TZFN21-12D(R) Indoor high voltage vacuum load switch-fuse combination
Product characteristics
·True double-break design
·Small size and low cost
·Easy to operate
·High mechanical life
·Self-contained sensors and monitors
·Low environmental requirements
·Front or side operation available
TZFN21-12D(R)
Indoor high voltage vacuum load switch-fuse combination
Outline
TZFN21-12D/T630-20,TZFN21-12DR/T125-31.5 type high voltage vacuum load switch and combined electrical apparatus are suitable for three-phase AC 12 kV, 50 Hz distribution system. It has the advantages of compact structure, small volume, light weight, long life, strong closing and breaking ability, safety and reliability, etc. It can be used in conjunction with fuses (abbreviated as combiner), which can replace the circuit breaker with high cost, and its operation and maintenance are simple and convenient.
Environmental condition
·Altitude not exceeding 1000m;
·Ambient temperature -25 ℃ ~ 40 ℃;
·Relative humidity: the daily average value is not greater than 95 and the monthly average value is not greater than 90.
·Places free of conductive dust, corrosive gases and water vapor;
·Places free from fire and explosion hazards;
·Where there is no severe vibration and the inclination is less than 3 degrees.
Technical parameters of load switch
Serial No. |
Item |
Unit |
Numerical Value |
|
1 |
rated voltage |
KV |
12 |
|
2 |
rated current |
load switch |
A |
630 |
composite apparatus |
125 |
|||
3 |
rated short-circuit closing current |
KA |
50 |
|
4 |
rated short-circuit breaking current |
KA |
31.5 |
|
5 |
rated active load breaking current |
A |
630 |
|
6 |
45 thermal stable current |
KA |
20 |
|
7 |
dynamic current |
KA |
50 |
|
8 |
1min power frequency withstand voltage |
KA |
42 (fracture 48) |
|
9 |
lightning impulse withstand voltage |
KA |
75 (fracture 85) |
|
10 |
mechanical life |
times |
10000 |
|
11 |
rated transfer current (combination) |
A |
3150 |
|
12 |
motor operating power supply voltage |
V |
~110、220 |
Structural features, performance (and shape mounting dimensions, see the figure)
TZFN21-12 load switches and combinations are mainly composed of frame, disconnector (or fuse acts as disconnector), vacuum switch tube, grounding switch, operation mechanism, etc.
This product has compact structure, small size, long life and strong closing ability. The vacuum switch is equipped with electric operating mechanism and energy storage spring, which can realize fast closing and separating operation. Disconnect switches, vacuum switches, and grounding switches interlock each other to prevent misoperation. Features: installation and commissioning is cumbersome, and it is complicated in the production and installation of switches and cabinets. But it has obvious isolation fractures.
1. Frame 2. isolation knife 3. fuse 4. insulated pull rod 5. upper bracket 6. arc extinguish chamber 7. grounding knife static contact 8. insulator 9. grounding knife 10. ground spring 11. switch spring 12. insulating pull rod 13. spindle 14. operation mechanism 15. axis 16. linkage pull rod 16 17. operating mechanism load switches without fuses (item 3) and tripping mechanisms (item 14)
Ordering instruction
When ordering, specify the product model, name, specification, quantity, operating mechanism voltage.