This vacuum electromagnetic starter is ideal for mines having explosive gases (Methane) and coals, and is used in AC 50Hz, 1140(660)V power supply circuit. The vacuum electromagnetic starter can control, start, stop, reverse rotation and double-switch 6-12 3-phase AC asynchronous inductance motors or 3-6 AC double-winding and double-speed motors. It can protect motors and their power supply circuits. The vacuum electromagnetic starter is attached in KJ2000 mine electric power automatic control and comprehensive measurement and monitor systems to realize automatic control on power supply equipment in mining areas. The starter has all Chinese LCD touch screen display offering a highly stable performance and highly reliable man-machine conversation function.
Technical Specifications of Vacuum Electromagnetic Starter
Table 1 Overload, Short-circuit, and Phase Failure Protection
| No. | Protection Items | Work Condition | Start Time | Start Status | Reset | |
| Work Current/Current Setting | ||||||
| 1 | Overload Protection | 1.05 | 2h no action | Start from cold state | Manual | |
| 2 | 1.20 | 5min＜t ＜20min | Start from hot state | |||
| 3 | 1.50 | 1min＜t ＜3min | Start from hot state | |||
| 4 | 6 | 5s＜t ＜16s | Start from cold state | |||
| 5 | 3-phase Short Circuit Protection | 7, 8, 9 | (200-400)ms | Start from cold state | ||
| Phase Failure Protection | 2nd phase at random | 3rd phase | ||||
| 6 | 1.0 | 1.15 | No action | Start from cold state | ||
| 7 | 0.9 | 0 | ＜20min | Start from hot state | ||
Table 2 Under Voltage, Over Voltage and Leakage Protection Features
| No. | Protection Items | Work Condition | Action Parameters |
| 1 | Under Voltage Protection | Uw | Uw ＜5%Un |
| 2 | Over Voltage Protection | Uw | Uw ＞10%Un |
| 3 | Load line insulation resistance to earth | Load line insulation resistance to earth | R≦22k +20%(660V) R≤ 40k +20%(1140V) |
| 4 | Leakage Unlock | Load line insulation resistance to earth | No less than 1.5 times of the leakage locking value |
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