Combustible dusts are produced in various areas of industry such as food and animal feed production. When mixed with the oxygen in the air, these dusts form an explosive atmosphere if they are of sufficient size and minimum density. If this atmosphere ignites, explosions will occur, which can result in severe personal injury and property damage. In order to avoid ignition from sparking when operating a repair switch, these safety requirements must be met. In our main catalog you will find an overview of our approved ATEX repair switches for zone 21. We offer you 3 and 4 pole switches up to 55 A and 6 pole switches up to 32 A. Our expert contact persons from the office and field service are available to you with competent advice on everything to do with Kraus & Naimer switchgear. Outstanding quality for Ex areas ATEX Maintenance and Safety switch (Zone 21) by Kraus & Naimer
2 ATEX Units www.krausnaimer.com VERSIONS Zone 21, 3 pole + 1 NO/NC, IP 66 Zone 21, 4 pole + 1 NO/NC, IP 66 Zone 21, 6 pole + 1 NO/NC, IP 66 EMC Model Maintenance and Safety switch acc. to EC ATEX-Directive 94/9/EG equipment group II, Category 2, Zone 21, Indication of field D Mechanical impact resistance 7J Rating AC-23B (A) Thermal Current lu/lth Order number | Article name Order number | Article name With auxiliary contacts (1 NO, 1 NC) 7,5 kW 25 A 70027276 | KG20.T103/NL-EXBA.KNBOX 70022472 | KG20.T203/NL-EXRA.KNBOX 11 kW 32 A 70022644 | KG32.T103/NL-EXBA.KNBOX 70023921 | KG32.T203/NL-EXRA.KNBOX 15 kW 40 A 70023925 | KG41.T103/NL-EXBA.KNBOX 70023928 | KG41.T203/NL-EXRA.KNBOX 20 kW 55 A 70023931 | KG64.T103/NL-EXBA.KNBOX 70023934 | KG64.T203/NL-EXRA.KNBOX EMC-Model with auxiliary contacts (1 NO, 1 NC) 7,5 kW 25 A 70022632 | KG20.T103/NL-EXBC*KNBOX 70022638 | KG20.T203/NL-EXRC*KNBOX 11 kW 32 A 70022932 | KG32.T103/NL-EXBC*KNBOX 70023922 | KG32.T203/NL-EXRC*KNBOX 15 kW 40 A 70023926 | KG41.T103/NL-EXBC*KNBOX 70023929 | KG41.T203/NL-EXRC*KNBOX 20 kW 55 A 70023932 | KG64.T103/NL-EXBC*KNBOX 70022290 | KG64.T203/NL-EXRC*KNBOX KG20 - KG32: 2 x M25 ATEX cable glands and 1 dummy plug M20 included. KG41 - KG64: 2 x M25 ATEX cable glands, 2 x M32/M25 adaptors and 1 dummy plug M20 included. Note for EMC model: Maintenance Switches for EMC-compliant connection of FU-regulated drives use shield clips. These clips are used to continue the cable shield circuit through the enclosure. The configuration of the Maintenance Switch between FU and motor allows the use as Disconnector up to 400 Hz and as Load Switch at frequencies from 40 Hz to 100 Hz. Each Maintenance Switch has as standard 2 auxiliary contacts, 1 NC and 1 NO. Via the NO (20 ms leading) the FU can be switched off before the main contacts of the switch open. For the rating of the switch please note that the motor may have approx. 10 % higher charging rate due to the higher loss in FUoperation e.g. a motor with 7,5 kW rating the motor current has to be determined with 16,7 A instead of 15,2 A.w Rating AC-23B (A) Thermal Current lu/lth Order number | Article name Order number | Article name With auxiliary contacts (1 NO, 1 NC) 7,5 kW 25 A 70022633 | KG20.T104/NL-EXBA.KNBOX 70022639 | KG20.T204/NL-EXRA.KNBOX 11 kW 32 A 70022933 | KG32.T104/NL-EXBA.KNBOX 70023923 | KG32.T204/NL-EXRA.KNBOX 15 kW 40 A 70023927 | KG41.T104/NL-EXBA.KNBOX 70023930 | KG41.T204/NL-EXRA.KNBOX 20 kW 55 A 70023933 | KG64.T104/NL-EXBA.KNBOX 70023935 | KG64.T204/NL-EXRA.KNBOX KG20 - KG32: 2 x M25 ATEX cable glands and 1 dummy plug M20 included. KG41 - KG64: 2 x M25 ATEX cable glands, 2 x M32/M25 adaptors and 1 dummy plug M20 included. Rating AC-23B (A) Thermal Current lu/lth Order number | Article name Order number | Article name With auxiliary contacts (1 NO, 1 NC) 7,5 kW 25 A 70022634 | KG20.T106/NL-EXBA.KNBOX 70022640 | KG20.T206/NL-EXRA.KNBOX 11 kW 32 A 70023920 | KG32.T106/NL-EXBA.KNBOX 70023924 | KG32.T206/NL-EXRA.KNBOX 2 x M32 ATEX cable glands and 1 dummy plug M20 included.
3 www.krausnaimer.com MOUNTING 115 190 102 M25/M32 M20 26 101 128 31 5,3 80 7 115 190 102 M25/M32 M20 26 101 128 31 5,3 80 7 115 190 102 M25/M32 M20 26 101 128 31 5,3 80 7 31 32 43 44 L1 T1 L2 T2 L3 T3 N N 31 32 43 44 L1 T1 L2 T2 L3 T3 N N L1 T1 L2 T2 L3 T3 13 14 21 22 3 pole + 1NO/1NC EMC L1 T1 L2 T2 L3 T3 31 32 43 44 3 pole + 1NO/1NC 4 pole + 1NO/1NC 6 pole + 1NO/1NC Cable-Ø shield Shield clamp Type Ø min-max KG20-KG64 12-16 Cable-Ø shield Shield clamp Type Ø min-max KG20-KG64 12-16 Maximal number of padlocks Padlock device Shackle-Ø Number of locks 6 3 Maximal number of padlocks Padlock device Shackle-Ø Number of locks 6 3 Maximal number of padlocks Padlock device Shackle-Ø Number of locks 6 3
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