Cole Hersee M639BX Momentary Off Push-Button Switch – On / Momentary Off, SPST
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Cole Hersee M639BX Momentary Off Push-Button Switch – On / Momentary Off, SPST
A 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.
Key Features
- SPST configuration: Normally On / Momentary Off
- Spring return to On position when button is released
- Gasket-sealed case for moisture and dust protection
- Chrome-plated brass plunger
- Two brass screw terminals for secure wiring
- Mounting stem: 5/8"-32 diameter, 1" long
- Fits panels up to 3/4" thick
- Rated 10A @ 12VDC
Parts Desk Insights
Best use case: 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 Cole Hersee M485BP Momentary On Push-Button Switch. For a heavy-duty push-button rated at 35A, consider the Cole Hersee 90030BP Heavy-Duty Push-Button Switch. For a latching toggle alternative, see the Cole Hersee 558210BP Heavy Duty SPST Toggle Switch.
Specifications
- Switch type: SPST, Normally On / Momentary Off
- Positions: 2 (On / Momentary Off)
- Voltage rating: 10A @ 12VDC
- Plunger material: Chrome-plated brass
- Terminals: 2 brass screw terminals
- Mounting stem: 5/8"-32 diameter, 1" long
- Max panel thickness: 3/4"
- Part number: M639BX
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.