STM7E-250 ZB Multi-Function Changeover Switch
STM7E-250 ZB multi-function changeover switch for three-phase unbalance correction: 125A to 250A, metering, remote control and early-warning functions.
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STM7E-250 ZB multi-function changeover switch for three-phase unbalance correction: 125A to 250A, metering, remote control and early-warning functions.
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
Phase-Changeover Switch STM7E-250ZB
| Parameter | 250ZB |
|---|---|
| Number of poles | Four-phase to two-phase |
| Rated current (A) | 250A(100A~250A) |
| 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*124 |
| 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 |
| Energy metering | Included |
| Carrier communication | Included |
| Remote control | Included |
Typical Applications
- LV distribution networks
- Rural electrification
- Grid quality improvement
Frequently Asked Questions
What functions are included in the ZB version?
The listed ZB functions include automatic three-phase unbalance correction, remote control, early warning and energy metering.
What electrical performance is listed?
The family covers 125A, 160A and 250A versions, with Icu/Ics of 20/10kA, 8 to 10ms switching and at least 50,000 operating cycles.
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