This section provides an overview for junction boxes as well as their applications and principles. Also, please take a look at the list of 55 junction box manufacturers and their company rankings.
Table of Contents
A junction box is a device that collects the electricity generated by each solar panel and sends it to the power conditioner. Each solar panel block is connected in series with a diode to prevent reverse current, etc., and the power conditioner collects the power generated by each solar panel in the block into the junction box. The power conditioner converts the generated DC current into AC current.
Each block is wired to a device called a switchgear in the junction box. The switchgear has a switch function like a distribution board breaker, so it can check the flow of electricity.
Junction boxes are used to aggregate electricity generated by photovoltaic power generation systems.
Because they are often installed outdoors, installers place them in locations that are protected from rain, such as under roof sheds, or on exterior walls where they can be easily maintained.
Junction boxes are available in outdoor and indoor versions. The outdoor version is waterproof, which increases the cost. On the other hand, installation of indoor junction boxes requires a large amount of wiring from the solar panels to the interior, so large holes must be drilled into the exterior wall.
A single circuit consisting of the positive and negative poles of multiple solar panels connected in series by PV cables is called a string. Generally, a string consists of 20 solar panels. The junction box contains small breakers corresponding to the number of panels in the string, and multiple small breakers are wired to a single placer. Multiple thin PV cables can be combined into one thick PV cable and routed to the power conditioner via the junction box. If multiple PV cables are all routed in series to the power conditioner without using junction boxes, power may be lost due to voltage drop. Also, the thin PV cables that make up a string are not suitable for long-distance wiring.
By installing a small breaker for each string, only the necessary parts of the system can be accessed for inspection and maintenance without having to turn off all power. The same applies when replacing parts such as solar panels.
To prevent equipment failure in the event of lightning strikes, lightning protection elements and other devices are built in.
*Including some distributors, etc.
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ABB E-mobility provides electric vehicle charging solutions for customers around the globe. ABB E-mobility offers DC fast chargers as well as AC chargers with focus on reliability and uptime. Since 2010, ABB E-mobility has sold over 50,000 DC fast chargers and over 1 million total AC chargers. ABB E-mobility offers home single and multi-charge units, retail, workplace, and hospitality charge units, electric vehicle fleet sales, as well as public transportation. Additionally, numerous digital solutions and software services are available.
Devar Inc. is headquartered in Bridgeport, Connecticut. Devar Inc. is a designer and manufacturer of industrial control and measurement devices for several industries including electromechanical manufacturing. Devar products are made in the United States and its factories are ISO 9001:2015 certified. Devar’s product categories include level and pressure including transducers and transmitters, pump controllers, loop powered indicators, signal isolators and converters including AC current transmitters and isolated signal conditioners, panel meters, alarms, and temperature transmitters.
Strainsert began in 1960 and is headquartered in Conshohocken, Pennsylvania. Stransert is a designer and manufacturer of sensors used in research, testing, weighing, and control applications used in aerospace, automotive, marine, and other industrial applications including deep sea and Mars rover expeditions. Strainsert is AS9100 certified. Strainsert’s product lines include force sensing pins and bolts, flat load cells, force sensing tension links, and force measurement systems and instruments. Strainsert also offers a full range of calibration, repair, technical, and engineering services.
Carolina Scales is located in West Columbia, South Carolina. Carolina Scales is a distributor of equipment for and service provider for scale calibration and certification. Carolina Scales is ISO/IEC 17025 accredited. Carolina Scales product division includes truck/portable vehicle scales, weight indicators, load cells/weigh modules/junction boxes, floor scales, bench scales, counting scales, check weighers, balances, used scales, crane scales/hanging scales, remote displays/scoreboards, lift truck scales, printers, scanners, medical & health scales, retail scales, belt scales/conveyor scales, railroad, and agricultural scales. Services include scale testing and calibration and equipment rentals.
Tacuna Systems was founded in 2011 and centered in Golden, Colorado. Tacuna Systems provides in-house custom designs for signal conditioners, amplifiers, and other strain gauge load cell technology used across numerous industries. Tacuma Systems’s load cell products include load pins, planar beams, tension links, torqure transducers, load cell kits, and load cell calibration services. Additional products include calibration weights, scale parts and accessories, summing junctions, and other hardware, accessories, and wireless components. Tacuna Systems also provides services including load measurement consulting, system calibrations, custom signal conditioning & electronics, and custom scale design.
ARCO Engineering was founded in Louisville, Kentucky in 1954. ARCO Engineering, Inc. is a distributor of Pressure, Temperature and Liquid Level instruments, instrument valves, heat trace, comfort heaters, and safety relief valves. ARCO Engineering specializes in products for the natural gas, process, chemical, power, wastewater and OEM markets. ARCO Engineering offers many types of parts including calibration instruments, hand valves, thermocouples, digital meters, drive pressure gauges, respirators, jet pumps, and pressure relief valves.
Supply Solutions was founded in the early 2000s and operates out of Stonewood, West Virginia. Supply Solutions is a wholesale distributor serving the telecommunications industry, including traditional CATV operators, independent telephone companies and FTTX providers, as well as the contractors that support these operations. Supply Solutions offers hardware including aerial hardware including sub-components and parts,, cables, conduits, fiber optics, power supplies, sealants, test equipment, drop & instillation products, FTTX equipment including optical enclosures, headend products, underground equipment, wireless equipment, poles, as well as test equipment.
Kinequip, Inc. was founded in 1946 in Buffalo, NY as a distributor of industrial parts, accessories, and kits. Today these offerings have grown to include motors, compressors, blower systems, clams, pumps, various fittings, gauges, and sensors, as well as pneumatic and high-pressure devices. Kinequip also serves as a distributor for individual device and parts manufacturers. Kinequip additionally offers custom-designed solutions ranging from R&D to unique components and special-made parts, as well as value added designs on demand.
The Rowland Company was founded in 1732 in Philadelphia, Pennsylvania when Benjamin Franklin was just 25 years old. Today the Rowland Company specializes in the distribution, fabrication, and assembly of industrial power transmission products, including application engineering, and modification of products to customer needs. Industries served include commercial laundry, amusement parks, marine, metalworking, power generation, pulp & paper, transit, water treatment and wastewater treatment Rowland Company’s product categories include air starters, brakes, clutches, crane controls & electrification, flexible couplings, friction and wear materials, gearboxes, industrial lighting & signals, mobile crane brake parts, universal joints, and driveshafts.
N.T. Ruddock Company was founded in 1951 and is located in Cleveland, Ohio. N. T. Ruddock is ISO 9001:2015 registered and is a distributor off industrial equipment. Product lines include blast cleaning abrasives, equipment and replacement parts, primary and secondary aluminum ingot, aluminum and copper master alloys, and pure metals. Abrasive options include glass beads, corn cob, crushed glass, steel shot, copper slag, and more. Metal options include aluminum alloys, aluminum master alloys, copper master alloys, ferro alloys, alloy additions, and beryllium alloys. Additionally, N.T. Ruddock also sells many types of parts such as nozzles, guns, and valves, in addition to larger equipment such as blast cabinets and blast pots. NT. Ruddock offers installation, cleaning, repair, custom bagging, and in-house blending of abrasives, and repair.
AIRMATIC was founded in Philadelphia in 1944. AIRMATIC serves a many industries including cement and concrete, oil, gas, energy, biomass, chemical products, feed & grain, food manufacturing, glass & ceramics, and clay. For these industries, AIRMATIC provides installation, maintenance, fabrication, silo cleaning, inspection, and repair, as well as repair and rebuilding of power tools. AIRMATIC also has an extensive lineup of products for sale including air cannons, automatic lubrication systems, belt conveyor components, flow detectors, finishing equipment, safety equipment, industrial vibrators, railcar openers and unloading equipment, rebar tools, valves and actuators, and mechanical force exciters.
Diamond Needle Corp is the North American distributor for Organ Needle Co., LTD of Japan. Diamond Needle Corp is a supplier of sewing supplies and materials. Individuals and industries served include apparel, automotive, bag closing, bookbinding, embroidery, filters, furniture, home fashions, industrial textiles, mattresses, non-woven, quilting, and other special applications. Diamond Needle has over 100,000 parts and supplies available including needles, replacement parts, scissors, lubricants, chemicals for cleaning and adhesive use, specialized tools, drive belts, crayons, markers, safety aids such as gloves and needle protection, and electric busways.
AutomationDirect.com was founded in 1994 to provide solutions for the industrial automation market and has been growing its list of offerings ever since. AutomationDirects’ extensive catalog includes individual components such as cables, various controls, I/O devices, relays, gauges, fittings, and sensors to complete systems. Many parts and devices, especially PLC units are customizable. AutomationDirect.com also provides support via video instructions, online manuals, a learning library, an active community forum to further assist customers.
KROHNE Group began in Duisburg, Germany in 1921 as a producer of variable area flowmeters. Today KROHNE isa a provider of industrial measurement products, solutions, and services. KROHNE services the chemical, food & beverage, life sciences, marine, metal & mining, nuclear, oil & gas, power generation, pulp & paper, water & wastewater, and sustainable energies industries. KROHNE product lines include tools for flow, level, temperature, and pressure measurement as well as process analytics and smart flow control. KROHNE offers full solutions for flow metering, monitoring, and wireless and remote metering applications.
Saddle Brook Controls is a division of Ribble Engineering, which was founded in 1933 in Saddle Brook, New Jersey. Saddle Brook Controls is a manufacture as well as a designer, distributor, and support service provider of automation solutions for factory automation. Product groups include PLCs, controllers, Remote IO devices, HMIs, industrial computers, machine vision and inspection machines, motion devices, drives, motor controls, enclosures, circuit breakers, safety products, sensing and control products, power supplies, and UPS.
ABB Electrification Canada is a subsidiary of industrial giant, ABB. ABB Electrification serves the data center solutions, oil, gas & chemicals, food & beverage, railway, infrastructure, and microgrids industries with solutions such as smart industry, E-mobility, smart living, smart power, smart cities, and smart distribution. Products include control systems, power electronics, UPS and power conditioning, industrial software, PLPC automation, robotics, power converters and inverters, medium voltage products, metallurgy products, control room solutions, and motors and generators.
Pepperl+Fuchs, Inc. was founded in Mannheim, Germany in 1945 developing the forerunner of the proximity switch. Pepperl+Fuchs continues to develop proximity sensors as well as other industrial sensors including ultrasonic sensors, rotary encoders, positioning systems, display and signal processing, vibration monitoring, industrial communication, and signal processing as well as related accessories and software. Explosive protection products include safety barriers, surge protection, wireless solutions, HMI systems, power supplies, electrical explosion protection equipment, level measurement, and related software.
Founded in 1890 in Missouri, Emerson Electric Co., is a technology and engineering company that provides various solutions for customers in industrial, commercial, and consumer markets globally. Business segments include automation solutions, AspenTech, and commercial & residential solutions segments. The Automation Solutions segment offers measurement and analytical instrumentation, industrial valves and equipment, and process control software and systems. The AspenTech segment provides asset optimization software for enhancing performance through a combination of modeling, simulation, and optimization capabilities. The Commercial & Residential Solutions segment offers residential and commercial HVAC products, system protector and flow control devices, and IoT thermostats.
Auburn Armature was founded in 1946 and headquartered in Auburn, New York. Auburn Armature is a distributor of electrical products and was recently purchased by Power-Flo Technologies of New Hyde Park, New York. Services that Auburn Armature provide include training, testing, rebuilding, repair, troubleshooting, and training. Parts that Auburn Armature specialize in include automation systems, AC and DC drives, motor controls, motors, motion controls, connectors, wire, boxes, cables, sensors, relays, transformers, panels, struts, terminal blocks, lighting supplies, and conduits.
bisco industries was founded in Chicago, Illinois in 1973 and now is headquartered in Anaheim, California. bisco industries is a distributor of electronic components and fasteners used for production in aerospace, communication, computer, fabrication, industrial equipment, instrumentation, marine, and military industries. Some of bisco’s product offerings include fasteners such as nuts and washers, hardware such as casters and bearings, door and access hardware including handles and hinges, electronic connectors including circular connectors and terminal blocks, enclosures such as cabinets and rack components, and wires and cables including wire and cable management including sleeving and tubing.
Ranking as of March 2023 in United States of AmericaDerivation Method
|3||Producto Electric Corp.||20%|
|5||L. A. Woolley Electric, Inc.||20%|
Ranking as of March 2023 GloballyDerivation Method
|3||Producto Electric Corp.||20%|
|5||L. A. Woolley Electric, Inc.||20%|
Derivation MethodThe ranking is calculated based on the click share within the junction box page as of March 2023. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.
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