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Drawer height (E = 25)
8E/4   1/4 unit  maximum rated current of 63A (MCCB 63 and below can be mounted)
8E/2   1/2 unit  maximum rated current of 100A (MCCB 100 and below can be mounted)
8E= 200MM  1 unit     maximum rated current 250A (MCCB 250 and below can be mounted)
12E= 300MM  1.5 units  maximum rated current of 630A (MCCB 630 and below can be mounted, to be used when there is not enough space, usually with two units)
16E= 400MM  2 units   maximum rated current of 630A (MCCB 630 and below can be mounted)
20E= 500MM  2.5 units  maximum rated current of 630A (MCCB 630 and below can be mounted)
24E= 600MM  3 units    maximum rated current of 630A (MCCB 630 and below can be mounted)
one-unit drawer with layer height at 200mm can be divided into 8E/4, 8 E/2, 8 E, 12E, 16E, 20E and 24E, the effective height of the cabinet is 72E, which can hold up to 9 layers of 36 1/4 unit outlet circuits.
The push-and-pull mechanism of the drawer is independent of the MCCB operating mechanism.
Effective mounting height of the cabinet: 200mmx9 layers = 1800mm
Drawer unit is provided with mechanical interlock device.
There are five standard sizes, with 8E (200mm) height as a benchmark:
8E/4: four drawer units installed in 8E.
8E/2: two drawer units installed in 8E.
8E: one drawer unit installed in 8E.
16E: one drawer unit installed in 16E (400mm).
24E: one drawer unit installed in 24E (600mm).
One cabinet can be installed a single type of these five types of drawer units or all these five types of drawer units can be installed in one cabinet. When one type of drawer unit is installed in a cabinet, the maximum number of drawer unit that can be held is shown in the table below.