1.Ambient temperature: -10°C~+40°C
2.Altitude: does not exceed 1000m
3.Humidity:
Relative humidity: daily average value does not exceed 95%, monthly average value does not exceed 90%;
Saturated vapor pressure: daily average does not exceed 2.2x10-3MPa, monthly average does not exceed1.8x10-3MPa.
4.Earthquake intensity: does not exceed 8 degree
5.The surrounding air should not be corrosive or combustible gas, steam and other obvious pollution
6.There is no regular violent vibration in the use place
Remark: If the not the same with the above using condition, can be customized.
| Table 1 | |||||
| Rated voltage kV | 12 | ||||
| Rated frequency (Hz) | 50 | ||||
| Rated insulation level | 1min Power frequency withstand voltage (interphase, phase to ground/fracture kV) | 42/48(Effective value) | |||
| Lightning impulse withstand voltage (interphase, phase to ground/fracture kV) | 75/85(Peak value) | ||||
| Rated operation sequence | O-t-CO-t'-CO* | ||||
| Main circuit resistance (mΩ) | ≤50 | ||||
| Mechanical life cycles | 10000 | ||||
| Model No. | Rated current (A) | Rated short-circuit breaking current (kA) | Rated short-closing current (peak kA) | Rated short-circuit continuous time (s) | Rated short-circuit breaking time |
| ZN73-12/630-20 | 630 | 20/25 | 50/63 | 4 | 50 |
| ZN73-12/1250-20 | 1250 | ||||
| ZN73-12/1250-31.5 | 1250 | 31.5 | 80 | 50 | |
| ZN73-12/1600-31.5 | 1600 | ||||
| ZN73-12/2000-31.5 | 2000 | ||||
| ZN73-12/2500-31.5 | 2500 | ||||
| ZN73-12/1250-40 | 1250 | 40 | 100 | 50 | |
| ZN73-12/1600-40 | 1600 | ||||
| ZN73-12/2000-40 | 2000 | ||||
| ZN73-12/2500-40 | 2500 | ||||
| ZN73-12/3150-40 | 3150 | ||||
Remark: * when the short-circuit breaking current is 20, 25, 31.5kA, t=0.3s, t'=180s, When the short-circuit breaking current is 40KA,t=180s,t'=180s.
Diagram 1 Inner electrical principle diagram for fixed type circuit breaker
Y1: Latching electromagnet Y7~Y9:Over-current trpping electromagnet KO:Anti-tripping relay within the mechanism
HQ: Closing electromagnet QF: Auxiliary switch for circuit breaker's main contacts TQ: Opening electromagnet
S1: Micro switch for energy storage S2: Limit switch for latching electromagnet M: Energy storage switch
Diagram 2 Inner electrical principal diagram for the withdrawable circuit breaker (with anti-trip, latching,over-current)
KO:Anti-tripping relay within the mechanism P:Manual operation mechanism Y1:Latching electromagnet HQ:Closing tripping TQ:Opening tripping
M:Energy storage motor S9:Auxiliary switch for the working position S8:Auxiliary switch for the testing position S2:Auxiliary switch for the latching electromagnet
S1:Micro switch for energy storage QF:Auxiliary switch for the circuit breaker's main contacts
Mechanical characteristics parameter for the circuit breaker(Table 2)
| Table 2 | Unit | Parameter | |||
| Contact's opening distance | mm | 11±1 | |||
| Contact's overstroke | mm | 3.5±0.5 | |||
| Three phase opening and closing synchronization | ms | ≤2 | |||
| Contact closing tripping time | ≤2 | ||||
| Opening time | ≤50 | ||||
| Closing time | ≤100 | ||||
| Average opening speed | 0.9~1.3 | ||||
| Average closing speed | 0.4~0.8 | ||||
| Closing contact's contact pressure | N | 20kA | 25kA | 31.5kA | 40kA |
| 2000±200 | 2400±200 | 3100±200 | 4750±250 | ||
| Accumulated allowable wear thickness for the moving and fixing contact | mm | 3 | |||
| Power supply for the operation (Table 3) | AC/DC | ||
| Rated voltage | 220V/110V | ||
| Rated power | Opening tripping | 264W | |
| Closing tripping | 264W | ||
| Energy storage motor | 20kA 25kA 31.5kA | 40kA | |
| 70W | 100W | ||
| Normal working voltage range | Opening tripping | 65%~120% of rated voltage | |
| Closing tripping | 85%~110% of rated voltage | ||
| Energy storage motor | 85%~110% of rated voltage | ||
| Energy storage time | ≤10s | ||
Diagram 3 Dimensions for the fixed type VCB
Diagram 4 Dimensions for the withdrawable type VCB
Note:1.The travel distance in the cabinet is 200mm; 2. Figure within the parentheses is the dimensions for the circuit breaker's rated current over 1600A
