Switch Disconnectors

Switch Disconnectors

3KM Switch Disconnectors with Fuses and Isolating Plug Connector up to 400 A

Introduction

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Siemens LV 10 · 2014

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Overview

All switch disconnectors feature double contact interruption and

an isolating distance. As a result, the fuses are de-energized

when the switch disconnectors are in the disconnected position.

The 3KM switch disconnectors with fuses also feature an isolat-

ing plug connector. This facilitates mounting and contact estab-

lishment in motor control centers (MCCs) in conjunction with ver-

tical busbars. Generally all 3K.5 switch disconnectors can be

secured to the shaft with padlock against unauthorized

reclosing.

Identical accessories for 3KA switch disconnectors and for

3KL and 3KM switch disconnectors with fuses simplify stock

keeping.

Please inquire about a special variant with reduced values that

is particularly resistant to atmospheres high in sulfur, e.g. in the

paper and cellulose processing industries.

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Application

3KM switch disconnectors with fuses protect against overload

and short-circuits as main control and EMERGENCY-STOP

switches of switchgear assemblies, distribution boards, power

supply and motor outgoing feeders.

In conjunction with SITOR semiconductor fuses, they are also

used in UPS systems, frequency converters and capacitor con-

trol systems.

All 3K switch disconnectors are climate-proof and meet the

requirements of IEC 60947-1, IEC 60947-3 and VDE 0660

Part 107.

3KM basic device

Plug-in contact strip for 3KM (part of basic device)

Fuses, optionally BS 88 or LV HRC fuses

Coupling driver

Extension shaft

Single-pole terminal cover from 63 A to 630 A, IP20

(vertical to operator side)

Terminal cover, IP20 (vertical to operator side)

Standard products from the Siemens 3SB1 range

are used as auxiliary switches.

8UC9 knob for fixed mounting in standard version (black) or

EMERGENCY-STOP version (red), or

All components from the switch to the actuator are provided with

non-interchangeability features.

8UC7 door-coupling rotary operating mechanism in standard

version (ti-grey) or EMERGENCY-STOP version (red/yellow)

Optional

NSE0_02131b