Supco Microwave Universal Door Switch, 3 Wire, 3/16" Terminals, 21 Amp 28QBP0491

Supco ES0491 Universal Microwave Door Switch | 3 Wire | 21 Amp | 28QBP0491

Brand New – Supco® ES0491 Universal Replacement Door Interlock Switch for Standard Microwave Ovens

Restore safe and reliable microwave operation with this universal 3-wire door switch, Supco® part ES0491 (also known as 28QBP0491). Designed to interrupt power when the door is open, this switch ensures the microwave only operates when securely closed. Ideal for resolving startup failures, intermittent heating, or door sensing errors caused by worn or faulty switches.

⚙️ Product Specifications:

• ✅ 3-Terminal configuration: Common (COM), Normally Open (NO), Normally Closed (NC)
• 3/16" male spade terminals
• Rated: 21 Amp @ 125/250 VAC
• Universal fit for standard microwave interlock assemblies
• Condition: Brand New – Unused

Replaces Part Numbers:

Universal replacement – no alternate part numbers listed

✅ Compatible Models:

Universal fit for microwave ovens using 3-wire, 21A door switches with 3/16" male connectors. Please verify your microwave’s original switch configuration and terminal type before purchase.

Common Fixes:

• ❌ Microwave won’t start or stops mid-cycle
• ⚠️ Door not registering as closed
• Intermittent heating or control board errors
• Replacement for worn, stuck, or failed door switch

️ Installation Tips:

• Disconnect power before servicing appliance
• Access switch via control panel or door latch assembly
• Remove screws or clips securing old switch
• Install new switch, reconnect terminals (COM, NO, NC), and secure in place
• ✅ Restore power and test door sensing and microwave operation