Notes on the matters needing attention when using small high-power relays

Update:25-10-2021
Relays are commonly used devices in automatic control systems, used to connect and disconnect circuits to form automatic control and remote control circuits. Whether as the core component of the relay signal system, or the interface component of the electronic or computer signal system, it plays an important role. The same is true for power relays. Today we will analyze the matters needing attention when using small high-power relays.
1. Rated operating voltage or rated operating current: This refers to the voltage or current required by the coil during high-power operation. The structure of one model is roughly the same. In order to adapt to circuit applications of different voltages, one type of large usually has multiple rated operating voltages or rated operating currents, and they are distinguished by specifications.
2. DC resistance: This refers to the DC resistance of the coil. In some product manuals, the rated working voltage and DC resistance are given. At this time, the rated working current can be calculated according to Ohm's law. If the rated working current and DC resistance are known, the rated working voltage can also be obtained.
3. Pull-in current: It refers to the smallest current that a small high-power relay can produce a pull-in action. In actual use, in order to make small high-power relays reliable pull-in, the given voltage can be equal to or slightly higher than the rated working voltage. Generally, it should not be greater than 1.5 times the rated working voltage. Otherwise, the coil will be burnt.
4. Release current: It refers to the maximum current generated by the small high-power relay to release the 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 contacts of a small high-power relay. 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 large currents or high voltages. For example: the contact load of Y3F small high-power relay is 0.02A×12V, so it cannot be used to control the on-off of 220V circuit.
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