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The SMD1812L-650-12V is a surface-mount polymeric PTC resettable fuse engineered to protect low-voltage electronic systems from overcurrent and short-circuit conditions. With an 1812 footprint, 6.5A hold current and 12V maximum operating voltage, it transitions rapidly to a high-resistance state during fault events and automatically resets after fault removal, making it suitable for power supplies, industrial electronics and battery-powered equipment.