Siemens AC-21 Brochure page 2

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
✓
✓
✓
✓
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✓
✓
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✓
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✓
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✓
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
–
✓
–
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓