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Overload Relays
3RB2 Solid-State Overload Relays
3RB20, 3RB21 for standard applications
■
Technical specifications
Type
Size
Width
General data
Trips in the event of
Trip class acc. to IEC 60947-4-1
Phase failure sensitivity
Overload warning
Reset and recovery
• Reset options after tripping
• Recovery time
- For automatic RESET
- For manual RESET
- For remote RESET
Features
• Display of operating state on device
• TEST function
• RESET button
• STOP button
Explosion protection – safe operation of motors with
"increased safety" type of protection
EC type test certificate number acc. to
directive 94/9/EC (ATEX)
Ambient temperatures
• Storage/transport
• Operation
• Temperature compensation
• Permissible rated current at
- Temperature inside control cabinet 60 °C,
stand-alone installation
- Temperature inside control cabinet 60 °C,
mounted on contactor
- Temperature inside control cabinet 70 °C
Repeat terminals
• Coil repeat terminal
• Auxiliary contact repeat terminal
Degree of protection acc. to IEC 60529
Touch protection acc. to IEC 61140
Shock resistance with sine acc. to IEC 60068-2-27
Electromagnetic compatibility (EMC)
– Interference immunity
• Conductor-related interference
- Burst acc. to IEC 61000-4-4
(corresponds to degree of severity 3)
- Surge acc. to IEC 61000-4-5
(corresponds to degree of severity 3)
• Electrostatic discharge acc. to IEC 61000-4-2
(corresponds to degree of severity 3)
• Field-related interference acc. to IEC 61000-4-3
(corresponds to degree of severity 3)
Electromagnetic compatibility (EMC)
– Emitted interference
Resistance to extreme climates – air humidity
Dimensions
Installation altitude above sea level
Mounting position
Type of mounting
1) On request.
I
2) S0 for 6 ... 25 A, CLASS 20,
I
S0 for 6 ... 25 A, CLASS 30,
20
Siemens · 2011
3RB20 16,
3RB21 13
S00
45 mm
Overload, phase failure, and phase unbalance
+ ground fault (for 3RB21 only)
CLASS 10/20/5, 10, 20 and 30 adjustable (depending on the version)
Yes
No
Manual, automatic and remote RESET (depending on the version)
min.
Approx. 3 min
min.
Immediately
min.
Immediately
Yes, by means of switch position indicator slide
Yes, test of electronics by pressing the TEST button /
test of auxiliary contacts and wiring of control circuit
by actuating the switch position indicator slide /
self-monitoring
Yes
No
PTB 06 ATEX 3001
°C
-40 ... +80
°C
-25 ... +60
°C
+60
%
100
%
100
1)
%
Yes
Yes
IP20
Finger-safe
g/ms
15/11
kV
2 (power ports), 1 (signal ports)
kV
2 (line to earth), 1 (line to line)
kV
8 (air discharge), 6 (contact discharge)
V/m
10
Degree of severity B acc. to EN 55011 (CISPR 11) and EN 55022 (CISPR 22)
%
100
See dimensional drawings
m
Up to 2000
Any
Direct mounting/stand-alone
installation with terminal bra-
cket
= 19 A;
emax
= 16 A.
emax
3RB20 26,
3RB20 36,
3RB21 23
3RB21 33
S0
S2
45 mm
55 mm
II (2) GD
2)
100
100
2)
100
100
Not required
Not required
4)
IP20
5)
Direct mounting/stand-alone installation
3) 90 % for relay with current setting range 160 ... 630 A.
4) Terminal compartment: degree of protection IP00.
5) Signaling contact 97/98 in position "tripped": 4/11 g/ms.
3RB20 46,
3RB20 56,
3RB20 66,
3RB21 43
3RB21 53
3RB21 63
S3
S6
S10/S12
70 mm
120 mm
145 mm
100
100
100 or 90
100
70
70
Finger-safe,
Finger-safe
for busbar
with cover
connection
with cover
3)
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