Selecting the correct electrical connectivity components for industrial control panels requires careful evaluation of rated current, conductor compatibility, insulation voltage, and verifiable third-party certification scope. LEIPOLE’s power distribution block portfolio—featuring the UK series power distribution blocks, UKK series power distribution blocks, and UKK6 series terminal blocks—is engineered to meet rigorous electrical and mechanical demands across diverse global markets. This technical overview synthesizes verified TÜV Rheinland and UL certification documentation, model specifications, and engineering selection criteria to help electrical engineers, panel builders, and procurement professionals verify compliance and model suitability.
What Are Power Distribution Blocks?
Power distribution blocks are specialized electrical connection components designed to split a primary electrical feed into multiple secondary circuits. By providing a common electrical connection point, they allow high-capacity main conductors to safely distribute power to multiple outgoing branch conductors.
In industrial electrical connectivity, these blocks are widely deployed across applications such as:
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Electrical control panels
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Industrial machinery and factory automation equipment
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Power distribution assemblies
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OEM electrical control systems
Unlike complete enclosure assemblies or circuit breakers, power distribution blocks focus strictly on secure, low-resistance conductor termination and reliable power routing within an enclosure.
LEIPOLE Power Distribution Block Product Range
LEIPOLE offers structured product families designed to accommodate various current ratings and conductor cross-sections. The documented core series include the UK series, UKK series, and UKK6 series. Electrical ratings vary significantly by model and cross-section, requiring careful cross-referencing with official datasheets.
Product Range Overview
|
Series |
Covered Models / Variants |
Conductor Cross-Section |
Rated Current (IthI_{th}Ith) |
Rated Insulation Voltage (UiU_iUi) |
Available Certification Documentation |
|
UK Series |
UK207, UK407, UK411, UK412, UK415; general series variants |
35 / 50 mm² |
100 / 160 A |
500 / 600 V |
TÜV Rheinland, UL 1059 |
|
UKK Series |
UKK80A, UKK125A, UKK160A, UKK160A-SK, UKK250A, UKK400A, UKK500A; general series variants |
16 / 35 / 120 mm² |
80 / 250 / 500 A |
690 V |
TÜV Rheinland, UL 1059 |
|
UKK6 Series |
UKK6 series variants |
10 to 95 mm² |
63–600 A |
690 V |
TÜV Rheinland |
TÜV Rheinland Certified Power Distribution Blocks
Compliance with European standards is verified through formal testing and certification by TÜV Rheinland. The documented LEIPOLE families maintain distinct certification records under the Low Voltage Directive (LVD) 2014/35/EU.
TÜV Rheinland Certification Summary
|
Product Family |
Certificate Number |
Referenced Standard & Edition |
Applicable Ratings |
Test Report Reference |
|
UK Series |
AN 50665461 0001 |
EN 60947-7-1:2009 |
35/50 mm², 100/160 A, 500/600 V |
CN25SI7 001 |
|
UKK Series |
AN 50665465 0001 |
EN 60947-7-1:2009 |
16/35/120 mm², 80/250/500 A, 690 V |
CN25ZX59 001 |
|
UKK6 Series |
AN 50665562 0001 |
EN 60947-7-1:2009 |
10–95 mm², 63–600 A, 690 V |
CN25HKX5 001 |
Engineers must match the specific model number and operational parameters against these certificates to ensure alignment with European market requirements. TÜV certification validates that the tested samples conform to EN 60947-7-1:2009, but it does not automatically qualify a component for every conceivable operating environment without proper thermal and short-circuit evaluation.
UL Certified UK and UKK Series Terminal Blocks
For North American market access, specific models within the UK and UKK series carry component recognition under UL 1059.
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UK Series UL Record: Covers models UK207, UK407, UK411, UK412, and UK415 under certificate identifier UL-US-2575054-0, File Number E334233.
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UKK Series UL Record: Covers models UKK80A, UKK125A, UKK160A, UKK160A-SK, UKK250A, UKK400A, and UKK500A under certificate identifier UL-US-2575056-0, File Number E334233.
Both records classify the products under UL 1059 Ed. 6 — XCFR2 Terminal Blocks – Component.
Important Compliance Note: Component recognition (XCFR2) indicates that the terminal blocks are evaluated for factory installation within a complete equipment assembly. Using a UL certified terminal block component does not automatically render a finished control panel or electrical assembly UL certified. The end-product must be evaluated under its applicable end-product standard. Furthermore, available documentation for the UKK6 series reflects TÜV compliance; buyers requiring UL-approved models in that range must verify current listing status directly.
TÜV vs UL: What Should Buyers Check?
Comparing European and North American approvals requires understanding that standards, testing criteria, and scopes differ.
|
Parameter |
TÜV Rheinland Certification |
UL Component Recognition |
|
Issuing Body |
TÜV Rheinland |
Underwriters Laboratories (UL) |
|
Primary Standard |
EN 60947-7-1:2009 |
UL 1059 Ed. 6 (XCFR2) |
|
Covered Families |
UK, UKK, UKK6 Series |
Specific UK and UKK model numbers |
|
File / Cert Identifiers |
AN 50665461 0001, etc. |
File E334233 (IDs: UL-US-2575054-0, UL-US-2575055-0 / 2575056-0) |
|
Intended Market |
European Union / CE alignment via LVD |
North America (Industrial Control Panels) |
|
Verification Need |
Match test report and cross-section ratings |
Check exact model against official UL online directory |
How to Select the Right Power Distribution Block
Proper engineering selection requires a holistic review of electrical, mechanical, and regulatory criteria rather than relying on a single metric:
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Required Conductor Cross-Section: Ensure terminal capacity matches incoming and outgoing wire sizes (e.g., matching 35 mm² or 50 mm² limits in UK series).
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Rated Current (Ith): Verify that the continuous operating current does not exceed the block's certified thermal rating (ranging from 63 A up to 600 A across series).
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Rated Insulation Voltage (Ui): Confirm voltage withstand capabilities (e.g., 500V/600V for UK, 690V for UKK and UKK6).
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Conductor Compatibility: Check whether stranded, solid, or flexible conductors with ferrules are supported by the clamping mechanism.
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Electrical and Environmental Conditions: Evaluate ambient temperature, pollution degree, and short-circuit current ratings (SCCR).
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Mounting Method: Determine compatibility with standard DIN rails (EN 60715) or direct panel mounting.
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Available Installation Space: Assess physical dimensions relative to enclosure wire-bending space and spacing requirements.
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Applicable Standards & End-Product Requirements: Align selections with target regional standards (IEC/EN vs. UL/CSA).
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Certificate Coverage for the Exact Model: Cross-check part numbers against active TÜV and UL documentation.
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Required Technical Documentation: Secure manufacturer datasheets, 2D/3D CAD drawings, and test reports prior to final procurement.
Documents to Request Before Purchasing
To satisfy technical audits and quality assurance requirements, procurement professionals and design engineers should request the following documentation from LEIPOLE or authorized distributors:
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Official product datasheets showing mechanical and electrical limits
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Dimensional drawings and CAD files
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Original TÜV Rheinland certificates (e.g., AN 50665461 0001, AN 50665465 0001, AN 50665562 0001)
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Associated test reports (e.g., CN25SI7 001, CN25ZX59 001, CN25HKX5 001)
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Official UL certification documentation under File E334233
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Manufacturer declarations of conformity (CE/LVD)
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Installation and torque instruction sheets
FAQ About Power Distribution Blocks and Certifications
1. What is a power distribution block?
A power distribution block is an electrical connection component designed to take a single high-capacity power feed and split it into multiple outgoing branch circuits securely and efficiently.
2. What is the difference between a power distribution block and a terminal block?
While standard feed-through terminal blocks typically pass power through a single input to a single output, power distribution blocks are engineered specifically with multi-port configurations to distribute incoming power from one large conductor to several smaller output conductors.
3. Which LEIPOLE power distribution blocks have TÜV Rheinland certification?
The UK series, UKK series, and UKK6 series all hold active TÜV Rheinland certification under certificates AN 50665461 0001, AN 50665465 0001, and AN 50665562 0001 respectively, referencing EN 60947-7-1:2009.
4. Which UK series models are covered by the supplied UL records?
The UL record (UL-US-2575054-0, File E334233) explicitly covers models UK207, UK407, UK411, UK412, and UK415.
5. Which UKK series models are covered by the supplied UL records?
The UL record (UL-US-2575056-0, File E334233) covers models UKK80A, UKK125A, UKK160A, UKK160A-SK, UKK250A, UKK400A, and UKK500A.
6. Is the UKK6 series UL certified?
Based on the currently available documentation screenshots, the UKK6 series is certified by TÜV Rheinland under EN 60947-7-1:2009. Separate supporting documentation or official UL directory checks are required to confirm any UL component recognition for specific UKK6 models.
7. What does UL 1059 Ed.6 mean for a terminal block component?
UL 1059 Edition 6 is the standard governing terminal blocks, establishing safety, spacing, mechanical strength, and electrical performance requirements for components intended for factory installation in electrical equipment.
8. Does a UL-certified component make an entire control panel UL certified?
No. Component recognition (XCFR2) indicates that the part is qualified for use within an assembled system. The complete control panel must be evaluated and certified as an assembly in accordance with applicable panel standards (such as UL 508A).
9. How do I verify the certificate for a specific model?
Verify model numbers and ratings directly against the official TÜV Rheinland certificate numbers or the UL online certs directory using File Number E334233, alongside manufacturer-provided datasheets.
10. What ratings should I check when selecting a power distribution block?
Key parameters include rated current (Ith), rated insulation voltage (Ui), maximum conductor cross-section compatibility, tightening torque, and environmental ratings.
Conclusion
Choosing LEIPOLE power distribution terminal blocks ensures robust performance across industrial electrical distribution networks, provided that exact series ratings and certification scopes are carefully verified. Because documentation scopes vary—ranging from EN 60947-7-1 compliance for the UKK6 series to specific UL 1059 component recognitions for selected UK and UKK models—engineers and procurement specialists must match part numbers precisely to project requirements.
To request detailed product datasheets, original TÜV certificates, official UL records, or application-specific engineering support, please contact LEIPOLE directly or explore the LEIPOLE Power Distribution Blocks Product Page.