Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com25
280 Series
Corrib®Fixed and Adjustable
Vitreous Enamel Power Resistors
SPECIFICATIONS
Material
Coating: Lead free vitreous enam-
el except for extreme low resist-
ance 35 watt models, and very
large models (1000 watts and
up), which are supplied in
Silicone Ceramic.
Core: Tubular Ceramic.
Terminals: Tinned lug with hole.
Adjustable Lug: Supplied with
adjustable 300 watt models. Part
No. 1974-A or 1974-B.
Electrical
Tolerance: ±10% (K)
Power rating: Based on 25°C free
air rating.
Derating: Linearly from
100% @ +25°C to 0%
@ +400°C.
Overload: 10 times rated wattage
for 5 seconds.
Temperature coefficient:
±400 ppm/°C.
Dielectric withstanding voltage:
1000 VAC measured from termi-
nal to mounting bracket.
To calculate max. amps: use the
formula √P/R
0.02 –––R02 ✜
0.04 –––R04 ✜
0.06 –––R06 ✜
0.08 –––R08 ✜
0.1 –––410 ✜✙✙
0.12 –––R12 ✙✔
0.15 –––R15 ✜
0.16 –––R16 ✜✙
0.2 –––R20 ✜✔✙
0.25 –––R25 ✜✔✙
0.3 –––R30 ✜
0.31 –––R31 ✙✙
0.4 –––R40 ✜✔✔
0.5 –––R50 ✜✙✙
0.6 –––R60 ✜
0.63 –––R63 ✔✔
STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES
0.8 –––R80 ✜✜✔
1.0 –––1R0 ✜✔✙
1.2 –––1R2 ✙✜
1.25 –––1R25 ✜
1.6 –––1R6 ✙✔
2.0 –––2R0 ✙✔
2.5 –––2R5 ✔✔
3.1 –––3R1 ✙✙
4.0 –––4R0 ✙✙
5.0 –––5R0 ✔✙
6.3 –––6R3 ✙✙
8.0 –––8R0 ✙✙
10.0 –––10R ✙✙
12.0 –––12R ✙✙
16.0 –––16R ✙✙
20.0 –––20R ✙✙
100.0 –––100
*Substitute "C" in prefix with "E"
for adjustable versions. ✙= Most popular stock values
✔= Stock values
✜= Non-stock values subject to mini-
mum handling charge per item
Mounting
Part No. No. of Derating
Slotted Elongated Resistors %
6110-81/26126-P-81/21 100%
-6127-P-81/22 83%
-6128-P-81/23 80%
-6129-P-81/24 80%
Extra Adjustable Lugs for
300 Watt Adjustable Corrib
Part For 300 Watt
No. Adjustable Corrib
E300KR10 - E300KR63
1974-A E300K1R0 - E300K5R0
E300K8R0 - E300K20R
1974-B E300KR10 - E300KR31
E300KR80 & E300K6R3
RESISTOR HARDWARE
Other Available Sizes (Partial List)
Prefix* Wattage Core Length Core O.D. Min. Ohms Max. Ohms
C90 90 4.0" 0.563" 0.021 12
C100 100 3.5" 0.75" 0.021 11
C110 110 5.0" 0.563" 0.029 16
C135 135 6.0" 0.563" 0.028 21
C150 150 5.0" 1.0" 0.043 27
C160 160 6.0" 0.75" 0.038 26
C180 180 6.5" 0.75" 0.031 29
C190 190 6.0" 1.0" 0.056 35
C215 215 7.0" 1.0" 0.068 43
C220 220 6.0" 1.125" 0.063 39
C270 270 5.0" 1.5" 0.065 41
C375 375 10.5" 1.125" 0.130 80
C500 500 10.5" 1.625" 0.190 117
C750 750 12.0" 2.5" 0.310 198
C1000 1000 15.0" 2.5" 0.410 258
C1500 1500 20.0" 2.5" 0.560 358
1.125 in.
28.58 mm
0.500 in. ±.030
12.7 mm ±.79
Diam.
0.196 in. +.015/-.006
4.979 mm +.381/-.153
8.5 in.
215.90 mm
0.25 in.
6.35 mm
0.75 in.
19.05 mm
0.032 in.
0.813 mm
min.
0.75 in.
19.05 mm
Fixed/Adjustable
300 watt*
* for values over 0.16Ω, terminal dimensions same as 35 watt at above.
0.563 in.
14.288 mm
2.0 in.
50.80 mm
0.375 in.
9.525 mm 0.094 in.
2.381 mm
0.625 in.
15.88 mm
Diam.
0.173 in.
4.394 mm
0.3125 in.
7.938 mm
Fixed
35 watt
Also available in low cost Centohm coating. Consult Factory.
Corrib®resistors are ideal for
applications involving high cur-
rents at very low resistance
values—as low as 0.1Ωfor the
300 Watt units. These large,
heavy-duty resistors are
designed to withstand frequent
start-stop cycles characteristic
of motor starting, dynamic
braking and other similar appli-
cations. Special order units are
available to accommodate up
to 1500 watts.
Corribs®are manufactured
with corrugated resistive wire.
To accelerate cooling, the wire
is securely fused to the ceram-
ic core by the protective vitre-
ous enamel coating to improve
durability Corrib resistors are
hollow-core units which can be
securely fastened to chassis
surfaces with thru bolts and
brackets.
FEATURES
• Ribbed construction aids in rapid
cooling.
• Designed for equipment requir-
ing low resistance loads at low
ohmic values and high current
capacity.
• Especially constructed for motor
starting, dynamic braking, etc.
Part No.
Prefix ➤
Suffix
➤
Wattage
Ohmic value
C35K ––– 35
C300K–––300
E300K–––300
(Adjustable)
Part No.
Prefix ➤
Suffix
➤
Wattage
Ohmic value
C35K ––– 35
C300K–––300
E300K–––300
(Adjustable)
Includes 2 each bracket,
bolt, washers (centering,
mica, lock) and nut. Note:
Single unit mounting con-
tains 1 each bolt and nut; 2
each all Washers.
Thru Bolts Mounting Brackets for 300 Watt Corrib
