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What is the difference between B and SB thermal units? Are they the same physical size?

B thermal units are Class 20 trip, the standard time delay characteristic for our melting alloy overload relays. The type SB thermal units are Class 30, which provides a longer time period before tripping under overload conditions. The B and SB thermal units are the same size, as is necessary due to the fact that they are both applied in the same overload relays.

CTA-ID : 2017415
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