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The Lennox 27P37 is a genuine OEM fused disconnect switch rated at 30 amps and 240 volts for single-phase applications, designed to provide a safe and reliable means of disconnecting electrical power to your Lennox HVAC system during service or emergencies. Symptoms of a failing disconnect include inability to power the unit on or off, tripped breakers, or visible signs of burning or melting around the disconnect housing. This part is a direct OEM replacement engineered to meet Lennox specifications for compatible residential and light commercial systems.