Among the following contactor designations, which is typically used to denote a normally closed contactor?

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Multiple Choice

Among the following contactor designations, which is typically used to denote a normally closed contactor?

Explanation:
In this naming scheme, the letters on auxiliary contacts indicate their default state. The letter B is used for normally closed contacts, meaning the contact is closed when the coil is not energized and opens when the coil is energized. Seeing the same letter twice, as in BB, means there are two normally closed contacts in the block. So BB denotes two normally closed auxiliary contacts in the contactor. The other options would correspond to normally open or mixed configurations (AA would be two normally open contacts, AB would mix types, etc.), which is why BB is the designation that denotes a normally closed contactor.

In this naming scheme, the letters on auxiliary contacts indicate their default state. The letter B is used for normally closed contacts, meaning the contact is closed when the coil is not energized and opens when the coil is energized. Seeing the same letter twice, as in BB, means there are two normally closed contacts in the block. So BB denotes two normally closed auxiliary contacts in the contactor.

The other options would correspond to normally open or mixed configurations (AA would be two normally open contacts, AB would mix types, etc.), which is why BB is the designation that denotes a normally closed contactor.

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