The BLMT Aluminum Lug stands as a specialized connection solution for power equipment, engineered to deliver reliable performance in medium-voltage (MV) applications up to 42 kV.
BLMT
Mingxu
Constructed from high-purity aluminum alloy, this lug combines lightweight design with excellent electrical conductivity, making it ideal for terminating aluminum conductors in power transformers, switchgear, and distribution equipment. Its unique shear bolt design ensures consistent and uniform contact pressure during installation, eliminating the need for torque monitoring and reducing installation errors. Compliant with international standards and CE-certified, the BLMT Aluminum Lug provides a cost-effective alternative to copper lugs in applications where weight and material cost are critical considerations.
Fabricated from 1050/1350 aluminum alloy with a minimum purity of 99.5%, the lug achieves high electrical conductivity of ≥62% IACS while maintaining good mechanical properties. The aluminum material undergoes a special annealing process to reduce brittleness and improve formability during crimping.
A key innovation of the BLMT design is its integrated shear bolt mechanism, which features a predefined break point that fractures when the optimal torque is reached. This ensures consistent connection pressure across all installations, eliminating under-tightening or over-tightening issues common with conventional bolts.
The lug operates reliably within an extreme temperature range of -40°C to 100°C, making it suitable for both indoor equipment rooms and outdoor installations in diverse climatic conditions. Its thermal expansion characteristics are matched to aluminum conductors, minimizing thermal stress at connection points during load cycling.
The BLMT Aluminum Lug provides secure terminations for high-current leads in distribution transformers (10-42 kV), connecting transformer bushings to overhead or underground cables. Its lightweight design reduces mechanical stress on transformer terminals.
In medium-voltage switchgear and ring main units (RMUs), these lugs terminate incoming and outgoing feeder cables, ensuring low-resistance connections between cables and switchgear components. Their compact design fits easily within the confined spaces of switchgear enclosures.
Utility-scale solar and wind inverters utilize BLMT lugs for connecting aluminum DC output cables to inverter terminals. The shear bolt design simplifies installation in field conditions, ensuring consistent quality even with less-experienced personnel.
The shear bolt features a reduced-diameter section that breaks when the correct torque is applied (typically 25-45 Nm depending on size), leaving the optimal clamping force intact. This one-time operation guarantees proper installation without requiring torque measurement tools.
While primarily designed for aluminum conductors, BLMT lugs can be used with copper conductors if a suitable anti-oxidation compound is applied to the copper surface to prevent galvanic corrosion. For permanent copper-to-aluminum connections, a bimetallic lug is recommended.
Current ratings vary by size, ranging from 150A for 16 mm² lugs up to 630A for 240 mm² lugs under ambient temperature conditions (30°C). Derating factors apply for higher temperatures or enclosed installations, as specified in the product datasheet.
No, the shear bolt design is for one-time installation only. Once the shear bolt breaks, the lug cannot be re-tightened or reused. This ensures the integrity of the connection, as reusing would compromise the calibrated clamping force.
| ltem No. | Cross section (mm²) | Φ±0.3 | D±0.2 | d±0.2 | L±2 | L1±2 | No.of bolt |
| BLMT-25/95 | 25-95 | Φ13,Φ17 | 24 | 12.8 | 60 | 30 | 1 |
| BLMT-35/150 | 35-150 | φ13,Φ17 | 28 | 15.8 | 86 | 35 | 1 |
| BLMT-95/240 | 95-240 | Φ13,Φ17,Φ21 | 33 | 20.0 | 112 | 60 | 2 |
| BLMT-120/300 | 120-300 | Φ13,Φ17 | 37 | 24.0 | 115 | 65 | 2 |
Constructed from high-purity aluminum alloy, this lug combines lightweight design with excellent electrical conductivity, making it ideal for terminating aluminum conductors in power transformers, switchgear, and distribution equipment. Its unique shear bolt design ensures consistent and uniform contact pressure during installation, eliminating the need for torque monitoring and reducing installation errors. Compliant with international standards and CE-certified, the BLMT Aluminum Lug provides a cost-effective alternative to copper lugs in applications where weight and material cost are critical considerations.
Fabricated from 1050/1350 aluminum alloy with a minimum purity of 99.5%, the lug achieves high electrical conductivity of ≥62% IACS while maintaining good mechanical properties. The aluminum material undergoes a special annealing process to reduce brittleness and improve formability during crimping.
A key innovation of the BLMT design is its integrated shear bolt mechanism, which features a predefined break point that fractures when the optimal torque is reached. This ensures consistent connection pressure across all installations, eliminating under-tightening or over-tightening issues common with conventional bolts.
The lug operates reliably within an extreme temperature range of -40°C to 100°C, making it suitable for both indoor equipment rooms and outdoor installations in diverse climatic conditions. Its thermal expansion characteristics are matched to aluminum conductors, minimizing thermal stress at connection points during load cycling.
The BLMT Aluminum Lug provides secure terminations for high-current leads in distribution transformers (10-42 kV), connecting transformer bushings to overhead or underground cables. Its lightweight design reduces mechanical stress on transformer terminals.
In medium-voltage switchgear and ring main units (RMUs), these lugs terminate incoming and outgoing feeder cables, ensuring low-resistance connections between cables and switchgear components. Their compact design fits easily within the confined spaces of switchgear enclosures.
Utility-scale solar and wind inverters utilize BLMT lugs for connecting aluminum DC output cables to inverter terminals. The shear bolt design simplifies installation in field conditions, ensuring consistent quality even with less-experienced personnel.
The shear bolt features a reduced-diameter section that breaks when the correct torque is applied (typically 25-45 Nm depending on size), leaving the optimal clamping force intact. This one-time operation guarantees proper installation without requiring torque measurement tools.
While primarily designed for aluminum conductors, BLMT lugs can be used with copper conductors if a suitable anti-oxidation compound is applied to the copper surface to prevent galvanic corrosion. For permanent copper-to-aluminum connections, a bimetallic lug is recommended.
Current ratings vary by size, ranging from 150A for 16 mm² lugs up to 630A for 240 mm² lugs under ambient temperature conditions (30°C). Derating factors apply for higher temperatures or enclosed installations, as specified in the product datasheet.
No, the shear bolt design is for one-time installation only. Once the shear bolt breaks, the lug cannot be re-tightened or reused. This ensures the integrity of the connection, as reusing would compromise the calibrated clamping force.
| ltem No. | Cross section (mm²) | Φ±0.3 | D±0.2 | d±0.2 | L±2 | L1±2 | No.of bolt |
| BLMT-25/95 | 25-95 | Φ13,Φ17 | 24 | 12.8 | 60 | 30 | 1 |
| BLMT-35/150 | 35-150 | φ13,Φ17 | 28 | 15.8 | 86 | 35 | 1 |
| BLMT-95/240 | 95-240 | Φ13,Φ17,Φ21 | 33 | 20.0 | 112 | 60 | 2 |
| BLMT-120/300 | 120-300 | Φ13,Φ17 | 37 | 24.0 | 115 | 65 | 2 |
