SREX690: High-Performance ATEX/IECEx Slip Ring for Hazardous Areas

In heavy industry, oil & gas, and offshore applications, ensuring continuous power transmission to rotating equipment is not only a technical necessity — it is a strategic requirement for safety and productivity.

Within this context, the SREX690 stands out as an ATEX/IECEx certified slip ring developed by SPM Special Machine Srl, an Italian company specialized in the design and manufacturing of high-performance slip rings for harsh and demanding environments.

A Company Founded on Technical Expertise

SPM Special Machine Srl was founded by Ilir Biba, Saverio Anzelmo and Artur Biba, professionals with extensive experience in the electromechanical sector and in the design of solutions for complex industrial applications.

The founders bring together strong backgrounds in:

• Electrical engineering design
• Industrial mechanical engineering
• Project management for regulated markets such as oil & gas and ATEX/IECEx environments

Their shared vision was to create a company capable of combining:

• High manufacturing quality
• Advanced technical customization
• International regulatory compliance
• Fast decision-making and engineering flexibility

This engineering-driven entrepreneurial approach is clearly reflected in products such as the SREX690.

What Is a Slip Ring and Why It Is Essential

A slip ring is an electromechanical device that enables the continuous transmission of:

• Electrical power
• Control signals
• Analog, digital and fiber optic data

between stationary and rotating parts of a machine, without restricting motion or interrupting operation.

Slip rings are essential components in:

• Cranes and lifting systems
• Rotary tables
• Drilling rigs
• Mining machinery
• Offshore and petrochemical systems

SREX690: Power, Safety and Reliability

The SREX690 is specifically designed for high electrical power applications and potentially explosive atmospheres.

Electrical Performance

• Rated current up to 2000 A
• Rated voltage up to 24 kV
• Customizable configurations: SREX690, SREX691, SREX692, SREX693, SREX694
• High short-circuit current withstand capability up to Icc = 60 kA

Innovation in Sliding Contact Technology

A key innovation introduced by SPM Special Machine concerns the sliding contact system between ring and brush.

Significant R&D investment has led to a contact solution that is:

• Mechanically robust
• Electrically safe
• Capable of withstanding high short-circuit currents

Unlike traditional carbon-graphite sliding contacts, where short-circuit capability is typically limited (Icc approximately 2–3 times the rated current In), the SREX690 provides substantially higher short-circuit resistance, improving overall safety and operational reliability.

These characteristics make it ideal for high-power industrial plants and complex machinery requiring superior material reliability and electrical performance.

ATEX / IECEx Certifications and IP66 Protection

The SREX690 is designed with:

• Ex db protection method
• IP66 enclosure rating
• ATEX certification: II 2G Ex db IIB T5 Gb
• IECEx scheme: Ex db IIB T5 Gb
• Mining certification: I M2 Ex db I Mb

The unit complies with international standard IEC 60079-1, ensuring safe operation in potentially explosive atmospheres.

Why Choose the SREX690?

In critical industrial environments, unplanned downtime leads to significant financial losses. A slip ring must guarantee:

✔ Continuous operation

✔ Resistance to dust, moisture and aggressive agents

✔ Long-term electrical stability

✔ Reduced maintenance requirements 

✔ Compliance with international regulations

The SREX690 has been engineered specifically to meet these demanding requirements.

SPM’s Approach: Tailor-Made Engineering

One of the key strengths of SPM Special Machine Srl is its customization capability. Each slip ring can be configured according to:

• Number of rings
• Power loads
• Auxiliary circuits
• Installation method
• Specific environmental conditions

This engineering approach ensures perfect integration of the device into the customer’s system.

Conclusion

The SREX690 represents a technologically advanced solution for power transmission in complex and explosion-hazard environments.

High electrical capacity, certified safety, and robust construction make it a strategic choice for industries where reliability and operational continuity are non-negotiable.

If you would like, I can also prepare a more commercial sales-oriented version or a highly technical datasheet-style version suitable for international tenders.

www.spm-slipring.it