The HONEYWELL 18HM49 is a high-performance hermetic sealed micro switch designed for demanding applications across aerospace, military, marine, and industrial environments. Manufactured in the US, this switch offers exceptional durability and reliability in harsh conditions, making it ideal for critical control and sensing functions.
Product Features
Type: Snap action, Single Pole Double Throw (SPDT)
Contact Material: Silver, gold, or bifurcated gold contacts for versatile switching capabilities
Electrical Rating: Up to 4 A at 28 VDC; suitable for low and high power loads
Sealing: Hermetically sealed to MIL-PRF-8805 with Symbol 5 enclosure, ensuring protection against dust, water, and corrosive gases
Housing Material: 300 series stainless steel for corrosion resistance
Temperature Range: -184 °C to 260 °C [-300 °F to 500 °F], with stable operation over wide temperature variations
Mechanical Endurance: Minimum of 25,000 operations
Electrical Endurance: Minimum of 25,000 operations
Vibration & Shock Resistance: Designed to withstand 15 g vibration and 100 G shock
Approvals: MIL-PRF-8805 qualified; UL 508 certified (select versions)
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{"id":10027779129661,"title":"18HM49","handle":"18hm49","description":"\u003ch3\u003eHONEYWELL 18HM49 Switches N.O.SP 1A 28VDC Snap Action\u003c\/h3\u003e\n\n\u003cp\u003eThe HONEYWELL 18HM49 is a high-performance hermetic sealed micro switch designed for demanding applications across aerospace, military, marine, and industrial environments. Manufactured in the US, this switch offers exceptional durability and reliability in harsh conditions, making it ideal for critical control and sensing functions.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Snap action, Single Pole Double Throw (SPDT)\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eContact Material:\u003c\/strong\u003e Silver, gold, or bifurcated gold contacts for versatile switching capabilities\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e Up to 4 A at 28 VDC; suitable for low and high power loads\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSealing:\u003c\/strong\u003e Hermetically sealed to MIL-PRF-8805 with Symbol 5 enclosure, ensuring protection against dust, water, and corrosive gases\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e 300 series stainless steel for corrosion resistance\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -184 °C to 260 °C [-300 °F to 500 °F], with stable operation over wide temperature variations\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMechanical Endurance:\u003c\/strong\u003e Minimum of 25,000 operations\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eElectrical Endurance:\u003c\/strong\u003e Minimum of 25,000 operations\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eVibration \u0026amp; Shock Resistance:\u003c\/strong\u003e Designed to withstand 15 g vibration and 100 G shock\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e MIL-PRF-8805 qualified; UL 508 certified (select versions)\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e EA (each)\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eECCN:\u003c\/strong\u003e EAR99\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e US\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18HM49\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e HONEYWELL\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDatasheet:\u003c\/strong\u003e \u003ca href=\"https:\/\/prod-edam.honeywell.com\/content\/dam\/honeywell-edam\/sps\/siot\/en-us\/products\/switches\/sealed-switches\/hm-series\/documents\/sps-siot-micro-switch-hm-hermetic-basic-product-sheet-003123-2-en-ciid-154705.pdf\" target=\"_blank\"\u003eDownload Datasheet\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eMilitary and commercial aircraft for detecting landing gear, engine fuel valves, and external hatches\u003c\/li\u003e\n \u003cli\u003eSpacecraft for external hatch and door position sensing\u003c\/li\u003e\n \u003cli\u003eMarine and harsh industrial environments requiring hermetic sealing\u003c\/li\u003e\n \u003cli\u003ePower generation, oil, and gas equipment for pressure, temperature, and flow sensing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n \u003cth\u003eCharacteristic\u003c\/th\u003e\n \u003cth\u003eDetails\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eDescription\u003c\/td\u003e\n \u003ctd\u003eHermetic sealed miniature snap-action switch\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eHousing Material\u003c\/td\u003e\n \u003ctd\u003e300 series stainless steel\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMechanical Endurance\u003c\/td\u003e\n \u003ctd\u003e25,000 operations minimum\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eElectrical Endurance\u003c\/td\u003e\n \u003ctd\u003e25,000 operations minimum\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eDielectric Voltage\u003c\/td\u003e\n \u003ctd\u003e1000 Vrms for 1 minute\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eCircuitry\u003c\/td\u003e\n \u003ctd\u003eSPDT\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eContact Material\u003c\/td\u003e\n \u003ctd\u003eSilver, gold, or bifurcated gold contacts\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eElectrical Rating\u003c\/td\u003e\n \u003ctd\u003eUp to 4 A at 28 VDC\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSealing\u003c\/td\u003e\n \u003ctd\u003eSymbol 5 hermetic seal to MIL-PRF-8805\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eTemperature Range\u003c\/td\u003e\n \u003ctd\u003e-184 °C to 260 °C [-300 °F to 500 °F]\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eVibration\u003c\/td\u003e\n \u003ctd\u003eSymbol 2 (15 g), 10 to 2000 Hz\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMechanical Shock\u003c\/td\u003e\n \u003ctd\u003eShock type M (100 G, sawtooth)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eApprovals\u003c\/td\u003e\n \u003ctd\u003eMIL-PRF-8805, UL 508 (select versions)\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eFor more detailed specifications and customization options, please refer to the \u003ca href=\"https:\/\/prod-edam.honeywell.com\/content\/dam\/honeywell-edam\/sps\/siot\/en-us\/products\/switches\/sealed-switches\/hm-series\/documents\/sps-siot-micro-switch-hm-hermetic-basic-product-sheet-003123-2-en-ciid-154705.pdf\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Datasheet was not processed; please search the internet for the part number 18HM49 for additional details.\u003c\/em\u003e\u003c\/p\u003e\u003cbr\u003e","published_at":"2025-08-16T02:56:50+05:30","created_at":"2025-08-16T02:56:50+05:30","vendor":"Waldom Electonics","type":"Switches","tags":["1A","28VDC","HWLL","IMPORT_CSV","IMPORT_PT2","Snap","SP","Switch","WLDM"],"price":7607399,"price_min":7607399,"price_max":7607399,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":50626068742461,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"18HM49","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"18HM49","public_title":null,"options":["Default Title"],"price":7607399,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"18HM49","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/11914096.jpg?v=1755293212"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11914096.jpg?v=1755293212","options":["Title"],"media":[{"alt":null,"id":45860624662845,"position":1,"preview_image":{"aspect_ratio":1.824,"height":329,"width":600,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11914096.jpg?v=1755293212"},"aspect_ratio":1.824,"height":329,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11914096.jpg?v=1755293212","width":600}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eHONEYWELL 18HM49 Switches N.O.SP 1A 28VDC Snap Action\u003c\/h3\u003e\n\n\u003cp\u003eThe HONEYWELL 18HM49 is a high-performance hermetic sealed micro switch designed for demanding applications across aerospace, military, marine, and industrial environments. Manufactured in the US, this switch offers exceptional durability and reliability in harsh conditions, making it ideal for critical control and sensing functions.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Snap action, Single Pole Double Throw (SPDT)\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eContact Material:\u003c\/strong\u003e Silver, gold, or bifurcated gold contacts for versatile switching capabilities\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e Up to 4 A at 28 VDC; suitable for low and high power loads\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSealing:\u003c\/strong\u003e Hermetically sealed to MIL-PRF-8805 with Symbol 5 enclosure, ensuring protection against dust, water, and corrosive gases\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e 300 series stainless steel for corrosion resistance\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -184 °C to 260 °C [-300 °F to 500 °F], with stable operation over wide temperature variations\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMechanical Endurance:\u003c\/strong\u003e Minimum of 25,000 operations\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eElectrical Endurance:\u003c\/strong\u003e Minimum of 25,000 operations\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eVibration \u0026amp; Shock Resistance:\u003c\/strong\u003e Designed to withstand 15 g vibration and 100 G shock\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e MIL-PRF-8805 qualified; UL 508 certified (select versions)\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e EA (each)\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eECCN:\u003c\/strong\u003e EAR99\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e US\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18HM49\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e HONEYWELL\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDatasheet:\u003c\/strong\u003e \u003ca href=\"https:\/\/prod-edam.honeywell.com\/content\/dam\/honeywell-edam\/sps\/siot\/en-us\/products\/switches\/sealed-switches\/hm-series\/documents\/sps-siot-micro-switch-hm-hermetic-basic-product-sheet-003123-2-en-ciid-154705.pdf\" target=\"_blank\"\u003eDownload Datasheet\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eMilitary and commercial aircraft for detecting landing gear, engine fuel valves, and external hatches\u003c\/li\u003e\n \u003cli\u003eSpacecraft for external hatch and door position sensing\u003c\/li\u003e\n \u003cli\u003eMarine and harsh industrial environments requiring hermetic sealing\u003c\/li\u003e\n \u003cli\u003ePower generation, oil, and gas equipment for pressure, temperature, and flow sensing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n \u003cth\u003eCharacteristic\u003c\/th\u003e\n \u003cth\u003eDetails\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eDescription\u003c\/td\u003e\n \u003ctd\u003eHermetic sealed miniature snap-action switch\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eHousing Material\u003c\/td\u003e\n \u003ctd\u003e300 series stainless steel\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMechanical Endurance\u003c\/td\u003e\n \u003ctd\u003e25,000 operations minimum\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eElectrical Endurance\u003c\/td\u003e\n \u003ctd\u003e25,000 operations minimum\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eDielectric Voltage\u003c\/td\u003e\n \u003ctd\u003e1000 Vrms for 1 minute\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eCircuitry\u003c\/td\u003e\n \u003ctd\u003eSPDT\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eContact Material\u003c\/td\u003e\n \u003ctd\u003eSilver, gold, or bifurcated gold contacts\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eElectrical Rating\u003c\/td\u003e\n \u003ctd\u003eUp to 4 A at 28 VDC\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSealing\u003c\/td\u003e\n \u003ctd\u003eSymbol 5 hermetic seal to MIL-PRF-8805\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eTemperature Range\u003c\/td\u003e\n \u003ctd\u003e-184 °C to 260 °C [-300 °F to 500 °F]\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eVibration\u003c\/td\u003e\n \u003ctd\u003eSymbol 2 (15 g), 10 to 2000 Hz\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMechanical Shock\u003c\/td\u003e\n \u003ctd\u003eShock type M (100 G, sawtooth)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eApprovals\u003c\/td\u003e\n \u003ctd\u003eMIL-PRF-8805, UL 508 (select versions)\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eFor more detailed specifications and customization options, please refer to the \u003ca href=\"https:\/\/prod-edam.honeywell.com\/content\/dam\/honeywell-edam\/sps\/siot\/en-us\/products\/switches\/sealed-switches\/hm-series\/documents\/sps-siot-micro-switch-hm-hermetic-basic-product-sheet-003123-2-en-ciid-154705.pdf\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Datasheet was not processed; please search the internet for the part number 18HM49 for additional details.\u003c\/em\u003e\u003c\/p\u003e\u003cbr\u003e"}
