Emergency Stop Switches / E-Stop Switches Emergency PB metal red turn no contact
Research Notes
1. What this is
XB4AB2 is a Schneider Electric Harmony XB4 complete 22mm pushbutton with chrome-plated METAL bezel and metal mounting collar (industrial IEC command switch).
2. Part-number decode
- Series: Harmony XB4
- Panel cutout: 22mm
- Bezel material: Metal
- Type: complete unit
3. Compatibility & ordering
Schneider's Harmony (22/16mm) and Square D Class 9001 (30mm) are the reference IEC/US command-switch ranges. This is a complete, pre-assembled device (operator + contact block). Match by size (16/22/30mm), bezel material (metal XB4/ZB4 vs plastic XB5/ZB5), function (pushbutton/selector/indicator/E-stop), colour, illumination, and contact arrangement; cross-reference to Allen-Bradley 800F/800T, Siemens 3SU, IDEC HW, or Eaton M22 by the same attributes if needed.
4. Data-quality note
The Schneider series, bezel material, size, and component type are decoded from the part number (grounded in the se.com Harmony catalog and distributor listings). The exact colour and contact arrangement are encoded in the remaining digits and depend on the sub-family — confirm against the Schneider datasheet for a precise order (not guessed here).
5. Sources
- Schneider Electric Harmony / Square D Class 9001 catalog (se.com)
- Distributor listing (Rexel / Mouser / Newark) — search the exact part number
1 source
- Schneider Electric — XB4AB2 — se.com
Especificações
|
Bezel material
|
metal
|
|
Component type
|
complete unit
|
|
Enriched by
|
schneider-decoder-2026-08-12
|
|
Lead time
|
11 Days
|
|
Manufacturer series
|
Harmony XB4
|
|
Mouser part number
|
996-XB4AB2
|
|
Panel cutout
|
22mm
|
|
Pn status
|
decoded
|
|
Wireless Range
Maximum wireless range in open air. Walls and interference reduce this significantly.
|
Harmony / Square D Class 9001
|
|
Rohs status
|
|
|
Series description
|
Schneider Harmony XB4 complete 22mm pushbutton with chrome-plated METAL bezel and metal mounting collar (industrial IEC command switch)
|
Referência rápida de instalação
Panel cutout: 22mm. Mount with the yellow backing plate visible (required by EN/ISO 13850).
Wiring: Wire NC contacts in series with the safety relay input channels. Use dual-channel wiring for SIL 3 / PLe applications. Never wire directly to a motor contactor.
Testing: Press the e-stop and verify the machine stops within the required time. Test the reset mechanism. Repeat monthly per EN/ISO 13850.
Dimensões
Solução de problemas
E-stop won't reset (twist/pull doesn't release)
Check for debris in the mechanism. For twist-release: turn clockwise 45-90 degrees. For push-pull: pull straight out firmly. If the mechanism is stuck, the internal latch may be damaged — replace the entire head assembly.
Machine doesn't stop when e-stop is pressed
Critical safety issue. Immediately lock out the machine. Check wiring — NC contacts must be in series with the safety relay. Verify the safety relay is functioning. A broken wire in an NC circuit should cause a stop, so check for a wiring bypass.
Safety relay faults after e-stop reset
The safety relay detects a cross-fault between the two monitoring channels. Check that both NC contacts on the e-stop are switching simultaneously. One contact may be welded closed — replace the contact block.
Especificações rápidas
- Bezel material
- metal
- Component type
- complete unit
- Enriched by
- schneider-decoder-2026-08-12
- Lead time
- 11 Days
- Manufacturer series
- Harmony XB4
