Coefficient of Thermal Expansion

Coefficient of Thermal Expansion is the rate of change of unit Length/Volume per unit degree change in temperature.
Material

Linear
Thermal Expansion
Coefficient at 20°C
x 10-6 / °C
Volumetric
Thermal Expansion
Coefficient at 20°C
x 10-6 / °C
Aluminium23 x 10-6 / °C69 x 10-6 / °C
Brass19 x 10-6 / °C57 x 10-6 / °C
Silver18 x 10-6 / °C54 x 10-6 / °C
Copper17 x 10-6 / °C51 x 10-6 / °C
Go14 x 10-6 / °C42 x 10-6 / °C
Steel13 x 10-6 / °C39 x 10-6 / °C
Iron12 x 10-6 / °C36 x 10-6 / °C
Glass9 x 10-6 / °C26 x 10-6 / °C
Coefficient of Linear Expansion
What is the thermal expansion of Aluminum/ Copper ?

Due to increase in Temperature Metals Expand, in Volume and Length through heat Transfer. It is Measured in linear expansion coefficient. Thermal Expansion of Metals like Aluminum / Copper is the fractional change in length / Volume of material-Al / Cu for each degree of temperature change.

What is Linear Thermal Expansion Coefficient?

Coefficient of linear Thermal expansion is the fractional change in length of Metals like Al, Cu, per degree change of Temperature.

What is Volumetric Thermal Expansion Coefficient?

Coefficient of Volumatic Thermal Expansion is the fractional change in Volume of Metals like Al, Cu, per degree change of Temperature.

DC Utilization Categories IEC 60947

Utilization Categories indicate the type of Load and Duty Cycle of the load basis which selection of Switchgear should be done for the intended application.

Let Through Energy

I2t – Let through Energy is available thermal energy resulting from Current Flow during circuit opening. I2t (of circuit breaker) < K2S2 (of cable)