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Switch Disconnectors
3LD Main Control and EMERGENCY-STOP Switches up to 250 A
Introduction
7/5
Siemens LV 10 · 2014
■
Technical specifications
3LD main control and EMERGENCY-STOP switches for UL/CSA
1)
Depending on the cable infeed, only small cross-sections are possible with
devices in molded-plastic enclosures
2)
Values in brackets apply to devices in molded-plastic enclosure
Standards
DIN VDE 0660, IEC 60947
Switches
Type
3LD20 3LD21 3LD22 3LD25 3LD27 3LD28 3LD23 3LD24
Rated insulation voltage
U
i
V 690
690
50 ... 60
Rated operational voltage
U
e
V AC
Rated frequency
Hz
Rated impulse withstand voltage
U
imp
kV 6
6
6
6
6
6
6
6
Rated short-time withstand current
(1 s current, rms value)
A 340
640
640
1260
2000 2000 4000 4000
Short-circuit protection, max. back-up fuse (gL)
A 20
25
40
63
100
125
160
250
Rated conditional short-circuit current with upstream fuses
at AC 50/60 Hz, 690 V
kArm
s
50
50
50
50
50
20
50
50
Maximum permissible let-through
I
2
t
value
kA
2
s 2.5
4
9
21
64
104
185
557
Permissible let-through current of the fuse
kA 3
3.5
4.5
6
10
10
15
15
Rated uninterrupted current
I
u
A 16
25
32
63
100
125
160
250
AC-21A load-break switch
Rated operational current
I
e
A 16
25
32
63
100
125
160
250
AC-3 motor load switches
In-service switching
of individual motors
Rating
At 220 ... 240 V
At 380 ... 440 V
At 660/690 V
kW
kW
kW
3.0
5.5
5.5
4.0
7.5
7.5
5.5
9.5
9.5
11.0
18.5
15.0
18.5
30.0
22.0
22.0
37.0
30.0
35.0
50.0
37.0
55.0
110.0
45.0
AC-23A main control switch
Repair switch
frequent, but not in-service switching
of individual motors
Rating
At 220 ... 240 V
At 380 ... 440 V
At 660/690 V
kW
kW
kW
4.0
7.5
7.5
5.0
9.5
9.5
6.0
11.5
11.5
11.0
22.0
18.5
18.5
37.0
30.0
22.0
45.0
37.0
45.0
75.0
45.0
75.0
132.0
55.0
Power loss per conducting path
at
I
e
W 0.5
1.1
1.8
4.5
7.5
12.0 36.0 36.0
Endurance
mechanical
Switching cycles
100 000
Switching frequency
1/h 50
Permissible ambient temperature
°C -25 ... +55
Isolating features
Up to max.
V 690
Conductor cross-sections for main conductors
1)
Solid or stranded
mm
2
1 ... 6 1.5 ... 16 1.5 ... 16 2.5 ... 35 4 ... 50 4 ... 50 16 ...185 16 ... 185
Finely stranded with end sleeve (max.)
mm
2
4
10
10
16
35
35
150
150
Conductor cross-sections
Copper cable
AWG 18 ... 10 14 ... 8 14 ... 8 14 ... 6 12 ... 1 12 ... 1
Torque for terminal
Nm 1.5 ... 2 2 ... 2.5 2 ... 2.5 2.5 ... 3 2.5 ... 3 2.5 ... 3 9.5 ... 10 9.5 ... 10
Touch protection
according to EN 50274
Yes
Auxiliary switches
Rated insulation voltage
U
i
V 500
Rated operational voltage
U
e
V AC 500
Rated uninterrupted current
I
u
A 10
Rated operational current
I
e
, AC-15 At 120 V
A 6
At 220 ... 240 V
A 3
At 380 ... 415 V
A 1.8
At 500 V
A 1.4
Short-circuit protection, aux. switch,
max. back-up fuse (gL/gG)
A 10
Conductor cross-sections for auxiliary conductors
Connection type
Terminals
2 × (0.75 ... 2.5), 1 × 4
2 × (0.75 ... 1.5) 1 x 2.5
0.8
Solid or stranded
mm
2
Finely stranded with end sleeve
mm
2
Torque for terminal
Nm
Standards
UL/CSA
Switches
Type
3LD20 3LD21 3LD22 3LD25 3LD27 3LD28 3LD23 3LD24
Rated operational voltage
U
e
V AC 600
600
600
600
600
600
600
600
Rated uninterrupted current
I
u
A 10
20
30
60
100
125
160
250
Current rating
A 600 A 600 A 600 --
--
--
--
--
Pilot duty
P 600 P 600 P 600 --
--
--
--
--
Conventional thermal current
I
th
A 16
25
32
63
100
125
160
250
Maximum rated power (AC-3)
3
120 V
HP 1
3
3
5
10
15
--
--
Alternating current motors 40 ... 60 Hz
240 V
HP 3
7.5
10 (7.5)
2)
15
30
40
40
50
(HP = PS)
480 V
HP 7.5
10
20 (15)
2)
40
60
75
75
100
600 V
HP 10
15
30 (20)
2)
50
75
100
75
75
1
120 V
HP 0.5
2
2
3
--
--
--
--
240 V
HP 1.5
3
3
10
--
--
--
--
Conductor cross-sections
Cu cable
AWG 18 ... 10 14 ... 8 14 ... 8 14 ... 6 12 ... 1 12 ... 1 1 ... MCM400
Torque
Nm 1.5 ... 2 2 ... 2.5 2 ... 2.5 2.5 ... 3 2.5 ... 3 2.5 ... 3 10
10
© Siemens AG 2014