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What are form A form B and form C contacts?

These are contact arrangements that can be found on switches and relays. The form designation is fairly old and rarely used now. Form A: a single, normally open contact that closes upon actuation. Form B: same as A, except in reverse. A normally closed contact that opens. Form C: A form A contact connected to a form B. The Form C contact has three wires, NO (normally open), NC (normally closed) and C (common). Upon actuation, the NO contact closes (continuity from NO-C) and the NC contact opens (no continuity from NC-C). It is more common now to see the following designations: Forms A and B can also be referred to as single pole-single throw: SPST-NO = Form A SPST-NC = Form B and Form C can be referred to as single pole-double throw: SPDT = Form C


Should there be voltage readings across a closed contact?

For all practical purposes NO. The only voltage measured will be the voltage drop of the contact itself. This should be very low if the contact is good.


How does an auxiliary contact work?

The auxiliary contact is to be utilized for interlocking of another relay or contactor or indication signal from another equipment.


Star delta control circuit diagram?

The Star-Delta control circuit diagram shows the delta contact and the main contact.


What causes contact chatter in electrical circuit?

Overload can cause contact chatter. Once the contact closes, the voltage in the circuit collapses and that causes the relay to drop out. At this pint the relay energizes, since the voltage is back. This cycle will continue on.

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What are form A form B and form C contacts?

These are contact arrangements that can be found on switches and relays. The form designation is fairly old and rarely used now. Form A: a single, normally open contact that closes upon actuation. Form B: same as A, except in reverse. A normally closed contact that opens. Form C: A form A contact connected to a form B. The Form C contact has three wires, NO (normally open), NC (normally closed) and C (common). Upon actuation, the NO contact closes (continuity from NO-C) and the NC contact opens (no continuity from NC-C). It is more common now to see the following designations: Forms A and B can also be referred to as single pole-single throw: SPST-NO = Form A SPST-NC = Form B and Form C can be referred to as single pole-double throw: SPDT = Form C


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