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Advanced Dsn-J Indoor Electromagnetic Earth Switch Lock Mechanism. Universal Voltage Compatibility: Supports AC220V, DC220V, and DC110V for broad adaptability. Forced Mechanical Locking: Electromagnetic bolt physically blocks handles to prevent misoperation. Emergency Manual Override: Includes dedicated key port for mechanical unlocking during maintenance. Durable Metal Construction: Cold-rolled steel casing with anti-corrosion treatment for longevity. OEM/ODM Customization: Full customization from samples, designs, or minor adjustments available. High Safety Standards: Ensures 'Five Protections' interlocking for substations and power systems.