3RR2 current monitoring relays
4.4 3RR21 current monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
53
4.4
3RR21 current monitoring relays
4.4.1
Operator controls and connection terminals
Front view / terminal labeling (basic version)
Front view
Description
Position digits
①
Connection for contactor mounting or for stand-alone
assembly
②
Rotary button for setting the threshold for overshoot "I▲"
③
Rotary button for setting the threshold for undershoot "I▼"
④
Sliding switch "Memory" for selecting the reset response
parameter (manual/autoreset):
⑤
Control circuit terminal (removable):
The control circuit can be connected using either the
screw-type or the spring-loaded connection system.
⑥
Main circuit terminal (permanently connected) :
The main circuit can be connected using either the screw-
type or the spring-loaded connection system.
⑦
Label (below which there is a DATAMatrix code)
⑧
Device article number
⑨
Rotary button for startup delay time "onDel (s)"
⑩
Rotary button for tripping delay time "Del (s)"
⑪
Status display via "Ready" LEDs (green) for auxiliary
voltage and "Fault" (red) for switching state
Terminal labels
B1
Supply voltage ∼
/ +
B2
Supply voltage ∼
/ -
32
Output relay K1 changeover contact NC
contact
31
Output relay K1 changeover contact root
34
Output relay K1 changeover contact NO
contact
2/T1, 4/T2, 6/T3
Main circuit terminals
14 / 22
Feed-through contactor auxiliary switch (S00)
A2
Feed-through contactor coil terminal (S00)
You can find additional information on the connection terminals and the permissible
conductor cross-sections in the Chapter "Connection methods (Page 21)".
You can find information on connecting in the Chapter "Circuit diagrams (Page 59)".