NEMA Terminal Blocks
Ultra Heavy Duty
D
ESCRIPTION
/A
PPLICATION
This Ultra Heavy Duty line includes
two series. The 400 series is rated up
to 270 A; the 444 series is rated up to
455 A.
400 SERIES
ULTRA HEAVY DUTY
D
ESIGN
A
DVANTAGES
400 Series
• Compact 2/0 or 250 kcmil (MCM)
block - at least 57 circuits per 6
foot length, 1-3/16" center-to-
center spacing.
• High current capacity snap-fit
sectional block— tubular contacts
accept single or combinations of
wire sizes as large as 250 kcmil
(MCM).
• Two contact styles available; rated
up to 270 amperes for copper wire.
• Allen head screws allow maximum
torque when using large wire sizes.
• Withstand voltages in excess of
IEEE switchgear standards for 750
volts. Meet clearance and creepage
spacing specified in UL, CSA, and
NEMA Industrial Control Standards
for 600 volts.
• Same block directly mounts on
surface or channel mounts.
• Only one end section needed per
block assembly.
• Readily identify circuits—order
blocks with painted marking area or
use removable vinyl marking strip.
Preprinted marking strips are also
available.
• Factory
available.
assembled
blocks
• Allen head screws allow maximum
torque on large wire sizes.
• Withstand voltages in excess of
IEEE switchgear standards for
2.000 volts.
• Conservatively rated at 455
amperes for copper wire, 370
amperes for aluminum wire.
• Housing design permits mounting
adjacent blocks with common
hardware — may be ganged for
multiple
circuit
requirements
maintaining centerlines.
• No end sections needed — each
circuit is totally self-contained.
Reduces inventory requirements.
• Ultra Heavy Duty phenolic block
sections do not snap-fit with other
block styles.
444 Series
• Massive block for extraordinarily
heavy duty applications—use AWG
wire sizes #4 thru 600 kcmil (MCM).
LR25557
E63810
Thomas & Betts Electronics/OEM Division Tel: 901-252-5000 Fax: 901-252-1312
293
NEMA Terminal Blocks
Ultra Heavy Duty
400 SERIES
ULTRA HEAVY DUTY
600V, 1.19" PITCH
P
HYSICAL
P
ROPERTIES
Housing:
H
OUSING
M
ATERIAL
:
Phenolic, filled flame retardant
F
LAMMABILITY
:
UL94V-1
C
OLOR
:
Black
Contacts:
M
ATERIAL
:
Electrical grade copper conductor;
plated steel screws resist corrosion
T
UBULAR
S
CREW
T
YPE
:
Small: 1/2" - 13 Hex
Large: 3/4" - 16 Hex socket set screw
Mechanical:
P
ITCH
(
TERMINAL SPACING
):
1.19"; 9 circuits/foot
W
IRE
S
TRIP
L
ENGTH
:
Tubular Screw (small): 1"
Tubular Screw (large): 1"
E
LECTRICAL
P
ROPERTIES
M
AXIMUM
C
URRENT
:
255A for a single 250MCM
wire
O
PERATING
V
OLTAGE
:
Blocks meet 600V creepage
and clearance requirements; withstand voltage
greatly exceeds standards for 750V
W
IRE
R
ANGE
:
Tubular Screw (small): #12-#2/0
AWG solid or stranded; Tubular Screw (large) #6
AWG-250 kcmil (MCM) solid or stranded
D
IELECTRIC
S
TRENGTH
(RH 40% @
SEA LEVEL
):
300
V/mil thickness per ASTM D149
B
REAKDOWN
V
OLTAGE
, AC, 60HZ:
Contact to Contact: 10,000V
Contact to Ground: 10,000V
UL H
IGH
V
OLTAGE
A
RC
T
RACKING
(
IN
./
MIN
.):
.49-.58
E
NVIRONMENTAL
P
ROPERTIES
M
AX
. C
ONTINUOUS
T
EMPERATURE
:
150˚ C (302˚ F)
W
ATER
A
BSORPTION
(24
HRS
. %
WT
.
GAIN
):
.45%
per ASTM D149
C
HEMICAL
R
ESISTANCE
:
Resistant to acids, alkalies,
and aliphatic hydrocarbons and ketones per
ASTM D543
R
ADIATION
R
ESISTANCE
(
ERGS G
-1
(C):
2.7 x 10
8
NOTE:
For Direct
Mounting, use #10
pan head screws
every six circuits.
recommended torque:
15-20 lbs.-ins.
Ordering Information
CATALOG
#
416
426-BU
417
427-BU
430-BU
DESCRIPTION
Tubular Screw, Unpainted
Tubular Screw, Painted
Tubular Screw, Painted
Tubular Screw, Unpainted
End Section
WIRE
RANGE
#12-2/0
#12-2/0
#6-250 Kcmil/MCM
#6-250 Kcmil/MCM
—
UL I
NDEPENDENT
T
ESTING
S
ERVICE
R
ECOGNITIONS
:
T
UBULAR
S
CREW
:
Catalog # 416 & 426-BU
1 #2/0 AWG, 1 #1/0 AWG, 1 #1 AWG,
1 or 2 #2 AWG, 1 to 3 #4 AWG, 1 to 3 #6 AWG,
1 to 4 #8 AWG, 1 to 6 #10 AWG, 2 to 8 #12 AWG,
T
UBULAR
S
CREW
:
Catalog # 417 & 427-BU
1 #250kcmil (MCM), 1 #4/0 AWG, 1 #3/0 AWG,
1 or 2 #2/0 AWG, 1 or 2 #1/0 AWG, 1 or 2 #1 AWG,
1 to 3 #2 AWG, 1 to 4 #4 AWG, 1 to 5 #6 AWG
LR25557
E63810
Thomas & Betts Electronics/OEM Division Tel: 901-252-5000 Fax: 901-252-1312
Dimensions shown are for reference only. Dimensions are in inches.
294
NEMA Terminal Blocks
Ultra Heavy Duty
400 SERIES
ULTRA HEAVY DUTY
ACCESSORIES
MOUNTING CHANNEL
CHANNEL CLAMPS
STEEL
CHANNEL
BREAK
AWAY
STEEL
PRE-PUNCHED
ALUMINUM
CHANNEL
ELEVATED
ALUMINUM
CHANNEL
SCREW
CHANNEL
CLAMPS
UNIVERSAL
CLAMPS
SNAP-IN
CLAMPS
Catalog Number
60
63-BU
6 feet
3 feet
60-B-36
64
67
6 feet
3 feet
60-SO
61
68
62
Standard Package
3 feet
6 feet
100
100
100
MARKING ACCESSORIES
PLASTIC
CLOTH
TAPE
VINYL
MARKING
STRIPS
ELEVATED
MARKING
STRIP
HOLDING
SCREW
MARKING
PEN
NOTES:
For factory assembled blocks on channel, prefix catalog #
with “0” and suffix with number of blocks desired. Without
channel (maximum of 6 sections) delete “0”.
Example: Ten tubular screw sections preassembled on
channel = 041710
For unpainted factory assembled blocks supplied with a
removable marking strip add -1 to catalog number.
For blocks with two or more different contact sections,
imprinted marking strips or special features; consult
factory.
Catalog Number
55-BU
50 feet
50-BU
25 feet
52-BU
18 inches
53-BU
1 Gross
99-BU
12
Standard Package
Thomas & Betts Electronics/OEM Division Tel: 901-252-5000 Fax: 901-252-1312
Dimensions shown are for reference only. Dimensions are in inches.
295
NEMA Terminal Blocks
Ultra Heavy Duty — 600 MCM
SERIES 444
ULTRA HEAVY DUTY — 600 MCM
600 V, 2.38" PITCH
P
HYSICAL
P
ROPERTIES
Housing:
H
OUSING
M
ATERIAL
:
Phenolic, filled flame retardant
F
LAMMABILITY
:
UL94V-1
C
OLOR
:
Black
Contacts:
M
ATERIAL
:
Aluminum alloy electro-tin plated for
compatibility with aluminum or copper conduc-
tors; tin plated brass screws
S
CREW
T
YPE
:
15/16" — 16 Hex Socket Set Screw
(“T” type allen wrench is recommended)
Mechanical:
P
ITCH
(
TERMINAL SPACING
):
2.38" (5 circuits per
foot)
W
IRE
S
TRIP
L
ENGTH
:
1-3/8"
E
LECTRICAL
P
ROPERTIES
M
AXIMUM
C
URRENT
:
455A (single 600 KCmil
(MCM) copper wire)
O
PERATING
V
OLTAGE
:
Blocks meet 600V creepage
and clearance requirements; withstand voltage
greatly exceeds standards for 2000V
W
IRE
R
ANGE
:
#4 AWG-600KCmil (MCM), solid or
stranded, AL or CU
D
IELECTRIC
S
TRENGTH
(RH40% @
SEA LEVEL
):
300
volts/mil thickness per ASTM D149
B
REAKDOWN
V
OLTAGE
, AC, 60HZ:
Contact to Contact: 10,000V
Contact to Ground: 10,000V
UL H
IGH
V
OLTAGE
A
RC
T
RACKING
(
IN
./
MIN
.):
.49-.58
E
NVIRONMENTAL
P
ROPERTIES
M
AX
.
CONTINUOUS
T
EMPERATURE
:
150˚ C (302˚ F)
W
ATER
A
BSORPTION
(24
HRS
. %
WT
.
GAIN
):
.45% per
ASTM D149
C
HEMICAL
R
ESISTANCE
:
Resistant to acids, alkalies,
and aliphatic hydrocarbons and ketones per
ASTM D543
R
ADIATION
R
ESISTANCE
(
ERGS G
-1
(C):
2.7 x 10
8
Ordering Information
CATALOG
#
444
DESCRIPTION
Tubular Screw
UL I
NDEPENDENT
T
ESTING
S
ERVICE
R
ECOGNITIONS
:
W
IRE
S
IZES
, AL
OR
CU:
1 #600 kcmil (MCM), 1 #500
kcmil (MCM), 1 #400 kcmil (MCM), 1 #350 kcmil
(MCM), 1 #300 kcmil (MCM), 1 #250 kcmil (MCM),
1 #4/0 AWG
T
UBULAR
S
CREW
:
1 or 2 #3/0 AWG, 1 to 3 #2/0 AWG,
1 to 4 #1/0 AWG, 1 to 4 #1 AWG, 1 to 6 #2 AWG,
1 to 10 #4 AWG
LR25557
E63810
Thomas & Betts Electronics/OEM Division Tel: 901-252-5000 Fax: 901-252-1312
Dimensions shown are for reference only. Dimensions are in inches.
296
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