User Manual

SIRIUS 3RU2/3RB3 overload relays
5.2 Product description
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
491
5.2.5 3RB30/3RB31 solid-state overload relays










1 Connection for contactor mounting:
In terms of their electrical and mechanical features and their design, these pins are perfectly
compatible with the contactors and soft starters for the direct mounting of overload relays. Stand-
alone assembly is also an option (in some cases in conjunction with a stand-alone assembly
module).
2 Switch position indicator and TEST function for wiring:
Indicates a trip and facilitates testing of the wiring.
3 RESET button
A device set to manual RESET can be reset locally by pressing the RESET button. On the 3RB31
an electronic remote RESET is integrated.
4 Tripping class setting/Internal ground-fault detection (3RB31 only):
This rotary switch is used to set the required tripping class dependent upon the starting conditions
and activate internal ground-fault detection.
5 Electronics test (device test):
Enables a test of all major device components and functions.
6 Control circuit terminal (removable):
A screw-type or spring-loaded system can be used to connect the control circuit terminal.
7 Main circuit terminal:
A screw-type or spring-loaded system can be used to connect the main circuit terminal.
8 Selector switch for manual/automatic RESET and RESET button:
The slide switch is used to choose between manual and automatic RESET. A device set to
manual RESET can be reset locally by pressing the RESET button. On the 3RB31 an electrical
remote RESET is integrated.
Information about the date of manufacture and product version appears below.
9 Motor current setting:
The large rotary button provides an easy means of setting the device to the rated motor current.
10 Label
Figure 5-2 Equipment, 3RB30/3RB31 overload relays
A sealable transparent cover can be optionally mounted (accessory). It stops the motor
setting being tampered with.