3-phase Pillar type Magnetically controlled vacuum circuit breaker
Key attributes
| Brand | Wone Store |
| Model NO. | Pillar type Magnetically controlled vacuum circuit breaker |
| Rated voltage | 12kV |
| Rated normal current | 1250A |
| number of poles | 3P |
| Rated short circuit breaking current | 25kA |
| Phase distance | 210mm |
| Series | MS4 |
Product descriptions from the supplier
The MS4-12-630/20-XX series circuit breakers are indoor switchgear based on semi-hard magnetic material actuator mechanisms. It is used in three-phase AC power systems with a rated voltage of 12KV and a frequency of 50-60Hz, serving as a protective and control device. It is particularly suitable for frequent operations at the rated current or multiple breaking of short-circuit currents. This series of circuit breakers includes the circuit breaker and the drive module.
The structure of the circuit breaker
Each phase has one actuator mechanism, which is installed perpendicularly and axially with the vacuum interrupter. The three excitation coils are connected in parallel. The three-phase actuator
mechanisms achieve synchronous action through the synchronous shaft and simultaneously generate auxiliary switch position signal output.
The vacuum interrupter adopts an external bellows, and the bellows is made by the stainless steel lamination welding process. The contact opening distance is 8mm and the overtravel is 2mm. The contacts are designed based on the principle of longitudinal magnetic field arc extinguishing.
Contact pressure spring on the insulating rod to ensure reliable contact between the moving and static contacts of the VI and that the related actions comply with the operational characteristic
requirements.
The insulating frame is made of SMC, which encloses the upper and lower terminals, operating insulating rods, flexible connections, vacuum interrupters and other components, playing the role of insulation and support.
Application
MS4-01/02 Suitable for SF6 gas insulated RMU
MS4-03/04 Suitable for air insulated switchgear
Technology 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 |
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 |
Note：Aluminum heat sinks need to be added.
Dimension
Related Products
-
3-phase transparent shell Magnetically controlled vacuum circuit breaker
-
Single-phase Magnetically controlled vacuum circuit breaker
-
single-phase Shell type Magnetically controlled vacuum circuit breaker
-
3-phase Shell type Magnetically controlled vacuum circuit breaker
-
Pillar type Magnetically controlled vacuum circuit breaker
-
3-phase Magnetically controlled vacuum circuit breaker
-
SSCB Series Solid-State Circuit-Breaker
Related Knowledges
-
How to properly inspect and maintain a transformer?1 Transformer Testing and Protection Grounding is divided into working grounding and protective grounding. Working grounding: Grounding performed to meet the operational requirements of equipment.Protective grounding: Grounding implemented to prevent the metal enclosures of operating electrical equipment, structures of switchgear installations, and transmission towers from becoming energized, thereby endangering personal and equipment safety. Therefore, grounding of the transformer neutral pointOliver Watts10/18/2025 -
How to select a dry-type transformer?1. Temperature Control SystemOne of the main causes of transformer failure is insulation damage, and the greatest threat to insulation comes from exceeding the allowable temperature limit of the windings. Therefore, monitoring temperature and implementing alarm systems for transformers in operation are essential. The following introduces the temperature control system using the TTC-300 as an example.1.1 Automatic Cooling FansA thermistor is pre-embedded at the hottest spot of the low-voltage winJames10/18/2025 -
Comprehensive Analysis of Global Transformer StandardsComparison of Domestic and International Transformer StandardsAs a core component of power systems, the performance and safety of transformers directly affect grid operation quality. The IEC 60076 series standards established by the International Electrotechnical Commission (IEC) correspond multidimensionally with China’s GB/T 1094 series standards in technical specifications. For example, regarding insulation levels, IEC specifies that power frequency withstand voltage for transformers rated atNoah10/18/2025 -
How to Choose the Right Transformer？Transformer Selection and Configuration Standards1. Importance of Transformer Selection and ConfigurationTransformers play a critical role in power systems. They adjust voltage levels to suit different requirements, enabling electricity generated at power plants to be efficiently transmitted and distributed. Improper transformer selection or configuration can lead to serious issues. For example, if the capacity is too small, the transformer may not support the connected load, causing voltage droJames10/18/2025 -
How to handle transformer faults?Common transformer faults and their handling methods.1. Transformer OverheatingOverheating is extremely harmful to transformers. Most transformer insulation failures are caused by overheating. Rising temperature reduces the dielectric strength and mechanical strength of insulation materials. IEC 354, Loading Guide for Transformers, states that when the hottest spot temperature of a transformer reaches 140°C, bubbles will form in the oil. These bubbles can reduce insulation performance or cause fFelix Spark10/18/2025 -
How to Inspect 10kV Vacuum Circuit Breakers ProperlyI. Inspection of Vacuum Circuit Breakers During Normal Operation1. Inspection in Closed (ON) Position The operating mechanism should be in the closed position; The main shaft roller should be disengaged from the oil damper; The opening spring should be in a charged (stretched) energy-stored state; The length of the moving contact rod of the vacuum interrupter protruding below the guide plate should be approximately 4–5 mm; The bellows inside the vacuum interrupter should be visible (this does noFelix Spark10/18/2025
Related Solutions
-
Dedicated Vacuum Contactor Solution for Port Shore Power SystemsI. Background and ChallengesShore power systems have become core technical equipment for ports to reduce carbon emissions and noise pollution. However, these systems face two major challenges in the harsh operational environment of ports:Severe Environmental Corrosion: High humidity and salt spray in port areas cause serious corrosion to metal components and enclosures of electrical equipment, significantly impacting electrical lifespan and operational reliability.High Switching Requirements:Wone Store09/13/2025 -
ABB Vacuum Contactor KC2 Power Supply System Technical Transformation PlanIssue OverviewThe 10kV air compressor starting system of a company utilizes the ABB vacuum contactor KC2 as the control component for the operating circuit. The dedicated wide-voltage power supply module paired with this contactor presents the following issues:Frequent failures: The power supply module fails to properly transition the voltage from 300V to 12V, resulting in fuse blowouts.Poor heat dissipation: Enclosed installation of the module leads to insufficient heat dissipation, accelerWone Store09/13/2025 -
Solution for Medium-Voltage Motor Control and Protection Using Vacuum Contactor-Fuse (VCF) in a Coal Conveying System1.Project BackgroundA coal conveying system comprises 15 belt conveyors driven by medium-voltage motors. The system operates under complex conditions, with motors often subjected to heavy loads and frequent starts. To address these challenges and achieve effective control and reliable protection during motor startup, the project comprehensively adopts Vacuum Contactor-Fuse (VCF) combination devices for the 6kV medium-voltage motor power distribution. This solution details the technical features,Wone Store09/13/2025
