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Switch Disconnectors and Fuses
Introduction
■
Overview
Type
SENTRIC LD main control and EMERGENCY-STOP switches from 16 A to 125 A
Rated uninterrupted current I
at 35 °C ambient temperature
Rated operating voltage U
AC-3 motor load switch
operational switching of individual motors
7
at 220 ... 240 V
at 380 ... 440 V
at 660/690 V
AC-23A main control switch,
maintenance switch
Frequent, but not operational switching of
individual motors
at 220 ... 240 V
at 380 ... 440 V
at 660/690 V
Switch versions
Front mounting
• Central
• Four-hole
Base mounting
• Central
• Four-hole
Distribution board mounting
Molded-plastic enclosure
• Heavy-gauge threaded joints
• Metric screws
Switch accessories
4th pole (N conductor)
(leading switch-on,
delayed switch-off contact)
N terminal
PE/ground terminal
Auxiliary contacts
1 NO + 1 NC
1 NO
1 NC
7/2
Siemens LV 10 · 2004
3LD20
A
16
U
V
690
e
kW
3.0
kW
5.5
kW
5.5
kW
4.0
kW
7.5
kW
7.5
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
3LD21
3LD22
3LD25
25
32
690
690
4.0
5.5
7.5
9.5
7.5
9.5
5.0
6.0
9.5
11.5
9.5
11.5
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
3LD27
63
100
690
690
11.0
18.5
18.5
30.0
15.0
22.0
11.0
18.5
22.0
37.0
18.5
30.0
✓
–
✓
✓
✓
–
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
3LD28
125
690
22.0
37.0
30.0
22.0
45.0
37.0
–
✓
–
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓