K Series Junction Box

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K Series Junction Box
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Additional information

Model Number

K207, K211, K215, K407, K411, K415
Rated Voltage

500V
Connection Method

Screw Connection
Material of Shell

PA Polyamide 66, PC Polycarbonate, UL94 V2 grade
Metal Material

Brass bar, Iron screw, plated zinc
Operating temperature

PA: -40℃-110℃ PC：-35℃-120℃
Screw specs

45# steel
Rigid conductor

Nickel plated copper
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The UKK showcases a full range of models

K207

K207

Model
K207
Special color
Blue/Red/Green/Yellow
Current
125A
Voltage
500V
Length/Width/High
95×47.5×50
busbar specifications
5xФ5.5mm  1xФ7.5mm  1xФ9.5mm
Number of busbars
2
Flexible conductor mm²
10-25  0.75-4  1.5-6
Rigid conductor mm²
10-35  1.5-4  2.5-6

K211

K211

Model
K211
Special color
Blue/Red/Green/Yellow
Current
125A
Voltage
500V
Length/Width/High
100×45×50
busbar specifications
5xФ5.3mm  1xФ7.5mm  1xФ9mm
Number of busbars
2
Flexible conductor mm²
10-25  0.75-4  1.5-6
Rigid conductor mm²
10-35  1.5-4  2.5-6

K215

K215

Model
K215
Special color
Blue/Red/Green/Yellow
Current
125A
Voltage
500V
Length/Width/High
134×45×50
busbar specifications
5xФ5.5mm  1xФ7.5mm  1xФ9.5mm
Number of busbars
2
Flexible conductor mm²
10-25  0.75-4  1.5-6
Rigid conductor mm²
10-35  1.5-4  2.5-6

K407

K407

Model
K407
Special color
Blue/Red/Green/Yellow
Current
125A
Voltage
500V
Length/Width/High
109×90×50
busbar specifications
5xФ5.5mm  1xФ7.5mm  1xФ9.5mm
Number of busbars
4
Flexible conductor mm²
10-25  0.75-4  1.5-6
Rigid conductor mm²
10-35  1.5-4  2.5-6

K411

K411

Model
K407
Special color
Blue/Red/Green/Yellow
Current
125A
Voltage
500V
Length/Width/High
109×90×50
busbar specifications
5xФ5.5mm  1xФ7.5mm  1xФ9.5mm
Number of busbars
4
Flexible conductor mm²
10-25  0.75-4  1.5-6
Rigid conductor mm²
10-35  1.5-4  2.5-6

K415

K415

Model
K415
Special color
Blue/Red/Green/Yellow
Current
125A
Voltage
500V
Length/Width/High
182×90×50
busbar specifications
11xФ5.5mm  3xФ7.5mm  1xФ9.5mm
Number of busbars
4
Flexible conductor mm²
10-25  0.75-4  1.5-6
Rigid conductor mm²
10-35  1.5-4  2.5-6

Why Choose Shengling?

Zhejiang Shengling Electric Co., Ltd. is a professional manufacturer focused on the R&D and production of terminal blocks. With years of dedication to the electrical connection industry, we have built strong manufacturing experience and reliable technical expertise.

For UKK distribution blocks, Shengling meets diverse market needs with solid manufacturing strength and mature production control.

Our UKK products feature a well-designed structure, easy wiring, and suitability for various power distribution applications, helping improve installation efficiency and reliability. Whether for standard models or different application needs, Shengling provides professional support and stable supply.

 

SMART TERMINAL SOLUTIONS

Empowering Electrical Connections With Innovation & Efficiency

Customized for R&D

  • Functional upgrades and structural optimizations
  • Dedicated mold design and rapid prototyping
  • Multi-scenario compatibility engineering

Certification and Support

  • International Compliance Documentation Guidance
  • Testing Organization Coordination and Standards Interpretation
  • Technical Documentation Localization

Flexible delivery

  • Finished Product/SKD Supply Options
  • Trial Order Verification Support
  • Priority Logistics from Key Ports

Structure of a UKK single-level junction box

  • Rail-mount base: Designed to snap onto a DIN rail for easy installation and removal.
  • Input terminal: Usually one main input port for connecting the main power supply.
  • Output terminal: Typically one input with multiple outputs, used to distribute one main wire into several branch wires.
  • Conductor: Usually made of copper alloy or nickel-plated copper, responsible for conduction and power distribution.
  • Insulating housing: Commonly made of PA nylon or similar insulating materials, featuring flame resistance, heat resistance, and impact resistance.
  • Transparent cover: Makes it easy to check the internal wiring condition; some designs are openable or hinged.

Internal structure and materials

UKK terminal blocks typically use flame-retardant PA66 insulated housings, with internal conductive components mostly made of brass and nickel-plated. The fastening screws are generally made of high-strength steel with electroplated surfaces to balance insulation safety, conductivity, and mechanical strength.

This material is resistant to deformation or releasing toxic fumes under high temperatures or short circuits, effectively isolating ignition sources and preventing faults from escalating into fires.

Flame retardant rating and mechanism

UKK terminal housings typically meet the V-0 flame retardant standard, meaning they self-extinguish within 3 seconds of the ignition source being removed after contact with a flame, without dripping burning material or causing further spread.

This material is resistant to deformation or releasing toxic fumes under high temperatures or short circuits, effectively isolating ignition sources and preventing faults from escalating into fires.

UKK junction box wiring method

UKK typically uses DIN rail screw terminals/branch terminals. The connection method is very straightforward: first, disconnect the power, strip the wire ends, insert them into the terminal crimping position, and then tighten the screw to secure them.

If it is a flexible wire, it is usually more stable and safer to crimp the cold-pressed end first and then connect it to the terminal.

UKK wiring method

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UKK series DIN rail type single-pole junction box - actual photos

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Frequently asked questions about UKK single-stage junction box

Can UKK single pole junction boxes be used for high currents?

Yes, but it depends on the rated current of the specific model. Common UKK models on the market include 80A, 125A, 160A, 250A, 400A, 500A, etc. Different specifications correspond to different current carrying capacities and cannot be mixed.

The common configuration is a flame-retardant insulating shell + brass or copper conductor. Some products will be surface-plated to improve conductivity and corrosion resistance. Material details of different manufacturers will vary.

Most conventional UKK single pole junction boxes are better suited for indoor distribution or cabinet installation. If it is used outdoors, additional considerations are usually required to be waterproof, moisture-proof, dustproof and corrosion-proof. If necessary, a protective box should be added or a higher protection level solution should be selected.

The most common are:

Wire diameter and terminal specifications do not match
Crimping/locking wires are not in place, resulting in looseness and heat generation
Conductor not fully inserted
Torque is too large or too small
Multiple stranded wires are not handled properly, resulting in virtual connections
These are typical failure points for terminal blocks and branch distribution blocks.

A slight temperature rise may exist when the power is on, but if it is obviously hot to the touch, the shell is discolored, and there is a burnt smell, it usually indicates an abnormality, such as overload, excessive contact resistance, loose wiring, small wire diameter, etc.

The premise is that the parameters of the product itself are compliant, the installation specifications are met, and the load does not exceed the standard. Industry data generally emphasizes that such power distribution components should be powered off during installation and maintenance, and the fixation, identification, and insulation status should be confirmed before being put into operation.

Can one enter and multiple exits be used? Yes, UKK itself is used for branching and distribution.
Can it be mounted on the guide rail? Most UKK series support DIN rail mounting.
Can it be used outdoors? It is not recommended to wear the regular model naked outdoors, and protection is required.
Will it burn? There are risks in incorrect selection, overloading, and loose crimping.
How to choose a model? Choose according to the current, wire diameter, number of outlet positions, and installation environment.

How to Maintain Terminal Blocks

Regular Inspection

  • Regularly inspect terminal blocks for signs of wear, corrosion, or loose connections.

Clean Terminal Blocks Regularly

  • Use a soft brush and compressed air to clean terminal blocks and remove any dirt, dust, or debris that may accumulate on the contact points.

If Any Loose Connection Is Found

  • If any connection becomes loose, use a screwdriver to tighten the screws to the manufacturer’s recommended torque value. This helps ensure a safe and reliable electrical connection.

Check for Overheating

  • Inspect terminal blocks for signs of overheating, such as discoloration or deformation. Overheating may be caused by excessive current or poor contact resistance, and should be addressed promptly to prevent further damage.

Always Use Properly Sized Terminal Blocks

  • Be sure to select the correct size and type of terminal block according to the application requirements. Using undersized terminal blocks may lead to overheating, poor contact, and other issues.

Troubleshoot Faulty Connections

  • If a faulty connection occurs, check the wiring for short circuits, open circuits, or incorrect positioning. Use a multimeter or other diagnostic tools to identify the root cause of the problem.

Follow the Manufacturer’s Guidelines

  • Always follow the terminal block manufacturer’s instructions for installation, operation, and maintenance to ensure safe and reliable performance.
 

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