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This product is a vacuum load-break switch and combination unit, suitable for three-phase AC 50Hz ring-main or terminal supply and industrial power equipment, used for load control and short-circuit protection. The load-break switch can switch load current, closed-loop current, no-load transformer current, and cable charging current, while the combination unit can interrupt any current up to the rated short-circuit current.
Features:
It adopts a direct-drive isolating break linked with the vacuum interrupter, combining good isolation performance with breaking capability; it offers both manual and motorized operating functions, giving flexible operation suited to different on-site supply conditions.
Applications:
Widely used in ring-main units, box-type substations, and terminal distribution equipment, undertaking line load control and short-circuit fault protection, and is an important combination switching device in medium-voltage ring-main supply systems.
| Item | Unit | FZN25-12D/T630-20 | FZN25-12D/T125-31.5 | |
| Rated Voltage | kV | 12 | ||
| Rated Frequency | Hz | 50 | ||
| Rated Current | A | 630 | 125 | |
| Rated Insulation Level | 1min Power Frequency Withstand Voltage | kV | Vacuum interrupter break: 30; Phase to earth and phase to phase: 42; Isolating break: 48 | |
| Lightning Impulse Withstand Voltage | kV | Phase to earth and phase to phase: 75; Isolating break: 85 | ||
| Rated Dynamic Withstand Current (Peak) | kA | 50 | - | |
| 4s Thermal Withstand Current | kA | 20 | - | |
| Rated Active Load Breaking Current | A | 630 | 125 | |
| Rated Closed-Loop Breaking Current | A | 630 | 125 | |
| Rated Cable Charging Breaking Current | A | 10 | 10 | |
| No-Load Transformer Breaking Capacity | kVA | 1250 | 1250 | |
| Rated Short-Circuit Breaking Current | kA | - | 31.5 | |
| Rated Transfer Current | A | - | 870 | |
| Fuse Model | - | SDLAJ-12 SFLAJ-12 | ||
| Striker Output Energy | J | - | 2-5(Medium) | |
| Rated Short-Circuit Making Current | kA | 50 | ||
| Rated Dynamic Withstand Current of Earthing Switch | kA | 50 | ||
| 2s Thermal Withstand Current of Earthing Switch | kA | 20 | ||
| Rated Auxiliary Circuit Voltage | V | AC/CD220; 110 | ||
| Mechanical Life | cyc. | 10000 | ||
Zhejiang Yingchuang Electric Co., Ltd. was established in March 2018 and is a qualified approved supplier for State Grid and China Southern Power Grid. We specialize in the R&D and manufacturing of high-voltage electrical equipment, including primary-and-secondary integrated pole-mounted circuit breakers, indoor/outdoor vacuum circuit breakers, disconnecting switches, ring main units, and complete switchgear assemblies. Guided by "craftsmanship quality and sincere service," we offer full OEM/ODM customization across our entire product range. In 2024, we were recognized as a Provincial Innovative SME and a National High-Tech Enterprise.
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1948056561@qq.com
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Building 5, No. 88, Zhandong Road, Dianhou Industrial Zone, Liushi Town, Yueqing City, Wenzhou, Zhejiang Province, China
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