SIEMENS
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Siemens IC 10 · 2017
Overload Relays
General data
7
■
Overview
✓
Available
--
Not available
1)
Motor currents up to 820 A can be recorded and evaluated by a current
measuring module, e.g. 3RB2906-2BG1 (0.3 to 3 A), in combination with a
3UF1868-3GA00 (820 A/1 A) series transformer.
For 3UF18 transformers
see page 10/22
.
2)
The SIRIUS 3RN thermistor motor protection devices can be used to
provide additional temperature-dependent protection.
More information
Home page,
Industry Mall,
see
•
www.siemens.com/product?3RU2
•
www.siemens.com/product?3RB3
•
www.siemens.com/product?3RB2
Configuration Manuals,
see
•
"SIRIUS Configuration – Selection Data for Fuseless Load Feeders",
•
"Configuring SIRIUS Innovations – Selection Data for Fuseless and Fused
Load Feeders",
Features
3RU21
3RB30/3RB31
3RB20/3RB21
3RB22/3RB23
3RB24
Benefits
General data
Sizes
S00 ... S3
S00 ... S3
S6 ... S12
S00 ... S12
S00 ... S12
• Are coordinated with the dimensions,
connections and technical characteristics
of the other devices in the SIRIUS modular
system (contactors, etc., ...)
• Permit the mounting of slim and compact
load feeders in widths of 45 mm (S00, S0),
55 mm (S2), 70 mm (S3), 120 mm (S6) and
145
mm (S10/S12); this does not include the
current measuring modules for the 3RB22 to
3RB24 evaluation modules sizes S00 to S3
• Simplify configuration
Seamless current
range
0.11 ... 100 A
0.1 ... 115 A
50 ... 630 A
0.3 ... 630 A
(up to 820 A)
1)
0.3 ... 630 A
(up to 820 A)
1)
• Allows easy and consistent configuration
with one series of overload relays (for small
to large loads)
Protection functions
Tripping due to
overload
✓
✓
✓
✓
✓
• Provides optimum inverse-time delayed
protection of loads against excessive
temperature rises due to overload
Tripping due to
phase asymmetry
✓
✓
✓
✓
✓
• Provides optimum inverse-time delayed
protection of loads against excessive
temperature rises due to phase asymmetry
Tripping due to
phase failure
✓
✓
✓
✓
✓
• Minimizes heating of three-phase motors
during phase failure
Protection of
single-phase loads
✓
--
--
✓
✓
• Enables the protection of single-phase
loads
Tripping due to
overtemperature
by
integrated
thermistor motor
protection function
--
2)
--
2)
--
2)
✓
✓
• Provides optimum temperature-dependent
protection of loads against excessive
temperature rises, e.g. for stator-critical
motors or in the event of insufficient coolant
flow, contamination of the motor surface or
long starting or braking operations
• Eliminates the need for additional special
equipment
• Saves space in the control cabinet
• Reduces wiring outlay and costs
Tripping due to
ground fault
by
internal ground-fault
detection (can be
activated)
--
✓
(only 3RB31)
✓
(only 3RB21)
✓
✓
• Provides optimum protection of loads
against high-resistance short circuits or
ground faults due to moisture, condensed
water, damage to the insulation material,
etc.
• Eliminates the need for additional special
equipment
• Saves space in the control cabinet
• Reduces wiring outlay and costs
© Siemens AG 201
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