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The Lennox 81G65 is an OEM double-pole double-throw (DPDT) latching relay rated for 24 volts, designed to maintain circuit states without continuous coil power in Lennox heating and cooling systems. If your system experiences erratic switching, failure to hold a set position, or intermittent operation, a faulty latch relay is often the cause. This genuine Lennox replacement ensures proper fit and reliable performance in compatible Lennox equipment.