Product Overview
The Flameproof & Intrinsically Safe Vacuum Feeder Switch is suitable for underground coal mines and other environments containing explosive gases such as methane. It operates in AC 50 Hz systems at 1140 V or 660 V with currents up to 1000 A in ungrounded neutral systems, providing undervoltage, overload, short circuit, leakage lockout, leakage protection and selective leakage protection.
Product Description
At the head of every underground power distribution network stands the feeder switch — the device that protects the entire downstream circuit from electrical faults. In environments containing explosive gases such as methane, that switch must also be certified flameproof, because a single arc or spark could ignite the atmosphere. The Flameproof & Intrinsically Safe Vacuum Feeder Switch meets both requirements: full protection functions in a construction certified for underground coal mines and similar gas-risk environments.
The feeder switch is suitable for AC 50 Hz systems with rated voltages of 1140 V or 660 V and continuous currents up to 1000 A in ungrounded neutral systems — the voltage and current levels used in modern longwall and district power distribution. Vacuum interruption technology gives fast, reliable breaking with long electrical life and minimal maintenance, while keeping contact wear low even under repeated fault conditions.
Its protection functions include undervoltage, overload, short circuit, leakage lockout, leakage protection and selective leakage protection. The selective leakage function is particularly valuable in a distributed mine network: it isolates only the faulted branch instead of tripping the whole section, so the rest of the mine can continue operating. The feeder switch can work either as part of a coordinated protection system or independently, giving mine electricians the flexibility to use it as a stand-alone protector on smaller networks or as an integrated unit in a full protection scheme.
Key Features
- Suitable for underground coal mines and methane-containing atmospheres
- AC 50 Hz systems at 1140 V or 660 V, currents up to 1000 A
- Vacuum interruption for fast, reliable breaking
- Undervoltage, overload and short-circuit protection
- Leakage lockout, leakage protection and selective leakage protection
- Works in coordinated systems or independently
Technical Specifications
| Parameter | Value |
|---|
| Rated Voltage | 1140 V or 660 V AC |
| Rated Current | Up to 1000 A |
| System Frequency | 50 Hz, ungrounded neutral systems |
| Protection Functions | Undervoltage, overload, short circuit, leakage lockout, leakage protection, selective leakage protection |
| Interruption | Vacuum |
| Operating Mode | Coordinated system or independent |
| Safety Design | Flameproof and intrinsically safe |
Applications
Mine power distribution protection, district feeder protection in underground networks, methane-risk industrial power supply, and coordinated leakage and short-circuit protection schemes.
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