A major innovation for the mining market developed by SPM Special Machine is the ATEX explosion-proof medium-voltage junction box rated at 20 kV.

This flameproof medium-voltage junction box is an enclosure designed for connecting and branching MV cables in hazardous areas (Zones 1, 2, 21, 22) where explosive atmospheres may be present, whether due to flammable gases, vapours, or combustible dusts.

The JBEXs junction box series from SPM Special Machine is ATEX-certified with Ex sb protection according to IEC 60079-33 (Special Protection “sb”).

They are built either in stainless steel for marine environments or in carbon steel with special coating for mining environments.

ATEX classification and main technical characteristics of the JBEXs 

II 2 G Ex sb IIC T6 Gb;  I M2 Ex sb I Mb  Ambient temperature range: −20 °C to +50 °C

Rated operational voltage: 20 kV

Highest system voltage: 24 kV

Frequency: 50/60 Hz

Rated current: up to 630 A

Unique advantageUnlike traditional medium-voltage junction boxes with Ex eb protection, which are typically limited to 11 kV, the JBEXs can be safely used at higher voltages, up to 20 kV.This capability represents a significant advancement for hazardous-area MV systems.

Thanks to these special features, the JBEXs is rapidly gaining popularity among SPM Special Machine customers especially for mining applications (category I M2), where operational voltages of 20 kV are commonly required.

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