Temperature limiter for explosive gas atmospheres

Motors thermal protection, heat tracing, alarm and high temperature safety in explosive gas atmospheres.

Ingress protection

Mechanical protection

Housing raw material


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Motors thermal protection, heat tracing, alarm and high temperature safety in explosive gas atmospheres.

Main features

Classification: Ex mb IIC (Testing certificates: ATEX INERIS 15ATEX0018X and IECEx INE15.0022X).

Ambient temperature limits on enclosure : -40 to +150°C

Comply with the following standards:

  • EN 60079-0: 2012/A11:2013
  • IEC60079-0: 2011
  • EN 60079-18: 2009
  • IEC 60079-18: 2009
  • EN 60079-31: 2014
  • IEC 60079-31: 2013

Operating principle: bimetal disc crossed by the current, and whose shape change activates an electrical snap action contact.

Enclosure: Zamac, 31mm x 19mm x10mm. Ingress protection class IP65.

Mounting: by 2 holes dia.3mm

Set point: fixed factory set minimum 50°C maximum 150°C. (Calibration values are always zero current values).

Calibration tolerance: ± 5 ° C on the opening temperature (± 3 ° C on request)

Differential: fixed, not adjustable by the user. About 40°C at zero current.

Electrical rating: 9A 240VAC resistive, 3A, 240VAC inductive, 10,000 cycles. (13A resistive version is possible, consult us)

Current Sensitivity*: These devices are sensitive to the electrical intensity, and the cut-off temperature will be less than the nominal calibration temperature according to the table below:

Rating 3A 5A 7A 10A
Offset -2.5°C -5°C -10°C -20°C

Connection: by silicone insulated cable, 2 x 1 mm², O.D. 6.3mm. Withstands temperatures from -60 to + 180 ° C. The cable shall be protected, during installation, against shocks and risks of mechanical destruction. The cable must be fixed so that there is no risk of tearing it off the thermostat. The electrical connection must be made according to the specifications of the zone (EN 60079-0). In function of the ambient temperature on the cable, the intensity must be less than the values below:

Maximum ambient temperature on the cable:

Temperature 120°C 140°C 170°C
Intensity 12A 9A 5.4A

Cable length: Can be cut on demand. Standard lengths: 1m, 3m, 5m

Temperature calibration Trigger time
15A 20A 25A 30A 35A 40A
90 100s 30s 11s 5s 2.5s 1s
110 150s 40s 20s 8s 4s 2.5s
130 250s 80s 30s 12s 6.5s 4s
150 400s 150s 45s 18s 9s 6s


Short circuit trigging*: If an overcurrent occurs in the circuit, the thermostat contact will switch off automatically. The table below gives the response time in seconds of the thermostat according to its set point calibration and overcurrent.

Measurements made at an ambient temperature of 20°C.

*Indicative values, they may vary depending on the installation characteristics. If these values are critical in the application, we recommend performing validation tests.

Main references




Technical informations associated to this product

  • Electrical protection classes

    The housings are designed to protect electrical equipment located inside. This protection must be considered in the electrical and environmental angles.)
  • Temperature sensing principles

    The bimetal strip is formed by two co-laminated metal. One has a high coefficient of expansion, the othera lower or zero. When the strip is heated, it bends proportionally to the temperature. These bimetal blades are generally flat and fixed at one end. But they can be wound in a spiral shape, although this arrangement most often used in the construction of thermometers.
  • Historical foreword to explosion proof products

    The explosion of firedamp in mines caused by the flames of oil lamps, was the cause of many accidents and caused hundreds of deaths. This explosion had a double danger: methane gas and coal dust.
  • Technical foreword to explosion proof products and marking

    Electromechanical thermostats have an important characteristic that makes critical their use in potentially explosive atmospheres: the opening and closing of their electrical contact, which occurs regularly during their normal operation, produces a spark between the contacts.