SENTRON Switching and Protection Devices — Switch Disconnectors

Introduction

17/2

Siemens LV 1 · 2007

■Overview

✓ Available

-- Not available

Type

3LD20

3LD21

3LD22

3LD25

3LD27

3LD28

3LD main and EMERGENCY-STOP switches from 16 A to 125 A

Rated uninterrupted current Iu

at 35 °C ambient temperature

A

16

25

32

63

100

125

Rated operational voltage

Ue

V

690

690

690

690

690

690

AC-3 motor load switches

Operational switching of individual motors

• At 220 ... 240 V

kW

3.0

4.0

5.5

11.0

18.5

22.0

• At 380 ... 440 V

kW

5.5

7.5

9.5

18.5

30.0

37.0

• At 660/690 V

kW

5.5

7.5

9.5

15.0

22.0

30.0

AC-23A main control switches, maintenance switches

Frequent, but not operational switch-

ing of single motors

• At 220 ... 240 V

kW

4.0

5.0

6.0

11.0

18.5

22.0

• At 380 ... 440 V

kW

7.5

9.5

11.5

22.0

37.0

45.0

• At 660/690 V

kW

7.5

9.5

11.5

18.5

30.0

37.0

Switch versions

Front mounting

• Central

✓

✓

✓

✓

--

--

• Four-hole

✓

✓

✓

✓

✓

✓

Floor mounting

• Central

✓✓✓

✓

--

--

• Four-hole

✓✓✓

✓✓

✓

Distribution board mounting

✓

✓

✓

✓

✓

✓

Molded-plastic enclosures

• Metric screwed glands

✓✓✓

✓✓

✓

Switch accessories

4th pole (neutral conductor)

(leading switch-on,

delayed switch-off)

✓

✓

✓

✓

✓

✓

N terminals

✓✓✓

✓✓

✓

PE-ground terminals

✓

✓

✓

✓

✓

✓

Auxiliary contact elements

• 1 NO + 1 NC

✓✓✓

✓✓

✓

LV1_17.book Seite 2 Freitag, 26. Januar 2007 11:33 11

© Siemens AG 2007