facilities adapt their metering capabilities over time.
Does the ST40 require a separate display?
No. The ST40 includes an integrated display for viewing meter information directly at the installation. For broader analysis and remote visibility, measurement data can also be accessed through compatible communications and monitoring software, depending on the meter’s configured options.
What documentation is available for specifying or installing the ST40?
EIG provides technical resources for the ST40, including product specifications, brochures, installation and operation documentation, and communication information. These materials provide engineers and installers with details needed for meter selection, system design, configuration, and proper installation.
Downloads
Downloads
Engineers and specifiers can access ST40 product specifications, dimensions, installation documentation, wiring information, and ordering details to support system design and project planning.
Tech Documents
Generic Specifications
Ordering Guide
Youtube Videos