Introducing our revolutionary product - the GM 250/300/400A 660/1440V Special Explosion-proof Isolation Reverse Switch for Coal Mines! As a factory, we take immense pride in offering this exceptional switch that guarantees utmost safety and reliability in coal mining operations. With its explosion-proof design, it ensures protection against potential hazards in volatile environments. This switch boasts a high amperage rating of 250/300/400A and a voltage range of 660/1440V, making it suitable for a wide range of applications. Trust our factory for a superior and dependable product that prioritizes safety in coal mining processes.