EX Proof ATEX Switches

ATEX and explosion-proof safety switches monitor conveyor and machine safety functions where an explosive atmosphere may occur. The KBT range includes Ex versions for belt misalignment, pull cord emergency stop and position detection. A product must not be chosen by its name alone: zone classification, gas or dust group, temperature class, ingress protection and contact requirements must all match the installation.

Before selection, obtain the site classification and verify the complete certificate and Ex marking against the intended mounting point. Final suitability should be confirmed from the current product documentation.

Technical specifications and procurement documents commonly use “ATEX safety switch”, “explosion-proof limit switch”, “Ex conveyor switch”, “hazardous-area safety switch” and “ATEX limit switch”. Depending on the region and the monitored function, “explosion proof conveyor switch”, “hazardous area limit switch”, “Ex d limit switch” and “flameproof switch” may also appear. These expressions overlap, but they do not make two devices interchangeable without checking actuator geometry, contacts, environmental limits and certification.

Relevant KBT product families on this category page include TPR22-BM-EX, NSR22-BM-EX, NSR66-BM-EX and TPR22-PR-EX. The model code identifies a product family; the exact actuator, contact arrangement, enclosure and certification must be confirmed from the selected version.

Selection must start with actual site data rather than a model name. Record Zone classification, Gas or combustible-dust group, Temperature class and permitted surface temperature, IP protection and ambient conditions and Safety function and contact arrangement. Compare the shortlist with the current data sheet, dimensional drawing, certificate and control architecture; do not infer an unknown rating from a similar enclosure.

• Zone classification
• Gas or combustible-dust group
• Temperature class and permitted surface temperature
• IP protection and ambient conditions
• Safety function and contact arrangement

Exact limits, contact ratings and certification markings must be verified in the current product data sheet before ordering or commissioning. This verification applies specifically to the selected ATEX safety switch configuration.

Before installation, compare equipment category, EPL, gas or dust group, temperature class and ambient range with the certificate. Cable glands, stopping plugs, earthing and seals must suit the protection concept; do not drill or modify the enclosure. The commissioning record should capture the product marking, certificate, installation zone and initial function test.

Applicable to classified conveyor, chute and machinery areas in mining, cement, grain, fertiliser, chemical and power plants.

The ATEX safety switch is a field device within a wider machine-control or safety function. Contact arrangement, PLC input, relay logic, alarm stage, stop stage and restart permission must be defined from the risk assessment. A contact change at the device is not sufficient proof: commissioning must confirm that the intended alarm or safe stop occurs at the machine.

Share the zone, gas/dust group, temperature class and contact requirement; we will help verify the suitable certified model.

Inspect enclosure, cover, seals, cable entries and earth continuity at scheduled intervals. Cracks, corrosion, loose covers or an incorrect gland can compromise explosion protection. Qualified personnel should maintain the device to the current certificate and manufacturer instructions, documenting compatible replacement parts.