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Home/Vacuum Circuit Breaker Parts/VCB Spring Operating Mechanism/SL-1 Spring Operating Mechanism For Medium-voltage Vacuum Circuit Breakers SL-1 Spring Operating Mechanism For Medium-voltage Vacuum Circuit Breakers
The SL-1 Spring Operating Mechanism is a high-reliability operating solution designed for indoor medium-voltage vacuum circuit breakers. It is compatible with VK, VS1 and equivalent VCB types, suitable for both fixed-mounted and withdrawable switchgear panels.
With a compact structure, low closing energy requirement and high transmission efficiency, the SL-1 mechanism significantly reduces operating load while ensuring stable performance, long service life and low operating noise. The product complies with GB1984 (AC High Voltage Circuit Breakers) and relevant IEC standards, making it suitable for global medium-voltage distribution applications.
Electrical ProductsKey Advantages of SL-1 Spring Operating Mechanism
1. Compact size & low closing energy: Closing energy is approximately 7 kg·m at 31.5 kA breaking capacity
2. High compatibility: Suitable for VK, VS1 and similar indoor VCBs, including fixed and withdrawable switchgear
3. High reliability: Simple mechanical structure, flexible operation, mechanical endurance ≥ 20,000 operations
4. Low maintenance: Maintenance-free or minimal maintenance design with low operating noise
5. Strong adaptability: Supports different phase spacing and solid insulated pole configurations
Model Designation
SL-1 / GF-G: Fixed-mounted spring operating mechanism
SL-1 / GF-Y: Withdrawable spring operating mechanism
Main Technical Parameters of SL-1 Spring Operating Mechanism
| S/N | Item | Unit | Data | ||
| 1 | Contact opening distance | mm | 10 ± 1 mm | ||
| 2 | Contact stroke | mm | 3.8 – 4.6 mm | ||
| 3 | Three-phase closing/opening simultaneity | ms | ≤ 2 ms | ||
| 4 | Contact bounce time (closing) | ≤ 2 ms | |||
| 5 | Phase center distance | mm | 210 ± 1.5 | 230 ± 1.5 | |
| 6 | Rated short-circuit breaking current | kA | 25 | 31.5 | 40 |
| 7 | Contact pressure after closing | N | 2600±100 | 3150±150 | 4500±300 |
| 8 | Average opening speed (70% after contact separation) | m/s | 1.3 ± 0.2 | ||
| 9 | Average closing speed (30% before contact closing) | m/s | 0.8 ± 0.2 | ||
| 10 | Opening / closing time | ms | 25 – 75 | ||
| 11 | Output shaft rotation angle | ° | 30° – 33° | ||
Energy Storage System
Energy storage methods:
Motor-operated energy storage (permanent magnet DC motor)
Manual energy storage with multi-stage reduction mechanism
Motor Specifications
Rated control voltage: DC 220 V / DC 110 V
Rated power: 120 W
Energy storage time: ≤ 12 s at rated voltage
Closing, Opening and Protection Devices
Closing / opening release: Solenoid type
Available control voltages: DC 220 V / DC 110 V / DC 48 V / DC 24 V
Overcurrent release:
Rated current: 5 A
Reliable tripping range: 90% – 110% of rated current
Refer to the dimensional drawing for external dimensions.
Applications:
Indoor medium-voltage switchgear
Power distribution and industrial power systems
Fixed-type and withdrawable-type switchgear panels
Installation & Maintenance of SL-1 Spring Operating Mechanism
Installed using M8 bolts
Lubrication required at all moving parts during installation
Factory-adjusted before delivery, only routine inspection required on site
Periodic operational checks recommended for long-term reliability
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