New Cooper Bussmann
Power Distribution Blocks
With High SCCRs
• NEW 2005 NEC®And UL508A SCCR Marking
Requirements
The following equipment must be marked with an assembly SCCR:
• Industrial Control Panels [409.110]
• Industrial Machinery Electrical Panels [670.3(A)]
• Certain HVAC Equipment [440.4(B)]
• Meter Disconnect Switches [230.82(3)]
• Certain Motor Controllers [430.8]
This SCCR is based on the lowest-rated component, or weakest link,
in the assembly. Unmarked power distribution blocks will default to a
rating of 10kA.
• High Component SCCRs – Up To 200kA
PDBs are often an assembly’s lowest-rated component, or
“weak
link,”
and may limit the assembly SCCR to only 10kA. Eliminate
this
weak link
with these new, higher-rated PDBs.
• Agency Listed
These new higher-rated PDBs are listed to UL1953 and can be
used in UL508A panels for both feeder and branch circuit
applications.
• Expand Installation Flexibility
Equipment with low SCCRs are limited to locations where
only low-level short-circuit current is available. By replacing
a low-rated PDB with a new Cooper Bussmann high
SCCR PDB, an assembly can achieve a higher SCCR
for more installation flexibility.
• NEW 2005 NEC®
Requirements For Wireways
These new listed power distribution blocks can be
used to meet the new 2005 NEC®requirement in
section 376.56(B) for wireways.
Increase Assembly
Short-Circuit Current
Ratings
Power Distribution Block
©2006 Cooper Bussmann • St. Louis, MO 63178
636-394-2877 • www.cooperbussmann.com
Printed in USA Reorder # 3134 4-06-7.5M
Cooper Bussmann UL
Listed PDBs With High
SCCRs
Get The High Assembly SCCR You Desire
Listed to UL1953, with high SCCRs up to 200kA, these
PDBs can replace a low-rated PDB to achieve a higher
assembly SCCR.
Catalog SCCR
Numbers Wire Range (Load-Side Terminals
(- # of Poles) Line Load Wire Range) Maximum Fuse Size Amps Line / Load
PDB204-1, -3 2/0 – #8 Cu 2/0 – #8 Cu 200kA 200A Class CC, G, J, T 175A
PDB220-1, 3 2/0 – #8 Cu (4) #4 – #14 Cu 200kA (#4 - #12) 200A Class CC, G, J, T 175A
100kA (#4 - #14) 175A Class CC, G, J, T
PDB280-1, -3 2/0 – #8 Cu 1⁄4- 20 x 3⁄4stud 200kA 200A Class CC, G, J, T 175A
PDB321-1, -2, -3 2/0 – #8 Cu (6) #4 – #14 Cu 200kA (#4 - #12) 400A Class CC, G, J, T 175A
100kA (#4 - #14) 175A Class CC, G, J, T
PDB323-1, -3 350kcmil – #4 Cu (6) #4 – #12 Cu 200kA (#4 - #8) 400A Class CC, G, J, T 310A
100kA (#4 - #12) 175A Class CC, G, J, T
PDB370-1, -3 350kcmil – #4 Cu (12) #4 –#14 Cu 200kA (#4 - #8) 400A Class CC, G, J, T 310A
100kA (#4 - #14) 175A Class CC, G, J, T
PDB371-1, -3 350kcmil – #4 Cu (6) #2 – #12 Cu; 200kA (1/0 - #6) 400A Class CC, G, J, T 310A
(3) 1/0- #12 Cu 100kA (#4 - #12) 175A Class CC, G, J, T
Top
Side
A
B
C
D
E
F
AD
B
E
C
F
PDB323-3, PDB370-3, PDB371-3
PDB204-3, PDB220-3, PDB280-3
3-pole A
C
2-pole A
1-pole A
FD
BE
Top
Side
PDB321-1, PDB321-2, PDB321-3
Dimensions — in (mm)
A
BC
C
B
A
E
E
F
F
PDB323-1, PDB370-1, PDB371-1
PDB204-1, PDB220-1, PDB280-1
Side
Top
Catalog Numbers A B C D E F (Hole)
PDB204-3, PDB220-3, PDB280-3 4.27 (108.3) 2.88 (73.2) 2.13 (54.0) 1.62 (41.1) 2.25 (57.2) 0.22 (5.7)
PDB323-3, PDB370-3, PDB371-3 6.00 (152.4) 5.50 (139.7) 3.70 (93.9) 3.25 (82.6) 4.75 (120.7) 0.22 (5.7)
PDB323-1, PDB370-1, PDB371-1 1.96 (49.8) 3.38 (85.7) 3.32 (85.7) — 0.21 (2.5) X 0.41 (10.4)
PDB204-1, PDB220-1, PDB280-1 1.07 (27.2) 2.88 (73.2) 1.75 (44.5) 2.25 (57.2) 0.20 (5.1)
PDB321-1 1.96 (49.8) 4.00 (101.6) 3.32 (84.3) 1.62 (41.1) 3.37 (85.6) 0.21 (5.3) X 0.41 (10.4)
PDB321-2 3.58 (90.9) 4.00 (101.6) 3.32 (84.3) 1.62 (41.1) 3.37 (85.6) 0.21 (5.3) X 0.41 (10.4)
PDB321-3 5.20 (132.1) 4.00 (101.6) 3.32 (84.3) 1.62 (41.1) 3.37 (85.6) 0.21 (5.3) X 0.41 (10.4)
