MP4-10R
Active22mm Red Mushroom Push Button 40mm
ABB 40mm red mushroom push button — momentary (not e-stop).
Common Applications
40mm red mushroom for non-latching stop applications. Unlike an e-stop (which latches), this springs back when released. Used for cycle stop and machine pause where immediate restart after release is acceptable.
Specifications
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Actuator Function
Momentary = springs back when released. Maintained/latching = stays pressed until pressed again.
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Momentary
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Actuator Type
The button head style. Flush sits level with the bezel (prevents accidental presses). Extended protrudes for easy access.
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Mushroom 40mm
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Certifications
Third-party safety certifications. UL = required for US NEC installations. CE = EU compliance. CSA = Canadian standards.
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UL, CSA, CE
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Color
Button/actuator color. Green = start/go, Red = stop/emergency, Yellow = caution, Blue = reset (per IEC 60204-1).
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Red
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Cutout Diameter
The hole size you drill in your panel to mount this button. 22mm is the most common industrial standard worldwide.
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22mm
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Installation Quick Reference
Panel cutout: 22mm. Insert from the front of the panel, secure with mounting nut from behind (tighten to 2-3 Nm).
Contact block: Snap or screw the contact block onto the rear of the button body. Ensure the contact block orientation matches the wiring diagram — NO terminals are usually marked.
Wiring: Use 0.5-2.5mm² stranded wire with ferrules. Tighten screw terminals to 0.8 Nm. Test the button function before energizing the circuit.
Dimensions
Troubleshooting
Button doesn't respond when pressed
Check the contact block first — it's the most common failure point. Test continuity across the NO or NC terminals with a multimeter. If no click is felt, the return spring in the head may be broken.
Works intermittently
Contact block contacts are pitted or burned. Replace the contact block — don't try to file the contacts. Check if the rated cycle count has been exceeded.
Button feels mushy or doesn't click
The spring return mechanism in the button head is worn. Replace the head. The contact block can usually be reused if it tests OK.
Where to Buy
Price range
$11.95 — $47.87
across 2 distributors
Quick Specs
- Actuator Function
- Momentary
- Actuator Type
- Mushroom 40mm
- Certifications
- UL, CSA, CE
- Color
- Red
- Cutout Diameter
- 22mm
What People Are Saying
“40mm red mushroom for non-latching stop applications. Unlike an e-stop (which latches), this springs back when released. Used for cycle stop and machine pause where immediate restart after release is ”