This product applies vacuum arc-extinguishing chamber. It features with reliable operation, long electric life and easy maintenance, breaking and making power supply frequently. The operation mechanism is inside switch gear combining disconnector, load break switch and earthing switch into one. It has compactable dimension and small weight. The disconnect gap lies in a serial with the vacuum arc-extinguishing chamber. The large dynamic stable current and thermal stable current, the interlinked procedures assure the operation coherently. Busbar and load break switch are separated fully by cone fixed contact, insulating cover and valve. Vacuum load break switch, earthing switch, valve and cubicle door are interlocked according to "5 protections" to prevent from miss-operation. The spring storage operation mechanism can be both operated by independent manual and motor to realize remote control. The CO operating power can be AC or DC source. Manual operation is generally on the right of switch, but can be changed to the left or obverse according to user's requirement. It is made as per IEC62271-105.

1. Altitude: 1000m;
2. Ambient temperature: -25 ~+40 ;
3. Relative humidity: daily average 95 , monthly average 90 ;
4. Earthquake intensity: 8 degree;
5. Applicable occasions should free from inflammables, explosives,corrosives and severe vibration.

FZN25-12D Vacuum load break switch and FZRN25-12D Combination

No. Item Unit FZN25-12D/T630-20 FZRN25-12D/T200-31.5 1 Rated voltage kV 12 2 Rated current A 630 ≤200 3 Rated frequency Hz 50/60 4 Rated insulating level 1min. PF withstand voltage kV arcing chamber gaps:30, phase to earth, phase to phase:42, across open contacts:48 5 lightning impulse withstand voltage(peak) kV phase to phase:75, across open contacts:85 kV 6 Rated short-time withstand current(thermal stable current) kA 20 - 7 Rated short-circuit duration s 4 - 8 Rated peak withstand current(dynamic stable current) kA 50 - 9 Rated active load breaking current A 630 - 10 Rated breaking current of closed-loop A 630 - 11 Rated breaking current of charging cable A 10 - 12 Rated breaking no-load transformer capacity kVA 1600 13 Rated short-circuit breaking current kA - 31.5 14 Rated transfer current A - 2000 15 Fuse model - SDLAJ-12/SFLAJ-12 16 Output power of impinger J - 2-5 17 Rated short-circuit making current kA - - 18 Rated short-time withstand current of earthing switch(thermal stable current) kA 20 19 Rated short-circuit duration of earthing switch s 2 20 Rated voltage of auxiliary loop V ∽220, 110 21 Mechanical life Times 10,000

Mechanical specification of FZN25-12D and FZRN25-12D

No. Item Unit FZN25-12D/T630-20 FZRN25-12D/T200-31.5 1 Clearance between electrified parts/ to earth mm ≥125 2 The thickness of conducting tube inject into fixed contacting base mm ≥18 3 Clearance between fixed and moving contact mm 4 Spring decrement under contact pressrue mm 5 Average closing speed of arc-extinguishing chamber m/s 0.9±0.5 6 Average opening speed of arc-extinguishing chamber m/s 0.6±0.2 7 Opening spring time ms ≤2 8 Three poles C/O asynchronous ms ≤3 9 Main circuit resistance μΩ ≤150 ≤300 10 Maximum moment of manual operation N.m ≤160 11 Opening time actuated by fuse ms - 30-40 12 Opening time actuated by release ms 40-45