Explosion-proof boxes, models: KVMK 2.1 Exd-A-ХХХ… Х, КВМК 2.1 Exd-Н-ХХХ… Х, are intended for connection (branching) of electric circuits of general and special purpose (power circuits, control circuits, signaling, etc. .) in hazardous areas. Boxes are used for the entry of armored, unarmored electric cables of round or flat section and cables in a metal hose or pipe.
The material used for the manufacture of boxes is aluminum alloy or stainless steel 12X18H10T.
Boxes and Ex-components are provided with the following types of protection: GOST IEC 60079-1-2013 "flameproof enclosures "d"" and GOST IEC 60079-31-2013 equipment with dust ignition protection enclosures "t".
Boxes have various types of flameproof connections in accordance with the requirements of GOST IEC 60079-1-2013, are made both by welding for stainless steel and by casting for aluminum alloy. The viewing window can be located on the front cover of the housing.
The boxes belong to electrical equipment of groups I, II and III according to GOST 31610.0-2014 and are intended for use in explosive areas of premises and outdoor installations in accordance with the explosion protection marking. The equipment can be used in explosive zones of class 0, 1 and 2 according to GOST IEC 60079-10-1-2011, as well as in mines and mines GOST 31439-2011 (EN 1710:2005). The environment may contain explosive mixtures of gases and vapors with air of category IIA, IIB, IIB + H2, IIC, dust IIIC.
| Switching box series - KVMK, model range: KVMK 2.1 Exd-A-ХХХ… Х, КВМК 2.1 Exd-Н-ХХХ… Х. | |
| Group marking for stainless steel electrical equipment I and III |  PB Ex db I Mb X / Ex tb IIIС T80°C… T190°C Db X |
| Marking for stainless steel and aluminum alloy for electrical equipment group II and III | 1Ex db IIC T6… T3 Gb X / Ex tb IIIС T80°C… T190°C Db X |
| Housing material | stainless steel Aluminium alloy |
| Housing material for mine design | stainless steel |
| Type of flameproof connection | cylindrical connection |
| Internal volume, cm 3 | over 2000 |
| The degree of protection of the shell in accordance with GOST 14254-2015 | IP66 |
| Ambient temperature in operation | T6 - from -60°C to +80°C T5 - from -60°C to +95°C Т4 – from -60°C to +130°C Т3 - from -60°C to +180°C |
| Temperature class according to GOST 31610.0-2014. | T6, T5, T4, T3 |
| Climatic performance | HL (F), UHL (NF), OM (MU) |
| Switched current, A - alternating current - direct current | no more than 800 no more than 800 |
| Switched voltage, V - alternating current - direct current | no more than 1000 no more than 1000 |
| Model | Overall dimensions without cable inputs and external components | The interior space mounting plate | Installation dimensions |
| Aluminium alloy | |||
| KVMK 2.1 Exd-A-121211 | 120x120x107 mm | 94x94x69 mm | 100x145 mm |
| KVMK 2.1 Exd-A-151512 | 151x151x113 mm | 124x124x78 mm | 126x174 mm |
| KVMK 2.1 Exd-A-171713 | 175x175x120 mm | 146x146x85 mm | 150x195 mm |
| KVMK 2.1 Exd-A-232316 | 235x235x146 mm | 203x203x106 mm | 196x267 mm |
| KVMK 2.1 Exd-A-272722 | 277x277x195 mm | 248x248x152 mm | 236x316 mm |
| KVMK 2.1 Exd-A-434329 | 430x430x235 mm | 395x395x182 mm | 390x480 mm |
| Stainless steel | |||
| KVMK 2.1 Exd-N-171713 | 175x175x120 mm | 146x146x85 mm | 150x195 mm |
| KVMK 2.1 Exd-N-232316 | 235x235x146 mm | 203x203x106 mm | 196x267 mm |
| KVMK 2.1 Exd-N-272722 | 277x277x195 mm | 248x248x152 mm | 236x316 mm |
| KVMK 2.1 Exd-N-434329 | 430x430x235 mm | 395x395x182 mm | 390x480 mm |
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