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Overview
Features
General data
Sizes
Seamless current range
Protection functions
Tripping in the event of overload
Tripping in the event of phase
unbalance
Tripping in the event of phase failure
Protection of single-phase loads
Tripping in the event of overheating
by
integrated thermistor motor
protection function
Tripping in the event of a ground fault
by
internal ground-fault detection
(activatable)
Features
RESET function
Remote RESET function
TEST function for auxiliary contacts
TEST function for electronics
Status display
Large current adjustment button
Integrated auxiliary contacts
(1 NO + 1 NC)
1) Motor currents up to 820 A can be recorded and evaluated by a current
measuring module, e. g. 3RB29 06-2BG1 (0.3 ... 3 A), in combination with
a 3UF18 68-3GA00 (820 A/1 A) series transformer.
2) The SIRIUS 3RN thermistor motor protection devices can be used to pro-
vide additional temperature-dependent protection.
Benefits
• Are coordinated with the dimensions, connections
and technical characteristics of the other devices
in the SIRIUS modular system (contactors, soft
starters, ...)
• Permit the mounting of slim and compact load fee-
ders in widths of 45 mm (S00), 45 mm (S0), 55 mm
(S2), 70 mm (S3), 120 mm (S6) and 145 mm
(S10/S12)
• Simplify configuration
• Allows easy and consistent configuration with one
series of overload relays (for small to large loads)
• Provides optimum inverse-time delayed protection
of loads against excessive temperature rises due
to overload
• Provides optimum inverse-time delayed protection
of loads against excessive temperature rises due
to phase unbalance
• Minimizes heating of induction motors during pha-
se failure
• Enables the protection of single-phase loads
• Provides optimum temperature-dependent pro-
tection of loads against excessive temperature ri-
ses, e. g. for stator-critical motors or in the event of
insufficient coolant flow, contamination of the mo-
tor surface or for long starting or braking opera-
tions
• Eliminates the need for additional special
equipment
• Saves space in the control cabinet
• Reduces wiring outlay and costs
• Provides optimum protection of loads against
high-resistance short-circuits or ground faults due
to moisture, condensed water, damage to the in-
sulation material, etc.
• Eliminates the need for additional special
equipment.
• Saves space in the control cabinet
• Reduces wiring outlay and costs
• Allows manual or automatic resetting of the relay
• Allows the remote resetting of the relay
• Allows easy checking of the function and wiring
• Allows checking of the electronics
• Displays the current operating state
• Makes it easier to set the relay exactly to the cor-
rect current value
• Allows the load to be switched off if necessary
• Can be used to output signals
Overload Relays
3RU11
3RB20/3RB21
S00 ...S3
S00 ... S12
0.11 ... 100 A
0.1 ... 630 A
✔
✔
✔
(✔)
✔
✔
✔
--
2)
2)
--
--
✔
--
(only 3RB21)
✔
✔
✔
✔
(by means of sepa-
(only 3RB21 with
rate module)
24 V DC)
✔
✔
✔
--
✔
✔
✔
✔
✔
✔
Siemens · 2011
General data
3RB22/3RB23
S00 ... S12
0.3 ... 630 A
1)
(... 820 A)
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
(2 ×)
3
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