Pushbutton Switches TW LED SQ PB
Research Notes
1. What this is
ALQW2B9920D-C-24V is an IDEC device — series not recognized.
2. Part-number decode
- Series: IDEC IDEC (series not recognized) — command switch
3. Compatibility & ordering
Panel cutout: **. Unibody construction — the operator and contact are a single assembly. Cross-reference by size, operation, contact arrangement, and color to an equivalent from another IEC command-switch line (Schneider Harmony, Allen-Bradley 800F/800T, Siemens 3SU, Eaton M22) if IDEC is unavailable.
4. Data-quality note
The exact IDEC series/configuration could not be confidently decoded from this part number. It is kept and documented (not deleted) and flagged needs-verification rather than guessed — if you have the datasheet or a distributor listing, that is the authoritative source.
5. Sources
- IDEC IDEC (series not recognized)-series datasheet / ordering guide (idec.com)
- IDEC USA catalog: https://us.idec.com (search the exact part number)
1 source
- IDEC USA catalog — ALQW2B9920D-C-24V — us.idec.com
Specifications
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Enriched by
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idec-decoder-2026-08-12
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Lead time
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0 Days
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Manufacturer series
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IDEC (series not recognized)
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Mouser part number
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199-ALQW2B9920DC24V
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Pn status
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needs-verification
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Rohs status
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Series description
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IDEC industrial command switch — the exact series/config could not be decoded from this part number; kept and flagged for verification rather than guessed
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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.
Quick Specs
- Enriched by
- idec-decoder-2026-08-12
- Lead time
- 0 Days
- Manufacturer series
- IDEC (series not recognized)
- Mouser part number
- 199-ALQW2B9920DC24V
- Pn status
- needs-verification