4 NXAIR M 139-2021.9 / 07
1 Safety instructions ................................................................................................................................... 3
2 General instructions ................................................................................................................................. 8
2.1 General instructions ........................................................................................................................................ 8
2.2 Five Safety Rules of Electrical Engineering .................................................................................................... 8
2.3 Hazardous substances ................................................................................................................................... 8
2.4 Personal protective equipment (PPE) ............................................................................................................. 9
2.5 Due application ............................................................................................................................................... 9
2.6 Qualified personnel ......................................................................................................................................... 9
2.7 Update of the firmware of protection relays....................................................................................................10
3 Features ................................................................................................................................................... 11
4 Technical data ......................................................................................................................................... 12
4.1 Complete switchgear .....................................................................................................................................12
4.2 Basic prescriptions and standards .................................................................................................................12
4.3 Electromagnetic compatibility - EMC .............................................................................................................13
4.4 Rating plates ..................................................................................................................................................13
4.5 IAC classification ............................................................................................................................................13
4.6 Panel dimensions ...........................................................................................................................................14
4.7 Room planning ...............................................................................................................................................14
4.8 Operating conditions ......................................................................................................................................14
4.9 Vacuum circuit-breaker type 3AE ...................................................................................................................15
4.10 Operating instructions for circuit-breaker type 3AE ........................................................................................15
5 Overview of panel types ........................................................................................................................ 16
6 Panel design ........................................................................................................................................... 18
6.1 Basic design circuit-breaker panel, single-busbar system .............................................................................18
6.2 Basic design circuit-breaker panel with HV HRC fuse ...................................................................................18
6.3 Basic design circuit-breaker panel, double-busbar system ............................................................................19
7 Interlocks ................................................................................................................................................. 20
7.1 Mechanical interlocks for single-busbar system .............................................................................................20
7.2 Mechanical interlocks for double-busbar system ...........................................................................................21
7.3 Additional electromagnetic interlocks (optional) .............................................................................................21
7.4 Additional padlock interlock (optional) ............................................................................................................22
7.5 Additional key-operated interlock (optional) ...................................................................................................22
8 Accessories ............................................................................................................................................ 23
8.1 Operating tools ...............................................................................................................................................23
8.2 Service truck ..................................................................................................................................................25
8.3 Service truck versions ....................................................................................................................................25
9 Customer support .................................................................................................................................. 28
9.1 Service ...........................................................................................................................................................28
9.2 Repairs...........................................................................................................................................................28
9.3 Before you call ...............................................................................................................................................28
9.4 Service contact ..............................................................................................................................................28
10 Operating the circuit-breaker panel ...................................................................................................... 29
10.1 Control elements at the front side of the panel ...............................................................................................29
10.2 Position indicators visible on high-voltage door .............................................................................................30
10.3 Access to compartments ................................................................................................................................30
10.4 Opening the high-voltage door .......................................................................................................................30
10.5 Closing the high-voltage door ........................................................................................................................32
10.6 Positions of the withdrawable circuit-breaker .................................................................................................34
10.7 Racking the withdrawable circuit-breaker to service position .........................................................................35
10.8 Racking the withdrawable circuit-breaker to test position ..............................................................................37
10.9 Closing the circuit-breaker electrically ............................................................................................................40
10.10 Opening the circuit-breaker electrically ..........................................................................................................41
10.11 Closing the circuit-breaker manually ..............................................................................................................42
10.12 Opening the circuit-breaker manually ............................................................................................................45
10.13 Discharging the spring energy store ..............................................................................................................47
10.14 Charging the spring manually ........................................................................................................................48
10.15 Earthing the feeder manually .........................................................................................................................51
10.16 De-earthing the feeder manually ....................................................................................................................53
10.17 Removing the low-voltage connector .............................................................................................................56
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