The sturdy metal casing can be used in harsh working environments. The product has passed the explosion-proof certification of the National Low Voltage Explosion-proof Electrical Quality Inspection and Testing Center. Explosion proof certificate EX MB IIC T6 GB; EX MB IIIC T80 ℃ DB. Certificate Number: CLEX23.4689X Compliant with explosion-proof standards: GB/T3836.1-2021 Explosive Atmosphere Part 1 General Requirements for Equipment. GB/T3836.9-2021 Explosive Atmosphere Part 9 Equipment protected by rubber seal type "M". Usage environment: Zone 1, Zone 2, Zone 21, Zone 22 hazardous areas. The amplifier is embedded, and the action and reset time are both below 1ms. It has short-circuit protection and power polarity protection. The action mode can be selected through the control line.