m. Сміла, Незалежності, 67г. оф, 406/6
GoodWe GW125K-STS-G10 - static transfer switch 137.5 kVA / 125 kW.
Description GoodWe GW125K-STS-G10
GoodWe GW125K-STS-G10 is an industrial-grade static transfer switch: 137.5 kVA apparent power at 125 kW active, for three-phase 230/400 V networks. It is the larger model in the STS range, intended for sites where backup covers not a few critical circuits but the entire operation. Floor-standing design, 21 kg, dimensions 680 × 620 × 165 mm, IP54 protection.
Two power figures — and why both matter
The specification lists 137.5 kVA and 125 kW. That is neither an error nor marketing: the first figure is apparent power, the second active power. The ratio between them gives a power factor of about 0.91.
In practice this means the following. If your load is predominantly resistive — heaters, lighting, heating elements — work to the 125 kW figure. But as soon as electric motors, compressors, welding equipment or transformers appear in the scheme, part of the capacity goes to the reactive component and the calculation must be made in kilovolt-amperes. This is the classic reason a switch specified 'by kilowatts' suddenly fails to carry a real workshop.
What scale of site this suits
A hundred and twenty-five kilowatts is no longer about backing up a single server room or cold store. This rating is enough to sustain:
a mid-sized plant running several machining lines at once;
a shopping centre with full refrigeration, ventilation and lifts;
a hotel or medical facility with kitchen, laundry and climate equipment;
a greenhouse complex with pumps, supplementary lighting and microclimate control.
Transfer speed as the core value
A static switch's advantage over a mechanical one lies in the absence of moving contacts. Transfer is performed by semiconductor devices and therefore happens in a time the equipment does not perceive. For a production site that is the difference between carrying on and halting a process mid-cycle.
The second advantage is service life. A mechanical contactor at these currents has a limited number of operations and its contacts gradually burn. In a static device there is nothing to wear, so scheduled maintenance comes down to checking connections and cleanliness.
Installation specifics
Unlike the smaller model in the series, this switch is designed for floor mounting, and its protection rating is IP54 — protection against dust and splashing, but not against water jets. In plain terms: the device is intended for a plant room or switchgear room, not an open yard in the rain.
It nevertheless weighs only 21 kg and is 165 mm deep — compact equipment for its rating that needs no reinforced base. The manufacturer warranty runs 60 months.
What to account for during design
The switch is specified together with the backup source, not in isolation. There is no point installing a 125 kW device if the storage and inverter can deliver half that — they become the bottleneck. The reverse is equally true: economising with a lower-rated switch turns a powerful storage system into a limited one.
Three values must therefore be aligned in the design: the load rating, the inverter rating and the switch rating.
For a site of this scale we base the calculation on a single-line diagram and a load schedule. Send those over — we will check the power balance and say plainly if the bottleneck turns out to be something other than the switch.
Characteristics GoodWe GW125K-STS-G10
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