UKK Series Unipolar Junction Box: A Modular Power Distribution Solution
The UKK Series Unipolar Junction Box is a compact power distribution block available in six models, from 80A to 500A, all rated for 690V IEC. It is designed for single-pole junction applications where one incoming line needs to be distributed to multiple outgoing circuits. The product combines a PA Nylon housing, UL94V0 flame retardant grade, brass metal parts, and a transparent cover that makes it easier to check the cable working condition.
Product Features
The UKK Series focuses on practical, visible, and reliable construction. The housing is made of PA Nylon. The flame retardant grade is UL94V0. The metal material is brass. The transparent cover is better for checking the cable working condition. These features help users inspect connections without removing the cover.
Model Overview
Each UKK model offers specific current ratings, conductor cross-sections, hole quantities, and dimensions. The table below matches the product image exactly.
| Model | Current | Voltage | Conductors with start/end ferrules x-section (mm²) | Hole QTY (PCS) | Dimension (L×W×H) (mm) |
|---|---|---|---|---|---|
| UKK-80 | 80A | 690V IEC | 6 to 16; 2.5 to 6; 2.5 to 16 | x1; x4; x2 | 28×65×47 |
| UKK-125 | 125A | 690V IEC | 10 to 35; 6 to 16; 2.5 to 16 | x1; x4; x6 | 28×74×48 |
| UKK-160 | 160A | 690V IEC | 10 to 70; 6 to 16; 2.5 to 16 | x1; x4; x6 | 28×74×48 |
| UKK-250 | 250A | 690V IEC | 35 to 120; 6 to 35; 2.5 to 16; 2.5 to 10 | x1; x2; x5; x4 | 47×95×50 |
| UKK-400 | 400A | 690V IEC | 90 to 185; 6 to 35; 2.5 to 16; 2.5 to 10 | x1; x2; x5; x4 | 47×95×50 |
| UKK-500 | 500A | 690V IEC | 4×15.5×0.8 to 8×24; 6 to 35; 2.5 to 16; 2.5 to 10 | x1; x2; x5; x4 | 49×95×50 |
The UKK-80, UKK-125, and UKK-160 each provide 6 connection holes in total. The UKK-250, UKK-400, and UKK-500 each provide 12 connection holes in total. The UKK-500 also supports a special conductor configuration from 4×15.5×0.8 to 8×24. Dimensions increase with current rating, from 28×65×47 mm on the UKK-80 to 49×95×50 mm on the UKK-500.
How to Choose the Right UKK Model
Choosing the right model starts with the current rating. If your application requires 80A, 125A, or 160A, the UKK-80, UKK-125, or UKK-160 provides 6 holes. For higher current needs, the UKK-250, UKK-400, and UKK-500 offer 12 holes and larger conductor cross-sections. You should also match the conductor cross-section to the start/end ferrules. For example, the UKK-80 accepts 6 to 16 mm², 2.5 to 6 mm², and 2.5 to 16 mm² conductors, with hole quantities of x1, x4, and x1 respectively. The UKK-500 accepts 4×15.5×0.8 to 8×24, 6 to 35 mm², 2.5 to 16 mm², and 2.5 to 10 mm² conductors, with hole quantities of x1, x2, x5, and x4. Always check the dimension to ensure the junction box fits your available space.
Topics Readers Often Ask About
What does the transparent cover do?
It allows you to check the cable working condition without opening the junction box. This makes inspection faster and easier.
Why is UL94V0 important?
UL94V0 is the flame retardant grade of the PA Nylon housing. It indicates the material’s flame retardant performance.
What is the role of brass?
Brass is the metal material used in the UKK Series. It provides the conductive and mechanical connection points.
How do the hole quantities work?
Each model lists several conductor cross-sections and a corresponding hole quantity. For the UKK-80, UKK-125, and UKK-160, the total is 6 holes. For the UKK-250, UKK-400, and UKK-500, the total is 12 holes.
What is special about the UKK-500?
It supports a conductor range from 4×15.5×0.8 to 8×24, in addition to 6 to 35 mm², 2.5 to 16 mm², and 2.5 to 10 mm². This makes it the most flexible model in the series.
How do dimensions change across models?
The UKK-80 measures 28×65×47 mm. The UKK-125 and UKK-160 measure 28×74×48 mm. The UKK-250 and UKK-400 measure 47×95×50 mm. The UKK-500 measures 49×95×50 mm.
The UKK Series Unipolar Junction Box provides six current ratings from 80A to 500A, all at 690V IEC. The housing is PA Nylon with UL94V0 flame retardant grade, the metal parts are brass, and the transparent cover helps users check the cable working condition. Each model has clear conductor cross-sections with start/end ferrules, hole quantities, and dimensions. The UKK-80, UKK-125, and UKK-160 offer 6 holes, while the UKK-250, UKK-400, and UKK-500 offer 12 holes. The UKK-500 also accepts a special conductor range from 4×15.5×0.8 to 8×24. Dimensions range from 28×65×47 mm to 49×95×50 mm. By matching current, conductor cross-section, hole quantity, and dimension, users can select the right model for their power distribution needs. All specifications in this article are taken directly from the product image.