PowerPanels
IEC 61439 Compliant Solutions

Type Tested Power Panels

Your definitive engineering resource for type tested panel design, IEC 61439 compliance, and industrial power distribution. From fundamentals to advanced design — learn, reference, build.

Type Tested Panels
Understanding IEC 61439 type testing, design verification, and routine verification for panel assemblies.
Panel Types
Comprehensive guides on MDB, MCC, PCC, VFD panels, ATS, and all major panel categories.
Engineering Guides
Deep technical knowledge on busbar design, thermal management, protection coordination, and more.
Standards & Compliance
IEC 61439 series, ATEX, marine classification, arc flash protection, and international standards explained.

Panel Types

Explore our comprehensive panel type guides

Main Distribution Board (MDB)
Central power distribution unit that receives incoming supply and distributes it to sub-circuits via protective devices.
Power Control Center (PCC)
High-capacity switchgear assembly for centralized control and distribution of electrical power in industrial facilities.
Motor Control Center (MCC)
Centralized assembly of motor starters, variable drives, and protection devices for coordinated motor control.
Automatic Power Factor Correction Panel (APFC)
Automatically switches capacitor banks to maintain power factor near unity and reduce reactive power penalties.
Automatic Transfer Switch Panel (ATS)
Monitors power sources and automatically transfers load between mains and backup supply during outages.
Variable Frequency Drive Panel (VFD Panel)
Houses VFD units with input/output filtering, protection, and bypass circuits for precise motor speed control.

Standards & Compliance

IEC 61439 and international standards explained

IEC 61439-1 — General Rules for Low-Voltage Switchgear Assemblies
Defines general requirements, definitions, and design verification methods applicable to all types of low-voltage switchgear and controlgear assemblies.
IEC 61439-2 — Power Switchgear and Controlgear Assemblies (PSC)
Specifies requirements for power switchgear and controlgear assemblies including type-tested and partially type-tested designs.
IEC 61439-3 — Distribution Boards (DBO)
Covers distribution boards intended for operation by ordinary persons, with rated current up to 250 A.
IEC 61439-4 — Assemblies for Construction Sites (ACS)
Defines particular requirements for assemblies designed for temporary use on construction sites.

Engineering Guides

Deep technical knowledge for panel engineers

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Understanding IEC 61439: The Complete Guide
A comprehensive overview of the IEC 61439 standard series that replaced IEC 60439 for low-voltage switchgear assemblies.
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IEC 61439 vs IEC 60439: Key Differences Explained
Explains the critical differences between the withdrawn IEC 60439 and its replacement IEC 61439, including the shift from TTA/PTTA to design verification.
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Design Verification Methods in IEC 61439
Details the three design verification methods—testing, calculation, and design rules—used to prove compliance with IEC 61439.
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Forms of Internal Separation (Form 1 to Form 4b)
Explains the forms of internal separation in switchgear assemblies from Form 1 (no separation) through Form 4b (full compartmentalization).
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Type Testing vs Routine Testing of Switchgear Assemblies
Clarifies the difference between type tests performed on representative samples and routine tests performed on every manufactured assembly.
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IP Protection Ratings for Electrical Panels
Guide to selecting the correct IP rating for panel enclosures based on installation environment and safety requirements.

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