① Rated Operating Voltage: Refers to the voltage required by the relay coil for normal operation. Depending on the specific relay model, this may be either an AC or a DC voltage.
② DC Resistance: Refers to the DC resistance of the relay coil, which can be measured using a multimeter.
③ Pickup Current: Refers to the minimum current required to trigger the relay's pickup (actuation) action. During normal operation, the applied current must be slightly higher than the pickup current to ensure stable relay performance. However, the operating voltage applied to the coil should generally not exceed 1.5 times the rated operating voltage; doing so would generate excessive current, potentially burning out the coil.
④ Dropout Current: Refers to the maximum current at which the relay performs its dropout (release) action. When the current flowing through the relay in its energized state decreases to a certain level, the relay reverts to its de-energized (released) state; at this point, the current is significantly lower than the pickup current.
⑤ Contact Switching Voltage and Current: Refers to the maximum voltage and current that the relay contacts are permitted to handle. These specifications determine the magnitude of the voltage and current that the relay can control; these limits must not be exceeded during operation, as doing so would easily damage the relay contacts.
