• Bimetal is a composite metal with layer of different thermal expansion to provide a controlled deflection
when subjected to varying temperatures.
• Bimetals with additional layers to control electrical resistivity (trimetals) are available.
Anywhere excess temperature and current might cause bodily or property damages and requires
positive cut off.
• Circuit breakers
• Motor protectors
• Thermostats
• Car cigarette lighters
• Fan clutch
• Steam traps
• Glow starters for fluorescent lamp
• Fire alarms
• Water heaters
• Refrigerators
• Toasters
• Rice cookers
• Irons
• Hair dryers
• Thermometers
• Bimetals can be stamped, bent, curved or drawn as conventional alloys.
• BL(Bimetals for low temperature)
• BH(Bimetals for high temperature)
• TRC(Low temperature current carrying trimetals)
• THC(High temperature current carrying trimetals)
• BMS(Corrosion resistant bimetals)
• BM(Bimetals for medium temperature)
• BR(High sensitivity bimetals)
• TR(Medium temperature current carrying trimetals)
• BRC(High sensitive current carrying trimetals)
• Select the most suitable metal according to the required levels of temperature and deflection.
• The chart below shows the relationship between temperature and deflection of various bimetals.
The values were measured by fixing one end of each bimetal having a length of 1 mm and setting
its working length at 100 mm.