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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
S00
45 mm
0.11 to 16 A
S0
45 mm
1.8 to 40 A
S2
55 mm
11 to 80 A
Table 3- 2
3RB30 solid-state overload relays
Size
Width
Current range Rated operating power
S00
45 mm
0.1 to 16 A
S0
45 mm
0.1 to 40 A
S2
55 mm
12.5 to 80 A
Table 3- 3
3RB31 solid-state overload relays
Size
Width
Current range
S00
45 mm
0.1 to 16 A
S0
45 mm
0.1 to 40 A
S2
55 mm
12.5 to 80 A
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).
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002
Rated operating
for three-phase motors at
voltage U
400 V AC
0.04 to 7.5 kW
690 V AC
0.75 to 18.5 kW
5.5 to 37 kW
Rated operating
for three-phase motors at
voltage U
400 V AC
0.04 to 7.5 kW
690 V AC
0.04 to 18.5 kW
5.5 to 37 kW
Rated operating power
Rated operating
for three-phase motors at
voltage U
400 V AC
0.04 to 7.5 kW
690 V AC
0.04 to 18.5 kW
5.5 to 37 kW
Rated frequency
e
50/60 Hz
Rated frequency
e
50/60 Hz
Rated frequency
e
50/60 Hz
Product description
3.2 Versions
Trip class
CLASS 10
CLASS 10 or
CLASS 10A
Trip class
CLASS 10E or
20E (fixed)
Trip class
CLASS 5E, 10E,
20E, 30E
(adjustable)
21
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- 3Ru21 Thermal Overload Relays
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