JJB-660/380 Flameproof Leak Relay 
 Relay Leak Relay Flameproof Leak Relay 
 Scope and purpose 
 JJB-660/380 type flameproof Leak Relay (hereinafter referred to as the leak detection relays) applies to an explosive mixture of gases (methane) and coal dust in the coal mine, in the AC 50HZ, voltage up to 660V three-phase in Point-to-ground insulation of the power supply network, together with the total care to prevent personal accidents and limit the leakage of electric shock and other accidents caused by the expansion. 
 Leak Relay by GB3836.1-2000 "Electrical apparatus for explosive gas atmospheres Part 1: General requirements", GB3836.2-2000 "Electrical apparatus for explosive gas atmospheres Part 2: Flameproof" d "" and other relevant standard design, manufacturing and testing. 
 Technical parameters 
 Network voltage V action potential blocking power Yam Yam value value KΩ KΩ 1KΩ ms operating time when the resistance movement after the single-phase compensation into the earth by 1KΩ resistance mA maximum current into the earth 
 380 3.5 22 ≤ 30 / 
 660 11 7.0 ≤ 120 
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 QQ: 62 
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