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BETA Protecting
Low-Voltage Fuse Systems
3
NX1 LV HRC signal detectors
3/47
Siemens ET B1 · 10/2008
3
*
You can order this quantity or a multiple thereof.
■
Overview
LV HRC signal detectors are used for remote indication that the
LV HRC fuse links have been tripped. Three different solutions
are available:
• 3
NX1 021 signal detectors with signal detector link 3
The LV HRC signal detectors with signal detector link support
monitoring of LV HRC fuse links with non-insulated grip lugs
of sizes 000 to 4 at 10 A or more.
The signal detector link is connected in parallel to the LV HRC
fuse link. In the event of a fault, the LV HRC fuse links are
released simultaneously with the LV HRC fuse signaling link.
A tripping pin switches a floating microswitch
• 3
NX1 024 signal detector top
The signal detector top can be used with LV HRC fuse links, siz-
es 000, 00, 1 and 2, which are equipped with non-insulated grip
lugs and have a front indicator or combination alarm. It is simply
plugged into the grip lugs
• 5
TT3 170 fuse monitors
If a fuse is tripped, the front indicator springs open and switches
a floating microswitch. This solution should not be used for safe-
ty-relevant plants. For this purpose, we recommend our electron-
ic fuse monitors.
■
Benefits
Uniform solution for all sizes
LV HRC signal detectors reliably indicate when a fuse has
tripped. Tripped fuses are quickly located. This saves time and
increases plant availability.
The LV HRC signal detector top is a cost-effective solution for the
monitoring of Siemens LV HRC fuse links of sizes 000, 00, 1
and 2.
■
Selection and ordering data
$
LV HRC fuse link
%
LV HRC signal
detector
&
Microswitch
(
Spring contact
)
Hinged lid
*
Signal detector link
I2_13744
1
6
5
3
4
2
$
LV HRC fuse link
%
Front indicator
&
Signal detector top
(
Rocker/lever arm
$
%
&
(
Sizes
DT Order No.
Price
per PU
PG PU PS*/
P. unit
Weight
per PU
approx.
Unit(s) Unit(s) kg
LV HRC signal detectors
000 ... 4
A
3
NX1 021
014 1
1
0.036
Only for SIEMENS 3NA3, 3NA7 and 3ND
LV HRC fuse links with non-insulated grip
lugs
•
Rated voltage up to
690
V AC/600 V DC
•
Contact: microswitches 250 V AC, 6 A
•
Connection: flat termination 2.3 mm
Signal detector links
000 ... 4
•
Rated voltage up to
690
V AC/ 600 V DC
Response value > 9 V; 2.5 A;
For standard applications
A
3
NX1 022
014 1
3
0.015
Response value > 2 V; 7 A;
Only for meshed networks
C
3
NX1 023
014 1
3
0.015
Signal detector tops
000, 00, 1, 2
}
3
NX1 024
014 1
1
0.010
Only for SIEMENS 3NA3, 3NA7 and 3ND
LV HRC fuse links with non-insulated grip
lugs
•
Rated voltage up to 690 V AC/600 V DC
•
Contact: Microswitches 230 V AC, 5 A, 1 W
•
Connection: flat termination 2.3 mm
© Siemens AG 2008