Overview
FZN25 and FZRN25 type vacuum load break switches and combined electrical apparatus are suitable for three-phase AC 50Hz ring network or terminal power supply and industrial power equipment, used for load control and short-circuit protection. The load break switch opens and closes load current, closed-loop current, no-load transformer and cable charging current. The combined electrical apparatus can break any current up to the rated short-circuit current. It adopts direct-acting isolation gap and vacuum interrupter linkage. It has manual and electric functions.
With the unique transmission structure design of FZN25 and FZRN25, the interrupter only bears high voltage at the instant of closing and opening, so it is small in size and light in weight.
FZN25 and FZRN25 can realize one-time operation of the isolation gap and the interrupter gap.
In FZN25 and FZRN25, between the static contact and the conductive cylinder of the moving contact, there is a grounding shutter interlocked with the earthing switch, which ensures safety and facilitates maintenance.
Main Technical Parameters
| No. | Item | Unit | Parameter | ||
| FZN25-12D/T630-20 | FZRN25-12D/T125-31.5 | ||||
| 1 | Rated voltage | kV | 12 | ||
| 2 | Rated frequency | Hz | 50 | ||
| 3 | Rated current | A | 630 | 125 | |
| 4 | Rated insulation level | 1min power frequency withstand voltage | kV | Interrupter gap 30; phase-to-earth, phase-to-phase 42; isolation gap 48 | |
| Lightning impulse withstand voltage | kV | Phase-to-earth, phase-to-phase 75; isolation gap 85 | |||
| 5 | Rated dynamic stability current (peak) | kA | 50 | - | |
| 6 | 4S thermal stability current | kA | 20 | - | |
| 7 | Rated active load breaking current | A | 630 | 125 | |
| 8 | Rated closed-loop breaking current | A | 630 | 125 | |
| 9 | Rated cable charging breaking current | A | 10 | 10 | |
| 10 | No-load transformer breaking capacity | KVA | 1250 | 1250 | |
| 11 | Rated short-circuit breaking current | kA | - | 31.5 | |
| 12 | Rated transfer current, rated making current | A | - | 2000 | |
| 13 | Fuse type | - | SDLAJ-12 SFLAJ-12 | ||
| 14 | Striker output energy | J | - | 2-5 (medium) | |
| 15 | Rated short-circuit making current | kA | 50 | ||
| 16 | Earthing switch rated dynamic stability current | kA | 50 | ||
| 17 | Earthing switch 2S thermal stability current | kA | 20 | ||
| 18 | Auxiliary circuit rated voltage | V | AC/DC220;110 | ||
| 19 | Mechanical life | times | 10000 | ||
