Catalogue (6.8 MB)

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Explosion-proof Rotary Limit Switch FRX

ATEX and IECEx approval for hazardous areas
  • ATEX Standards: EN 60079-0:2009, EN 60079-1:2007, EN 60079-31:2009
  • IECEx Standards: IEC 60079-0:2011, IEC 60079-1:2007-04, IEC 60079-31:2008
  • INERIS Certificate: 13ATEX0020X
  • IECEx Certificate: INE 13.0051X
  • Mining Class: I M2 Ex d I Mb (ATEX), Ex d I Mb (IECEx)
  • Gas and Dust Classes: II2GD Ex d IIB or IIC T6 Gb Ex tb IIC T85°C Db IP66
Opterating Temperature-40°C to+60°C
Protection DegreeIP 66
Housing MaterialG20 Cast Iron or Staineless Steel
Mechanical Lifetime1 million operations
Revolution Ratio1:15 ... 1:1578
Rated Current3A

The new ATEX approved rotary limit switch FRX is designed to control movement of industrial machinery in potentially explosive areas.


An explosive atmosphere is a mixture of air and gases, vapors, fumes or combustible powders, where combustion quickly propagates (explosion) after ignition at atmospheric pressure. 

The limit switch operates as an auxiliary controller of electrical motors through a power interface, such as a contactor or PLC.


The housing offers space for 2, 3 or 4 snap action switches with 1NO/1NC change-over contacts. All NC contacts are positive opening contacts for safety functions.


The ATEX- and IECEx-approved rotary limit switch FRX can be used with a maximum speed of 800 rotations per minute. 


Revolution ratios range from 1:15 to 1:1578 (standard ratios 1:20, 1:25, 1:50, 1:75, 1:100) and non standard revolution ratios are available on request. A worm gear and a helical toothed gear combined with one or more pairs of straight toothed gears are used for the transmission of the movement from the input shaft to the output shaft.Revolution ratios result from the use of different combinations of gear wheels between the input shaft and the output shaft, which is connected to the cams. 


The explosion-proof rotary limit switch FRX is available in following housing versions:

- G20 cast iron housing with foot mounting

- G20 cast iron housing with front flange mounting

- stainless steel housing with foot mounting

- stainless steel housing with front flange mounting


The special metal housing garantees a long lifetime and a protection degree of IP66. The rotary limit switch FRX is approved for the Gas Zone 1 and the Dust Zones 21 and 22.



- direct control switches to operate directly on the transmission

- special output shaft dimensions are available on request

- 5 different cams with different switching angles available


We would be glad to create your individual rotary limit switch in the desired configuration together with you. Please contact us by phone, e-mail or directly via our chat at the bottom right of this page. We are looking forward to your inquiry.