High Voltage Load Switch
Product Title
Product Details
FZN25-12D vacuum load switch and FZN25-12DR combination apparatus are mainly used in 12kV three-phase AC 50Hz ring network or terminal power supply urban distribution stations and industrial electrical equipment, for load control and short-circuit protection. Because the combination apparatus provides more reliable protection for transformers and other electrical equipment than circuit breakers, it is especially suitable for ring network, dual-radial power supply units and compact substations. FZN25-12R/630A, FZN25-12DR/T125-31.5 Indoor Vacuum Load Switch adopts an integrated spring operating mechanism, with large breaking capacity. With current-limiting fuses, it can achieve full-range protection for transformers, suitable for power distribution places with high reliability requirements.
Main Technical Parameters
| No. | Item | Unit | FZN25-12D/T630-20 | FZN25-12DR/T125-31.5 |
| 1 | Rated Voltage | kV | 12 | 12 |
| 2 | Rated Frequency | Hz | 50 | 50 |
| 3 | Rated Current | A | 630 | 100 |
| 4 | Rated Insulation Level | - | Interrupter gap: 30 / To earth and between phases: 42 / Isolating gap: 48 | |
| - | Lightning impulse withstand voltage: To earth and between phases: 75 / Isolating gap: 85 | |||
| 5 | 4S Thermal Stability Current | kA | 20 | - |
| 6 | Rated Dynamic Stability Current (Peak) | kA | 50 | - |
| 7 | Rated Closed Loop Breaking Current | A | 630 | |
| 8 | Rated Active Load Breaking Current | A | 630 | |
| 9 | Rated Cable Charging Breaking Current | A | 10 | |
| 10 | Rated Transfer Current | A | - | 2000 |
| 11 | Breaking Capacity of No-load Transformer | kVA | 1250 | |
| 12 | Rated Short-circuit Breaking Current | kA | - | 31.5 |
| 13 | Rated Short-circuit Making Current (Peak) | kA | 50 | 80 (expected value) |
| 14 | Earthing Switch Rated Thermal Stability Current (2S) | kA | 20 | |
| 15 | Earthing Switch Rated Dynamic Stability Current (Peak) | kA | 50 | |
| 16 | Rated Voltage of Opening/Closing Operating Power Supply | V | DC220, 110 / AC220, 110 | |
| 17 | Mechanical Life (Load Switch / Earthing Switch) | times | 10000/200 | |
Panel, Door Interlock Hole and Installation Diagram1. Cabinet door panel 2. Door interlock assembly |
Rear View of Cabinet Door Panel hole dimension: 340X120 |
| Note: L1, L2 dimensions are determined by users according to outline and installation dimensions | |
Ensure that FZN25-12DR/T125-31.5 Indoor Vacuum Load Switch FZN25-12DR combination apparatus, during installation, check that the fuse rated current matches the transformer capacity, the tripping mechanism operates sensitively, the vacuum interrupter gap insulation resistance is not less than 1000MΩ, and the spring mechanism opening/closing speed is adjusted according to the commissioning record...
FZN25-12R/630A, FZN25-12DR/T125-31.5 Indoor Vacuum Load Switch | Core Protection Device for Ring Main Units
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