Product description
3.2 Versions
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
20 Manual, 09/2016, A5E03656507420A/RS-AB/003
Table 3- 3 3RB21 / 3RB31 electronic overload relays
Size Width Current range Rated operating
voltage U
e
Rated frequency Trip class
S00 45 mm 0.1 to 16 A 690 V AC 50/60 Hz CLASS 5E, 10E, 20E,
30E (adjustable)
S0 45 mm 0.1 to 40 A
S2 55 mm 12.5 to 80 A 690 V AC
Through-hole
technology: 1000
V AC
S3 70 mm 12.5 ... 115 A 1000 V AC
S6 120 mm 50 ... 200 A 690 V AC
S10 / S12 145 mm 55 ... 250 A to
160 ... 630 A
690 V AC
3RB30 / 3RB31 electronic 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, if increased
overload protection is required (wide setting ranges (1:4), for example, or even reduced
power loss and, as a result, minimized energy consumption).
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