MS4 Pillar type 3-phases circuit breaker

Suitable for both SF6 and air-insulated switchgear.
Rated current 1250 A for high-load applications.
High short-circuit breaking capacity up to 31.5 kA.
Robust mechanical life of 50,000 operations.
Compact pillar-type design saves space.
Reliable auxiliary contacts (6NO+6NC) included.

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Describe Display

The MS4 Pillar Type 3-Phases Circuit Breaker is available in models suitable for both SF6 gas-insulated RMUs and air-insulated switchgear. It is rated for 12 kV, with a current rating of 1250 A and breaking capacities up to 31.5 kA.

Product parameters

No.	Item	Unit	MS4-01	MS4-02	MS4-03	MS4-04
1	Rated voltage	kV	12	12	12	12
2	Rated current	A	1250	1250	1250	1250
3	(1min)Rated power frequency withstand voltage	kV	42	42	42	42
4	Rated impulse withstand voltage	kV	85	85	85	85
5	Rated short circuit breaking current	kA	25	31.5	25	31.5
6	Rated peak withstand current	kA	63	80	63	80
7	Rated short-circuit withstand current	kA	25	31.5	25	31.5
8	Duration of short circuit	s	4	4	4	4
9	Rated frequency	Hz	50	50	50	50
10	Phase center distance	mm	150	150	210	210
11	Contact distance	mm	8±0.5	8±0.5	8±0.5	8±0.5
12	Over travel	mm	2±0.5	2±0.5	2±0.5	2±0.5
13	Rated operation cycle	-	O-0.3s-CO-15s-CO
14	Inherent closing time(don’t include DM time)	ms	＜25	＜25	＜25	＜25
15	Different time of closing operation	ms	≤2	≤2	≤2	≤2
16	Bouncing time	ms	≤2	≤2	≤2	≤2
17	Inherent opening time(don’t include DM time)	ms	5±0.5	5±0.5	5±0.5	5±0.5
18	Different time of opening operation	ms	≤2	≤2	≤2	≤2
19	Mechanical operations(CO-cycles)	Times	50000	50000	50000	50000
20	Rated short-circuit-breaking current time	Times	50	50	50	50
21	Number of auxiliary switches	pcs	6NO+6NC
22	Weight	kg	34	34	34	34

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