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Archmeter PA30 Compact Smart Meter
PA30 Series Compact Smart Meter
The Archmeter PA30 Series is a compact rail-mounted smart meter range designed for general single-phase and poly-phase power measurement. It is suitable for low-voltage primary-side metering and medium / high-voltage secondary-side metering when used with the correct CT and wiring arrangement.
The PA30 Series includes the PA34 for 1-phase 4-channel monitoring and the PA33 for three-phase power monitoring. With clip-on CTs, RS485 Modbus communication, compact size, low auxiliary power requirement and kWh accuracy better than 0.5% at PF = 1, the PA30 is suitable for retrofit metering, feeder monitoring, panel monitoring and energy management applications.
Meter Series PA30 Compact Smart Meter
Models PA34: 1-phase 4-channel / PA33: 3-phase
CT Options Ø10 mm 60A, Ø16 mm 100A, Ø24 mm 200A
Communication RS485 Modbus, optional LonTalk
Product Description
The PA30 Series is designed for compact power and energy measurement in existing or new electrical panels. Its clip-on CT design makes installation easier for retrofit applications because the CTs can be installed around existing conductors with reduced wiring effort.
The PA34 model is designed for 1-phase 4-channel monitoring, making it useful for multiple single-phase circuits. The PA33 model is designed for three-phase applications and supports multiple wiring modes, including 1P2W, 1P3W, 3P3W and 3P4W configurations.
Best use case: PA30 is suitable where compact DIN rail metering is required with clip-on CTs, RS485 Modbus communication and multiple circuit / phase measurement from a small device.
Key Features
Compact Rail-Mounted Design
Small 78 mm × 35 mm × 99 mm body size suitable for crowded electrical panels and retrofit metering cabinets.
Clip-On CT Installation
Clip-on CTs make wiring simpler and help reduce installation work in existing panels.
Wide CT Range
Supports CT Ø10 mm 60A, CT Ø16 mm 100A and CT Ø24 mm 200A measurement options.
True RMS Measurement
Measures True RMS power and energy parameters in a compact smart meter format.
kWh Accuracy Better Than 0.5%
Provides kWh accuracy of 0.5% at PF = 1, better than IEC 62053-21 requirements.
RS485 Modbus Communication
Built-in half-duplex isolated RS485 communication supports Modbus protocol for integration with gateways and monitoring systems.
Optional LonTalk Port
Optional LonTalk secondary communication port is available for projects requiring LonWorks-type integration.
Low DC Auxiliary Power
Operates with DC 10–30V auxiliary power, useful for compact metering panels and gateway systems.
Single-Phase or Three-Phase Use
PA34 supports 1-phase 4-channel monitoring, while PA33 supports three-phase wiring configurations.
PA33 and PA34 Model Selection
| Model |
Application |
Input Voltage |
Wiring / Channel Configuration |
Recommended Use |
| PA34 |
1-phase 4-channel compact smart meter |
10–300V |
1-phase 4-channel |
Multiple single-phase loads, tenant circuits, lighting circuits, small power circuits and distributed sub-metering. |
| PA33 |
Three-phase compact smart meter |
10–500V |
Auto or manual setting: 1P2W-1CT, 1P3W-2CT, 3P3W-2CT, 3P3W-3CT and 3P4W. |
Three-phase feeders, motors, pumps, HVAC panels, distribution boards and energy monitoring applications. |
Selection note: Use PA34 when the requirement is to monitor up to four single-phase circuits. Use PA33 when the requirement is to monitor a three-phase feeder or a poly-phase electrical system.
Ordering Code Structure
The PA30 ordering code is based on the meter model, CT size and secondary communication port option.
| Ordering Code Field |
Available Option |
Description |
| Model |
4 |
PA34: 1-phase 4-channel model. |
| Model |
3 |
PA33: 3-phase model. |
| CT Size |
0 |
CT Ø10 mm, standard, 60A. |
| CT Size |
1 |
CT Ø16 mm, optional, 100A. |
| CT Size |
2 |
CT Ø24 mm, optional, 200A. |
| Secondary Communication Port |
0 |
No secondary communication port. |
| Secondary Communication Port |
1 |
LonTalk secondary communication port option. |
Ordering example: PA3x ---- x x structure means the final selection must confirm the model type, CT size and secondary communication-port option before ordering.
Size and Latch
The PA30 Series has a compact rail-mounted enclosure, making it suitable for installation inside distribution boards, control panels, metering panels and IoT gateway panels.
PA30 Size and Latch
Technical Specification
| Item |
Specification |
| Input Voltage |
PA34: 10–300V. PA33: 10–500V. |
| Input Current |
Clip-on CT Ø10 mm 60A, CT Ø16 mm 100A and CT Ø24 mm 200A. |
| Auxiliary Power |
DC 10–30V. |
| Frequency |
50 / 60 Hz. |
| Starting Current |
< 0.001 Ib. |
| Wiring Diagram |
PA34: 1-phase 4-channel. PA33: auto or manual setting for 1P2W-1CT, 1P3W-2CT, 3P3W-2CT, 3P3W-3CT and 3P4W. |
| Communication |
RS485, half-duplex isolated. Baud rate: 9600, 19200 default and 38400. Protocol: Modbus. LonTalk optional. |
| kWh Accuracy |
0.5% at PF = 1, better than IEC 62053-21. |
| Size |
78 mm (L) × 35 mm (W) × 99 mm (H). |
| Operating Temperature |
-10°C to 60°C. |
| Installation |
Rail-mounted. |
Measured Parameters
| Model |
Measured Parameters |
| PA34 |
V1, V2, I1, I2, I3, I4, kW1–kW4, kVA1–kVA4, kvar1–kvar4, PF1–PF4, kWh1–kWh4, kVAh1–kVAh4 and kvarh1–kvarh4. |
| PA33 |
VA, VB, VC, Vave, IA, IB, IC, Iave, kWA, kWB, kWC, kWtot, kVAA, kVAB, kVAC, kVAtot, kvarA, kvarB, kvarC, kvartot, PFA, PFB, PFC, PFtot, kWhA, kWhB, kWhC, kWhtot, kVAhA, kVAhB, kVAhC, kVAhtot, kvarhA, kvarhB, kvarhC and kvarhtot. |
Certification and Compliance
The PA30 datasheet lists LVD, CE and FCC test compliance. This supports use in industrial and commercial environments where EMC and safety compliance are required.
| Test / Standard |
Listed Compliance |
| LVD Test |
EN 61010-1. |
| CE Conducted / Radiated Emission |
EN 61326 conducted emission and EN 61326 radiated emission. |
| CE Immunity / EMC Tests |
EN 61000-3-2, EN 61000-3-3, EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6, EN 61000-4-8 and EN 61000-4-11. |
| FCC Test |
Class A and CISPR 22. |
Typical Applications
Retrofit Sub-Metering
Clip-on CTs make the PA30 suitable for adding metering to existing panels and feeders.
Single-Phase Circuit Monitoring
PA34 can monitor multiple single-phase channels from one compact meter.
Three-Phase Feeder Monitoring
PA33 supports three-phase feeder monitoring with flexible wiring modes.
Tenant and Floor Metering
Use PA30 for energy allocation by tenant, floor, area or department.
Equipment-Level Energy Monitoring
Monitor HVAC, pumps, lighting panels, small power circuits and production loads.
EMS / BMS / SCADA Integration
RS485 Modbus allows integration with monitoring systems, gateways and IoTWatt 4.0.
Typical System Integration
PA30 meters can be installed inside metering panels or distribution boards. Measurement data can be collected through RS485 Modbus and connected to a gateway, BMS, EMS, SCADA or IoTWatt 4.0 for centralised monitoring and reporting.
Integration with IoTWatt 4.0
When connected to IoTWatt 4.0, PA30 meter data can be used for energy dashboards, circuit comparison, tenant metering, feeder-level analytics, digital energy audit, EECA reporting support and abnormal energy consumption detection.
- Monitor single-phase or three-phase energy values through RS485 Modbus.
- Use PA34 for multiple single-phase circuit monitoring.
- Use PA33 for three-phase feeder and equipment monitoring.
- Collect kWh, kW, kVA, kvar, PF and related measured values for dashboards and reports.
- Use circuit-level data for baseline creation, load profiling and energy audit evidence.
- Connect through RS485 using a suitable gateway such as RS2LAN, RS2MQTT or RS2WLAN.
Integration note: PA30 is a practical compact smart meter for IoTWatt 4.0 projects where retrofit-friendly CT installation and Modbus data collection are required.
Recommended Deployment Checklist
- Confirm model selection: PA34 for 1-phase 4-channel or PA33 for three-phase monitoring.
- Confirm CT size: Ø10 mm 60A, Ø16 mm 100A or Ø24 mm 200A.
- Confirm whether optional LonTalk secondary communication port is required.
- Confirm auxiliary power availability: DC 10–30V.
- Confirm wiring mode and phase configuration.
- Confirm RS485 address, baud rate, parity, shielding and termination.
- Confirm panel rail space and CT installation clearance.
- Confirm EMS, BMS, SCADA, gateway or IoTWatt 4.0 integration requirement.
- Test CT direction, voltage reference, phase mapping and Modbus communication during commissioning.
PA30 Smart Meter Supply, Commissioning and IoTWatt 4.0 Integration
Saturn Pyro supports Archmeter PA30 Compact Smart Meters for retrofit sub-metering, PA33 three-phase metering, PA34 single-phase 4-channel metering, RS485 Modbus integration, EMS / BMS / SCADA connectivity and IoTWatt 4.0 digital energy audit projects in Malaysia.
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