ATEX

ATEX is an extremely important safety certification directive. Derived from the French term “ATmosphères EXplosibles,” it refers to the European Union directive governing equipment and protective systems intended for use in potentially explosive atmospheres.

A standard industrial brake may become an ignition source during operation through the following mechanisms:

Electrical sparks: Electrical sparks may be generated at the terminals of electromagnetic coils, switches, or internal circuits.
Mechanical sparks: Friction or impact between moving components may generate sparks.
High-temperature surfaces: Prolonged braking or high-frequency operation can elevate the brake’s surface temperature, potentially exceeding the auto-ignition point of surrounding explosive gases or dust.
Therefore, in hazardous areas containing flammable gases, vapors, mists, or combustible dust—such as chemical plants, oil rigs, mines, paint shops, and flour mills—ATEX-certified explosion-proof brakes must be used.

An ATEX-certified brake is specially designed and rigorously tested to ensure it cannot serve as an ignition source. Key features include:

Flameproof Enclosure (‘Ex d’): Electrical components capable of generating sparks (e.g., electromagnetic coils) are fully sealed within a robust enclosure. Even if an internal explosion occurs, the enclosure withstands pressure and prevents flame propagation to the external environment.
Temperature Class Control (‘T’ rating): The brake’s design and material selection ensure that even under worst-case operating conditions, its maximum surface temperature remains well below its certified T-class rating (e.g., T4 rating requires maximum surface temperature not exceeding 135°C), thereby preventing ignition of surrounding materials.
Dust Ignition Protection (Protection by Enclosure, ‘Ex t’): For dusty environments, the enclosure features a high degree of dust sealing (IP rating) to prevent combustible dust from entering the interior, while also controlling surface temperatures.