ZN73S-24 Series (VCB)

ZN73S-24 Indoor high voltage vacuum circuit breaker is suitable for the indoor distribution equipment of 24kv, three phase AC 50Hz, it is mainly used to break and close the load current, over current and short-circuit current in the circuit, plays a control and protection role, and it’s the main switch components of medium central switchgear.

It is used for protection and control in power distribution systems of substations,enterprises and industrial and mining enterprises. It is suitable for rural power grids and places with frequent operations, especially for the needs of urban and agricultural network transformation.

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Product Detail

Main Function Characteristics

● The circuit breaker adopts copper-chromium contact material and a cup-shaped longitudinal magnetic field contact structure. The electrical wear rate of the contacts is smal, the dielectric insulation strength is stable, the recovery after arc is rapid, the cut-off level is low, the breaking ability is strong, and the electrical life is long.

● The operating mechanism is a spring energy storage mechanism arranged in a plane, which has manual energy storage and electric energy storage functions to make the operating performance of the circuit breaker more reliable.

MainTechnical Parameters and Characteristic Parameters of Circuit Breaker

No.	Name		Unit	Parameter
1	Rated voltage		kV	24
2	Rated frequency		Hz	50
3	Rated current		A	630	1250	1600,2000,2500
4	Rated short-circuit breaking current		kA	20	25	31.5
5	Rated peak withstand current		kA	50	63	80
6	Rated short time withstand current		kA	20	25	31.5
7	Rated short-circuit closing current		kA	50	63	80
8	Rated operation sequence			O-0.3s-CO-180s-CO
9	Mechanical life		Cycles	10000
10	Rated number of short circuit breaks		cycles	20
11	Power frequency withstand voltage 1min	Interphase,ground/break	kV	65/79
12	Lightning shock withstand voltage	Interphase,ground/break	kV	125/145
13	Allowable wear thickness of moving and fixed contacts		mm	3
14	Contact opening distance		mm	14±1
15	Contacts stroke		mm	4±1
16	Average opening speed (6mm just after opening)		m/s	1.3±0.2
17	Average closing speed (6mm just before closing)		m/s	1.0±0.2
18	Contact closing bounce time		ms	≤2
19	Three-phase opening and closing synchronicity		ms	≤2
20	Main loop resistance (without touch arm)		μΩ	≤45
21	Closing time		ms	35-70
22	Opening time		ms	20-50
23	Interphase center distance		mm	210±0.5,275±0.5

Overall and Installation Dimensions

1.Plum blossom contact 2.Vacuum interrupter pole 3. Mechanism frame 4.GDZ-58 plugs and sockets 5.Fixing plate 6.Mechanism panel 7. Pull-in/out trolley

Note: The pull-in stroke of the drawer is 300mm, and the size in the brackets is the outer drawing of the rated current above 2000A.