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Glossary of Thermal-Link

  • Thermal-link
UL new name, also known as Thermal Cutoff or Thermal Fuse. Thermal-link is a non-resettable device incorporating a Thermal Element, which will open a circuit once only when exposed for a sufficient length of time to a temperature in excess of that which it has been designed.
  • Thermal Element
A metallic or non-metallic fusible material, that is part of a Thermal-link and is responsive to temperature by a change of state, such as solid to liquid at the temperature for which it is calibrated.
  • Rated Functioning Temperature(Tf)
The temperature of the Thermal-link, which causes it to change its state of conductivity with a detection current up to 10 mA as the only load.
  • Fuse Temperature(Fuse-Temp.)
The measured temperature when the Thermal Element is blown. The temperature is measured with silicone oil bath, of which temperature is increased at the rate of 0.5~1°C/min.
  • Holding Temperature(TH)
The Max. temperature of the Thermal-link at which it will not change its state of conductivity during 168 hours under the rated current.
  • Max. Temperature Limit(TM)
The Max. temperature at which the Thermal-link can maintain its mechanical and electrical properties without being impaired for 10mins.
  • Rated Current(Ir)
The current used to classify a Thermal-link, which is the Maximum current that the Thermal-link allows to carry and are able to cutoff the circuit in safety.
  • Rated Voltage(Ur)
The voltage used to classify a Thermal-link, which is the Maximum voltage that is allowed to apply to the circuit in which the Thermal-link is used.
  • Interrupting Current(Ib)
The Value of the current that the Thermal-link is capable of interrupting at rated voltage and under specified circuit conditions.
  • Transient Overload Current(Ip)
A direct current pulse train which the Thermal-link is able to withstand without impairing its characteristics.
  • Markings