FXS Block Heaters Ex Zone 1

The FXS range of self-regulating enclosure heaters provide a bespoke solution tailored to suit your requirements. Unlike fixed duty heaters, FXS heaters do not require a thermostat to operate safely, due to their inbuilt ability to reduce the output as the temperature increases.


They can operate in ambient temperatures as high as 130°C (T4) or 180°C (T3) and down to -60°C, and are certified for use in hazardous areas where the atmosphere is classified as Zone 1 or 2


  • Hard anodised aluminium housing suitable for onshore and offshore applications
  • Can be directly mounted to the component that requires heating
  • Compact and efficient
  • Suitable for ambient temperatures as low as -60°C and up to +180°C –
  • Available in T3 and T4 temperature classes


  • Certification – ATEX II 2 G D Ex db IIC T4 to T3 Gb Ex tb IIIC T135°C to T200°C Db / IECEx Ex db IIC T4 to T3 Gb Ex tb IIIC T135°C to T200°C Db
  • Voltage – 100 to 140VAC or 200 to 265VAC
  • Output – Up to 1000W (subject to design, mounting and ambient conditions)
  • Ambient – -60 to +130°C: T4 heaters -60 to +180°C: T3 heaters T Class – T4 (135°C) or T3 (200°C)
  • Mounting – Directly bolted
  • Cabling – 3m standard (up to 10m available on request)
  • IP Rating – IP66 / IP68