Volsun MPRS Series Busbar Heat Shrink Tubing - FAQ

1. What is the primary function of Volsun MPRS series busbar heat shrink tubing?

The MPRS busbar heat shrink tube series is made from radiation crosslinked polyolefin to provide robust electrical insulation and reduce phase spacing. It is essential for protecting busbars in switchgear while enabling more compact cabinet designs by shortening the minimum safety distance between systems.

2. Which voltage levels does the Volsun MPRS series cover?

We offer three specialized series: MPRS-1KV for low-voltage slots, MPRS-10KV for medium-voltage switchgear, and MPRS-35KV for high-voltage equipment and indoor substation insulation.

3. What are the core material advantages of this tubing?

The heat shrink tubing is halogen-free, soft, and high-strength, featuring excellent resistance to electric carbon marks. Its radiation-crosslinked structure ensures stable performance across an operating temperature range of -55C to 125C.

4. How does the MPRS series contribute to space optimization?

With a breakdown strength of more than 20kV/mm, our tubing provides superior dielectric protection compared to air. This allows engineers to significantly reduce phase-to-phase and phase-to-ground clearances, leading to smaller, more cost-effective cabinet footprints.

5. What is the heat shrink ratio and how does it benefit installation?

The series features a consistent 2:1 shrink ratio, ensuring a tight, uniform fit over both standard rectangular bars and complex geometries like L-bends or T-junctions without slipping or cracking.

6. What are the recommended shrinking temperatures for the MPRS series?

The 1kV series begins shrinking at 70C, while the 10kV/35kV series starts at 84C. Full recovery is achieved at 120C, making it compatible with standard industrial heat guns or ovens.

7. Is Volsun busbar tubing environmentally compliant?

Yes, all MPRS products are strictly RoHS compliant and halogen-free, meeting modern low-smoke safety requirements for indoor power distribution environments.

8. What color options are available for phase identification?

Standard colors include red, yellow, and green for A-B-C phase coding. Black, white, and blue are also available for specific series, and we provide customization for other project-specific colors.

9. How does the tubing perform under extreme thermal stress?

It is designed to withstand harsh conditions, passing thermal shock tests at 250C (1kV) and 130C aging tests (10kV/35kV) without showing cracks or flaws, ensuring reliability during power surges.

10. Does the material maintain its strength after long-term aging?

Even after 168 hours of thermal aging at 130C, the MPRS series maintains a tensile strength of more than 6.9MPa and elongation at break of more than 100%, proving its long-term durability in the field.

11. What is the size range for different busbar specifications?

We provide a wide range of diameters from Φ8.0mm to Φ180.0mm, covering everything from small connectors to large industrial busbars for 35kV systems.

12. Is the MPRS series resistant to electrical tracking?

Yes, the material is specifically engineered for resistance to electric carbon marks (tracking), which is a vital safety feature for preventing flashovers in medium and high-voltage indoor environments.

13. How much does the length change during the shrinking process?

The axial rate of change is tightly controlled within 8% according to ASTM D 2671 standards, allowing for high precision during cutting and ensuring full coverage of the busbar.

14. Can MPRS tubing protect against animal-induced short circuits?

Beyond electrical insulation, it serves as a physical shield that prevents catastrophic short circuits caused by birds, snakes, or rodents entering the switchgear cabinet.

15. How should I select the correct MPRS model for my application?

Selection is based on your system's rated voltage and the dimensions of your busbar. We recommend consulting our technical size chart to match the expanded and recovered wall thicknesses to your specific insulation requirements.