1.Rated coil power: it refers to the power consumed by the coil when the coil are applied to the rated voltage. Generally for the DC relay, it is expressed in "W" while for the AC relay in "VA".
2.Rated voltage: it is the voltage applied to the coil that can make relay work normally. It is expressed in "V".
3.Pick up voltage: it is the voltage which closes the NO contacts when the relay is in the releasing state(for the latching relay in the reset state) and the coil voltage is increased gradually. Usually it is expressed in "V". It is usually the maximum value listed in the instructions, which is about 75% of rated voltage.
4.Release voltage: it is the voltage which closes the NC contacts when the relay is in the pick up state and the coil voltage is gradually reduced from the rated voltage. It is usually expressed in "V". The maximum value is listed in the instructions, which is about 10% of rated voltage.
5.Coil resistance: it generally refers to the DC resistance and is expressed in "Ω". In the catalogue the combination of the nominal value and tolerance is given.
6.Maximum voltage: it refers to the maximum voltage which relay coil could endure in a short period of time. It is expressed in "V".
