Datasheet

3RV Motor Starter Protectors/Circuit Breakers up to 100 A
21
Siemens · 2010
General data
■ Characteristic curves
The time/current characteristic, the current limiting characteris-
tics and the I
2
t characteristic curves were determined according
to EN/IEC 60947.
The tripping characteristic of the inverse-time delayed overload
release (thermal overload releases, 'a' releases) for DC and AC
with a frequency of 0 Hz to 400 Hz applies for the time/current
characteristic.
The characteristic curves apply to the cold state; at operating
temperature, the tripping times of the thermal releases are redu-
ced to approximately 25 %.
Under normal operating conditions, all three poles of the device
must be loaded. The three main current paths must be con-
nected in series in order to protect single-phase or DC loads.
With two-pole and three-pole loading, the maximum deviation in
the tripping time of 3 times the setting current and upwards is
±20 % and thus in accordance with EN 60079.
The tripping characteristics for the instantaneous, electromag-
netic electronic trip units (short-circuit releases, 'n' releases) are
based on the rated current I
n
that also represents the maximum
value of the setting range for motor starter protectors with adjus-
table overload releases. If the current is set to a lower value, the
tripping current of the 'n' release is increased by a correspon-
ding factor.
The characteristic curves of the electromagnetic electronic trip
units apply to frequencies of 50 Hz/60 Hz. Appropriate correc-
tion factors must be used for lower frequencies down to
16
2
/
3
Hz, for higher frequencies up to 400 Hz and for DC.
Schematic representation of typical time/current characteristic of 3RV10
The above characteristic curve for the motor starter protector re-
lates to a specific setting range. It is, however, also valid as a
schematic representation of motor starter protectors with other
current ranges.
Time/current characteristic curves, current limiting characteristic
curves and I
2
t curves can be ordered from "Technical
Assistance":
• Either by e-mail to:
[e-mail]
• Or on the Internet:
http:/www.siemens.com/automation/service&support
3RV16 voltage transformer circuit breakers up to 3 A
The specified tripping characteristics of the thermal overload re-
lease (a) correspond to the mean value of the scatter band in the
cold state. At operating temperature, these times are reduced to
approximately 25 % of the specified values.
The characteristic curves below are schematic representations.
Precise characteristic curves can be ordered from "Technical
Assistance":
• Either by e-mail to:
[e-mail]
• Or on the Internet:
http:/www.siemens.com/automation/service&support
10
5
2
1
10 000
5000
2000
1000
500
200
100
50
20
10
5
0,2
1
0,5
0,02
0,1
0,05
0,002
0,01
0,005
100
60
40
2
0,6
0,8
1
2
3
4
6
8
10
0,001
20 30 40 80 x
n
NSB0_00004b
min
60
3-pole
loading
Class 20
3-pole
loading
Class 10
2-pole
loading
Class 10
Opening time
Current
1000
100
10
1
1
1
a)
b)
0,1
0,01
s
2 4 6 10 20 40 A10060
2 3
1.4 A / 6 A
a) Thermal overload release
b) Instantaneous electromagnetic trip unit
1
2
3
3 A / 20 A
2.5 A / 10.5 A
NSB0_01352b