Product Features
(1) Intelligent Setting
The low‑voltage feeder switch is equipped with a low‑voltage intelligent protection device, featuring precise earth leakage protection to effectively prevent cascade tripping caused by earth leakage faults. In addition, with the integration of a smart setting system, it enables intelligent parameter setting — including one‑key setting, automatic rationality verification, and adaptive adjustment to load changes. This thoroughly solves the problem of parameter setting in coal mines, fully replacing the complex and tedious manual setting work of specialized personnel, ensuring settings are accurate and reasonable, and eliminating safety hazards caused by unscheduled or large‑scale power outages due to improper settings.
(2) Remote One‑Key Earth Leakage Test
The low‑voltage feeder switch features a remote one‑key earth leakage test function, which allows the test to be initiated via the remote monitoring system. The system automatically performs the earth leakage test, restores power automatically, and generates a test report upon completion. This eliminates the issues of "skipping tests" or "false testing" in remote leakage tests. Test personnel do not need to go underground, reducing labor intensity and improving test efficiency.
(3) Remote Intelligent Monitoring
Equipped with remote intelligent monitoring capabilities, including "four‑remote" functions (telemetry, remote signaling, remote control, and remote adjustment), it fills the gap in the intelligent construction of low‑voltage distribution equipment at mining power distribution points and working faces.
(4) Precision Metering
Real‑time monitoring of voltage, current, and power factor for each phase of three‑phase motors, with calculation of instantaneous and cumulative electrical energy consumption for optimized energy efficiency.
Product Parameters
| Model | Rated Voltage (V) | Rated Current (A) | Overall Dimensions (L×W×H) mm |
|---|---|---|---|
| QJZ‑200/1140(660) | 1140 (660) | 200 | — |
| QJZ‑300/1140(660) | 1140 (660) | 300 | — |
| QJZ‑400/1140(660) | 1140 (660) | 400 | — |
Operating Conditions
The equipment is designed for use under the following conditions:
a) Altitude not exceeding 2000m;
b) Ambient temperature: –5°C to +40°C;
c) Relative air humidity not exceeding 95% (at +25°C);
d) Atmospheric pressure: 80–110 kPa;
e) In hazardous locations with explosive gas mixtures of methane and coal dust;
f) In locations free from steam or corrosive gases that may damage metals and insulating materials;
g) In environments without significant swaying or severe impact vibrations;
h) In locations free from dripping water;
i) Installation inclination relative to the horizontal not exceeding 15°;
j) Pollution degree: Class 3;
k) Installation category: Category III.
Product Features
(1) Intelligent Setting
The low‑voltage feeder switch is equipped with a low‑voltage intelligent protection device, featuring precise earth leakage protection to effectively prevent cascade tripping caused by earth leakage faults. In addition, with the integration of a smart setting system, it enables intelligent parameter setting — including one‑key setting, automatic rationality verification, and adaptive adjustment to load changes. This thoroughly solves the problem of parameter setting in coal mines, fully replacing the complex and tedious manual setting work of specialized personnel, ensuring settings are accurate and reasonable, and eliminating safety hazards caused by unscheduled or large‑scale power outages due to improper settings.
(2) Remote One‑Key Earth Leakage Test
The low‑voltage feeder switch features a remote one‑key earth leakage test function, which allows the test to be initiated via the remote monitoring system. The system automatically performs the earth leakage test, restores power automatically, and generates a test report upon completion. This eliminates the issues of "skipping tests" or "false testing" in remote leakage tests. Test personnel do not need to go underground, reducing labor intensity and improving test efficiency.
(3) Remote Intelligent Monitoring
Equipped with remote intelligent monitoring capabilities, including "four‑remote" functions (telemetry, remote signaling, remote control, and remote adjustment), it fills the gap in the intelligent construction of low‑voltage distribution equipment at mining power distribution points and working faces.
(4) Precision Metering
Real‑time monitoring of voltage, current, and power factor for each phase of three‑phase motors, with calculation of instantaneous and cumulative electrical energy consumption for optimized energy efficiency.
Product Parameters
| Model | Rated Voltage (V) | Rated Current (A) | Overall Dimensions (L×W×H) mm |
|---|---|---|---|
| QJZ‑200/1140(660) | 1140 (660) | 200 | — |
| QJZ‑300/1140(660) | 1140 (660) | 300 | — |
| QJZ‑400/1140(660) | 1140 (660) | 400 | — |
Operating Conditions
The equipment is designed for use under the following conditions:
a) Altitude not exceeding 2000m;
b) Ambient temperature: –5°C to +40°C;
c) Relative air humidity not exceeding 95% (at +25°C);
d) Atmospheric pressure: 80–110 kPa;
e) In hazardous locations with explosive gas mixtures of methane and coal dust;
f) In locations free from steam or corrosive gases that may damage metals and insulating materials;
g) In environments without significant swaying or severe impact vibrations;
h) In locations free from dripping water;
i) Installation inclination relative to the horizontal not exceeding 15°;
j) Pollution degree: Class 3;
k) Installation category: Category III.
