ATEX & IECEx: Switch Disconnectors Regolus Ex
SQ & SE Series – Equipment for potentially explosive atmospheres.

| II 2D Ex tb IIIC T85°C Db | Zone 21-22 (Dust) | Tamb = -20°C /+55°C | IP65 |

ZONE 21, 22
The “Ex t” type of protection is based on the protection by an enclosure which is sealed to the penetration of dust and limits the surface temperature. The electrical components that could ignite an explosive atmosphere (high temperatures, sparks, etc.) are located inside enclosures with degree of protection IP6X; in Zone 22 with non-conductive dust the degree of protection IP5X is allowed.
Furthermore, the outer surface temperature of the equipment is kept below the maximum surface temperature T, in relation to the maximum tempera-ture for cloud TCL and layer Tl provided for in the installation site.
IP protection in accordance with IEC 60079-0 requirements.
New switch disconnectors Regolus Ex for command and emergency in aluminum box painted in Grey RAL 7035 and Yellow PANTONE 102C, suitable for use in ZONE 21 and 22 (Dust) with rated current of 25-32-40-63-80-100A.

Reference standards: EN 80079-34, EN 60947-3, EN 61241-0, EN60079-0, EN60079-31.
Directive: ATEX 2014/34/EU.

Zone 21: area in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur occasionally in normal operation.
Zone 22: area in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only.

Protection by enclosures (Ex “tb”).
Ex ta/tb/tc Da/Db/Dc II 1/2/3 D in accordance with IEC 60079-0; 60079-31.
The enclosure is sealed so tight, that no combustible dust can enter. The surface temperature of external enclosure is limited.


  • Minimum degree of protection in accordance with IEC/EN 60529 ≥ IP 6X.
  • Consideration of dust accumulating on the surface and reduction of permissible surface temperature with dust layer ≥ 5 mm are possible.

Various equipment where during normal operation sparks, electric arcs or hot surfaces occur and complex industrial designs (controllers) which by means of this type of protection can be utilized in the potentially explosive atmosphere.