The Siemens LW39-25 EN60947-5-1 universal transfer switch user manual provides safety guidelines, technical specifications, wiring diagrams, and…
The LW39-25 series universal transfer switch is designed for various control circuits, electrical measurement instrument switching, and remote control of distribution equipment. It can also be used for low‑capacity motor start/stop, forward‑reverse conversion, and two‑speed motor speed control.
The manual covers safety precautions, technical parameters, operating environment limits, wiring terminal capacities, lamp‑box schematics, and detailed installation dimensions. It includes recommended fuse types, torque values for terminal screws, and environmental specifications such as temperature and humidity ranges. This manual is written in Chinese.
| Rated insulation voltage (Ui) | 690 V |
|---|---|
| Rated heating current (Ith) | 25 A |
| Power frequency withstand voltage | 1890 V / 5 s |
| Mechanical life | 300 000 cycles |
| Electrical life (AC) | 200 000 cycles |
| Electrical life (DC) | 100 000 cycles |
| Recommended fuse rating | NT00-25A |
| Maximum conductor cross‑section per terminal | 4 mm² (up to 2 conductors) |
| Minimum conductor cross‑section per terminal | 1 mm² (up to 2 conductors) |
| Screw tightening torque | 1.2 N·m |
| Operating temperature range | -25 °C ~ +55 °C |
| Maximum relative humidity | ≤ 90 % |
| Maximum installation altitude | ≤ 2000 m |
| Pollution degree | 3 |
The rated insulation voltage (Ui) is 690 V.
The manual recommends using a fuse with the model NT00‑25A.