required per UL 508A for feeder circuit applications
and per NEC for field installations.
To increase application flexibility, these blocks
feature dual-wire rated ports that accept copper or
aluminum conductors while retaining a UL Listed
status.
Optional covers are available to enhance electrical
safety.
Specifications:
Ratings
•
•
•
Volts: 600 V
Amps: 175 to 310 A
SCCR: 200 kA (see table for circuit protection
details)
Flammability rating
•
UL 94 V0
Storage and operating temperature range
•
-4°F to 248°F (-20°C to 120°C)
Agency information
•
•
UL 1953 Listed, Guide QPQS, File E256146
CSA
®
Certified, Class 6228-01, File 47235
Stranded 75°C copper and aluminum
Higher temperature rated conductors permitted
with appropriate derating
Conductors
†
•
•
†
As specified in the catalog number table.
Technical Data 10537
Effective August 2016
UL Listed power distribution blocks
Catalog numbers:
Lineside
Line/load port
configuration
No. of
poles
Current Wire size
rating
(Str/ferrule unless
(A)
noted)*
2/0 - #1 Cu/Al (Str)
#2 - #3 Cu/Al
#4 - #8 Cu/Al
1, 3
175
#10 - #12 Al (Str)
#10 - #14 Cu
#4 - #8 Cu/Al
#10 - #14 Cu
2/0 - #1 Cu/Al (Str)
1, 3
175
#2 - #3 Cu/Al
#4 - #8 Cu/Al
#10 - #14 Cu
2/0 - #1 Cu/Al (Str)
1, 3
175
#2 - #3 Cu/Al
#4 - #8 Cu/Al
#10 - #14 Cu
2/0 - #1 Cu/Al (Str)
#2 - #3 Cu/Al
1, 2, 3
175
#4 - #8 Cu/Al
#10 - #12 Al (Str)
#10 - #14 Cu
350kcmil - 2/0 Cu/Al (Str)
1, 3
310
1/0 Cu/Al (Str)
#1 - #6 Cu/Al
350kcmil - 2/0 Cu/Al (Str)
1, 3
310
1/0 Cu/Al (Str)
#1 - #6 Cu/Al
Wires
per
port
1
1
1
1
1
2
2
1
1
1-2
1-2
1
1
1-2
1-2
1
1
1-2
1
1-2
1
1-2
1-2
1
1-2
1-2
31.1 (275)
†
1
31.1 (275)
†
1
13.6 (120)
1
#4 - #6 Cu/Al (Str)
#8 Al (Str)
#8 Cu
#10 - #12 Al (Str)
#10 - #14 Cu
#4 - #6 Cu/Al (Str)
#8 Al (Str)
#8 Cu
#10 - #12 Al (Str)
#10 - #12 Cu
#10 - #14 Cu
#4 - #6 Cu/Al (Str)
#8 Al (Str)
#8 Cu
#10 - #12 Al (Str)
#10 - #14 Cu
#2 - #3 Cu/Al (Str)
#4 - #8 Al (Str)
350kcmil - 2/0 Cu/Al (Str)
1
#6 - #8 Al (Str)
#4 Cu
#6 Cu
#8 Cu
1, 3
310
1/0 Cu/Al (Str)
1-2
31.1 (275)
†
1
#10 - #12 Cu
#14 Cu
1/0 - #3 Cu/Al (Str)
#4 - #6 Cu/Al
#8 Cu/Al
#1 - #6 Cu/Al
1-2
#10 - #12 Cu
#6 - #14 Cu
#4 - #6 Al (Str)
1
1-2
1
1
1-2
1
1-2
1
1
1
2
1
1-2
1
1
1-2
1
1
2
1
1-2
1-2
1-2
2
1
1
1
1
2
2
5.1 (45)
4.5 (40)
4.0 (35)
5.6 (50)
5.1 (45)
††
4.5 (40)
††
4.0 (35)
††
13.6 (120)
3
200
PDB371-_
6
5.6 (50)
4.0 (35)
2.8 (25)
4.0 (35)
2.3 (20)
4.0 (35)
2.8 (25)
4.0 (35)
2.3 (20)
4.0 (35)
2.8 (25)
4.0 (35)
2.3 (20)
12
200
PDB370-_
6
200
PDB323-_
6
200
PDB321-_
13.6 (120)
1
1/4-20 x 3/4” Stud
—
—
1
200
PDB280-_
13.6 (120)
1
4.0 (35)
13.6 (120)
1
12.4 (110)
††
Loadside
Wire size
Torque
Ports/ (Str/ferrule unless
N•m (Lb-in) pole
noted)*
2/0 - #1 Cu/Al (Str)
#2 - #3 Cu/Al
#4 - #8 Cu/Al
#10 - #12 Al (Str)
#10 - #14 Cu
#4 - #8 Cu/Al
#10 - #14 Cu
#4 - #6 Cu/Al (Str)
#8 Cu
#8 Al (Str)
#10 - #14 Cu
Wires
per
Torque
Ports/
port
N•m (Lb-in) pole
1
1
1
1
1
2
2
1
1
1-2
1-2
4.0 (35)
13.6 (120)
4.0 (35)
2.8 (25)
2.3 (20)
4
200
PDB220-_
1
200
PDB204-_
12.4 (110)
††
Max
SCCR
(kA)**
Catalog
number
* 75°C wire (higher temperature rated wire acceptable with appropriate derating). Using a ferrule on a stranded conductor requires a correctly sized UL Listed ferrule
(customer supplied) applied according to the manufacturer’s specifications. Ferrule ratings apply to copper wire only.
** See pages 4 and 5 for the tested upstream overcurrent protective devices necessary for achieving these SCCRs.
† Torque rating for dual wire and ferrule application is 30.5 N•m (270 Lb-in).
†† Torque rating for ferrule application is 13.6 N•m (120 Lb-in).
2
Eaton.com/bussmannseries
UL Listed power distribution blocks
Technical Data 10537
Effective August 2016
Features and benefits
•
•
High SCCRs up to 200 kA, assist in achieving high SCCR for a
control panel per NEC and UL 508A requirements.
In compliance with UL 1953 minimum spacing requirements for
industrial control panel feeder and branch circuits.
Optional covers available to reduce the risk of accidental contact
with energized components.
Dual wire applications are only viable when using two wires of
the same size, stranding, and insulating and conductor material in
the same port.
Bussmann series PDB power distribution blocks are rated for use
with UL Listed ferrules (see catalog number table for details).
Ferrule applications allow for the use of a broader range of
conductor stranding and simulate a more efficient, solid wire
connection with the PDB terminal port.
Always use UL Listed ferrules in accordance with the
manufacturer’s specifications and instructions.
•
Ferrule terminal application
•
•
•
Dual wire port application
•
Rated for dual wire port application to increase the possible
number of lineside and loadside connections. E.g., PDB220 can
accept two wires into the lineside port (#4 - #14 Cu, #4 - #8 Al)
and two wires per port (eight connections per pole total) on the
loadside lug (#8 - #14 Cu, #8 Al).
•
Selecting SCCR power distribution blocks and terminal blocks
Short-circuit current rated power distribution blocks
Bussmann series power distribution blocks have three distinct
styles to match different application needs. There are the PDBFS_
and PDB_ high short-circuit current rated power distribution blocks
and the 16_ power terminal blocks. The differences are whether the
power distribution blocks are enclosed or not, and whether they are
UL 1953 Listed power distribution blocks or UL 1059 Recognized
power terminal blocks, which have different minimum spacing
requirements. The table on this page will assist you in selecting
which block is right for your application.
(NEC 670.3(A)), and HVAC equipment (NEC 440.4(B)) is required by
the NEC.
Power distribution and terminal blocks not marked with a component
SCCR are typically one of the weakest links in a control panel’s
equipment SCCR and may limit the equipment SCCR to no more
than 10 kA. The PDBFS_ and PDB_ products have the increased
spacing required for use in feeder circuits of equipment listed to
UL 508A (UL 1059 terminal blocks must be evaluated for proper
spacings). Also, for building wiring systems, the PDBFS_ and
PDB_ power distribution blocks can be used to meet the 2014 NEC
requirements in section 376.56(B) for power distribution blocks in
wireways.
See the last page of this data sheet for SCCR tools and resources to
help you further understand and solve your SCCR needs.
Why these are important
Per the NEC and OSHA, equipment cannot be installed in an
electrical system at a location where the available fault (short-circuit)
current is greater than the equipment’s SCCR.
Further, equipment SCCRs are required in the 2014 NEC and for UL
508A Listed control panels. Marking the equipment SCCR on control
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