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BEIQIANG Power provides professional power products and comprehensive
solutions to ensure the safety of electricity consumption.
Suitable for three-phase AC 12kV, 50Hz distribution systems, it has the advantages of compact structure, small volume, light weight, long service life, strong making and breaking ability, safety and reliability, etc
General
FZ(R)N21-12D indoor high-voltage alternating-current vacuum load switch-fuse combination("combination"for short)is used in powersystems with an AC frequency of 50 Hz and a rated voltage of 10 kV to break load currents,overload currents and short-circuit currents.Itparicularly applies to the places needing control,protection for oil-free,maintenance-free and frequently-operated ring network power supplyunits and terminal power supply transformers.
The combination is characterized by large breaking capacity,high safety and stability,long electrical life,support for frequent operation,lessmaintenance,etc.It has an apparent isolating gap,an earthing switch with making capability,an electric spring actuator and remote controlcapability.
Product standards
FZ(R)N21 indoor load switch is produced in line with the following standards and codes.
● GB 16926-1997 High-voltage alternating-current load switch-fuse combinationsIEC 60420 High-voltage alternating-current load switch-fuse combinations
Operating conditions
Normal operating conditions
Ambient temperature:-40℃~+40℃(below 35℃ within 24 hours)
● Relative humidity:≤95%(daily average)or ≤90%(monthly average)Altitude:≤1000m
Technical parameters
1.1 Technical parameters
| Item | Unit | Reference value |
| Rated voltage | kV | 12 |
| Rated frequency | Hz | 50 |
| Maximum rated current of the fuse | A | 125 |
| Rated transfer current | A | 3150 |
| Rated short-circuit breaking current(expected effective value) | kV | 31.5 |
| Rated short-circuic making current (expected peak value) | kV | 80 |
| 1min power-frequency Vacuum gap,interpole,pole-to-ground | kV | 42 |
| withstand voltage solating gap | kV | 48 |
| Lightning impulse Vacuum gap,interpole,pole-to-ground | kV | 75 |
| withstandvoltage lsolating gap | kV | 85 |
| Output energy of the fuse striker | J | 2~5 |
1.2 Technical parameters for disconnector assembling
| ltem | Unit | Reference value |
| Non-synchronous making of the three contacts | mm | ≥3 |
| Deviation of making of the three contacts | mm | ≤1 |
| Positive pressure of the contact switch | N | 260±30 |
| Size of the ga | mm | ≥150 |
| Circuit resistance | μQ | ≤40 |
Overall and Installation dimension
Overal dimension of FZN21-12D indoor high-voltage altemating-current vacuum load switch(top-in bottom-out and lefthand operation)
Overall dimension of FZ(R)N21-12D indoor highvotage altemating curent vacuum load switch-fuse combination(top in bottom-out and left hand operation)
General
FZ(R)N21-12D indoor high-voltage alternating-current vacuum load switch-fuse combination("combination"for short)is used in powersystems with an AC frequency of 50 Hz and a rated voltage of 10 kV to break load currents,overload currents and short-circuit currents.Itparicularly applies to the places needing control,protection for oil-free,maintenance-free and frequently-operated ring network power supplyunits and terminal power supply transformers.
The combination is characterized by large breaking capacity,high safety and stability,long electrical life,support for frequent operation,lessmaintenance,etc.It has an apparent isolating gap,an earthing switch with making capability,an electric spring actuator and remote controlcapability.
Product standards
FZ(R)N21 indoor load switch is produced in line with the following standards and codes.
● GB 16926-1997 High-voltage alternating-current load switch-fuse combinationsIEC 60420 High-voltage alternating-current load switch-fuse combinations
Operating conditions
Normal operating conditions
Ambient temperature:-40℃~+40℃(below 35℃ within 24 hours)
● Relative humidity:≤95%(daily average)or ≤90%(monthly average)Altitude:≤1000m
Technical parameters
1.1 Technical parameters
| Item | Unit | Reference value |
| Rated voltage | kV | 12 |
| Rated frequency | Hz | 50 |
| Maximum rated current of the fuse | A | 125 |
| Rated transfer current | A | 3150 |
| Rated short-circuit breaking current(expected effective value) | kV | 31.5 |
| Rated short-circuic making current (expected peak value) | kV | 80 |
| 1min power-frequency Vacuum gap,interpole,pole-to-ground | kV | 42 |
| withstand voltage solating gap | kV | 48 |
| Lightning impulse Vacuum gap,interpole,pole-to-ground | kV | 75 |
| withstandvoltage lsolating gap | kV | 85 |
| Output energy of the fuse striker | J | 2~5 |
1.2 Technical parameters for disconnector assembling
| ltem | Unit | Reference value |
| Non-synchronous making of the three contacts | mm | ≥3 |
| Deviation of making of the three contacts | mm | ≤1 |
| Positive pressure of the contact switch | N | 260±30 |
| Size of the ga | mm | ≥150 |
| Circuit resistance | μQ | ≤40 |
Overall and Installation dimension
Overal dimension of FZN21-12D indoor high-voltage altemating-current vacuum load switch(top-in bottom-out and lefthand operation)
Overall dimension of FZ(R)N21-12D indoor highvotage altemating curent vacuum load switch-fuse combination(top in bottom-out and left hand operation)