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Series code: SQ

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Series details

Compact limit switch box, designed for hazardous areas, provides a visual and electrical remote position feedback on automated valves.

Available in 316 L stainless steel, the explosion proof enclosure matches the Ex d IIC T6 standards. The SQ switch box series offer a ready to mount solution thanks to the integrated Namur mounting kit.

The ideal compact solution for the Oil and Gas, both onshore and off shore, and Petrochemical industries.


  • Twin shaft design, ensuring a complete sealed device. The shaft is splitted in two parts, each fitted and sealed into the body and cover for the best weather insulation even during opening operation.
  • Integrated mounting kit for Namur actuators.
  • Two cable entries, either metrics or imperial.
  • 316 L stainless steel housing for the maximum protection in hostile and corrosive environments
  • Easy wiring through the terminal PCB board
  • NOVA™ V3 switch option ensures extreme durability and high power switching capabilities
  • Concentric flame path design providing a self-centering system aligning shafts for a precise engagement.
  • Captive bolts on the screwed lid.

Download the Soldo Product Overview brochure 

Product Description

Technical Data:


  • AISI 316 Stainless steel body and cover with electro-polished finishing
  • Stainless steel fasteners and shafts



Ex II 2GD  Ex d IIC T4/T5/T6 Gb

Ex tb IIIC T135/T100/T85°C Db

Ta:  -55°C≤Ta≤105°C/80°C/60°C


Class I Division1 Groups B,C,D  Division2 GroupsA,B,C,D

Class II Division1 Groups E,F,G Division2 Groups F,G

SIL certificate:

Up to SIL 3 certified by TUV

Protection rating:

IP 66 / 67

IP 66 / 68  up to 15 meters for 100 hours

Cable entries options:

Two cable entry M20 or 1/2" NPT


Standard operating temperature -20°C +80°C Lower and higher temperature options available on request.