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Cover
1

Contents
3

Introduction
5

Functions and characteristics
15

Introduction
16

Protection of distribution systems
28

Power Meter functions
34

Operating-assistance functions
36

Switchboard-display functions
38

Compact NSX communication
40

Accessories for Micrologic trip units
46

Earth-leakage protection
48

Motor protection
50

Special applications
64

Switch-disconnectors
70

Source-changeover systems
72

Accessories and auxiliaries
76

Installation recommendations
109

Operating conditions
110

Installation in switchboards
111

Control wiring
114

Temperature derating
116

Power loss/Resistance
118

Dimensions and connection
121

Dimensions and mounting
122

Front-panel accessories
138

Front-panel cutouts
140

Power connections
152

Wiring diagrams
163

Compact NSX100 to 630
164

Additional characteristics
173

Tripping curves
174

Catalogue numbers
189

NSX100 to 250
191

NSX400 to 630
211

Glossary
232

Accessories
233

Circuit-breaker characteristics (IEC 60947-2)
233

Communication
235

Components
236

Controls
236

Discrimination / Cascading
237

Environment
238

Harmonics
239

Measurements
239

Protection
240

Relays and auxiliary contacts
241

Switchgear
241

Three-phase asynchronous motors and their protection
242

Trip units
243