Siemens SIRIUS 3RU2 - Versions

Product description
3.2 Versions
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002
21
3.2
Versions
Sizes, setting ranges, and device versions
The table below provides an overview of the various sizes in which 3RU21 thermal overload
relays and 3RB30/3RB31 solid-state overload relays are available. The maximum rated
currents, the minimum and maximum setting ranges, and the available tripping classes are
listed for each individual size.
Table 3- 1 3RU21 thermal overload relays
Size
Width
Current range
Rated operating power
for three-phase motors at
400 V AC
Rated operating
voltage U
e
Rated frequency
Trip class
S00 45 mm 0.11 to 16 A 0.04 to 7.5 kW 690 V AC 50/60 Hz CLASS 10
S0 45 mm 1.8 to 40 A 0.75 to 18.5 kW
S2 55 mm 11 to 80 A 5.5 to 37 kW CLASS 10 or
CLASS 10A
Table 3- 2 3RB30 solid-state overload relays
Size
Width
Current range
Rated operating power
for three-phase motors at
400 V AC
Rated operating
voltage U
e
Rated frequency
Trip class
S00 45 mm 0.1 to 16 A 0.04 to 7.5 kW 690 V AC 50/60 Hz CLASS 10E or
20E (fixed)
S0 45 mm 0.1 to 40 A 0.04 to 18.5 kW
S2 55 mm 12.5 to 80 A 5.5 to 37 kW
Table 3- 3 3RB31 solid-state overload relays
Size
Width
Current range
Rated operating power
for three-phase motors at
400 V AC
Rated operating
voltage U
e
Rated frequency
Trip class
S00 45 mm 0.1 to 16 A 0.04 to 7.5 kW 690 V AC 50/60 Hz CLASS 5E, 10E,
20E, 30E
(adjustable)
S0 45 mm 0.1 to 40 A 0.04 to 18.5 kW
S2 55 mm 12.5 to 80 A 5.5 to 37 kW
3RB30 / 3RB31 solid-state overload relays have approximately the same dimensions as
3RU21 thermal overload relays. As a result, the thermal overload relays can be replaced
easily with the electronic variant 3RB30/3RB31. This is necessary, for example, when lower
demands are placed on overload protection (wide setting ranges (1:4), for example, or even
reduced power loss and, as a result, minimized energy consumption).