Medium voltage (MV) underground deadbreak distribution systems are the core backbone of urban underground power grids, substation interconnection, and large-scale renewable energy microgrids. Traditional compression lugs require bulky hydraulic crimping tools, often suffer inconsistent crimp pressure, hidden hot spots and high on-site construction costs. Meanwhile, standard bolted terminals lack calibrated torque control, leading to loose contacts after long-term thermal cycling and underground soil vibration. Jera Line founded in 2012, independently developed full-series deadbreak stepless shear bolt lugs, separable connector and underground cable termination projects. Adopting stepless double shear-head bolt design and concentric palm structure, these lugs deliver standardized torque locking, bimetallic compatibility and full IEC international certification. This blog will introduce product definition, unified technical specifications, core structural advantages, typical MV underground application scenarios and comprehensive supplier strengths of cooperating with Jera Line for deadbreak shear bolt lug procurement.
Jera Line deadbreak stepless shear bolt lugs are utility-grade mechanical cable terminals exclusively optimized for MV deadbreak separable connector systems, fully compliant with IEC 61238-1 testing criteria. Different from ordinary single-bolt mechanical lugs, Jera Line deadbreak stepless lugs adopt symmetric dual stepless shear-off brass bolts mounted on both sides of the tin-plated aluminum alloy barrel, realizing uniform circumferential compression on cable conductors without local stress concentration.
The integrated concentric palm design ensures precise fitting with deadbreak elbow inner cavities, eliminating assembly gaps that cause partial discharge inside underground insulated components. The barrel inner wall features precision serrated contact grooves filled with factory anti-oxidation conductive grease, which automatically fits solid, stranded and sector-shaped aluminum or copper conductors without pre-stripping special transition sleeves. Calibrated shear-head nuts break at factory preset torque value once fully tightened with a standard hex wrench, completely eliminating human errors of under-tightening or over-compression that damage cable strands.
The whole body adopts high-conductivity aluminum alloy with thick tin plating to block electrochemical corrosion between Al and Cu cables. All Jera Line deadbreak stepless shear bolt lugs complete full routine and type tests in the factory ISO/IEC accredited laboratory, with third-party test reports available for global MV underground grid tender and EPC project qualification submission.
Technical Specification:
| Product code | Cable size, mm² | Bolt Number | Application cable |
|---|---|---|---|
| CLBVzT-36-2.S(H)-70-240 | 70-240 | 2 | Copper/Aluminum |
| CL-2K-VzT-36-2.S(H)-70-240 | 70-240 | 2 | Copper/Aluminum |
| CLB-P-VzT-36-2.S(H)-70-120 | 70-240 | 2 | Copper/Aluminum |
Jera Line deadbreak stepless shear bolt lugs adopt tin covering body, copper shear bolts and factory pre-filled anti-oxidation conductive grease. Each production batch can provide complete dimensional inspection, tensile strength, to meet overseas power project tender document requirements.
Certified to international standards, reinforcing Jera's commitment to quality and global acceptance.
Single-bolt mechanical terminals only provide unilateral clamping force, which easily shifts inside deadbreak elbow during underground thermal expansion and contraction. Jera Line's symmetric dual shear bolt structure distributes compression evenly around the full cable circumference. Lab long-cycle vibration and thermal shock tests verify consistent ultra-low contact resistance after 1000 temperature alternating cycles, drastically eliminating hot-spot overheating risks hidden in underground deadbreak cable joints. No professional torque wrenches or hydraulic crimp tools are required on site, cutting construction tool investment by over 60% compared with compression lug solutions.
Thick tin-plated aluminum alloy body forms an isolation buffer layer between aluminum trunk cables and copper equipment terminals, fundamentally blocking galvanic corrosion that causes joint aging in humid underground soil environments. Contractors only need one complete Jera Line deadbreak lug series to finish mixed aluminum-copper underground deadbreak connection projects, simplifying inventory classification and avoiding wrong model selection delays on construction sites.
Installation is possible with standard 13 mm / 17 mm socket wrenches, empowering field crews to work faster and safer without heavy crimping equipment.
Seamlessly integrates with deadbreak elbows, junctions, and switchgear terminations, making Jera lugs a trusted choice for MV system operators.
By removing crimping errors and die selection issues, Jera ensures consistent performance across projects, reducing maintenance costs and downtime.
Jera Line deadbreak stepless lugs mainstream 70-240 mm2 MV underground feeder cables, forming a one-stop size matching solution for full-range deadbreak separable connector termination demands from 1kV to 36kV power systems.
Jera's barrel and bolt design deliver superior pull‑out resistance and withstand short‑circuit stresses, supporting the reliability goals of modern utilities.
Jera Line's Deadbreak stepless shear bolt lug CLB-P-VzT-36-2.S(H)-70-240 series is the dedicated matching terminal for 15kV, 25kV, 36kV deadbreak elbow and separable tee connectors, widely used urban underground ring main unit (RMU) feeder cable deadfront connection, realizing fully insulated live-line maintenance without digging cable trenches.
Perfect for transformer cabinet, ring main unit and switchgear buried cable deadbreak interface connection, solving the problem of frequent joint loosening caused by equipment vibration and seasonal soil temperature changes in substation underground cable channels.
Adapt to rooftop and ground PV station buried MV cable deadbreak junctions, stably transmit fluctuating new energy current under frequent outdoor temperature alternation, avoiding thermal aging failure of traditional compression lugs after long-term variable load operation.
Stepless cable lugs buried low-voltage deadbreak junction boxes and heavy-load underground trunk cables, supporting stable power supply for production equipment with long-term underground moisture resistance performance.
Most rural and old city grid reconstruction adopts large-section aluminum underground ABC cables; Jera Line double shear bolt balanced clamping solves the loose contact defect that frequently occurs when ordinary single-bolt lugs are applied on oversized aluminum conductors inside deadbreak buried components.
Benefits of partnering with Jera Line include:
Founded in 2012, Jera Line owns complete CNC precision machining, alloy die-casting and surface tin-plating production lines. All deadbreak lug molds are independently developed by in-house electrical engineering teams, removing intermediate trader markup to provide competitive bulk factory pricing for global grid EPC contractors and distributors. Standard deadbreak lug models maintain permanent raw material stock, guaranteeing stable 7-15 working day mass delivery cycles to solve long lead-time shortages of imported deadbreak terminals.
We provide one-stop personalized modification services including laser customer logo embossing on lug palm, custom palm hole diameter adjustment, torque parameter fine-tuning and special-size mold development to match different country EN/IEC deadbreak equipment specifications. Free engineering test samples are offered for underground project performance verification, with low minimum order quantities for small trial bulk orders unavailable from international original brand suppliers.
Jera Line's on-site testing lab is equipped with tensile strength testers, temperature rise cycling cabinets, salt spray corrosion chambers and dielectric water bath withstand testing machines. Every batch of deadbreak shear bolt lugs completes raw material alloy composition inspection, dimensional tolerance verification, shear torque calibration and underground moisture aging test before shipment. All products carry a 5-year factory quality warranty, providing free replacement for non-artificial manufacturing defects.
Our LV/MV cable accessory products have been exported to more than 60 countries across Europe, Africa, Southeast Asia and the Middle East. Multilingual foreign trade team fully masters local underground deadbreak grid standards, tender document requirements and cross-border customs clearance procedures, providing one-stop technical guidance from model selection to post-construction after-sales support for clients switching from imported deadbreak lugs to Jera factory alternatives.
Besides full-series deadbreak shear bolt lugs, Jera Line manufactures matching insulation piercing connectors, overhead tension clamps, surge arresters and full set deadbreak elbow rubber separable components. Clients can purchase all required underground deadbreak grid hardware from a single manufacturer, reducing multi-supplier communication costs and integrated international logistics expenses.
For medium and low voltage underground deadbreak power distribution projects requiring long-term stable conductive performance, underground anti-corrosion durability and standardized tool-free installation, Jera Line deadbreak stepless shear bolt lugs deliver a comprehensive upgrade compared with traditional hydraulic compression lugs and ordinary single-bolt mechanical terminals. With balanced dual shear bolt clamping, universal copper-aluminum bimetallic compatibility, full IEC-61238 international standard certification and direct factory cost advantages, this product lineup has become the preferred deadbreak termination solution for global power distributors, underground grid EPC contractors and photovoltaic new energy integrators.
If you are sourcing reliable, interchangeable deadbreak stepless shear bolt lugs for urban buried grids, substation equipment or distributed PV underground deadbreak systems, feel free to contact the Jera Line technical team to apply for free test samples.
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