- Off-delayed: Describes a delay in deactivation—after the control signal is removed, the device remains active for a set period before switching off.
- Off-delayed undervoltage release: A type of release mechanism that delays disconnection of a circuit after voltage drops below a specified threshold, allowing brief dips without interrupting power.
- Ohm’s Law: A fundamental principle of electricity stating that voltage (V) equals current (I) multiplied by resistance (R): V = I × R. Used in all aspects of circuit analysis.
- On-delayed: Describes a delay in activation—once the control signal is applied, the device waits for a set time before switching on.
- On-Off function: A basic binary switching operation that toggles a device or system between on (energized) and off (de-energized) states.
- Operating frequency: The standard frequency at which an electrical system operates, typically 50 Hz or 60 Hz depending on the region.
- Operating principle schematics: Diagrams illustrating how a device or system functions internally, helping explain mechanisms such as motor protection or switching behavior.
- Optical sensors: Sensors that detect objects or changes using light, typically through reflection or interruption of a beam. Commonly used for object presence detection or counting.
- Overcurrent protection of cables and conductors: Protection measures that prevent cables and wires from carrying more current than they are rated for, typically using fuses or circuit breakers.
- Overload motor-protective circuit-breaker: A specialized breaker that protects motors from excessive current over time (thermal overload) and sudden short circuits (magnetic protection).
- Overload protection
- Contactor: Thermal overload relays integrated with contactors to disconnect motors during sustained overcurrent.
- Electronic: Digital overload protection that uses sensors and programmable settings for precise motor safeguarding.
- Overload relay: A protective relay that disconnects the power supply to a motor when it draws excessive current beyond safe limits for a defined time.
- Overload relays
- Function (ZMT): Refers to specific functionalities, such as current monitoring and trip delay, in the ZMT type relays.
- In delta connection: A configuration where the relay is installed within the motor’s delta circuit, affecting its current sensing behavior.
- In motor circuit, in mains line: Indicates where the overload relay is placed—either in the motor leads or the main power line.
- Motor protection overload relay: A category of relays dedicated to safeguarding motors from overload damage.
- Time-delayed: Relays that delay tripping to allow harmless short-term current surges (e.g., during motor startup).
- Tripping: The action taken by the relay when the overload condition exceeds its threshold—cutting off power to the protected device.
- ZEB: A model or series of electronic overload relays with enhanced protection and programmability.
- ZEB, electronic: Denotes that ZEB relays operate digitally rather than mechanically.
- ZEB, Tripping characteristics: Details the specific current and time behavior that causes a ZEB relay to trip.
Published by Leonardo Tomás Cardillo
https://www.linkedin.com/in/leonardocardillo
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