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Introduction to the use of small power relays

Update:30-08-2019
Abst:

A power relay is a device that can make a transition in […]

A power relay is a device that can make a transition in one or more electrical output circuits when the input (or excitation) meets certain specified conditions, and can be used in a neutral point direct grounding system. Directional component for zero sequence current protection.

1. Rated operating voltage or rated operating current: This refers to the voltage or current required by the coil when operating at high power. The construction of one model is generally the same. In order to adapt to different voltage circuit applications, one type of model usually has a variety of rated operating voltages or rated operating currents, and is distinguished by specifications.

2. DC resistance: This refers to the DC resistance of the coil. In some product specifications, the rated operating voltage and DC resistance are given. In this case, the rated operating 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 determined.

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, in order to make the small high-power relays reliably pull in, the given voltage can be equal to or slightly higher than the rated working voltage. Generally do not exceed 1.5 times the rated working voltage. Otherwise the coil will be burnt.

4. Release current: It refers to the maximum current that the small high-power relay generates to release. 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-sized high-power relay returns to the state of no power-on, which is called the release action of the small-sized 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 contact of a small high-power relay. It determines how small and high power relays can control voltage and current. Small high-power relays with small contact loads cannot be used to control large currents or high voltages. For example, if the contact load of the Y3F small high-power relay is 0.02A × 12V, it cannot be used to control the circuit of the 220V.

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