What is a pointer relay?
Products are intended to inform about the reasons for blocking or de-energizing operational control schemes, in case parameters go beyond certain limits.
For example, a sudden inrush of current or voltage triggers a product that signals about what happened, with further disassembly of the operational circuit or a warning on the operator’s light panel. This is necessary so that the maintenance staff can quickly respond to an emergency situation and eliminate the causes.
The mechanism of the device is represented by a latch with a spring, which is forcibly cocked and fixed until the electromagnet trips. He, in turn, will release the latch with the spring, closing or opening the contacts and visually signaling to the personnel about the fact of operation.
Consider the principle of operation of the device on the example of the relay RU-21:
The indicative type of relay is used to signal emergency conditions in AC and DC networks. Also, the alarm system is used in circuits for measuring insulation, rated current, differential current and other parameters.
Wiring diagram for the organization of control of short circuit currents, through transformers TT:
We also recommend that you watch the video, which clearly shows what the RU-21 indicator relay consists of and how it works:
So we examined the principle of operation of the indicator relay, as well as the device and purpose. We hope the information provided was interesting to you!
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