{"product_id":"cole-hersee-m639bx-momentary-off-push-button-switch","title":"Cole Hersee M639BX Momentary Off Push-Button Switch – On \/ Momentary Off, SPST","description":"\u003ch2\u003eCole Hersee M639BX Momentary Off Push-Button Switch – On \/ Momentary Off, SPST\u003c\/h2\u003e\n\u003cp\u003eA precision-built momentary push-button switch designed for marine and automotive control panels. The M639BX is normally on — current flows continuously until the button is depressed, which momentarily interrupts the circuit and springs back to the on position when released. This normally-on, momentary-off action makes it ideal for applications where you need to briefly cut power or trigger a signal without latching off permanently.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSPST configuration: Normally On \/ Momentary Off\u003c\/li\u003e\n\u003cli\u003eSpring return to On position when button is released\u003c\/li\u003e\n\u003cli\u003eGasket-sealed case for moisture and dust protection\u003c\/li\u003e\n\u003cli\u003eChrome-plated brass plunger\u003c\/li\u003e\n\u003cli\u003eTwo brass screw terminals for secure wiring\u003c\/li\u003e\n\u003cli\u003eMounting stem: 5\/8\"-32 diameter, 1\" long\u003c\/li\u003e\n\u003cli\u003eFits panels up to 3\/4\" thick\u003c\/li\u003e\n\u003cli\u003eRated 10A @ 12VDC\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e The M639BX is the right switch when you need a normally-on circuit that can be momentarily interrupted — common applications include kill switches, alarm test circuits, and interlock controls where the default state is powered and a brief press cuts the signal. The chrome brass plunger and gasket seal make it a solid choice for helm panels and exposed locations. If you need the opposite action (normally off, momentary on), see the \u003ca href=\"\/products\/cole-hersee-m485bp-momentary-push-button-switch-off-momentary-on-spst\"\u003eCole Hersee M485BP Momentary On Push-Button Switch\u003c\/a\u003e. For a heavy-duty push-button rated at 35A, consider the \u003ca href=\"\/products\/cole-hersee-90030bp-heavy-duty-push-button-switch-plated-steel-housing-35a-12v\"\u003eCole Hersee 90030BP Heavy-Duty Push-Button Switch\u003c\/a\u003e. For a latching toggle alternative, see the \u003ca href=\"\/products\/cole-hersee-558210bp-heavy-duty-spst-toggle-switch\"\u003eCole Hersee 558210BP Heavy Duty SPST Toggle Switch\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSwitch type: SPST, Normally On \/ Momentary Off\u003c\/li\u003e\n\u003cli\u003ePositions: 2 (On \/ Momentary Off)\u003c\/li\u003e\n\u003cli\u003eVoltage rating: 10A @ 12VDC\u003c\/li\u003e\n\u003cli\u003ePlunger material: Chrome-plated brass\u003c\/li\u003e\n\u003cli\u003eTerminals: 2 brass screw terminals\u003c\/li\u003e\n\u003cli\u003eMounting stem: 5\/8\"-32 diameter, 1\" long\u003c\/li\u003e\n\u003cli\u003eMax panel thickness: 3\/4\"\u003c\/li\u003e\n\u003cli\u003ePart number: M639BX\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199415091236,"sku":"12-M639BX","price":46.29,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/12-M639.jpg?v=1785604986","url":"https:\/\/marisolmarine.com\/products\/cole-hersee-m639bx-momentary-off-push-button-switch","provider":"Marisol Marine Company","version":"1.0","type":"link"}