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Distribution Blocks


Short-Circuit Current Rated (SCCR) Power Distribution Blocks

We offer distinctly different styles of short-circuit current rated (SCCR) power distribution blocks (PDBs) and terminal blocks (TBs) to match different application needs. The differences are whether the power distribution blocks are enclosed or not, and whether they are UL1953 Listed PDBs or UL1059 Recognized TBs, which have different minimum spacing requirements.

Why is this important?

  • Assembly short-circuit current ratings (SCCRs) are now required in the 2005 NEC and UL508A Listed Industrial Control Panels.
  • Marking the SCCR on Industrial Control Panels (NEC 409.110), Industrial Machinery Electrical Panels (NEC 670.3(A)), and HVAC equipment (NEC 440.4(B)) is now required by the National Electrical Code.
  • Power distribution blocks or terminal blocks not marked with an SCCR are typically one of the weakest links and may limit an assembly to no more than 10 kA SCCR.
  • The EPDB series and HPB series power distribution blocks have increased spacing required where used in feeder circuits in equipment listed to UL508A. The PB series UL1059 terminal blocks must be evaluated for proper spacing.
  • Also, for building wiring systems, the EPDB series and HPB series power distribution blocks can be used to meet the 2005 NEC requirements in section 376.56(B) for power distribution blocks in wireways.

Finger Safe 175A-760AFinger Safe 175A-760A
Use Finger-safe Power Distribution Blocks to manage your power distribution needs, from splitting primary power circuits into a variety of branch circuits to providing a fixed junction tap-off point.
  • UL 1953 Listed
  • Modular design to select and configure the number of poles required by each application
  • Engineered to allow copper conductors and maintain an SCCR rating of 200kA
  • Fully enclosed block for touch-safe isolation of live parts
  • IP20 rating under specific conditions
  • Integrated DIN-rail or direct panel mounting. (Panel mount only for EPDB306 and EPDB702)
  • Captive termination screws cannot be lost
  • Used in UL508A panels for both feeder and branch circuit applications
  • Suitable for both factory and field wiring
  • Tin-plated aluminum connectors suitable for copper conductors

Open Style 175A-310AOpen Style 175A-310A
Open-style Power Distribution blocks are a convenient way to manage your power distribution needs. Optional safety covers are available for added protection.
  • UL 1953 Listed
  • Engineered to maintain an SCCR rating of 200kA with copper conductors
  • Suitable for industrial control panel applications requiring high SCCR ratings
  • Suitable for installation in wireways (with optional cover)
  • Has minimum spacing requirements at 600VAC/DC of at least 1" through air and 2" over surface which meets UL 1953 requirements
  • Used in UL508A panels
  • Meets UL508A requirements and can be used in feeder and branch circuit applications
  • Tin-plated aluminum connectors suitable for copper conductors
  • Available safety covers for greater protection (purchase separately)
  • Suitable for both factory and field wiring
  • Panel mounting
  • Ampere ratings up to 310 Amps

Open Style 175A-760AOpen Style 175A-760A
Open-style Power Distribution blocks are a convenient way to manage your power distribution needs. Optional safety covers are available for added protection.
  • UL 1953 Listed
  • Engineered to maintain an SCCR rating of 200kA with copper conductors
  • Suitable for industrial control panel applications requiring high SCCR ratings
  • Suitable for installation in wireways (with optional cover)
  • Has minimum spacing requirements at 600VAC/DC of at least 1" through air and 2" over surface which meets UL 1953 requirements
  • Used in UL508A panels
  • Meets UL508A requirements and can be used in feeder and branch circuit applications
  • Tin-plated aluminum connectors suitable for copper conductors
  • Available safety covers for greater protection (purchase separately)
  • Suitable for both factory and field wiring
  • Panel mounting
  • Ampere ratings up to 310 Amps
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