Siemens 7SR12 Argus User Manual

7SR11 & 7SR12 Commissioning and Maintenance Guide
©2017 Siemens Protection Devices Limited Chapter 6 Page 44 of 72
2.13 Thermal Overload (49)
7
SR12
46
BC
46
NPS
(
x
2)
37
(
x
2
)
49
50
BF
51
V
V
L1
(V
A
)
V
L
2
(V
B
)
V
L3
(
V
C
)
I
L
1
(
I
A
)
81
HBL
2
37
(
x
2
)
49
50
BF
51
V
I
L
2
(
I
B
)
81
HBL
2
37
(
x2
)
49
50
BF
51
V
I
L
3
(
I
C
)
81
HBL
2
I
4
(
I
G
)
74
T/
CCS
NOTE
: The use of some
functions are mutually exclusive
67
/
50
(
x
4
)
67/
51
(
x
4
)
67
/
50
N
(
x4
)
67
/
50
(
x
4)
67
/
50
(x
4
)
67
/
51
(
x4
)
67
/
51
(x
4
)
67
/
51N
(x
4
)
67/
50
SEF
67
/
51
SEF
27
59
(
x
4)
27
59
(
x4
)
27
59
(x
4
)
47
(x
2
)
79
Optional
59
N
(x
2)
Note:
Example shows
Voltage Config
=
Van
, Vbn
, Vcn
60
CTS
60
VTS
50BF
51c
51
c
51
c
64H
81
(x
4)
Figure 2-14 Thermal Overload
Voltage Inputs: n/a
Current Inputs: I
L1
(I
A
), I
L2
(I
B
), I
L3
(I
C
),
Disable: 51, 50, 37, 50CBF
Map Pickup LED: 49Alarm
The current can be applied from a 3P balanced supply or phase by phase from a 1P supply. Alternatively the 3
phase current inputs can be connected in series and injected simultaneously from a single 1P source.
The Thermal Overload Setting and Time Constant Setting can be considered together to calculate the operating
time for a particular applied current.
The following table lists operate times for a range of Time Constant Settings for an applied current of 2x the
Thermal Overload setting. Ensure that the thermal rating of the relay is not exceeded during this test.

Siemens 7SR12 Argus Specifications

General

Brand	Siemens
Model	7SR12 Argus
Category	Protection Device
Language	English