HW1B-M101R
ActiveHW Red Flush Push Button (1NC)
Red flush momentary push button, IDEC HW series. 22mm cutout, IP65, with 1NC contact.
Common Applications
Red stop button from the IDEC HW series. Paired with HW1B-M110G on cost-effective control panels. IDEC is a Japanese manufacturer offering good quality at competitive prices — popular with system integrators building panels for water/wastewater, building automation, and light industrial applications. The 1NC contact provides fail-safe stop function. IDEC also offers a complete range of complementary products (relays, timers, PLCs) that simplify single-vendor procurement.
Specifications
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Actuator Shape
The physical shape of the pressable surface.
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Round
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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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Flush
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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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Contact Configuration
Normally Closed — circuit is on until you press. Standard for stop/emergency functions. Wire in series with safety circuits.
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1NC
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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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IP Rating
IP65: Dust-tight and protected against low-pressure water jets. Suitable for indoor industrial and light washdown.
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IP65
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Material
The bezel/body material. Metal bezels are more durable in harsh environments. Plastic is lighter and cheaper.
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Plastic
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Mounting Type
How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.
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Panel
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Max Operating Temp
Highest temperature the button is rated to operate in.
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65°C
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Min Operating Temp
Lowest temperature the button is rated to operate in.
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-25°C
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Specs with this icon are linked to the manufacturer's original source page
Compatible Alternatives
These products are functionally equivalent cross-references from other manufacturers.
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
Wiring Diagram
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
$1.71 — $5.21
across 3 distributors
Quick Specs
- Actuator Shape
- Round
- Actuator Type
- Flush
- Certifications
- UL, CSA, CE
- Color
- Red
- Contact Configuration
- 1NC
What People Are Saying
“IDEC HW series is my go-to for small jobs. Cheaper than Omron A22 and the quality is comparable. The only time I reach for Omron is when the customer specifically requests it or the panel has other Omron components.”
Learn More
Data Sources
Specifications and product data sourced from the following references.
IDEC HW1B-M101R Product Page
https://us.idec.com/idec-us/en/USD/Pushbuttons/.../p/HW1B-M101R
Accessed March 29, 2026