ZA2BS944
ActiveSchneider Electric ZA2BS944
Emergency Stop Switches / E-Stop Switches MUSHROOM/40MM RED T-T-R
Specifications
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Component type
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head/block (modular)
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Enriched by
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schneider-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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Harmony ZA2
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Mouser part number
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996-ZA2BS944
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Panel cutout
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22mm
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Pn status
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decoded-partial
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Wireless Range
Maximum wireless range in open air. Walls and interference reduce this significantly.
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Harmony / Square D Class 9001
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Rohs status
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Series description
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Schneider Harmony ZA2 (older generation) 22mm modular component (operator head / contact block)
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Installation Quick Reference
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.
Dimensions
Troubleshooting
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.
Quick Specs
- Component type
- head/block (modular)
- Enriched by
- schneider-decoder-2026-08-12
- Lead time
- 0 Days
- Manufacturer series
- Harmony ZA2
- Mouser part number
- 996-ZA2BS944
