Switch Disconnectors

Switch Disconnectors

3NP1 Fuse Switch Disconnectors up to 630 A

Introduction

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Siemens LV 10 · 2014

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Benefits

Advantages during planning and configuration

• Low level of equipment variation due to easy convertibility of

cable feeder at top/bottom (delivered from factory with cable

feeder at bottom).

• Only one device variant for applications in industry and infra-

structure thanks to touch and reach-around protection as a

standard feature.

• Uniform grid sizes for easy configuration.

Advantages during operation and service

• The optional rear covers for the cable connections ensure

optimum touch protection even for switchgear assemblies

with rear access.

• Innovative design enables the highest safety for equipment

and personnel.

• Fuses can be released and removed using a release shaft.

• Lockable and sealable design enables safe working and pre-

vents unauthorized access.

Advantages during installation

• Only one device version is required for cable feeders at

top/bottom and there is no need to intervene in the internal

conducting paths.

• One device version with very high short-circuit values dis-

penses with having to order and install arc splitters to increase

the electrical values.

• On all sizes it is possible to install 2 CO contacts for indicating

the switching position.

• All devices feature all-round touch protection.

• Box terminals are available for all sizes and shorten the

mounting time appreciably.

• Snapping on the sizes NH000 and NH00 shortens the

mounting time greatly compared to fixing with screws.

• The screw-fixing method on sizes NH1, NH2 and NH3 pro-

vides for easy positioning and at the same time secure con-

tacting of the larger and heavier device versions.

• Small space requirement through compact devices and bus-

bar supports which can be built over.

• Device versions for busbar mounting can be converted to

5 mm or 10 mm thick busbars without parts which can be lost

or broken off.

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Application

Possible uses

3NP1 fuse switch disconnectors can be used for protecting and

switching the most diverse electrical loads:

• Motor starter combinations

• In conjunction with SITOR semiconductor fuses for the

protection of frequency converters and soft starters

• Fusing of compensation modules

• Cable feeders

• Group fusing of small loads

The devices are optimized for operation in all kinds of system

environments:

• Low-voltage switchgear assemblies for power distribution and

MCCs (e.g. main and sub-distribution boards)

• Distribution systems with cover levels of 32 and 70 mm or

45 and 70 mm

• Mechanical engineering

• Railway applications

Fuse monitoring

Fuse monitoring is used to detect, indicate and report faults:

• MFM – electromechanical fuse monitoring for AC/DC networks

• EFM 10 – electronic fuse monitoring for AC networks

• EFM 20 – electronic fuse monitoring with line monitoring

for AC networks

• EFM 25 – electronic fuse monitoring with line monitoring

for DC networks

Standards and specifications

The 3NP1 fuse switch disconnectors are compliant with:

• IEC 60947-1, EN 60947-1

• IEC 60947-3, EN 60947-3

Mounting

Floor mounting

3NP1 fuse switch disconnector for floor mounting

Busbar mounting

3NP1 fuse switch disconnector for busbar mounting

System

cover

(alternatively)

Mounting plate

Size 1, 2, 3

Size 000, 00

NSG0_00236

Mounting plate

Busbar support

Base

Mounting on Siemens 8US

busbar systems with 32/70 mm

cover level

Mounting on Rittal Riline 60

busbar systems with base

NSG0_00237