JY-7 series DK type relay without auxiliary power supply voltage is used in relay protection devices for generators, transformers, and transmission lines as an overvoltage protection or low-voltage lockout starting element.
The specific characteristics are as follows:
1. Easy to set, using a three position dial switch to adjust the voltage value, intuitive and convenient, without the need for verification. Setting range: 19V~130V, 40V~260V or 200V~420V.
2. High precision, small step difference of 1V, and small error.
3. High reliability, no shaking, no refusal to move, fast action, high return coefficient.