FZN21-12 Indoor load break switch (LBS) 12KV

FZN21-12 type of indoor AC high voltage load switch- fuse combination units appliances for three-phase AC 10kV, 50Hz power system, or with the complete power distribution equipment and loop-network switch cabinet , combined substation and other ancillary uses, is widely used in urban network construction and transformation engineering, industrial and mining enterprises, high-rise buildings and public facilities ,can be used as ring power supply unit or terminal equipment, play power distribution, control and protection. Technical performance of the products meet the IEC publication 60265-1/FDIS

Product Detail

Structural features

load switch, grounding switch, fuse and instructions in a framework that can be flexibly combined, compact, convenient and easy to install a small volume.
the fracture is direct acting arrangement. dynamic and thermal stability current parameters is high, time to complete the operation.
with static contact insulation cover, so RMU in the structure to achieve the isolation, eliminating the phase insulating spacer, fracture insulation boards that can prevent internal arc short circuit accident.
has a unique valve structure, load switch after opening the shutter automatically fracture isolation, good protective properties.
load switch and grounding switch, a reliable mechanical locking device between the fuse. to meet the "Five Anti requirements.

Two forms of electric operations 6, with manual operation and AC and DC operating power supply, easy to implement power system, "three remote' requirements.

Technical parameter

No	Item		Unit	Value
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	Arc-quenching chamber fracture 30
		Effective value		Earth , phase 42, insulating fracture 48
		Lightning impulse withstand voltage (peak)		Earth , phase 75, insulating fracture 85
5	Rated dynamic current (peak)		kA	50
6	4S thermal current		kA	20
7	Rated power load breaking current		A	630
8	Rated closed-loop breaking current		A	630
9	Rated cable charge breaking current		A	10
10	Rated breaking no-load transformer capacity		kV	1250
11	Rated breaking AC current		A	3150
12	Rated short-circuit closed current		kA	50
13	Rated current breaking times		times	2000
14	Mechanical life		times	10000
15	Permitted wear-thickness of vacuum arc-quenching chamber contact		mm	2
16	Manual operating torque		Nm	>200