Table of contents
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
5
4 Inspection & Maintenance ................................................................................................................. 165
4.1 General ........................................................................................................................... 165
4.2 Safety regulations ............................................................................................................ 167
4.3 Planning of inspection and maintenance .......................................................................... 168
4.3.1 Inspection interval ........................................................................................................... 168
4.3.2 Scope .............................................................................................................................. 168
4.3.3 Logging ........................................................................................................................... 170
4.4 Performing inspection ...................................................................................................... 171
4.4.1 General ........................................................................................................................... 171
4.4.2 Visual inspection .............................................................................................................. 171
4.4.3 Check of the available documentation and of the rating/accessory label ............................ 172
4.4.4 Testing of mechanical function of the circuit breaker ........................................................ 172
4.4.5 Testing of mechanical function of the withdrawable circuit breaker and the guide
frame .............................................................................................................................. 173
4.4.6 Testing of auxiliary circuits ............................................................................................... 173
4.4.7 Testing of mechanical and electrical function of internal accessories................................. 174
4.4.8 Testing of settings and inspection of the electronic trip unit ............................................. 175
4.4.9 Inspection of arc chutes, arc chute covers and main contact system.................................. 176
4.4.10 Checking the wear on the contacts................................................................................... 177
4.5 Preparation for maintenance work ................................................................................... 178
4.6 Maintaining the arc chutes ............................................................................................... 180
4.7 Maintaining the main contact system ............................................................................... 181
5 Technical specifications ..................................................................................................................... 196
5.1 Circuit diagrams ............................................................................................................... 196
5.1.1 Overall circuit diagram .....................................................................................................
196
5.1.2 Terminal connection diagram of secondary disconnect terminals ...................................... 198
5.1.3 Circuit diagram for undervoltage release with delay ......................................................... 199
5.2 Dimension drawings ........................................................................................................ 199
5.2.1 Fixed-mounted Circuit Breakers ........................................................................................ 199
5.2.2 Withdrawable Circuit Breakers .......................................................................................... 202
5.2.3 Accessories 3 pole / 4 pole ............................................................................................... 203
5.2.4 Door cutout ..................................................................................................................... 205
5.2.5 Current transformer for N conductor ................................................................................ 206
6 Troubleshooting ................................................................................................................................ 207
7 Disposal ............................................................................................................................................. 209
A ESD guidelines ................................................................................................................................... 210
B List of abbreviations .......................................................................................................................... 212
Glossary ............................................................................................................................................. 215
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