Electrician Red Seal · Question
A two-wire control circuit for a contactor uses a normally open (NO) maintained pushbutton. When the pushbutton is pressed and released, the contactor energizes and remains energized. What additional component is required in the control circuit to de-energize the contactor?
To de-energize a continuously energized contactor in a two-wire maintained control circuit, a normally closed (NC) momentary pushbutton must be placed in series
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Question: A two-wire control circuit for a contactor uses a normally open (NO) maintained pushbutton. When the pushbutton is pressed and released, the contactor energizes and remains energized. What additional component is required in the control circuit to de-energize the contactor?
Answer options: ✅ A normally closed (NC) momentary pushbutton in series with the NO maintained pushbutton.
- A normally closed (NC) momentary pushbutton in parallel with the NO maintained pushbutton.
- A normally open (NO) momentary pushbutton in parallel with the contactor coil.
- A time-delay relay.
Correct answer: A normally closed (NC) momentary pushbutton in series with the NO maintained pushbutton.
Explanation: To de-energize a continuously energized contactor in a two-wire maintained control circuit, a normally closed (NC) momentary pushbutton must be placed in series with the current path to the contactor coil. Pressing this button will momentarily open the circuit, removing power from the coil and causing it to de-energize. The other options would not achieve this desired stopping action.
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