STM7E-125 Three-Phase Unbalance Changeover Switch
STM7E-125 intelligent changeover switch for correcting three-phase unbalance in AC400V/AC220V networks, with 125A to 250A model ratings and 8–10ms switching.
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STM7E-125 intelligent changeover switch for correcting three-phase unbalance in AC400V/AC220V networks, with 125A to 250A model ratings and 8–10ms switching.
Overview
The STM7E series solves three-phase unbalance in LV networks: intelligent changeover switches that redistribute single-phase loads and provide multi-function switching.
Key Features
- Automatic three-phase unbalance correction
- Multi-function changeover (ZB models)
- Reduces neutral current and transformer losses
- Utility-grade durability
Three-Phase Unbalanced Phase-Change Switch STM7E-125
| Parameter | 125 |
|---|---|
| Number of poles | Four-phase to two-phase |
| Rated current (A) | 125A(50A~125A) |
| Rated voltage (V) | AC400V/220V |
| Rated impulse withstand voltage Uimp (kV) | 8kV |
| Rated insulation voltage (V) | AC1000V |
| Rated short-time withstand Icw | 3kA/0.3s |
| Short-circuit breaking capacity Icu/Ics (kA) | 20kA/10kA |
| Operating cycles | >= 50,000 operations |
| Overall dimensions (mm) b-a-ca | 190*140*110 |
| Residual-current operating characteristic | Type AC |
| Automatic reclosing time (s) | 20s ~ 60s |
| Phase-change time | 8~10ms |
| Automatic trip device | Electronic permanent-magnet type |
| Overcurrent characteristic | 1.05In: no trip within 2 h; 1.30In: trip within 2 h |
Typical Applications
- LV distribution networks
- Rural electrification
- Grid quality improvement
Frequently Asked Questions
Which current ratings are covered by STM7E?
The listed versions are 125A with a 50A to 125A range, 160A with a 63A to 160A range, and 250A with a 100A to 250A range.
How quickly does the switch change phases?
The product data lists an 8 to 10ms switching time, 20 to 60 second leakage auto-reclosing and a 3kA short-time withstand rating for 0.3 seconds.
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