EJB Enclosures - Extronics · Extronics Limited 1 Dalton Way, Midpoint 18, Middlewich, Cheshire,...

Extronics Limited 1 Dalton Way, Midpoint 18, Middlewich, Cheshire, UK. CW10 0HU Tel: +44 (0) 845 277 5000 Fax: +44 (0)845 277 4000 E-mail: [email protected] Web: www.extronics.com 333920-7.2 Copyright © Extronics Ltd 2016. The information contained in this document is subject to change without notice. Extronics can not be held responsible for any errors or inaccuracies within this document.

EJB Enclosures

The EJB Series is a range of explosion-proof enclosures, available in either aluminium alloy (EJB) or

stainless steel (EJB INX – see separate datasheet). These enclosures can be used in zone 1

environments as junction boxes with or without terminals, and to install other electrical equipment

such as switches, indicators, section switches, remote control switches and transformers.

These enclosures can be drilled and threaded both on walls and covers according to customer

specifications, using Extronics’ advanced CNC machining facilities.

Mechanical Characteristics

Certification ATEX II 2 G Ex d IIB+H2 T6...T3 - II 2 D Ex tD A21 T85°C...150°C IECEx Ex d IIB+H2 T6...T3 - Ex tD A21 T85°C...150°C

Body and cover Marine grade copper free aluminium light alloy

Screws Stainless steel

Internal mounting plate Hot dip galvanized steel / aluminium

Fixing Fixing lugs AL UNI EN 1706:1999 - galvanized steel stirrups sp. 10mm (EJB71 AND EJB91 ONLY)

Hinges On the long side - cast on enclosure body and cover

Ingress protection IP66

ATEX and IECEx Zone 1 certified

Explosion proof

Marine grade copper-free aluminium

IP66

http://www.extronics.com/


Optional Accessories, available on request:

External epoxy painting with colour on request

O-Ring gaskets on cover

Drain and breather valves

Internal anti-condensate painting orange RAL-2004

Glass windows on cover

Technical Features

CODE A

[mm]

B

[mm]

C

[mm]

D

[mm]

E

[mm]

F

[mm]

G

[mm]

H

[mm]

L

[mm]

BACK PLATE

X-Y [mm]

WEIGHT

[Kg] EJB-11 175 175 - 125 78 165 90 115 115 95 - 95 3.60

EJB-21 285 245 267 169 160 245 122 217 175 180 - 140 10.50

EJB-22 300 200 222 220 195 188 175 235 135 235 - 135 12.50

EJB-23 310 260 280 194 195 238 152 247 195 200 - 160 15.00

EJB-30 415 315 340 168 294 288 120 340 245 325 - 225 18.50

EJB-31 415 315 340 250 294 288 200 340 245 325 -225 20.50

EJB-51 566 366 388 257 360 343 203 495 295 460 - 260 36.50

EJB-61 670 470 490 360 500 437 310 595 395 560 - 360 57.00

EJB-63 670 470 490 235 500 437 184 595 395 560 - 360 47.00

EJB-71 742 542 572 425 520 580 360 645 445 590 - 390 110.00

EJB-73 742 542 572 308 520 532 215 645 445 590 - 390 90.00

EJB-91 960 660 700 460 700 650 370 830 530 758 - 448 202.00

EJB-93 960 660 700 305 700 650 193 830 530 758 - 448 145.00



Heat Dissipation Table

Dissipated Power in Watts

5W 10W 15W 20W 25W 50W 75W 100W 125W 150W 175W 200W 250W 300W

EJB11 12 22 33 44 54

EJB21 6 11 16 21 26 51 75

EJB22 6 11 17 22 28 54 81

EJB23 3 5 8 10 12 24 35 46

EJB30 4 8 11 14 17 32 48 64

EJB31 4 6 9 11 14 26 39 51 64

EJB51 3 5 6 8 10 19 28 36 45 54 63

EJB63 2 4 5 6 8 15 21 28 35 42 49 55 69 82

EJB61 2 3 4 5 7 12 18 23 28 34 39 45 56 66

EJB71 2 3 3 4 5 9 14 18 22 26 30 34 43 51

EJB73 2 3 4 5 6 11 16 21 26 31 36 41 50 60

EJB91 2 2 3 3 4 7 10 13 15 18 21 24 30 35

EJB93 2 2 3 4 4 8 11 15 18 22 25 29 36 43

*Table shows approximate internal temperature rise above external ambient (°C)

EJB Threads Comparison Table



CODE DRILLING

AREA A-B

[mm]

QUANTITY ALLOWED ENTRIES FOR SIZE

(from 1 TO size 8)

DRILLING

AREA C-D

[mm]

QUANTITY ALLOWED ENTRIES FOR SIZE

(from 1 TO size 8) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

EJB11 125 x 60 4 2 2 1 1 - - - 125 x 60 4 2 2 1 1 - - -

EJB21 200 x 90 10 7 5 3 2 2 1 - 160 x 90 8 5 4 3 2 1 1 -

EJB22 215 x 130 15 11 8 6 6 3 2 1 110 x 130 9 5 5 4 2 1 1 1

EJB30 320 x 65 13 7 5 5 4 3 - - 225 x 65 9 5 4 3 3 2 - -

EJB31 320 x 150 28 18 14 11 8 6 3 2 225 x 150 20 12 9 8 6 5 2 1

EJB51 460 x 155 44 27 24 20 12 10 6 3 255 x 155 24 15 12 11 6 6 3 2

EJB61 550 x 250 72 50 36 32 21 21 14 8 350 x 250 48 30 24 20 12 12 8 6

EJB63 550 x 130 36 29 18 16 14 7 5 4 350 x 130 24 17 12 10 8 4 3 3

EJB71 600 x 270 78 55 50 36 32 21 18 10 400 x 270 48 35 35 24 20 15 12 6

EJB73 570 x 160 40 26 22 18 14 12 7 4 370 x 160 26 18 14 12 8 11 4 2

EJB91 745 x 290 112 84 65 55 40 28 23 14 440 x 290 70 42 35 35 24 18 13 8

EJB93 745 x 145 48 42 29 22 10 11 9 5 440 x 145 30 24 21 14 12 7 5 3

CODE DRILLING AREA E-F

[mm]

MAXIMUM NUMBER OF

OPERATORS PERMITED

SIZE UNI 6125 ISO 228/1 ASA B2.1 ISO 965/1

EJB-11 120 X 120 6 1 GK 1/2" G 1/2" 1/2" NPT M20

EJB-21 200 X 155 12 2 GK 3/4" G 3/4" 3/4" NPT M25

EJB-22 240 X 120 12 3 GK 1" G 1" 1" NPT M32

EJB-23 215 X 165 16 4 GK 1-1/4" G 1-1/4" 1-1/4" NPT M40

EJB-30 305 X 205 30 5 GK 1-1/2" G 1-1/2" 1-1/2" NPT M50

EJB-31 305 X 205 30 6 GK 2" G 2" 2" NPT M63

EJB-51 465 X 265 54 7 GK 2-1/2" G 2-1/2" 2-1/2" NPT M75

EJB-61 575 X 370 56 8 GK 3" G 3" 3" NPT M85

EJB-63 575 X 370 56

EJB-71 590 X 390 48

EJB-73 590 X 390 48

EJB-91 800 X 500 54

EJB-93 800 X 500 54



EJB Glass Windows on Cover

WINDOW

CODE

ENCLOSURE CODE WINDOW

DIMENSIONS

EJB-11 EJB-21 EJB-22 EJB-23 EJB-

30/31 EJB-51

EJB-

61/63

EJB-

71/73

EJB-91-

93 A [mm]

B

[mm]

F1 x x x x x x x x x 60 60

F2 - x x x x x x x x 75 75

F3 - x x x x x x x x 110 75

F4 - x x x x x x x - 150 75

F5 - - - - x x x - - 150 150

F6 - - - - - x x - - 300 75

F7 - - - - - x x - - 300 150

F8 - - - - - - x - - 300 300

F9 - - - - - - x - - 450 300


EJB Enclosures - Extronics · Extronics Limited 1 Dalton Way, Midpoint 18, Middlewich, Cheshire,...

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