Device Comparison
IAMMETER WEM3080T vs Shelly Pro 3EM 120A vs ABB B23 112-100
A three-way comparison for three-phase monitoring, local data access, and installer-led metering.
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Which To Choose
Start with the practical fit, then read the table.
IAMMETER WEM3080T
Best fit when single-phase, split-phase, and 3-phase 4-wire WYE/Star systems; use WEM3080TD for 3-phase 3-wire Delta systems, solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro 3EM 120A
Best fit when single-phase or three-phase AC measurement., solar import/export visibility, and local dashboards and Home Assistant.
ABB B23 112-100
Best fit when three-phase 3-wire and 4-wire systems; nominal 3 x 230/400 V AC., local dashboards and Home Assistant, and indoor 4-DIN DIN-rail direct-connected three-phase energy meter for distribution boards and small enclosures..
Use this comparison when the home or small site needs three-phase visibility and the decision is between app-friendly Wi-Fi, local automation, and classic Modbus metering.
At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
IAMMETER WEM3080T
- Phase
- Single-phase, split-phase, and 3-phase 4-wire WYE/Star systems; use WEM3080TD for 3-phase 3-wire Delta systems
- Installation
- 2P DIN-rail mounted Wi-Fi energy meter with optional 3 x 150A, 250A, or 500A split-core CTs and an external antenna
- Measurement
- Bidirectional three-phase or split-phase Wi-Fi energy meter with active/reactive energy, power factor, and NEM-ready import/export monitoring
- Max current
- 500 A
Shelly Pro 3EM 120A
- Phase
- Single-phase or three-phase AC measurement.
- Installation
- DIN-rail mounted meter with external 120 A current transformers.
- Measurement
- CT-based single-/three-phase energy meter with 4-quadrant import/export measurement.
- Max current
- 120 A
ABB B23 112-100
- Phase
- Three-phase 3-wire and 4-wire systems; nominal 3 x 230/400 V AC.
- Installation
- Indoor 4-DIN DIN-rail direct-connected three-phase energy meter for distribution boards and small enclosures.
- Measurement
- Direct-connected three-phase active-energy meter with RS485 Modbus RTU / EQ Bus and pulse or alarm output.
- Max current
- 65 A
Before You Decide
Checks that matter before price.
- Confirm your supply type first: single-phase, split-phase, or three-phase.
- Decide whether DIN-rail wiring, CT clamps, or utility-meter access fits your switchboard.
- Choose between cloud convenience and local data access before comparing prices.
- For solar homes, make sure import, export, and load readings are measured at the right point.
| Install fit | |||
|---|---|---|---|
| Phase support | Single-phase, split-phase, and 3-phase 4-wire WYE/Star systems; use WEM3080TD for 3-phase 3-wire Delta systems | Single-phase or three-phase AC measurement. | Three-phase 3-wire and 4-wire systems; nominal 3 x 230/400 V AC. |
| Installation | 2P DIN-rail mounted Wi-Fi energy meter with optional 3 x 150A, 250A, or 500A split-core CTs and an external antenna | DIN-rail mounted meter with external 120 A current transformers. | Indoor 4-DIN DIN-rail direct-connected three-phase energy meter for distribution boards and small enclosures. |
| Measurement | Bidirectional three-phase or split-phase Wi-Fi energy meter with active/reactive energy, power factor, and NEM-ready import/export monitoring | CT-based single-/three-phase energy meter with 4-quadrant import/export measurement. | Direct-connected three-phase active-energy meter with RS485 Modbus RTU / EQ Bus and pulse or alarm output. |
| Max current | 500 A | 120 A | 65 A |
| Nominal voltage | 80-277 VAC (phase) / 140-480 VAC (line) | Unknown | Unknown |
| Meter fit | |||
| Accuracy class | Class 1 energy (IEC 62053-21); ±1% voltage/current/power | Class B active energy / 1% measurement accuracy | Active energy Class B (Class 1). |
| Current sensing | 3 x split-core CTs; WEM3080T variants are sold with 150 A, 250 A, or 500 A CT options depending on package. | 3 x 120 A current transformers for single- or three-phase measurement. | Direct connection up to 65 A; no external CTs for B23 112-100. |
| Monitoring | |||
| Protocol | Wi-Fi / HTTP / HTTPS / MQTT / Modbus TCP / Local API | LAN / Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / TLS | Modbus RTU |
| Local API | Yes | Yes | Yes |
| Cloud dependency | Optional cloud; IAMMETER-Cloud Pro is included with WEM3080T, while local API, MQTT, Modbus/TCP, and self-hosted workflows remain available. | Optional Shelly Cloud; local LAN operation is available through embedded web interface, Modbus TCP, MQTT, HTTP/RPC, WebSocket, scripting, and webhooks. | No ABB cloud required for core metering; B23 112-100 exposes local RS485 Modbus RTU / EQ Bus data when connected to compatible equipment. |
| Home Assistant | Yes | Yes | Yes |
| Solar fit | |||
| Solar import/export | Yes | Yes | No |
| Buying context | |||
| Price range | About USD 168-280 depending on CT variant | About USD 154.99 | About $150-$300 |
| Availability | Global | United States / Europe / regional Shelly official stores and distributors; exact 120A bundle availability varies by market. | ABB global product and distributor channels; MID/IEC availability and local stock vary by country. |
| Source check | |||
| Last verified | Jun 3, 2026 | Jun 18, 2026 | Jun 25, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs |
Verdict
IAMMETER WEM3080T is the strongest fit when solar monitoring and cloud-or-local flexibility matter. Shelly Pro 3EM 120A is best for Shelly automation and LAN-first installs. ABB B23 fits electrician-led Modbus jobs where a traditional meter is preferred.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 3 energy meter options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Can these devices work with local dashboards or Home Assistant?
IAMMETER WEM3080T, Shelly Pro 3EM 120A, ABB B23 112-100 list Home Assistant support in the catalog. IAMMETER WEM3080T, Shelly Pro 3EM 120A, ABB B23 112-100 are marked with local API support. Confirm firmware, region, and integration maturity before treating this as a final compatibility guarantee.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.