What is NO and NC on a contactor?
1 Answer
NO and NC stand for Normally Open and Normally Closed, respectively, and they refer to the positions of the contacts on a contactor or relay.
A contactor is an electrical switch that is typically used to control a high-power load, such as an electric motor or lighting system. It consists of a coil, which when energized, creates a magnetic field that pulls in a set of contacts, closing the circuit and allowing current to flow to the controlled load.
Here's what NO (Normally Open) and NC (Normally Closed) mean in the context of a contactor:
1. Normally Open (NO): In a NO contact, the circuit between the contact points is open (not conducting) when the coil of the contactor is not energized. When the coil is energized, the magnetic field pulls the contacts together, closing the circuit and allowing current to flow.
2. Normally Closed (NC): In a NC contact, the circuit between the contact points is closed (conducting) when the coil of the contactor is not energized. When the coil is energized, the magnetic field releases the contacts, opening the circuit and interrupting the current flow.
These NO and NC contacts are often used in combination to control the operation of a device or system. For example, you might use a NO contact to turn on a motor when a button is pressed and a NC contact to stop the motor when a safety switch is triggered.
In summary, NO contacts open when the coil is energized, while NC contacts close when the coil is energized. They provide flexibility in designing control systems for various applications.
A contactor is an electrical switch that is typically used to control a high-power load, such as an electric motor or lighting system. It consists of a coil, which when energized, creates a magnetic field that pulls in a set of contacts, closing the circuit and allowing current to flow to the controlled load.
Here's what NO (Normally Open) and NC (Normally Closed) mean in the context of a contactor:
1. Normally Open (NO): In a NO contact, the circuit between the contact points is open (not conducting) when the coil of the contactor is not energized. When the coil is energized, the magnetic field pulls the contacts together, closing the circuit and allowing current to flow.
2. Normally Closed (NC): In a NC contact, the circuit between the contact points is closed (conducting) when the coil of the contactor is not energized. When the coil is energized, the magnetic field releases the contacts, opening the circuit and interrupting the current flow.
These NO and NC contacts are often used in combination to control the operation of a device or system. For example, you might use a NO contact to turn on a motor when a button is pressed and a NC contact to stop the motor when a safety switch is triggered.
In summary, NO contacts open when the coil is energized, while NC contacts close when the coil is energized. They provide flexibility in designing control systems for various applications.