Switch Disconnectors

3LD Main Control and EMERGENCY-STOP Switches up to 250 A

Introduction

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Siemens LV 10 · 2014

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Overview

The 3LD main control and EMERGENCY-STOP switches are

manually operated switch disconnectors according to

IEC 60947-3/VDE 0660 Part 107 (EN 60947-3) and comply with

the conditions for switch disconnectors.

In EN 60204-1 (VDE 0113 Part 1), main control switches are

called "disconnector units", while EMERGENCY-STOP switches

are termed "devices for emergency shutdown".

The 3LD switches for 16 to 250 A are approved according to

UL 508 and can be used as "manual motor controllers" and

"motor disconnects". In addition, the 3LD switch disconnectors

have CCC certification.

Maintenance personnel can protect themselves against

unauthorized startup with padlocks (up to three can be fitted).

The 3LD switches can be used in any mounting position.

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Application

The 3LD switches are used for switching main and auxiliary cir-

cuits, but also for switching three-phase motors and other loads

during maintenance and repair work.

They can be used as:

• ON-OFF switches

• EMERGENCY-STOP switches

• Main control switches according to EN 60204-1

NSG0_00112b

1 4th contact (N conductor)

2 N or PE/ground terminal, continuous

3 Auxiliary switch 1 NO + 1 NC

4 Rotary operating mechanism, red/yellow

5 Rotary operating mechanism, black

6 Front plate, English/German

7 Terminal cover, three-pole

8 Terminal cover, single-pole