Three-phase Monitoring Relays
| Type of product | Actuating voltage range* | Rated linear voltage, V | Number of contacts (m/c‑make contact, b/c‑break contact, ch‑o/c‑change-over contact) | Distinctive features |
|---|---|---|---|---|
| EL-11 EL-12 EL-13 |
single-phase reduction < 0,6Uph; single-phase increase > 1,3Uph; symmetrical increase > 1,2Uph; |
AC 100, 110, 220, 380, 400, 415 |
1 m/c 1 b/c |
Monitoring of existence and sequence of phases; protection against asymmetry, single-phase voltage reduction, “breakage” of one, two or three phases. |
| ЕL-М11-А ЕL-М12-А ЕL-М13-А |
2 ch-o/c | In addition to the series EL-11...EL-13: - Protection against "sticking" of two phases, phase voltage increase of one phase or symmetrically three phases; - Indication of existence and nature of the accident; - Adjustment of switch-on time and automatic restart; - Modular principle. |
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| ЕL-21 ЕL-21N |
Umin 180 V | AC 400 | 1 ch-o/c | Monitoring phase sequence and failure. Modular principle, compact units. |
| ЕL-22N | 160 - 376 V | AC 400 | 1 ch-o/c | Monitoring over/under voltage, phase sequence and failure. Modular principle, compact units. |
| ЕL-23 ЕL-23N |
48 - 480 V | AC 400 | 2 ch-o/c | Monitoring of 3-phase mains, voltage in 2 levels (undervoltage and overvoltage), phase asymmetry (can be switched off), phase sequence, phase failure, function of second relay (independent / parallel). 3-MODULE, DIN rail mounting. |
| ЕL-26 ЕL-26Н |
70 - 500 V | AC 100, 220 380, 400 |
2 ch-o/c | Monitoring of voltage, phases asymmetry, phases sequence, “breakage” of phases. Modular principle, compact units. |
| IN-10-2 | 0,15 мА, 45 В | AC/DC 170-250 | 1 ch-o/c | Three Phase Indicator untill 10 kV. |
* Relay actuating (switching of output contacts) takes place at single-phase voltage reduction (at Uph in two other phases) and at symmetrical phases voltages reduction as well.
Relay of Monitoring of Isolation and Pulsations
| Type of product | Actuating range* | Rated voltage, V | Number of contacts (m/c-make contact, b/c-break contact) | Distinctive features |
|---|---|---|---|---|
| ЕL-17 | resistance 5-50 / 20-200 kОm |
DC 110 220 |
1 m/c 1 b/c |
Isolation resistance value control for one of the buses to the “ground”. Switching time delay. |
| EL-18 | amplitude of pulsations 1-15 V |
110 220 |
1 m/c 1 b/c |
Pulsations level monitoring in the DC circuits. Switching time delay. |