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MS4 Post-Insulated Single-Phase Circuit Breaker

MS4 Post-Insulated Single-Phase Circuit Breaker， MS4-12-1250/25-05 Abbreviation: MS4-05， MS4-12-1250/31.5-06 Abbreviation: MS4-06， For air-insulated switchgear, used in arc suppression, fault line selection, phase selection, and bypass switching operations.

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Detailed Description

Serial Number	project	MS4-05	MS4-06
1	Rated voltage, kV	12	12
2	Rated current, A	1250	1250
3	Rated power frequency withstand voltage, kV	42	42
4	Rated impact withstand voltage, kV	85	85
5	Rated short-circuit breaking current, kA	25	31.5
6	Rated short-circuit making peak current, kA	63	80
7	Rated short-time withstand current, kA	63	80
8	Rated short-time withstand time, s	4	4
9	Rated frequency, Hz	50	50
10	Phase spacing, mm	--	--
11	Contact gap, mm	8±0.5	8±0.5
12	Overtravel of the mechanism, mm	2±0.5	2±0.5
13	Rated operating cycle	O-0.3s-CO-15s-CO	O-0.3s-CO-15s-CO
14	Inherent closing time, ms	<25	<25
15	Three-phase closing asynchronously, ms	--	--
16	Close-in bounce time, ms	≤2	≤2
17	Inherent tripping time, ms	5±0,5	5±0,5
18	The three-phase tripping was not synchronized, ms	--	--
19	Mechanical life, cycles	50000	50000
20	Electrical life (rated short-circuit current), times	50	50
21	Number of auxiliary switches	3NO+2NC	3NO+2NC
22	Weight, kg	14	14