Introducing the HONEYWELL 4HM49 Action Switch, a high-performance hermetically sealed snap action switch designed for demanding applications across aerospace, military, industrial, and harsh environments. Manufactured in the US, this switch offers exceptional durability, reliability, and versatility for critical control and sensing functions.
Product Features
Hermetically sealed with Symbol 5 enclosure, suitable for extreme environments including high altitude and deep space applications
Constructed with 300 series stainless steel housing for corrosion resistance and durability
Electrical ratings up to 4 A at 28 Vdc, with options for silver or gold contact materials for low or high power loads
Available with MIL-PRF-8805 qualification and UL 508 certification for industrial and military use
Wide operating temperature range from -184 °C to 260 °C (-300 °F to 500 °F), maintaining performance in extreme conditions
Mechanical endurance of at least 25,000 operations and electrical endurance of at least 25,000 operations
Compact size with minimal space requirements, ideal for space-constrained applications
Multiple actuator options including straight leaf, roller leaf, straight lever, and roller lever to expand functionality
Technical Specifications
Characteristic
Details
Description
Hermetic sealed miniature snap-action switch
Housing Material
300 series stainless steel
Mechanical Endurance
25,000 operations minimum
Electrical Endurance
25,000 operations minimum
Dielectric Voltage (initial)
1000 Vrms for 1 minute
Circuitry
SPDT
Contact Material
Silver, gold, or gold bifurcated
Electrical Rating
Up to 4 A at 28 Vdc
Sealing
Symbol 5 hermetic seal to MIL-PRF-8805
Temperature Range
-65 °C to 121 °C (standard); optional -184 °C to 260 °C
Vibration
Symbol 2 (15 g), 10 to 2000 Hz
Mechanical Shock
Shock type M (100 G, saw tooth)
Approvals
MIL-PRF-8805, UL 508 (File E66520)
Applications
Military aircraft and helicopters: landing gear, engine fuel valves, external hatches
{"id":10026154000701,"title":"4HM49","handle":"4hm49","description":"\u003ch3\u003eHONEYWELL 4HM49 Action Switches - Snap Action N.O. SP 1A\u003c\/h3\u003e\n\n\u003cp\u003eIntroducing the HONEYWELL 4HM49 Action Switch, a high-performance hermetically sealed snap action switch designed for demanding applications across aerospace, military, industrial, and harsh environments. Manufactured in the US, this switch offers exceptional durability, reliability, and versatility for critical control and sensing functions.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eHermetically sealed with Symbol 5 enclosure, suitable for extreme environments including high altitude and deep space applications\u003c\/li\u003e\n \u003cli\u003eConstructed with 300 series stainless steel housing for corrosion resistance and durability\u003c\/li\u003e\n \u003cli\u003eElectrical ratings up to 4 A at 28 Vdc, with options for silver or gold contact materials for low or high power loads\u003c\/li\u003e\n \u003cli\u003eAvailable with MIL-PRF-8805 qualification and UL 508 certification for industrial and military use\u003c\/li\u003e\n \u003cli\u003eWide operating temperature range from -184 °C to 260 °C (-300 °F to 500 °F), maintaining performance in extreme conditions\u003c\/li\u003e\n \u003cli\u003eMechanical endurance of at least 25,000 operations and electrical endurance of at least 25,000 operations\u003c\/li\u003e\n \u003cli\u003eCompact size with minimal space requirements, ideal for space-constrained applications\u003c\/li\u003e\n \u003cli\u003eMultiple actuator options including straight leaf, roller leaf, straight lever, and roller lever to expand functionality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\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 (initial)\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 gold bifurcated\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-65 °C to 121 °C (standard); optional -184 °C to 260 °C\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, saw tooth)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eApprovals\u003c\/td\u003e\n \u003ctd\u003eMIL-PRF-8805, UL 508 (File E66520)\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eMilitary aircraft and helicopters: landing gear, engine fuel valves, external hatches\u003c\/li\u003e\n \u003cli\u003eCommercial aircraft: landing gear, hatches, HVAC, oxygen valves\u003c\/li\u003e\n \u003cli\u003eSpacecraft: external hatch detection, engine fuel sensing\u003c\/li\u003e\n \u003cli\u003eIndustrial: pressure, temperature, and flow switches in power generation, oil, and gas sectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdditional Details\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003ePart Number: 4HM49\u003c\/li\u003e\n \u003cli\u003eManufacturer: HONEYWELL\u003c\/li\u003e\n \u003cli\u003eCountry of Origin: US\u003c\/li\u003e\n \u003cli\u003eUnit of Measure: EA\u003c\/li\u003e\n \u003cli\u003eECCN: EAR99\u003c\/li\u003e\n \u003cli\u003ePackage Type: Not specified\u003c\/li\u003e\n \u003cli\u003eDatasheet: \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\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Datasheet was not processed; please search the internet for the part number 4HM49 for more details.\u003c\/p\u003e\u003cbr\u003e","published_at":"2025-08-15T02:19:25+05:30","created_at":"2025-08-15T02:19:26+05:30","vendor":"Waldom Electonics","type":"Switches","tags":["1A","HWLL","IMPORT_CSV","Snap","SP","Switch","WLDM"],"price":17844007,"price_min":17844007,"price_max":17844007,"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":50621655253309,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"4HM49","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"4HM49","public_title":null,"options":["Default Title"],"price":17844007,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"4HM49","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/11921865.jpg?v=1755204566"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11921865.jpg?v=1755204566","options":["Title"],"media":[{"alt":null,"id":45844585218365,"position":1,"preview_image":{"aspect_ratio":0.835,"height":600,"width":501,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11921865.jpg?v=1755204566"},"aspect_ratio":0.835,"height":600,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11921865.jpg?v=1755204566","width":501}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eHONEYWELL 4HM49 Action Switches - Snap Action N.O. SP 1A\u003c\/h3\u003e\n\n\u003cp\u003eIntroducing the HONEYWELL 4HM49 Action Switch, a high-performance hermetically sealed snap action switch designed for demanding applications across aerospace, military, industrial, and harsh environments. Manufactured in the US, this switch offers exceptional durability, reliability, and versatility for critical control and sensing functions.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eHermetically sealed with Symbol 5 enclosure, suitable for extreme environments including high altitude and deep space applications\u003c\/li\u003e\n \u003cli\u003eConstructed with 300 series stainless steel housing for corrosion resistance and durability\u003c\/li\u003e\n \u003cli\u003eElectrical ratings up to 4 A at 28 Vdc, with options for silver or gold contact materials for low or high power loads\u003c\/li\u003e\n \u003cli\u003eAvailable with MIL-PRF-8805 qualification and UL 508 certification for industrial and military use\u003c\/li\u003e\n \u003cli\u003eWide operating temperature range from -184 °C to 260 °C (-300 °F to 500 °F), maintaining performance in extreme conditions\u003c\/li\u003e\n \u003cli\u003eMechanical endurance of at least 25,000 operations and electrical endurance of at least 25,000 operations\u003c\/li\u003e\n \u003cli\u003eCompact size with minimal space requirements, ideal for space-constrained applications\u003c\/li\u003e\n \u003cli\u003eMultiple actuator options including straight leaf, roller leaf, straight lever, and roller lever to expand functionality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\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 (initial)\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 gold bifurcated\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-65 °C to 121 °C (standard); optional -184 °C to 260 °C\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, saw tooth)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eApprovals\u003c\/td\u003e\n \u003ctd\u003eMIL-PRF-8805, UL 508 (File E66520)\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eMilitary aircraft and helicopters: landing gear, engine fuel valves, external hatches\u003c\/li\u003e\n \u003cli\u003eCommercial aircraft: landing gear, hatches, HVAC, oxygen valves\u003c\/li\u003e\n \u003cli\u003eSpacecraft: external hatch detection, engine fuel sensing\u003c\/li\u003e\n \u003cli\u003eIndustrial: pressure, temperature, and flow switches in power generation, oil, and gas sectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdditional Details\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003ePart Number: 4HM49\u003c\/li\u003e\n \u003cli\u003eManufacturer: HONEYWELL\u003c\/li\u003e\n \u003cli\u003eCountry of Origin: US\u003c\/li\u003e\n \u003cli\u003eUnit of Measure: EA\u003c\/li\u003e\n \u003cli\u003eECCN: EAR99\u003c\/li\u003e\n \u003cli\u003ePackage Type: Not specified\u003c\/li\u003e\n \u003cli\u003eDatasheet: \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\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Datasheet was not processed; please search the internet for the part number 4HM49 for more details.\u003c\/p\u003e\u003cbr\u003e"}
