Explosion-proof slip rings are electromechanical devices that allow the transmission of power, signals, or data between a fixed part and a rotating part, specifically designed and certified to operate in environments with an explosion risk caused by flammable gases, vapours, or potentially explosive mixtures.

They are essential in industries where even the smallest internal spark could trigger an explosion—such as chemical and petrochemical plants, refineries, offshore platforms, and marine cranes.

The company offers a complete range of explosion-proof slip rings, capable of covering a wide variety of requirements in terms of current ratings, number of electrical circuits, and data-transmission performance.Key advantages of SPM Special Machine explosion-proof slip rings compared to competitors 

• Low thermal power generated by the sliding electrical contacts;
• Current ratings up to 1200 A per active phase;
• Operating voltage up to 20 kV;
• Modular ring configuration for power, auxiliaries, digital/analog signals, data, and even fiber-optic transmission (FO-Ring), with a total number of rings up to 200 ;
• Very compact Ex db enclosures, treated with dedicated protective coatingsExplosion-proof classification of the SREX series (SREX150 / SREX300 / SREX506 / SREX690);
• Ex d → flameproof enclosure (gas)* Gas group: IIB* Temperature classes: T4 / T5;
• Certification schemes: ATEX / IECEx.

The main strength of the SREX explosion-proof slip ringsThe excellence of the SREX series lies in the innovative sliding contacts, patented by SPM Special Machine.

These ring-and-brush assemblies are manufactured using high-quality materials, engineered to withstand harsh environments such as marine and mining applications, and feature very low thermal power dissipation, allowing their integration into extremely compact Ex d enclosures.

All these technical solutions are highly appreciated by SPM Special Machine customers during installation and operation in their plants.

SPM Special Machine Srl – Collettori rotanti elettrici e avvolgicavo