NEMA Terminal Blocks
Medium Duty — Phenolic
D
ESCRIPTION
/A
PPLICATION
This family of phenolic blocks is ideal
for high temperature applications.
The rugged material withstands
temperatures up to 302˚ F (150˚ C).
500 SERIES MEDIUM DUTY
PHENOLIC
D
ESIGN
A
DVANTAGES
• Quick-connect contact sections
available - accept female 1/4 inch
(6.3mm) quick-connect terminals.
• Broad wire range - accept single or
combination of AWG sizes #22 up
to #8 solid or stranded, depending
on contact style selected.
• 20 to 50 amperes rating per circuit,
depending on contact style
selected - see selector chart for
specific ratings.
• Surface mounted flat base and
channel mounted dovetail base
models available.
• Packaged for rapid handling and
assembly - Snap-fit sections are
packed 100 per carton.
• Only one end section needed per
block assembly.
• Fanning Strips - interlocking
sectional fanning strips allow entire
circuit groups to be connected and
disconnected as a single unit.
• Select any of five contact styles -
including two types of quick
connect sections.
• Readily identify circuits - blocks
available with painted marking
surface or use removable vinyl
marking strip. Preprinted marking
strips are also available.
• Factory
available.
assembled
blocks
• Medium Duty phenolic block
sections snap-fit with 300 & 600V
nylon and poly., Heavy Duty,
Intermediate Heavy Duty, and Fuse
and Switch blocks.
LR25557
E63810
Thomas & Betts Electronics/OEM Division Tel: 901-252-5000 Fax: 901-252-1312
269
NEMA Terminal Blocks
Medium Duty — Phenolic
500 SERIES
300 V PHENOLIC
0.44" PITCH
HIGH TEMPERATURE
CHARACTERISTICS
STRAP SCREW
TUBULAR SCREW
TUBULAR CLAMP
QUICK CONNECT
Type of Block
Direct Mount (Flat Base)
Painted
Unpainted
Channel Mount (Dovetail Base)
Painted
Unpainted
Model
521-BU
511-BU
0521
0511
Model
524
514
0524
0514
Model
525
515-BU
0525
0515
Model
527
517
0527
0517
Contact Type
Specifications
Wire Range (AWG)
Solid & Stranded
Wire Strip Length (in.)
Screw Type
Ampacity
22-10
—
6-32
slotted binding head
35 A
18-8
11/
32
10-32
slotted pan head
50 A
22-10
11/
32
10-32
slotted pan head
30 A
22-12
—
—
20 A
End Sections
Direct Mount
Channel Mount
530-BU
0530
530-BU
0530
530-BU
0530
530-BU
0530
NOTE:
Standard package is 100 pieces for contact and 25 pieces for end sections.
NOTES:
For factory assembled blocks, suffix catalog number with
number of blocks desired. (Maximum number of flat base
preassembled sections is 12).
Example: Twenty-five sections of tubular clamp sections
preassembled on channel = 051525
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.
Comparison (Type of Block)
Direct Mount
(Flat Base)
Channel Mount
(Dovetail Base)
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.
270
NEMA Terminal Blocks
Medium Duty — Phenolic
TUBULAR SCREW
& QUICK CONNECT
TUBULAR
PHIL SLOT
CORROSION RESISTANT
STRAP SCREW
CORROSION RESISTANT
TUBULAR SCREW
CORROSION RESISTANT
TUBULAR CLAMP
Model
529
519
0529
0519
Model
524PS
514PS
0524PS
0514PS
Model
D521
D511
D0521
D0511
Model
D524
D514
D0524
D0514
Model
D525
D515
D0525
D0515
Contact Type
18-8 & 22-12
—
—
20 A
18-8
—
—
50 A
22-10
—
6-32 Nickel plated
Slotted Binding Head
35 A
18-8
11/
32
10-32 Nickel plated
Slotted Pan Head
50 A
22-10
11/
32
10-32 Nickel plated
Slotted Pan Head
30 A
530-BU
0530
530-BU
0530
530-BU
0530
530-BU
0530
530-BU
0530
NOTE:
Standard package is 100 pieces for contact and 25 pieces for end sections.
Ordering Information
CATALOG
#
54-BU
58
54100
DESCRIPTION
Tubular Screw
Strap Screw
Molding Only, no contact
STANDARD
PACKAGE
50
50
50
NOTES:
For factory assembled fanning strips, suffix catalog number with number
desired
Example: Ten factory assembled sections of #58 = 5810
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.
271
NEMA Terminal Blocks
Medium Duty — Phenolic
500 SERIES
ACCESSORIES
CHANNEL CLAMPS AND ACCESSORIES
JUMPERS
STEEL
CHANNEL
BREAK
AWAY
STEEL
PRE-PUNCHED
ALUMINUM
CHANNEL
ELEVATED
ALUMINUM
CHANNEL
SCREW
CHANNEL
CLAMPS
UNIVERSAL
CLAMPS
SNAP-IN
CLAMPS
SEE-THRU
COVER
GANGING
ROD
Catalog Number
60
63-BU
6 feet
3 feet
60-B-36
64
67
6 feet
3 feet
60-SO
61
68
62
57
30-BU
Standard Package
3 feet
6 feet
100
100
100
50
2 feet
MOUNTING CHANNEL
MARKING ACCESSORIES
JUMPER
FOR TUBULAR
CONTACTS
SNAP-APART
SPADE
JUMPER
SNAP-APART
FLANGED
JUMPER
SNAP-APART
RING TONGUE
JUMPER
PLASTIC
CLOTH
TAPE
PLASTIC
CLOTH
TAPE
VINYL
MARKING
STRIPS
ELEVATED
MARKING
STRIP
NYLON
HOLDING
PLUG
MARKING
PEN
Catalog Number
40-BU
100
J7140
40 ckt
J7240
40 ckt
J7340
40 ckt
66
1 sheet
55-BU
50 feet
50-BU
25 feet
52-BU
18 inches
65-BU
100
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.
272
NEMA Terminal Blocks
Medium Duty - Phenolic
500 SERIES
TECHNICAL DATA
Voltage Rating:
Blocks meet 300 volt creepage
and clearance requirements of NEMA, UL, and
CSA for general industrial control equipment and
panel boards. Withstand voltages greatly in
excess of IEEE switchgear standards for 750
volts. Quick connect Blocks retain 300V rating
with insulated female quick connects.
Housing:
M
ATERIAL
:
Phenolic; Filled, flame retardant
M
AXIMUM
S
ERVICE
T
EMP
.:
150ºC (302ºF)
B
REAKDOWN
V
OLTAGE
AC, 60H
Z
Contact to Contact: 6,600V (3,800V w/ Quick
Connect)
Contact to Ground: 9600V
D
IELECTRIC
S
TRENGTH
:
300 Volts/mil thickness per
ASTM D149 (25ºC-RH40% at Sea Level)
UL H
IGH
V
OLTAGE
A
RC
T
RACKING
T
EST
(I
NCHES
/
MIN
.):
.49-.58
W
ATER
A
BSORPTION
(24
HRS
. %
WT
.
GAIN
):
0.45%
per ASTM D570
F
LAMMABILITY
:
UL94V-1
C
HEMICAL
R
ESISTANCE
:
Resistant to acids, alka-
lines, and aliphatic hydrocarbons and ketones,
per ASTM D543.
R
ADIATION
R
ESISTANCE
(
ERGS G
-1 (C)):
2.7 x 10
8
C
OLOR
:
Black
Standard Contacts
Electrical grade copper or copper alloy conduc-
tor. Steel Screws. Tube and screws are plated to
resist corrosion in most industrial applications.
Environmental Contacts
(for highly corrosive atmospheres)
T
UBULAR
S
CREW
:
Electrical grade copper tube
with nickel plating. Nickel plated brass screws.
S
TRAP
S
CREW
:
Nickel plated brass straps and
screws. Nickel plating exceeds specification QQ-
N-290 Class I, Type VII. Maximum Width of Lugs
IS
5/16"
Group Circuits with Interlocking Fanning Strips
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.
273
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