UNISUN ELECTRICTel / WhatsApp: +86 158 8822 9669
UNISUN ELECTRICMedium-voltage vacuum circuit breakers for indoor air-insulated switchboards. Solid-insulated embedded poles, EL stored-energy operating mechanism, maintenance-free interrupters. Rated up to 4000 A / 63 kA.
Four standard models cover 12 kV to 40.5 kV. Both fixed and withdrawable (handcart) versions available — designed for KYN28 and similar switchgear.
Full range of UNVS1 medium-voltage vacuum circuit breakers. Test voltage per DIN VDE 0670 part 1000. Other values on request.
| Rated voltage | 12 kV | 24 kV | 36 kV | 40.5 kV |
|---|---|---|---|---|
| Rated frequency | 50 / 60 Hz | 50 / 60 Hz | 50 / 60 Hz | 50 / 60 Hz |
| Rated normal current | 630 – 4000 A* | 630 – 2500 A | 630 – 3150 A* | 630 – 3150 A* |
| Rated short-circuit breaking current (symm.) | 16 / 20 / 25 / 31.5 / 40 / 50 / 63 kA | 16 / 20 / 25 kA | 16 / 20 / 25 / 31.5 / 40 kA | 16 / 20 / 25 / 31.5 / 40 kA |
| Rated short-circuit making current | 40 – 158 kA | 40 / 80 kA | 40 – 100 kA | 40 – 100 kA |
| Rated duration of short-circuit | 3 s | 3 s | 3 s | 4 s |
| Fixed / Withdrawable version | Both | Both | Both | Both |
| Weight | 73 – 105 kg | 94 – 180 kg | 147 – 260 kg | 290 – 365 kg |
| Construction | Embedded pole | Embedded pole | Assembled / Embedded | Assembled pole |
* 4000 A with forced cooling · 3150 A with forced cooling in AP technology · Higher short-time withstand values available on request.
Designed for networks with high switching frequency and repeated short-circuit breaking operations.
Each vacuum interrupter is cast in resin during moulding — protected from shock, pollution and condensation. Ideal for humid and dusty environments.
Free-trip type with independent opening and closing regardless of the operator's action. Low maintenance requirement.
Vacuum interrupters are maintenance-free throughout their service life. No adverse effect on the vacuum even from frequent operation.
Exceptionally high operating reliability and long life — suitable for auto-reclosing duty on overhead lines and cable feeders.
Extremely compact, strongly built and low in weight. Small dimensions together with high interrupting capacity.
Can be remote-controlled when fitted with dedicated electrical accessories: gearmotor, opening and closing release.
UNVS1 circuit breakers handle all load-breaking operations occurring in practice — including short-circuit currents.
Their switching capacity is sufficient to handle any conditions arising from switching of equipment and system components under normal operating and fault conditions — particularly short-circuits.
Wenzhou Unisun Electric Co., Ltd. — manufacturer of MV electrical equipment, exporting to 60+ countries.
Tell us your requirement — rated voltage, current, breaking capacity, fixed or withdrawable type, quantity. We reply within 24 hours with a confirmed quotation.