✅Screw-type DIN rail terminal blocks are one of the most classic and reliable wiring solutions in electrical control systems.
✅They feature a durable nickel-plated copper conductor and flame-retardant PA66 housing, ensuring solid and vibration-resistant connections.
The UK series standard screw terminal blocks are designed for reliable, long-term wiring in industrial control and power systems.
Different models such as UK2.5B, UK3N, UK5N, UK6N, UK10N, UK16N, UK35N, UK50N,UK95N,UK150N cover a wide range of wire sizes and current capacities, ensuring secure and efficient electrical connections for every application.
| Model | Wire Size (mm²) | Rated Current (A) | Rated Voltage (V) | Width (mm) | Typical Use |
|---|---|---|---|---|---|
| UK2.5B | 0.2–2.5 | 32A | 690V | 6.2 | Signal or control wiring |
| UK3N | 0.2–2.5 | 41A | 800V | 5.2 | Compact control circuits or PLC terminals |
| UK5N | 0.2–4 | 41A | 800V | 6.2 | General-purpose control circuits |
| UK6N | 0.2–6 | 57A | 690V | 8.2 | Power supply and distribution connections |
| UK10N | 0.5–10 | 75A | 800V | 10.2 | Power lines in control panels |
| UK16N | 0.5–16 | 101A | 800V | 12.2 | High-current distribution |
| UK35N | 10–35 | 150A | 800V | 15.2 | Power input terminals |
| UK50N | 25–50 | 150A | 1000V | 20.2 | Main power or motor supply wiring |
| UK95N | 35–95 | 232A | 1000V | 26.2 | Heavy power equipment wiring |
| UK150N | 50–150 | 390A | 1000V | 31.2 | Main power and motor supply lines |
📊 Each model increases in conductor size and current capacity — larger numbers mean higher load handling.
The Standard Screw Terminal Series provides a robust and flexible solution for all wiring tasks — from compact signal circuits to heavy-duty power lines — with full accessory compatibility.
Efficient wiring in limited panel space often requires terminals with more than one connection level.
AOSI’s multi-layer and double-layer UK-type terminals allow engineers to connect multiple circuits vertically within the same DIN-rail footprint — ideal for PLC I/O wiring, signal distribution, and compact control panels.
🔹 Product Range Overview
| Model | Layers | Wire Range | Rated Current (A) | Rated Voltage (V) | Typical Use |
|---|---|---|---|---|---|
| MBKKB2.5 | 2 | 0.2–2.5 mm² | 32A | 500V | For control and signal wiring in compact panels |
| MBKKB2.5-PV | 2 | 0.2–2.5 mm² | 32A | 500V | For voltage distribution or shared potential circuits |
| DIKD1.5 | 3 | 0.2–2.5 mm² | 15A | 300V | For high-density signal wiring such as PLC I/O modules |
| UKK3 | 2 | 0.2–2.5 mm² | 25A | 500V | For compact control and automation wiring |
| UKK5 | 2 | 0.2–4 mm² | 32A | 500V | For higher current control and power circuits |
⚙️ Key Advantages
✅ Space-Saving Design – Multiple levels allow twice or triple the connection points without increasing rail length.
✅ Clear Identification – Each layer supports separate marking positions for easy circuit recognition.
✅ Reliable Screw Connection – Same screw-clamp technology ensures vibration-resistant and maintenance-free performance.
✅ Full Compatibility – Fits standard 35 mm DIN rails and accepts all UK-series accessories (jumpers, end plates, markers).
✍️ Summary
The multi-layer and double-layer terminal range offers a compact, modular, and flexible wiring solution that helps reduce control cabinet space while maintaining clean, organized connections — a perfect match for modern automation and signal systems.
In modern control and distribution systems, engineers often need to split one circuit into multiple outputs or connect parallel lines efficiently.
AOSI’s twin and multi-output terminals offer flexible bridging and high-reliability screw connections — ideal for power branching, signal duplication, and quick distribution setups.
🔹 Product Range Overview
| Model | Structure Type | Connection Type | Wire Range (mm²) | Rated Current (A) | Rated Voltage (V) | Typical Use |
|---|---|---|---|---|---|---|
| UDK4 | Twin terminal | 2-in / 2-out | 0.2–4 | 32A | 690V | For parallel input/output wiring, dual signal or power distribution |
| UK5-TWIN | Twin terminal | 1-in / 2-out | 0.2–4 | 32A | 500V | For power branching — one feed line distributed to two devices |
⚙️ Key Features
✅ One-Input Multi-Output Design – Enables quick branching or parallel wiring without extra jumpers, simplifying power and signal distribution.
✅ Compact & Space-Saving – Integrates multiple connection points in a single terminal width, maximizing DIN-rail efficiency.
✅ Reliable Screw Connection – Ensures stable contact and consistent voltage sharing for long-term industrial use.
When protecting control and power circuits, a fuse terminal block offers both connection reliability and safety assurance.
The UK5-HESI and UK10-DREHSI series integrate standard cartridge fuses directly into the terminal housing — enabling quick replacement, visual fuse indication, and compact installation.
They are widely used in control panels, automation systems, and power distribution units where branch circuit protection is essential.
🔹 Product Range Overview
| Model | Fuse Type | Wire Range (mm²) | Rated Current (A) | Rated Voltage (V) | Typical Use |
|---|---|---|---|---|---|
| UK5-HESI | 5 × 20 mm glass fuse | 0.2–4 | 6.3A | 800V | For small control circuits and signal protection |
| UK10-DREHSI | 5 × 20 mm glass fuse | 0.5–16 | 6.3A | 800V | For higher-current branch or power line protection |
⚙️ Key Features
✅ Integrated Protection – Combines connection and circuit protection in one compact terminal block.
✅ Quick & Tool-Free Fuse Replacement – The flip-top cover allows easy fuse change without removing wires.
✅ Visual Fuse Status – Transparent housing provides immediate visibility when a fuse is blown.
The AOSI USLKG series (PE-type ground terminal blocks) provides a reliable protective earth connection in control panels and power distribution systems.
Each terminal is designed with a green-yellow housing and a metal contact foot that automatically grounds to the DIN rail — ensuring safety, stability, and compliance with international electrical standards.
⚡ What Is a Ground Terminal Block?
A ground terminal block is a special terminal designed to connect equipment or circuit grounds (PE lines) directly to the DIN rail, which serves as a conductive grounding path.It ensures that any leakage current or fault voltage is safely transferred to the ground, preventing electrical hazards and equipment damage.
🧩 Available Models (USLKG Series)
| Model | Wire Range (mm²) | Rated Current (A) | Rated Voltage (V) |
|---|---|---|---|
| USLKG2.5 | 0.2–2.5 | 32A | 690V |
| USLKG3 | 0.2–2.5 | 41A | 800V |
| USLKG5 | 0.2–4 | 41A | 800V |
| USLKG6 | 0.5–6 | 57A | 690V |
| USLKG10 | 1.5–10 | 75A | 800V |
| USLKG16 | 0.5–16 | 101A | 800V |
| USLKG35 | 0.75–35 | 150A | 800V |
How to Pair & Use
(Example: For circuits using UK5N terminal blocks, pair with USLKG5 for consistent size and spacing.)
How to Know If You Need Ground Terminals
You need USLKG grounding terminals if:
Summary
The AOSI USLKG series offers a complete range of PE grounding terminals from 2.5mm² to 35mm², ensuring reliable protective earth connections for all control and power applications.Compact, durable, and easy to install — these terminals are the foundation of a safe and compliant electrical system.
To ensure safe, organized, and efficient installation, the UK screw terminal series can be paired with a full range of standard accessories.
These accessories make wiring easier, improve identification, and enhance overall system reliability.
🧩 Accessory List
💡 Compatibility Note
Most of the above accessories — such as fasteners, marker strips, DIN rails, ferrules, and cable ties — are universally compatible across all UK-type terminal blocks.However, the following components must be matched to the specific terminal model or size:
This ensures perfect fit, secure installation, and consistent appearance in your wiring system.
Choosing the correct terminal block ensures safe, efficient, and durable wiring.AOSI’s UK screw-type DIN rail terminals come in various structures and ratings — from small signal circuits to high-current power lines.Follow the guide below to select the most suitable model for your application.
| Wire Range (mm²) | Recommended Models | Typical Application |
|---|---|---|
| 0.2 – 2.5 | UK2.5B / UK3N | Control or signal circuits, PLC wiring |
| 0.5 – 6 | UK5N / UK6N | General control and power distribution |
| 0.75 – 16 | UK10N / UK16N | Power circuits and small equipment wiring |
| 10 – 35 | UK35N | Main power input, contactor wiring |
| 25 – 150 | UK50N / UK95N / UK150N | High-current, heavy-load distribution |
💡 Tip: The larger the wire cross-section, the higher the current rating required.
| Function Type | Recommended Series | Usage Purpose |
|---|---|---|
| Standard Wiring | UK Series (UK2.5B–UK35N) | General power and signal connections |
| Fuse Protection | UK5-HESI / UK10-DRESI | Circuits requiring overload protection |
| Multi-Layer Wiring | MBKKB2.5 / DIKD1.5 / UKK3 / UKK5 | Compact control panels and PLC I/O wiring |
| Multi-Output Branching | UDK4 / UK5-TWIN | Power or signal distribution (1→2 / 2→2) |
| Grounding | USLKG Series | Protective earth (PE) connection |
| Accessories | E/UK, ZB6, D-UK2.5B, FBI 10-6, UK-B2 | Installation and labeling support |
Universal accessories: fasteners, marker strips, DIN rails, ferrules, and cable ties are compatible across all models.
⚠️ Model-specific parts:
(1) Always match the wire size and current capacity of your circuit.
(2) For compact panels, prefer multi-layer or twin terminals.
(3) For circuits requiring overload or branch protection, choose fuse-type models.
(4) For complete safety, include matching ground terminals and accessories from the same UK series.
A proper selection ensures your wiring is safe, neat, and compliant with IEC/UL standards.
If you’re unsure which terminal fits your project, contact AOSI for technical selection support — our team will recommend the right models and accessories based on your wiring diagram.
UK series DIN rail terminal blocks, with their reliable screw connection technology and modular design, are widely used across various industrial and electrical applications that require secure and organized wiring.
Installing the UK2.5B screw-type terminal block is simple and reliable.
Follow the 4 steps below to ensure a secure and professional connection 👇
Step 1 – Prepare the Wire
Action: Strip off the insulation layer of the wire and insert it into the insulated ferrule (if used).
💡 Tip: Leave about 8–10 mm of bare conductor exposed for the best contact surface.
Step 2 – Loosen the Screw Clamp
Action: Insert a flat-blade screwdriver into the screw slot and turn counterclockwise to fully open the clamp.
💡 Tip: Ensure the clamping plate is fully released before inserting the conductor.
Step 3 – Insert the Conductor
Action: Push the wire deep into the terminal’s wire entry hole until it reaches the bottom.
💡 Tip: Make sure the wire strands are not exposed outside the terminal housing.
Step 4 – Tighten and Secure
Action: Turn the screwdriver clockwise to tighten the screw until the wire is firmly clamped.
💡 Tip: Do not overtighten — ensure the wire is secure but the clamp remains undamaged.
✅ Installation Complete
The conductor is now securely fixed inside the terminal.Perform a gentle pull test — the wire should stay firmly in place.Your UK2.5B terminal is ready for reliable use in control, signal, or power wiring applications.
Below are 10 trusted manufacturers in the global terminal block industry — Choosing a reliable manufacturer ensures the safety, consistency, and durability of your wiring system.
As a professionally recognized manufacturer in the industry, AOSI has become a leading enterprise in the electrical connection field with its excellent product quality and global services.
$10,000,000+ Annual Export Value
Serving 20+ Countries & Regions
Long-term Partnerships with World-renowned Brands
One-stop Electrical Connection Solutions
AOSI delivers high-quality terminal block solutions that balance performance, durability, and cost efficiency.All products meet UL, CE, RoHS, and ISO standards, ensuring global compliance and reliability.
With a highly automated production system—from injection molding to assembly—AOSI maintains stable quality while reducing manufacturing costs.
Cost-effective reliable products for industrial applications
Fast delivery with flexible response to customer needs
Professional technical support with customized solutions
Extensive inventory ensuring timely delivery
Customers never worry about delivery lead times
Efficient logistics system with global distribution
Premium equipment from Germany, Japan, Taiwan
Highly automated production, 30% cost reduction
Information management for optimized production
"We provide not just products, but professional electrical connection solutions"
Customers need not only products but also professional application guidance and solutions
UL
CE
CQC
TUV
RoHS
Reach
24h
Response Time
98%
Customer Satisfaction
Phoenix Contact is recognized as a global leader in industrial connection and automation technology.
It developed the world-renowned CLIPLINE Complete terminal block system, which includes screw, spring, and push-in types.
Phoenix Contact’s UT Series (screw-type) and PT Series (push-in) DIN rail terminals are widely used in control cabinets, power systems, and automation projects.
Weidmüller is one of the most established brands in industrial electrical connectivity, with products covering signal, data, and power transmission.
Its W-Series and Z-Series terminal blocks are known for high reliability, robust screw connections, and wide compatibility with industrial control standards.
Weidmüller’s DIN rail terminals are favored for precision engineering and durable materials, suitable for harsh industrial environments.
WAGO is the pioneer of spring clamp connection technology, offering maintenance-free wiring without screws.
Its TOPJOB® S DIN rail terminal series is known for quick installation, vibration resistance, and compact design, making it ideal for automation and building control.
Although best known for spring terminals, WAGO also provides screw-type variants for special applications.
TE Connectivity is a global technology company specializing in connectivity and sensor solutions for energy, transportation, and industrial systems.
In the DIN rail terminal segment, TE offers SNK Series and Entrelec terminals (after acquiring ABB’s terminal business), covering screw, spring, and push-in types.
These terminals are valued for their robust design, global certification, and high reliability in power and control panels.
Dinkle is one of Asia’s most established terminal block manufacturers, providing professional wiring solutions for control panels, automation, and building systems.
Its DK and EK Series DIN rail terminal blocks feature screw-type designs compatible with European standards such as Phoenix and Weidmüller.
Dinkle is recognized for stable quality, competitive pricing, and a strong distribution network across Asia, Europe, and America.
DEGSON is a leading Chinese manufacturer of electrical connectors and terminal blocks, holding UL, VDE, CE, and TUV certifications.
Its DG Series DIN rail terminals cover screw, spring, and plug-in types, offering compatibility with international models.
DEGSON is well-known for combining large-scale automated production with competitive pricing, serving both domestic and global OEM markets.
WIELAND Electric, founded in 1910, is one of the oldest German electrical connection solution providers.
Its selos and fasis series DIN rail terminal blocks are designed for both industrial and building automation systems.
WIELAND terminals feature high current-carrying capacity, modular design, and accessories compatible with global standards, ensuring efficient and safe wiring in distribution panels.
PTR HARTMANN GmbH specializes in high-precision terminal blocks, PCB connectors, and test probes.
The company’s SR Series DIN rail terminal blocks offer robust screw connections and high dielectric strength.
PTR is known for its German engineering quality and is a reliable OEM/ODM supplier for customized connection systems.
CONTA-CLIP is a German manufacturer focused on connection technology, cable management, and electronics interface modules.
Its SRK series screw-type DIN rail terminals provide a wide range of cross-sections and colors, designed for fast installation and stable performance.
CONTA-CLIP terminals are commonly used in industrial automation, railway technology, and energy distribution applications.
Choosing and ordering the right terminal blocks is simple with AOSI.
Follow the steps below to ensure smooth communication, accurate model selection, and timely delivery.
Step 1 – Confirm Model and Specifications
Select the proper model according to your project’s wire size, current capacity, and functional requirements.Common choices include UK2.5B, UK5N, UK10N, UK16N, UK35N, and matching accessories such as USLKG grounding terminals and FBI jumpers.
Step 2 – Request Quotation
Send us your selected models, required quantity, and destination country.Our sales team will provide a formal quotation including price, lead time, shipping terms, and available stock within 24 hours.
Step 3 – Confirm Order and Payment Terms
After reviewing the quotation, confirm your order details.Payment can be made by T/T, PayPal, or L/C, depending on your order scale and region.
Step 4 – Production and Quality Inspection
Once payment is received, production or stock allocation begins.All terminal blocks are tested for appearance, insulation resistance, torque, and conductivity before packing.
Step 5 – Packaging and Delivery
Products are packed in export-grade cartons with full labels and barcodes.
We support express, air, and sea shipping, ensuring fast and reliable global delivery.Tracking numbers will be provided once dispatched.
We provide samples for free, you just need to tell us what you need
A screw-type terminal block connects and secures electrical conductors using a metal screw clamp. It is mounted on a DIN rail for easy installation and modular expansion.
All terminal blocks are made of PA66 (UL94-V0 flame-retardant nylon) and nickel-plated copper for excellent insulation and conductivity.
Yes. Models such as UK16N, UK35N, UK50N, and UK95N are designed for higher current applications in power distribution and industrial control.
You will need:
Most UK terminal block models have no strict MOQ — you can start with a few pieces or a small test batch.
For bulk orders, price discounts apply based on quantity tiers.
They differ mainly in wire size, rated current, and terminal width.
For Example:
UK2.5B: up to 2.5mm², 32A
UK5N: up to 4mm², 41A
UK10N: up to 10mm², 75A
Yes, they are compatible with both solid and stranded conductors. For stranded wires, it’s recommended to use ferrules (cold-pressed terminals).
Yes, all UK models are DIN 35mm compatible, so you can mix them according to circuit needs (e.g., signal + power + grounding).
Typically between 0.4–1.2 Nm, depending on the model size. Always follow product datasheet values for safe operation.
✅ In-stock items: 3–7 days
✅ Bulk production: 10–20 days
✅ Custom models: 20–25 days depending on order complexity
AOSI maintains large inventory and uses automated assembly lines, ensuring stable supply and reliable delivery even for urgent projects.
Within 24 Hours
Please leave a message for our sales team and we'll get back to you asap.
Please leave a message for our sales team and we'll get back to you asap.
Please leave a message for our sales team and we'll get back to you asap.
