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Knowledge about Power Distribution Block, Terminal Block

Time:2023-10-19   Author:As Beam   Browse:

What is a power distribution block


The purpose of a Power distribution block is straightforward: it serves as a connector, simplifying the process of connecting wires. Essentially, it consists of a metal piece enclosed in insulating plastic, featuring holes at both ends for inserting wires. Screws are utilized to tighten or loosen the connections, allowing wires to be easily joined or disconnected without the need for welding or wrapping. This method is not only convenient but also rapid.



Power distribution blocks are essential accessories used to establish electrical connections and are categorized as connectors within the industry. With the increasing levels of industrial automation and the rising demands for precise industrial control, the need for Power distribution blocks has grown significantly. The expanding electronics industry has led to a wider variety of Power distribution blocks, including WUK Power distribution blocks, European Power distribution blocks block series, plug-in Power distribution blocks block series, transformer Power distribution blocks, building wiring Power distribution blocks, fence Power distribution blocks block series, spring Power distribution blocks block series, track Power distribution blocks block series, through-wall Power distribution blocks block types, photoelectric coupling Power distribution blocks block series, as well as specific numbered Power distribution blocks like 110, 205, 250, 187, OD2.2 ring Power distribution blocks, 2.5 ring Power distribution blocks, 3.2 ring Power distribution blocks, 4.2 ring Power distribution blocks, 2 ring Power distribution blocks, 6.4 ring Power distribution blocks, 8.4 ring Power distribution blocks, 11 ring Power distribution blocks, 13 ring Power distribution blocks, and various flag series Power distribution blocks and sheath series. Additionally, there are different types of ring Power distribution blocks, tubular Power distribution blocks, wiring Power distribution blocks, copper strips, and iron strips (such as 2-03, 4-03, 4-04, 6-03, 6-04). Among these, PCB board Power distribution blocks, hardware Power distribution blocks, nut Power distribution blocks, and spring Power distribution blocks are currently the most commonly used varieties. Due to the diverse applications of Power distribution blocks, the editor of Polaris Power Transmission and Distribution has compiled and organized relevant knowledge about Power distribution blocks for your convenience.

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The quality of a Power distribution blocks block is intricately linked to its plastic insulation material and conductive parts. These components determine the insulation and conductive performance of the Power distribution blocks respectively. Any failure in a Power distribution blocks can result in the failure of the entire system project. Given the critical nature of these components, there have been numerous cautionary instances. Although listing each case is unnecessary, it is vital to note that customers consistently prioritize the quality of motion control Power distribution blocks. Therefore, effective inspection and prevention methods have become a significant area of concern in the industry.

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What is the most common issue with power distribution block?

From a usage perspective, Power distribution blocks must fulfill specific functions to ensure their effectiveness. These functions primarily revolve around achieving reliable conductivity and insulation. There are three common fatal fault forms associated with Power distribution blocks:



Poor Contact:

The metal conductor within the Power distribution blocks block is essential for transmitting voltage, current, or signals from external wires to the corresponding connector contacts. To achieve this, contacts must possess excellent structural integrity, stable and reliable contact retention, and good conductivity. Issues like unreasonable structural design, incorrect material selection, unstable molds, out-of-tolerance processing dimensions, rough surfaces, improper surface treatments, assembly errors, poor storage conditions, and improper usage can damage contact parts and mating components, leading to poor contact.


Poor Insulation:

The insulator's function is to maintain proper positioning of the contacts while insulating them and the housing from each other. Insulation parts must exhibit excellent electrical, mechanical, and forming properties, especially with the prevalent use of high-density, miniaturized Power distribution blocks. As insulators become thinner due to these design trends, stringent requirements for insulation materials, injection mold accuracy, and molding processes are necessary. Issues such as excess metal, surface contaminants, moisture, organic material deposits, and harmful gas absorption films can create ionic conductive channels within the insulator. These factors contribute to short circuits, leakage, breakdowns, low insulation resistance, and other insulation-related problems.

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Poor Fixation:

Insulators not only insulate but also provide precise centering and protection for protruding contacts. They are crucial for installation, positioning, and locking on equipment. Inadequate fixation can impact contact reliability, leading to instantaneous power outages or, in severe cases, product disintegration. Disassembly problems arise from abnormal separations between plugs and sockets, or between pins and jacks. This occurs due to unreliable structural elements related to materials, design, and processes during Power distribution blocks block usage. Poor fixation can result from flawed design, incorrect material selection, inappropriate molding processes, subpar heat treatment, molds, assembly, or welding quality, as well as insufficient assembly efforts.

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Furthermore, poor Power distribution blocks block appearance due to issues like coating peeling, corrosion, bruises, plastic shell flash, cracks, rough processing of contact parts, and deformation can stem from inadequate positioning and locking fit dimensions, inconsistent processing quality, and excessive total separation force. Faults leading to poor exchange are also common and can typically be detected and resolved during inspection and usage. Vigilant monitoring and proper usage are crucial to prevent and rectify these Power distribution blocks block issues.


How to detect power distribution blockshort circuit fault?


When diagnosing issues related to wires and Power distribution blocks, it's important to consider the possibility of a short circuit within the wiring harness or relevant switches. Here are the steps you can follow during inspection:


Check the Continuity of Wires:

Start by removing the wiring Power distribution blocks on both sides of the control computer ECU and sensor. Measure the resistance between the corresponding Power distribution blocks of the removed wires. If the resistance value is not greater than 1 ohm, it indicates that the wire is functioning normally for the next step of inspection. To enhance measurement accuracy, gently shake the wire in both vertical and horizontal directions. Note that while measuring wire Power distribution blocks, insert the multimeter rod from the back end of the connector. For waterproof Power distribution blocks with covers, be careful during insertion to avoid Power distribution blocks deformation.



Check the Resistance Value for Short Circuit:

Remove the wire Power distribution blocks on both sides of the control computer ECU and sensor. Measure the resistance value between each Power distribution blocks block of the connector on both sides and the vehicle body. Ground one end of the meter rod to the car body and measure the wire connectors on both sides. If the resistance value is greater than 1 ohm, it indicates there is no short circuit fault between the wire and the car body.


Inspect Power distribution blocks Appearance and Contact Pressure:

Remove each Power distribution blocks one by one and inspect the connector Power distribution blocks for rust or dirt. Clean any rust or dirt found. Check whether the Power distribution blocks piece is loose or damaged and ensure that the Power distribution blocks are securely fixed. There should be no looseness in the Power distribution blocks when gently pulled. If a plug Power distribution blocks in any socket hole is easier to pull out than others, it may cause poor contact during usage and needs attention.


By following these steps and conducting a thorough inspection, you can effectively identify and address issues related to wires and Power distribution blocks, ensuring the proper functioning of the electrical system.


How to test power distribution block function?


To ensure the quality and reliability of Power distribution blocks and prevent potential issues, it is essential to establish stringent screening protocols. The following targeted reliability inspections are recommended to prevent failures:


1. Prevent Poor Contact:


Continuity Detection: Manufacturers should incorporate 100% point-by-point continuity detection in key product models, even though it's often not part of standard acceptance tests. Users frequently perform continuity testing after installation.


Instantaneous Break Detection: Some Power distribution blocks operate in dynamic vibration environments. Static contact resistance alone doesn't ensure reliable contact under dynamic conditions. Conducting a 100% dynamic vibration test on Power distribution blocks with high reliability requirements is advisable to assess contact reliability.


Single Hole Separation Force Detection: Measure the separation force of single holes to ensure that it is sufficient. Inadequate separation force might cause signal interruptions during vibration and impact loads. Manufacturers should implement 100% point-by-point inspection of finished products to prevent signal interruptions caused by loose jacks.




2. Prevent Poor Insulation:


Insulation Material Inspection: The quality of raw materials significantly influences insulator insulation performance. Select materials from reputable manufacturers and meticulously verify batch numbers, material certificates, and other crucial information to ensure high-quality materials are used.


Insulator Insulation Resistance Inspection: Implement 100% process screening on insulator parts to guarantee qualified electrical performance. Inadequate insulation resistance led to scrapping entire batches of products in the past, emphasizing the importance of rigorous inspections.



3. Prevent Poor Fixation:


Interchangeability Check: Conduct dynamic checks to ensure matching plugs and sockets within the same series can mate and connect correctly. Verify that insulators, contacts, and other parts are within tolerance and assembled correctly to avoid disintegration under rotational force. Additionally, inspect for any metal excess affecting insulation performance during plug-in and pull-out connections, such as threads and bayonet connections. For critical purposes, inspect 100% of Power distribution blocks to prevent major failures.


Endurance Moment Check: Utilize endurance moment inspections to assess the structural reliability of Power distribution blocks. Compliance with standards, like the U.S. military standard MIL-L-39012, ensures timely detection of problems.


Pass Test of Crimped Wires: Verify the secure attachment of crimped wires. Thoroughly test all mounting holes in delivered plug samples to simulate crimped wires with pins or jacks. Check whether they can be securely locked, ensuring compliance with product technical specifications, including assessing the pull-off force of each crimped wire.


Power distribution blocks are foundational components in any system engineering. Reliable Power distribution blocks are essential for overall system reliability. By implementing rigorous preventive measures and analyzing failure modes, manufacturers can eliminate hidden dangers, gain valuable insights, and improve design, process, inspection, and usage. These practices provide crucial technical support for developing and revising Power distribution blocks block technical conditions, ultimately preventing unnecessary losses.




What does a power distribution block do?


Power distribution blocks are used in branch circuit applications to connect 2 or more circuits together, thus preventing dangerous wire splicing. Power distribution blocks centralize and consolidate your control panel wires and cables and can also take primary power then dividing it among secondary circuits.


How to wire a power distribution block?


Power distribution block Recommendation(Bussmann, Phoenix, Socomec, TE, Littelfuse)


PDBFS power distribution blocks, UL standard open blocks, Power terminal blocks.

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Power distribution blocks UL / IEC, 0-380A, aluminum or copper


Phoenix Contact:

PTFIX distribution blocks,



DBL Series Power Distribution Blocks



LPBC - Electrical Power Distribution Blocks

GDB Series

LCH Series

LS Series

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FSPDB Series UL 1059 Finger-Safe Power Distribution Blocks

MPDB Series UL 1953 Open-Style Power Distribution Blocks

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New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc. 

TAG:   Power Distribution Block Bussmann