In use, its contact action process can be divided into two parts: contact closing and contact opening, that is, the pull-in and release processes of the relay. They cycle to form a contact opening and closing phenomenon at a certain frequency. In the process of contact closure and opening, there are many special physical and chemical phenomena, such as contact resistance, contact jitter and arc.

1. Rated working voltage or rated working current: This refers to the voltage or current required by the coil during high-power operation. The construction of one model is generally the same. In order to adapt to the circuit application of different voltages, a large model usually has multiple rated operating voltages or rated operating currents, and is distinguished by specifications.

2. DC resistance: This refers to the DC resistance of the coil. Some product specifications give the rated working voltage and DC resistance. At this time, the rated working current can be obtained according to Ohm's law. If the rated operating current and DC resistance are known, the rated operating voltage can also be obtained.

3. Pull-in current: It refers to the minimum current that a small high-power relay can generate a pull-in action. In actual use, to make small high-power relays reliably attract, the given voltage can be equal to or slightly higher than the rated operating voltage. Generally not more than 1.5 times the rated working voltage. Otherwise it will burn the coil.

4. Release current: It refers to the maximum current that the small high-power relay produces in the release action. If the current of the small high-power relay in the pull-in state is reduced, when the current is reduced to a certain level, the small high-power relay returns to the state when it is not energized. This process is called the release action of the small high-power relay. The release current is much smaller than the pull-in current.

5. Load: It refers to the voltage or current allowed by the small high-power relay contacts. It determines the size of the small high-power relay that can control the voltage and current. In applications, small high-power relays with small contact loads cannot be used to control high current or high voltage.

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