What is defined as the voltage at which the armature begins to release from the stationary core?

The term defined as the voltage at which the armature begins to release from the stationary core is known as the Dropout Voltage. This is a key concept in understanding electromagnetic systems, where the armature is a component that moves in response to electromagnetic forces.

When the voltage applied to an electromagnetic coil falls below the Dropout Voltage, the electromagnetic force is no longer sufficient to hold the armature in its engaged position, causing it to release. This threshold is crucial for the proper functioning of devices that rely on electromagnetic actuation, ensuring they disengage at the correct voltage level, which may be necessary for safety or operational reasons.

In contrast, Pickup Voltage refers to the voltage needed to initially engage or pull in the armature. Seal-in Voltage is a specific term for the voltage that needs to be maintained in order for a circuit to stay in a latched position after being actuated. Nominal Voltage is simply a standard reference voltage that represents the typical operating conditions but does not pertain directly to the mechanism of engaging or disengaging the armature.