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Mounting
7.1
Mounting options
Mounting options for the 3RU21, 3RB30 and 3RB31
The 3RU2 thermal overload relays and the 3RB3 solid-state overload relays are matched
electrically and mechanically to 3RT2 contactors. As a result, direct mounting can be
achieved easily. Alternatively, the devices are suitable for stand-alone assembly.
7.2
Minimum clearances and mounting position
Minimum clearance
A minimum lateral clearance of > 6 mm must be maintained from live and grounded parts.
Mounting position for 3RU21 thermal overload relay
The diagrams below illustrate the permissible mounting positions for contactor mounting and
stand-alone assembly for 3RU21 thermal overload relays.
Table 7- 1
Permissible mounting positions for the 3RU21
Overload relay, stand-alone assembly
The set value is 1.1 times the motor current for a mounting position in the hatched area.
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002
Contactor + overload relay
7
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