SIEMENS
7/77
Siemens IC 10 · 2017
Overload Relays
General data
7
Connection methods
3RU2 thermal overload relays
•
Sizes S00 and S0:
- Main and auxiliary circuit: Either screw or spring-type
terminals
•
Sizes S2 and S3:
- Main circuit: Screw terminals with box terminal
- Auxiliary circuit: Either screw or spring-type terminals
3RB3 electronic overload relays
•
Sizes S00 and S0:
- Main and auxiliary circuit: Either screw or spring-type
terminals
•
Sizes S2 and S3:
- Main circuit: Screw terminals with box terminal or as
straight-through transformer
- Auxiliary circuit: Either screw or spring-type terminals
3RB2 electronic overload relays
3RB20 and 3RB21 overload relays:
•
Size S6:
- Main circuit: With busbar connection or as straight-through
transformer
- Auxiliary circuit: Either screw or spring-type terminals
•
Sizes S10/S12:
- Main circuit: With busbar connection
- Auxiliary circuit: Either screw or spring-type terminals
3RB22 to 3RB24 evaluation modules:
•
Screw or spring-type terminals
3RB29 current measuring modules:
•
Up to size S3: Straight-through transformers
•
As from size S6:
- Main circuit: With busbar connection
- Auxiliary circuit: Either screw or spring-type terminals
Screw terminals
Spring-type terminals
Busbar connections
Straight-through transformers
The various terminals and straight-through
transformers are indicated in the corresponding
tables by the symbols shown on orange
backgrounds.
© Siemens AG 2016