XB4-BS8445
ActiveATEX Emergency Stop Twist Release
ATEX-certified 40mm mushroom emergency stop for hazardous areas.
Common Applications
Critical safety device on oil drilling platforms, gas compressor stations, and chemical reactors. ATEX Zone 1 certification ensures the e-stop itself cannot become an ignition source. Twist-to-release prevents accidental restart in hazardous environments.
Specifications
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Actuator Function
Momentary = springs back when released. Maintained/latching = stays pressed until pressed again.
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Twist-to-release
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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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ATEX Zone
The hazardous area classification. Zone 1 = gas likely present. Zone 2 = gas unlikely. Zone 21/22 = combustible dust.
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Zone 1, Zone 21
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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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ATEX, IECEx, 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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Explosion Group
The gas group the device is certified for. IIC covers hydrogen (most restrictive). IIB covers ethylene. IIA covers propane.
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IIC
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IP Rating
IP66: Dust-tight and withstands powerful water jets from any direction. Standard for outdoor and washdown applications.
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IP66
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Temperature Class
Maximum surface temperature. T6 (85°C) is most restrictive. T1 (450°C) is least. Must not exceed auto-ignition temp of the gas.
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T6
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You'll Also Need
This is a modular component. For a complete assembly, you may also need:
Compatible Alternatives
These products are functionally equivalent cross-references from other manufacturers.
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
Wiring Diagram
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.
Where to Buy
Price range
$22.0 — $50.9
across 3 distributors
Quick Specs
- Actuator Function
- Twist-to-release
- Actuator Type
- Mushroom 40mm
- ATEX Zone
- Zone 1, Zone 21
- Certifications
- ATEX, IECEx, CE
- Color
- Red
