QJR-200/315/400 Mining Explosion proof and Intrinsic Safety Vacuum Electromagnetic Soft StarterDetailed product description：

One purpose

The QJR-200/315/400 mining explosion-proof and intrinsic safety vacuum electromagnetic soft starter is used for underground coal mines with explosive gases and coal dust. In a power supply system with AC 50Hz and voltage of 1140V (660V), it can perform soft start, current limiting start, full voltage start, natural stop, soft stop, pump stop, etc. for three-phase squirrel cage motors with current below 400A, and provide comprehensive protection for the circuit and motor. It can also perform interlocking sequence control for multiple devices of the same model.  

Two functions
Adopting advanced all digital technology to achieve dual closed-loop control of current and speed, with functions such as soft start, soft stop, pump stop, sudden jump start, and pulse start detection.
It has protection against leakage lockout, overload, short circuit, phase failure, undervoltage, loss of voltage, temperature, etc;
Having its own detection function, it can provide various protections such as line faults and thyristor overheating;
Various control methods are easy to set, and parameters can be continuously adjusted;
Adopting advanced intelligent comprehensive protection devices in China, with LCD display and Chinese digital menu, the core components adopt advanced single-chip fully digital transmission controllers.  

Technical Parameters and Specifications of Three QJR-200/315/400 Mining Explosion proof and Intrinsic Safety Vacuum Electromagnetic Soft Starter

model	Rated voltage (V)	Rated current (A)	Maximum power (KG)
QJR-400	1140/660	four hundred	590/340
QJR-315	1140/660	three hundred and fifteen	450/270
QJR-200	1140/660	two hundred	350/200