In three phase voltage networks with isolated neutral point which use single-pole voltage transformers, ferro-resonance may occur. These resonances are generated by the concur of single-pole voltage transformers non-linear inductance of open-circuit operation and the earthing capacitance of the network.

| Isolation level | Nominal three phase current of voltage transformer | PR total 100V | PD total | Article number |
|---|---|---|---|---|
| 0,72kV | 10A | 295W | 1200VA | BE10 |
| 0,72kV | 15A | 295W | 1200VA | BE15 |
| 0,72kV | 2A | 147W | 800VA | BE2 |
| 0,72kV | 4A | 147W | 800VA | BE4 |
| 0,72kV | 6A | 147W | 800VA | BE6 |
| 0,72kV | 9A | 295W | 800VA | BE9 |
This product is designed to be safe under the following conditions:


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