JJB-660/380 Mining explosion-proof leak detection relayDetailed product description：

JJB-660/380 (formerly JY82-380/660A, B) mining explosion-proof leak detection relay is suitable for underground coal mines with explosive gases and coal dust. In a three-phase neutral point to ground insulated power supply network with AC 50Hz and voltage up to 660V, it cooperates with the main feeder switch to achieve first level leakage protection or two-level selective leakage protection, to prevent personal electric shock accidents and limit the expansion of other accidents caused by leakage.

JJB-660/380 Mining Explosion proof Leak Detection Relay Model


Technical parameters of JJB-660/380 mining explosion-proof leak detection relay

Network voltage		380V	660V
Action resistance value		3.5KΩ	11KΩ
Single phase path 1K Ω grounding action time	Without delay	≤50ms	300~400ms
	Add delay
After compensation, the maximum ground current for single-phase grounding through a 1K Ω resistor			120A

Note:
(1) The network distribution capacitance of the ground current after compensation is 0~1 microfarads per phase to ground;
(2) The contact group of the relay in the product can divide 1A current in a network with a voltage of 600V, frequency of 50Hz, and COS diameter of 0.4.