Restricted Breathing Enclosure EEx nR Class II Zone 2 ATEX Hazardous Areas

Restricted Breathing Enclosures

Restricted Breathing Enclosures

EEx nr Enclosures

Restricted Breathing Enclosures

EEx nR Class II Zone 2 ATEX Hazardous Areas

CE 0518 II 3 G EEx nR II T6

Restricted Breathing is a method of construction of enclosure such that the possibility of entry of a surroundingATEX explosive gas atmosphere is reduced to a low level.

The EEx nR enclosures are suitable for applications where there is a potential for hazardous areas in a Zone 2 classified location where explosive atmospheres are present in abnormal conditions only for short period (typically less than 10 hours per years).

The construction and power dissipation of the internal components of the restricted breathing enclosures is manufactured to include a very high level of sealing.

This limits the possible entry of flammable and potentially explosive gas or vapor in hazardous area locations.

The technique ensures the cumulative concentration within the enclosure does not exceed the Lower Explosive Limit for the gas or vapor concentration. This is the case even over a long period of time compared with the possible duration of the presence of gas or vapor in the external atmosphere.

EEx nR enclosures are designed and manufactured to suit the equipment being housed, and can include practical features such as windows, access plates, and operating devices. In order to ensure continued high integrity of the equipment, connections are normally made through factory sealed cables or cable bushes.

See also complete ranges of  ➡ Hazardous Area Enclosures | Zone 1 Enclosures | Zone 2 Enclosures | Ex d Flameproof Enclosures

EEx nr Enclosures

Features & Benefits

  • EEx nR enclosure design parameters have been approved by a Notified Body and meet the requirements of the harmonized European Standards EN 50014 and EN 50021
  • Unlimited EEx nR enclosure size and configuration
  • Restricted Breathing Enclosure must not be capable of changing the internal temperature in the enclosure by more than 10°C
  • ATEX Category 3 hazardous area certified with your equipment installed inside
  • Operator interfaces: keyboards, pointing devices, push buttons, lamps
  • 316L stainless steel construction (painted mild (carbon) steel optional)
  • All external fasteners in stainless steel
  • Access plates and viewing windows
  • Passive operation, no external electrical control system or air supply required
  • EEx nR enclosure is appropriately sized to ensure that this cannot occur based on the electrical and operational characteristics of the installed apparatus and the thermal characteristics of the enclosure design
Restricted Breathing Enclosures

Restricted Breathing Enclosures

Restricted Breathing Enclosure EEx nR

Enclosure Specification, Dimensions & Design

Height mm4508001800
Width mm450 60 1200
Depth mm150300800
Maximum Power W3075440
Approximate Weight Empty kg11.0027.00148.00
Typical ApplicationRemote TF monitorPC workstationSwitchgear rack

Restricted Breathing Enclosures


  • Housing material and finish: stainless Steel 316L, non-reflective orbital brush finish
  • Dimensions: Unlimited. The minimum enclosure size will be determined by the power dissipation of the equipment to be installed within the enclosure and the ability of the enclosure to maintain a maximum 10°C temperature rise
  • Configuration: Custom designed and built enclosures to suit each individual application. Sloping desk sections, access plates, windows, control devices, internal and external mounting methods may all be included to suit both the installed equipment and the hazardous area site conditions
  • Standards: BS EN 50021:1999 (EEx nR) Electrical Apparatus For Potentially Explosive Atmospheres
  • Type of Explosion Protection “n”
  • Hazardous Area ATEX Directive 94/9/EC (ATEX 100A)
  • Approval: Expo Technologies offer a Restricted Breathing Enclosure fitted with your apparatus that conforms to the requirements of the above referenced hazardous area standards and protection techniques. The EEx nR enclosure will have the specific approval code: CE 0518 UII 3G EEx nR II T6
  • Temperature: -20 to +40°C
  • Environmental Protection: Minimum IP65 (Ingress Protection)

EEx nr Enclosures

Design Options

  • Access plates on any face of the EEx nR enclosure
  • Polycarbonate viewing windows
  • Push buttons, lamps and indicators
  • Operator keyboards, full function QWERTY or numeric input only
  • Operator force mouse RS232/PS2 compatible
  • External electrical EEx e junction boxes for site connectors. These are utilised so that the integrity of the restricted breathing enclosure is not impaired
  • Internal equipment mounting: chassis plates, mounting bosses, 19″ rack mounts
  • External enclosure mounting: free standing, wall lugs, plinths, lifting eyes.

Typical Installed Apparatus

  • Displays: CRT’s, TFT’s, LCD’s, HMI’s electronic control modules, computers, PLC’s measurement instruments
  • Cameras
  • Radio / telecommunication devices

More Hazardous Area Products | Lighting | Plugs | Isolators | Control Panels | Junction BoxesMotor Starters

EEx nR Enclosures Restricted Breathing Enclosures Certifications

EEx nR Enclosures Restricted Breathing Enclosures Certifications

Exp Enclosures Hazardous Areas

EEx nR Enclosures Hazardous Areas | Ex pxEx pzDust ProtectedIncreased Safety | Restricted Breathing