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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.
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-10-1 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
ЕL-17А
resistance
5-50 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.