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3RU11, 3RB10, and 3RB12 overload relays
SIRIUS System Manual
4-2
GWA 4NEB 430 0999-02b
4.1 Specifications/regulations/approvals
Standards
• The 3RU11 thermal overload relays and the 3RB10 and 3RB12 electronic
overload relays comply with the following standards:
IEC 60947-1/DIN VDE 0660 Part 100
IEC 60947-4-1/DIN VDE 0660 Part 102
IEC 60947-5-1/DIN VDE 0660 Part 200
IEC 60801-2, -3, -4, -5; UL 508/CSA C 22.2.
• The 3RB10 and 3RB12 electronic overload relays also comply with the
EMC standards.
Tripping classes
The tripping classes describe time intervals within which the overload relays
have to trip from a cold state with 7.2 times the set current in the case of a
symmetrical, three-pole load. You will find the tripping classes in which the
3RU11, 3RB10, and 3RB12 overload relays are available in Section 4.2. The
following table indicates the tripping classes and tripping times in acc. with
the IEC 60947-4-1 standard:
Table 4-1: Tripping classes/tripping times
Time-delayed overload
release
The following table contains the operating limits of time-delayed overload
releases in the case of an all-pole load:
Table 4-2: Operating limits of time-delayed overload releases in the case of an all-pole load
Resistance to extreme
climates
The 3RU11, 3RB10, and 3RB12 overload relays are climate-proof in acc. with
IEC 721.
Shock protection
The 3RU11, 3RB10, and 3RB12 overload relays are shockproof in acc. with
DIN VDE 0106 Part 100.
Depending on assignment to other devices, extended terminal covers are to
be attached to the connecting bars.
Tripping class
Tripping time t
A
in sec at
7.2 x
I
e
from a cold state
10A
10
20
30
2 < T
A
≤
10
4 < T
A
≤
10
6 < T
A
≤
20
9 < T
A
≤
30
Overload
release type
Multiple of the set current
Reference
ambient tem-
perature
A
B
C
D
Ambient tem-
perature-com-
pensated
1.05
1.2
1.5
7.2
+ 20 °C
Not
tripped
< 2 h
Tripped
< 2 h
Tripped
< 4 min
Tripped from
a cold state
in 4 to 10
sec.
CLASS 10
< 2 h
< 2 h
< 8 min
6 to 20 sec
CLASS 20
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