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The two models are physically installation-compatible, but there are critical differences in power supply type and functional configuration. Adjustments shall be made according to system requirements: confirm the voltage range for the self-powered design; communication functions are fully compatible; display performance and measurement accuracy are upgraded. The main limitation is no auxiliary power supply support.
- In-depth Model Segment Definition Comparison
| Model | Segment | Meaning | Key Difference |
| WM12-96.AV5.3.3.S | WM12-96 | 96×96mm panel-mounted three-phase indicator with built-in keypad | Old series, LED display, auxiliary power supply design |
| AV5 | Measuring range: 380/660V L-L / 5(6)A AC | Same measuring range | |
| 3 | 3-phase system for unbalanced load | Same system type | |
| 3 | 18–60VDC auxiliary power supply | DC auxiliary power supply | |
| S | With RS485 communication | Same communication function | |
| WM1596AV53XoSX | WM1596 | 96×96mm panel-mounted three-phase power analyzer | New series, LCD display, self-powered design |
| AV5 | Measuring range: 380/660V L-L / 5(6)A AC | Same measuring range | |
| 3 | 3-phase system for unbalanced load | Same system type | |
| Xo | Self-powered (no auxiliary power required) | No external power supply needed | |
| S | With RS485 communication | Same communication function | |
| X | No pulse / alarm output | No additional output functions |
- Core Parameter Compatibility Comparison
| Parameter Category | WM12-96AV5.3.3.S | WM1596AV53XoSX | Compatibility | Remarks |
| Physical Installation | 96×96mm panel, cutout 92×92mm | 96×96mm panel, cutout 92×92mm | ✅ Fully Compatible | Direct interchangeable installation, no panel modification required |
| Display Type | 3×3-digit LED, 14mm digit height | Graphic LCD with higher readability | ✅ Function Upgrade | Richer display content, supports Chinese interface |
| Measurement Accuracy | Voltage/Current: ±0.5% FS | Voltage/Current: ±0.5% RDG | ✅ Accuracy Improved | Meets higher metering requirements |
| Power: ±(1% FS + 1 Digit) | Active Energy: Class 1 | |||
| Power Supply Type | 18–60VDC auxiliary power | Self-powered (120–240V L-N / 208–415V L-L) | ❌ Incompatible | No external power needed, but system voltage must be within the range |
| Communication | RS485, Modbus RTU, 9600bps | RS485, Modbus RTU, 9600/19200bps | ✅ Compatible | Communication parameters configurable for matching |
| Measurement Functions | Basic electrical parameters, maximum value indication | Basic parameters + Voltage/Current THD, bi-directional energy measurement | ✅ Function Expanded | Added harmonic analysis for comprehensive monitoring |
| Ingress Protection | Front IP65, Terminal IP20 | Front IP51, Terminal IP20 | ⚠️ Slightly Reduced | No impact for indoor use; extra protection required for outdoor/dusty environments |
| Operating Temperature | -10°C ~ +50°C | -10°C ~ +50°C | ✅ Fully Compatible | Consistent environmental adaptability |
- Replacement Feasibility Matrix
3.1 ✅ Direct Replacement Applicable Scenarios
System voltage matches the self-powered range (120–240V L-N / 208–415V L-L) and no external auxiliary power is required
Harmonic analysis or advanced energy metering functions are needed
Higher display readability is preferred (LCD instead of LED)
New project design where full advantages of WM15 series functions can be utilized
3.2 ⚠️ Replacement After Necessary Adjustments
| System Condition | Adjustment Measure | Notes |
| Original system equipped with 18–60VDC auxiliary power | Keep the power supply wired but unconnected, or remove it to save cost | WM15 self-powered version requires no external auxiliary power |
| System voltage exceeds self-powered range | Select WM15 version with auxiliary power (e.g. WM1596AV53AoSX) | Auxiliary power model supports 208–600V L-L |
| Pulse / alarm output is required | Replace with output-equipped model (e.g. WM1596AV53XoSO) | “O” = 1 relay output; “SO” = 2 relay outputs |
3.3 ❌ Non-Replaceable Scenarios
| Restriction Description |
| System voltage lower than 120V L-N with no available auxiliary power supply |
| DC auxiliary power supply is mandatory (e.g. safety standard requirements) |
| Front panel IP65 protection rating is compulsory (e.g. outdoor or heavy dust environments) |
| Budget limited and only basic display functions required (WM15 is higher in price than WM12) |
- Replacement Implementation Guidelines
4.1 Hardware Installation Steps
- Power off the system, remove the original WM12 unit, keep CT and voltage wiring intact.
- Install WM1596AV53XoSX directly into the existing 96×96mm panel cutout.
- Connect CT (current) and voltage input wires according to the same terminal definition.
- Do not connect the original DC auxiliary power supply (WM15 is self-powered).
- Wire RS485 communication cable if remote monitoring is required.
4.2 Key Configuration Settings
| Configuration Item | Setting Path | Recommended Value |
| Communication Parameters | Menu → SETTINGS → COMMUNICATION | Address: 1–247, Baud rate: 9600bps, 8N1 |
| System Type | Menu → SETTINGS → SYSTEM → WIRING | 3P4W (3-phase 4-wire) or 3P3W (3-phase 3-wire) |
| Display Mode | Menu → SETTINGS → DISPLAY | Cyclic display of voltage, current, power, frequency |
| Harmonic Measurement | Menu → SETTINGS → MEASUREMENT → THD | Enable (default activated) |
4.3 Official Replacement Recommendation
Carlo Gavazzi officially defines the WM15 series as the final replacement for the WM12 series, featuring:
Higher measurement accuracy (Class 1 active energy)
Enhanced functions: harmonic analysis, bi-directional energy metering
Longer product lifecycle and technical support
Compatible with UCS configuration software for batch parameter setup
- Replacement Decision Guide
- Is system voltage within 120–240V L-N / 208–415V L-L?
Yes: WM1596AV53XoSX can be used directly
No: Choose WM15 model with auxiliary power (e.g. WM1596AV53AoSX)
- Is RS485 communication required?
Yes: Select model with suffix S
No: Select model without S (e.g. WM1596AV53XoXX)
- Is pulse / alarm output required?
Yes: Select model with suffix O (e.g. WM1596AV53XoSO)
No: Keep the original selected model
