Answer Posted / v.govindarajulu

In Thermal Magnetic Release shortly known as TMD release
gives two types of Protection which are overload and short
circuit Protection, In termal Property ( ie metal gets
elongated when heating) is used to sense the overload (
over curent causes high heat in bimettalic strip). and
Magnetic Property (ie Magnectic Flux / induction) is used
to sense the short circuit.

note: short circuit protection needs quick trip than
overload trip thats why thermal trip is used for Overload
Protection And Magnetic Property is used for shortcircuit
Protection.


In Microprocessor release, sensing and triping executed by
Micrprocessor in gives the very faster response than TMD
Release. Normally Microprocessor based release gives LSI
Protection. ( G is Optional)

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