When it comes to medium-voltage and low-voltage electrical installations, the reliability of connectors is critical. Among these, shear head lugs with concentric palms are widely used for terminating conductors in power systems. But have you ever wondered why these lugs are tested under the IEC 61238 standard? Let’s break it down.
Shear head lugs with concentric palms are mechanical cable connectors designed for medium-voltage (MV) and low-voltage (LV) applications. They use shear-off bolts to ensure correct tightening torque and feature a concentric (symmetrical) palm for secure, uniform connection to equipment such as transformers, switchgear, and busbars.
A unique feature of mechanical shear head lugs is the shear bolt mechanism. When the bolt is tightened, the head shears off at a predetermined torque, ensuring that the connection is neither over- nor under-tightened. This guarantees consistent electrical and mechanical performance, which is essential for safety and reliability.
IEC 61238-1 is the international standard titled:“Compression and mechanical connectors for power cables for rated voltages up to 36 KV.”It defines the performance requirements, test methods, and acceptance criteria for mechanical and compression connectors used in low- and medium-voltage networks — including shear head lugs, mechanical connectors, and terminals.
It focuses on verifying that a connector can survive:
Shear head lugs are mechanical connectors that rely on controlled torque installation. The shear bolt head breaks off at a predefined torque to ensure consistent contact pressure. This makes them fast and reliable to install — but only if the product is properly designed and tested.
IEC 61238-1 is the only international standard that fully evaluates these characteristics through comprehensive type testing.
Jear Line is an experienced manufacturer of mechanical cable connectors and accessories for LV and MV power networks. All shear head lugs with concentric palm are developed with a strong focus on:
From raw material selection to final inspection, each product is manufactured under strict quality control,the Central palm lug CLB-P-Vz-36 series are designed and tested according to IEC 61238-1, the international standard for compression and mechanical connectors for power cables.
Technical Specification:
|
Product code |
Cable size,mm2 |
Number of bolts |
|
16-95 |
2 |
|
|
25-150 |
2 |
|
|
70-240 |
2 |
|
|
120-300 |
2 |
Features
Typical Applications:
Jera Line is a direct factory based in China, committed to providing high-quality, cost-effective Shear Head Lugs for the electrical market. Having worked in this industry for over ten years, Jera Line has the following advantages:
Jera Line is a direct factory based in China which can offer high cost-performance ratio products, help you save the budget while getting high-qulity goods.
Jera Line’s in-house lab handles the development and testing of Shear Head terminal Lugs, ensuring they meet performance reliability and mechanical strength requirements as specified in standards such as IEC61238.
Backed by a team of seasoned engineers and workers, Jera Line guarantees consistent product quality and high production efficiency. The company also utilizes software to manage the production process, enabling orderly manufacturing.
At Jera Line, we prioritize maximizing product quantity while minimizing empty space in your orders. We also offer packaging volume estimates prior to order placement. Thanks to our standardized factory packaging, you can place orders with a lower minimum order quantity (MOQ).
Jera Line has established business relationship with more than 30 countries,and received good feedback from customers on quality.With years of export experience, we understand international standards and customer requirements quite well.
Choosing Jera Line as your supplier of shear head lugs with concentric palm means partnering with a manufacturer committed to quality, reliability, and compliance with international standards. With proven experience in power network accessories, strict quality control, and products designed for safe and efficient installation, Jera Line delivers solutions you can trust.
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