EXP499 Microwave Door Switch (Normally Closed)
The EXP499 is a universal replacement normally closed (NC) door interlock switch for microwave ovens and microwave/oven combination units. This is a critical safety component: microwave door interlock switches exist specifically to cut power to the magnetron the instant the door opens, preventing any possibility of microwave radiation escaping the cavity while the door isn't fully closed and latched. This switch's normally closed contact design matches a wide range of microwave door latch mechanisms across GE, Whirlpool, Samsung, LG, Kenmore, and other brands.
Rated 16A, 125/250VAC. Over time, this switch's contacts can wear, pit, or fuse together from repeated cycling and the electrical load carried every time the door opens and closes. A failing interlock switch typically shows up as a microwave that won't start at all, a display that works but the unit won't heat, or intermittent operation tied to the door latch area. This is the normally closed counterpart to our EXP497 (normally open) and EXP480 (combined NC/NO) listings — always confirm which specific contact configuration your microwave's failed switch uses before ordering.
Quick Answer
The EXP499 Microwave Door Switch (Normally Closed) fixes microwave ovens and microwave/oven combos that won't start, won't heat, or operate intermittently near the door latch area. 16A, 125/250VAC, normally closed (NC) contact design. Never operate a microwave with a bypassed, disconnected, or suspected-faulty door interlock switch — these switches exist to prevent radiation exposure and must always be replaced with a properly rated part, never removed or defeated.
Common Problems This Part Fixes
Microwave won't start at all, even though the display and buttons respond normally
Microwave display and timer work, but the unit won't heat
Microwave stops working intermittently, especially around the door latch
Clicking or buzzing sound from the door area without the microwave starting
Breaker tripping when the door is opened, indicating a switch contact that has fused shut
Door that doesn't feel like it's latching securely
Cross Reference Information
Part numbers can change over a product's lifecycle as manufacturers update designs or release new appliance models. For your convenience, we've included any known superseded, alternate, or cross-reference part numbers that match this item.
Replaces Part Numbers
This microwave door switch directly replaces the following OEM and cross-reference part numbers:
WB24X830, AH237422, EA237422, WB24X0800, WB24X0830, WB24X10075, WB24X800, AP2024338, PS237422, WB24X25397, WB24X817, WB24X10112, WB24X0817, AP6037282, PS11766871, 00606695, 1386420, 606695, AH3477007, EA3477007, AP4067354, PS3477007, PS8726632, 5304408937, 5304509459, 5304464098, 4583655, AP6230614, PS12071302, ANE61784L0AG, AP7040623, WB24X10205, WB24X10147, 251201600930, 3025959, AP5790849, PS8754455, W10269458, W10211973, 1550016, 4393598, 8206347, AH2361111, EA2361111, AP4429884, PS2361111, 6600W1K001C, AP4650823, PS3529293, WB24X824, 253814, WB24X0824, AH237416, EA237416, AP2024332, PS237416, 5304456101, 1198245, 75304456101, AH1532505, EA1532505, AP3960662, PS1532505, 6600W1K001R, 1583495, AH3598700, EA3598700, AP5254801, PS3598700, 3405-001033, DE34-20019A, WP3405-001033, 2028596, 3405-000176, AP4044665, PS4131191, WB24X804 253795, WB24X0422, WB24X0804, WB24X422, AH237397, EA237397, AP2024313, PS237397, WB24X10189, 1810588, AH3486597, EA3486597, AP4980349, PS3486597, 3B73361E, 1325767, 3B73361D, 6600W1K003C, 6600W1K004B, AH3522736, EA3522736, AP4629337, PS3522736, 4415A66600, 1206671, 4415A66610, GSM-V1602A2, AP5322919
If your part number is not listed above, contact our support team before ordering and we will verify compatibility.
Compatibility
This door switch is a universal replacement compatible with convection microwave ovens, grill microwave ovens, microwave/oven combination units, and solo microwave ovens across many brands including GE, Whirlpool, Samsung, LG, and Kenmore, wherever the original switch matches this normally closed (NC) contact configuration and electrical rating.
Note: Microwave door interlock systems typically use two or three separate switches working together (primary interlock, monitor/secondary switch, and sometimes a third safety switch), and not all of them share this same normally closed (NC) configuration. This is a different part from our EXP497 (normally open) and EXP480 (combined NC/NO) listings. Confirm which specific switch position has failed on your microwave, and match the contact configuration and electrical rating exactly — never substitute a switch with a different configuration. Always verify your full model number before ordering. Contact our support team with your model number if you're unsure which switch your microwave needs.
Key Features
Universal replacement microwave door interlock switch — normally closed (NC) contact design
Resolves "won't start," "won't heat," and "intermittent operation near the door latch" symptoms caused by switch failure
Rated 16A, 125/250VAC
Suitable for convection, grill, combination, and solo microwave ovens
Direct drop-in replacement matching the original mounting and terminal configuration
Replaces a wide range of OEM part numbers across GE, Whirlpool, Samsung, LG, and Kenmore platforms — see full list above
Built to OEM-equivalent quality standards
Product Specifications
Part Number
EXP499
Part Type
Microwave Door Interlock Switch (Normally Closed)
Condition
New — Universal Replacement Part
Contact Configuration
Normally Closed (NC)
Max. Current
16A
Max. Voltage
125/250VAC
Terminal Size
4.7mm
Application
Convection, Grill, Combination, and Solo Microwave Ovens
Related Parts
EXP497 (normally open)
Quantity
1 door interlock switch
Installation Notes
⚠️ Danger — Never Bypass A Door Interlock Switch Unplug the microwave before beginning any work, and if it's a built-in or over-the-range unit, shut off power at the breaker as well. Microwave ovens also contain a high-voltage capacitor that can retain a dangerous electrical charge even after the unit is unplugged — avoid touching internal components near the capacitor and magnetron. Door interlock switches are a critical safety system: they exist specifically to cut power the instant the door opens, preventing microwave radiation from escaping the cavity. Never operate a microwave with an interlock switch disconnected, bypassed, or jumpered, even temporarily — doing so can expose you and others to microwave radiation. If you are not fully comfortable working inside a microwave's internal compartment, have a qualified appliance technician perform this repair instead.
⚠️ Photograph Wiring Before Disconnecting — Match The Failed Switch Exactly Wear work gloves. Remove the outer cabinet or access panel per your model's service instructions to reach the door switch assembly, typically located near the door latch mechanism. Photograph the wiring on the old switch before disconnecting anything, and confirm you're replacing the correct switch position if your microwave uses multiple interlock switches. Disconnect the wire terminals from the old switch, remove its mounting screws, and pull it free. Install the new EXP499 in the same position, reconnect each wire terminal to its original position, and secure the mounting screws. Reinstall the cabinet or access panel. Restore power and test that the microwave starts normally with the door closed, and — this is the critical safety check — confirm the unit stops heating immediately when the door is opened during a test run with a cup of water. Tools needed: Phillips screwdriver, work gloves.
Frequently Asked Questions
My microwave stopped working. How do I know if it's actually a door switch and not something else?
A common pattern is a microwave where the display and buttons respond normally, but pressing start does nothing, or the unit hums without heating — this points toward the door interlock circuit rather than the control board. Since these switches also serve a critical safety function, if you suspect a fault in this area, it's best to have it properly diagnosed and replaced rather than working around the symptom.
Is it safe to just disconnect a faulty interlock switch so the microwave will run?
No — this is not safe under any circumstances. Door interlock switches exist specifically to cut power to the magnetron the instant the door opens, preventing microwave radiation from escaping. Bypassing, disconnecting, or jumpering one of these switches removes that protection and can expose you and anyone nearby to microwave radiation, even if the microwave otherwise appears to run normally. Always replace a faulty switch with a correctly rated new one rather than working around it.
How is this different from your EXP497 and EXP480 listings?
These are different contact configurations for different switch positions in a microwave's door interlock system. This EXP499 is normally closed (NC) only. Our EXP497 listing is normally open (NO) only, and our EXP480 listing combines both NC and NO contacts in a single switch body. Since most microwaves use two or three interlock switches with different configurations, check which contact type your specific failed switch uses before ordering.
My microwave trips the breaker whenever I open the door. What does that mean?
This can indicate that one of the door switches has fused or welded its contacts shut from repeated electrical stress, so it continues carrying current when it shouldn't. This is a genuine safety concern and the affected switch should be replaced promptly rather than continuing to use the microwave.
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