Choosing the right terminal block is one of those small design decisions that can make or break the reliability of an electrical installation. When you need to carry serious current on a compact DIN rail, the Legrand 39064 terminal block steps in as a dependable workhorse. This Viking 3 series screw terminal is rated up to 50 A and 600 V, accepts conductors up to 10 mm² or 6 AWG, and is engineered for long term stability in industrial, commercial, and demanding residential applications. Because the Legrand 39064 terminal block is built to international standards and backed by decades of Legrand engineering, it has become a go to choice for panel builders, electricians, and OEMs who want rock solid, low resistance connections.
In this in depth guide, we will unpack exactly what the Legrand 39064 terminal block is, how it is constructed, which approvals it carries, and how to install it correctly on a 35 mm DIN rail. We will also explore its compatible accessories, alternate models in the Viking 3 family, and the real world environments where this compact 10 mm block truly shines. By the time you reach the end, you will understand why specifying a Legrand 39064 terminal block is a smart move when safety, orderliness, and long term performance matter.
What Is the Legrand 39064 Terminal Block?
The Legrand 39064 terminal block belongs to the Viking 3 screw type family, designed as a single level feed through connector for joining conductors inside electrical panels. At its core, the Legrand 39064 terminal block is a 10 mm pitch block with a nominal cross section of 10 mm², capable of carrying up to 50 A continuously according to the manufacturer’s data. That combination of compact width and high current rating makes the Legrand 39064 terminal block ideal for distributing power to motors, heaters, or large branch circuits without using oversized hardware.
Structurally, the Legrand 39064 terminal block consists of a robust polyamide housing wrapped around a tinned copper alloy current bar and a screw clamp assembly. The housing provides electrical insulation and mechanical protection while the internal metal parts deliver a low resistance path for current. Because the Legrand 39064 terminal block is designed as a standard feed through style, you simply land one conductor on each side, tighten the screw, and the circuit continues neatly along your DIN rail layout.
Another defining characteristic of the Legrand 39064 terminal block is its compatibility with the rest of the Viking 3 ecosystem. It snaps on to a 35 mm top hat DIN rail, uses the same CAB 3 clip on markers found in Legrand panels worldwide, and accepts bridging combs and end barriers that make busbar style commoning incredibly easy. When you choose the Legrand 39064 terminal block, you are not just buying a single component; you are tapping into a modular system built for scalable control and power distribution.
Key Electrical Ratings of the Legrand 39064 Terminal Block
Before specifying any device, it is essential to understand its electrical ratings and limits. The Legrand 39064 terminal block is UL rated for up to 600 V AC or DC and up to 50 A with copper conductors in the 6 AWG range. Under IEC standards, the same hardware is associated with an insulation voltage of around 800 V and a nominal current closer to 57 A for 10 mm² copper, which shows how conservatively the Legrand 39064 terminal block is rated for North American applications.
These voltage and current ratings mean that the Legrand 39064 terminal block is perfectly at home in industrial control panels, power distribution boards, and machinery junction boxes. It can comfortably handle three phase distribution levels commonly found at 400 V or 480 V AC, as well as DC bus voltages in renewable or battery based systems, provided that all local codes are respected. Because the Legrand 39064 terminal block is designed for overvoltage category four applications, it offers the creepage distances and insulation needed in harsh industrial environments.
Beyond nominal ratings, the Legrand 39064 terminal block is built to withstand transient overvoltages and surge conditions specified in IEC 60947-7-1. Its internal contact system maintains a low contact resistance over time, even with repeated thermal cycling under load. When engineers choose a Legrand 39064 terminal block, they do so knowing it has been verified against both European and North American standards for terminal blocks and equipment wiring terminals.
Conductor Capacity and Connection Technology of the Legrand 39064 Terminal Block
One of the most practical questions about any terminal block is simple: which conductors will it accept? The Legrand 39064 terminal block is designed for a broad conductor range, covering solid and stranded copper cables from about 1 point 5 mm² up to 16 mm², which roughly maps to AWG sizes 15 through 5. In typical installations, technicians use the Legrand 39064 terminal block with flexible conductors up to 10 mm² or 6 AWG, and with solid or coarse stranded conductors up to 16 mm² for higher current runs.
The connection system inside the Legrand 39064 terminal block is a classic screw clamp with a slotted head screw and a pressure plate or bridle. Once you insert the stripped conductor into the opening and tighten to the recommended torque around 1 point 2 to 1 point 5 newton meters, the metal saddle presses the cable firmly against the current bar. This design provides a gas tight connection that resists loosening under vibration and minimizes heating at the contact point. When you integrate the Legrand 39064 terminal block into a control panel, you are leveraging a time tested connection style trusted by electricians for decades.
For very fine stranded conductors or where codes demand it, ferrules can be crimped onto the cable before inserting it into the Legrand 39064 terminal block. The block accepts insulated ferrules within the same 2 point 5 to 10 mm² range, which improves strand management and makes maintenance even cleaner. In some circumstances, the clamp of the Legrand 39064 terminal block can accept two smaller conductors of equal size, such as two 2 point 5 mm² wires, although best practice is usually one conductor per clamp for consistent pressure and fault analysis.
Materials, Housing, and Safety Standards Behind the Legrand 39064 Terminal Block
The reliability of the Legrand 39064 terminal block begins with its housing. It uses a self extinguishing polyamide thermoplastic, commonly known as PA sixty six, which carries a UL 94 V two flammability rating. This means the housing of the Legrand 39064 terminal block resists flame propagation and will self extinguish after brief exposure to ignition sources, an essential requirement inside crowded control panels. The material can tolerate operating temperatures from roughly minus thirty degrees up to one hundred degrees Celsius without losing structural integrity.
On top of the general flammability classification, the housing used in the Legrand 39064 terminal block satisfies the glow-wire test in accordance with IEC 60695-2-11 at nine hundred sixty degrees Celsius. This is particularly important in installations where overheating from fault conditions could occur. The glow-wire test ensures that, even if a hot component contacts the plastic, the Legrand 39064 terminal block will not drip flaming material or sustain combustion. The housing colour is neutral gray, which Legrand reserves for standard circuits, while blue, orange, or red bodies are used for neutral, unswitched, or safety related circuits.
Inside the Legrand 39064 terminal block, the current bar and clamp are made from tin plated copper alloy with corrosion resistant steel screws, combining excellent conductivity with mechanical strength. These metal parts are engineered to keep contact resistance very low and to resist oxidation over years of service. When panel builders select the Legrand 39064 terminal block, they are investing in materials specifically chosen for long term electrical stability rather than short term cost savings.
Approvals and Certifications Carried by the Legrand 39064 Terminal Block
Safety and compliance are non negotiable when you design equipment that must pass inspections and operate in critical facilities. The Legrand 39064 terminal block is fully compliant with IEC and EN standards for low voltage terminal blocks, including IEC 60947-7-1, which covers terminal blocks up to one thousand volts. Compliance with this standard assures proper creepage and clearance distances, mechanical robustness, and verified electrical performance. When an engineer specifies a Legrand 39064 terminal block, they can document that the product aligns with this widely recognised standard.
Beyond IEC compliance, the Legrand 39064 terminal block carries UL 1059 and UL 486E recognition as an equipment wiring terminal block for use at 600 V in North America. This UL and cUL recognition is stamped on the side of the block together with current ratings for up to 6 AWG conductors, so inspectors can quickly confirm suitability in a control panel. Because the Legrand 39064 terminal block is also tested under CSA C22 point 2 number 158, it is accepted in Canadian installations that require CSA approved components.
A particularly significant mark on the Legrand 39064 terminal block is the Ex e II marking, indicating increased safety for use in explosive atmospheres under ATEX and IECEx regimes. Together with certification references moulded into the housing, this means the block can be installed in Zone 1 or Zone 2 hazardous locations when used inside an appropriate enclosure. Additional national marks such as KEMA KEUR, NF, and OVE appear on the housing of the Legrand 39064 terminal block, demonstrating that it has been independently tested by multiple European laboratories.
Accessories that Extend the Power of the Legrand 39064 Terminal Block
One of the strengths of the Viking 3 system is the ecosystem of accessories designed to work seamlessly with each Legrand 39064 terminal block. To start with, Legrand offers dedicated end barriers, also called closing plates, that clip onto the exposed side of the last block in a row. Because the Legrand 39064 terminal block is open on the sides by default, these end barriers provide an extra layer of protection by covering metal parts and helping the assembly maintain IP20 finger safe conditions inside the enclosure.
When multiple circuits share the same potential, bridging combs are the accessory that unlocks the full potential of the Legrand 39064 terminal block. These comb style jumpers drop into special slots on the top of the terminals and link several neighbouring blocks electrically, turning them into a compact busbar. With a single feed in conductor landed on one Legrand 39064 terminal block and a comb bridging to the next several units, you can distribute phase or neutral conductors to multiple loads without additional copper bars. The system typically allows two combs per block, enabling creative distribution arrangements in complex panels.
Clear labelling is another essential factor in maintenance friendly control gear, and the Legrand 39064 terminal block is designed to work with the CAB 3 marker system. These small plastic marker tiles simply clip into a recessed slot on top of each block. With them, you can number circuits, add functional tags, or mark phases directly on each Legrand 39064 terminal block, which pays dividends during fault finding and future modifications. Complementary accessories such as DIN rail end stops and transparent protective covers round out the system, keeping groups of terminals locked in place and shielded from accidental contact.
How to Install the Legrand 39064 Terminal Block on a DIN Rail
Although it is a robust industrial component, the Legrand 39064 terminal block is intentionally designed for quick, intuitive installation. The process begins with the DIN rail itself, normally a 35 mm top hat rail fixed vertically or horizontally inside a panel. To mount a Legrand 39064 terminal block, you hook the upper part of its moulded foot onto the rail lip and then press the bottom inward until the spring clip snaps over the opposite edge. This snap on design means no additional screws are required to keep the Legrand 39064 terminal block firmly in position during wiring.
When you are installing several terminals side by side, simply slide each Legrand 39064 terminal block along the rail until they sit flush together. Once you have your group in place, fit an end barrier on each exposed side and then secure the whole assembly with rail end stops so vibration or wire tension cannot move it. Proper mechanical fixing is critical; even though the Legrand 39064 terminal block clamps conductors tightly, you want the blocks themselves immobilised to avoid strain on connections.
Wire preparation for the Legrand 39064 terminal block follows standard good practice. Select a conductor within the approved range and strip approximately twelve millimetres of insulation to expose clean copper. If you are using fine stranded cables, crimp a suitable ferrule to prevent stray strands. Insert the prepared end fully into the cable entry of the Legrand 39064 terminal block, then tighten the screw with a correctly sized screwdriver to the specified torque. A gentle pull test on the wire ensures it is securely captured. Repeat the process for the outgoing conductor on the opposite side of the block, verify all terminations, and only then energise the panel after completing inspection and testing.
Alternate Models in the Viking 3 Range Related to the Legrand 39064 Terminal Block
While the Legrand 39064 terminal block covers the 10 mm², 50 A application space, Legrand’s Viking 3 range includes many sister products that share the same design language and accessories. For smaller control wiring, you might choose a 2 point 5 mm² or 4 mm² version, which has a narrower pitch and lower nominal current. These smaller blocks are ideal for PLC signal wiring or small relay circuits and work perfectly alongside the Legrand 39064 terminal block on the same DIN rail when you need both power and control terminals in one assembly.
For higher current circuits, Legrand offers 16 mm² and 35 mm² screw clamp terminals that can carry significantly more than the 50 A rated for a Legrand 39064 terminal block. These larger blocks use a taller profile but maintain the same Viking 3 family appearance, allowing designers to keep panels visually consistent. In heavy industrial power distribution or large motor starters, it is common to see a mixture of small control terminals, medium sized units such as the Legrand 39064 terminal block, and heavy duty lug style terminals, all working together.
There are also function specific variants that complement the Legrand 39064 terminal block. Double level versions allow two circuits to occupy the footprint of a single terminal, fuse holder terminals integrate cartridge fuses for branch protection, and dedicated earth terminals connect directly to the DIN rail for grounding. Furthermore, spring clamp variants exist in similar cross sections for users who prefer tool free push in wiring over screw tightening. When a catalogue lists the successor reference 037163, it is simply the updated part number for the same 10 mm² Legrand 39064 terminal block, ensuring continued availability in modern ordering systems.
Typical Applications of the Legrand 39064 Terminal Block in the Real World
Thanks to its combination of compact size, high current rating, and robust approvals, the Legrand 39064 terminal block appears in a wide variety of electrical systems. In industrial control panels, it is often used to distribute power from a main supply to contactors, motor starters, and variable speed drives. In such environments the screw clamp design of the Legrand 39064 terminal block offers confidence under constant vibration and frequent temperature changes, helping maintain consistent torque and contact pressure.
In power distribution boards and switchgear, the Legrand 39064 terminal block can act as a feed through connector for sub circuits, a neutral link for heavier conductors, or a convenient interface between fixed wiring and removable devices. For example, a main feeder cable may land on a series of Legrand 39064 terminal block units that are then bridged together, allowing multiple outgoing circuits to be supplied from a single protected source. This modular approach simplifies changes and expansions to the board over time.
Renewable energy systems and DC power plants also benefit from using the Legrand 39064 terminal block, particularly in photovoltaic combiner boxes and battery storage cabinets. With an insulation rating aligned with typical solar string voltages, the Legrand 39064 terminal block can safely connect PV strings, DC bus feeds, or battery strings, as long as polarity and clearances are respected. In hazardous area control systems for oil and gas or chemical processing, engineers rely on the Ex e certification of the Legrand 39064 terminal block to provide increased safety terminations inside explosion proof or purged enclosures.
Why Electricians and Panel Builders Trust the Legrand 39064 Terminal Block
Beyond datasheet numbers, there are practical reasons why electricians repeatedly specify the Legrand 39064 terminal block for new builds and retrofits. First, its compact 10 mm pitch allows for a dense arrangement of power terminals without sacrificing accessibility. When dozens of Legrand 39064 terminal block units are lined up on a single DIN rail, they still leave enough finger room for tightening screws and inserting probes, which is crucial during commissioning and maintenance.
Second, the mechanical design of the Legrand 39064 terminal block inspires confidence. The screw and clamp combination offers a tactile sense of security when tightened correctly, and the recessed metal parts help maintain an IP20 level of finger safety once wires are in place. Installers appreciate that the Legrand 39064 terminal block accepts a wide range of conductor sizes, meaning fewer different terminal types are needed in stock to support varied projects. This reduces BOM complexity and simplifies panel standardisation.
Finally, the long list of international approvals and the Ex e marking give specifiers assurance that the Legrand 39064 terminal block will satisfy inspection requirements in many jurisdictions. Whether the panel is destined for a factory floor, a commercial building plant room, a shipboard control room, or a hazardous area skid, the same Legrand 39064 terminal block can usually be used, limiting the need to redesign terminations for each destination market.
Related Product Collections for the Legrand 39064 Terminal Block
When you are specifying or purchasing the Legrand 39064 terminal block, it helps to think about the wider ecosystem of components in your panel. These related product collections from Industrial Electrical Warehouse can help you build a complete, coherent solution around your terminals:
- Legrand ➜ – Explore a curated range of Legrand products, including terminal blocks, timers, protection devices, and accessories that pair naturally with the Legrand 39064 terminal block in modern control panels and switchboards.
- Weidmuller ➜ – Browse Weidmuller terminal blocks, earth terminals, end plates, and mounting accessories. This collection is ideal if you want to compare alternative terminal technologies alongside the Legrand 39064 terminal block or standardise on a mix of brands.
- Conduit, Cable, Wire & Accessories ➜ – Complete your installation with cables, wire accessories, markers, glands, and additional terminal hardware that support reliable terminations and tidy routing around each Legrand 39064 terminal block in your enclosure.
Conclusion: Making the Most of the Legrand 39064 Terminal Block in Your Panels
When you add everything together – high current and voltage ratings, robust screw clamp technology, a wide conductor range, flame resistant materials, and a full suite of accessories – it is easy to see why the Legrand 39064 terminal block has become a trusted standard in control and distribution panels worldwide. Its Viking 3 design lets you mix and match with smaller and larger terminals while using common markers, combs, and end stops, so your wiring remains organised and scalable. Wherever reliable terminations for heavy gauge conductors are required, the Legrand 39064 terminal block offers a compact, compliant, and long lived solution.
If you are designing a new panel or upgrading an existing installation, it is worth taking a closer look at the detailed specifications, approvals, and accessory options listed on the Legrand 39064 terminal block product page in your preferred catalogue or supplier site. Reviewing those resources alongside your project’s current and voltage requirements will help you confirm that this terminal block is the right fit for your circuits and give you confidence that your terminations will perform safely for years to come.
