Ohmite E300KR12E Ribbed construction aids in rapid cooling Datasheet

280 Series
Corrib® Fixed and Adjustable
Vitreous Enamel Power
Corrib® resistors are ideal for applications involving
high currents at very low resistance values—as low
as 0.1Ω for the 300 Watt unit. These large, heavyduty resistors are designed to withstand frequent
start-stop cycles characteristic of motor starting,
dynamic braking and other similar applications.
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 ceramic core by the protective vitreous
enamel coating to improve durability. Corrib resistors are hollow-core units which can be securely
fastened to chassis surfaces with thru bolts and
brackets.
F e at u r e s
• Also available in Centohm or Silicone coating.
Consult Ohmite.
• Ribbed construction aids in rapid cooling.
• Designed for equipment requiring low resistance
loads at low ohmic values and high current capacity.
• Especially constructed for motor starting, dynamic
braking, etc.
• RoHS compliant product available. Add “E” suffix to
part number to specify.
characteristics
Coating Lead free vitreous enamel except for extreme
low resistance 35 watt models, and very large
models (750 watts and up), which are supplied
in Silicone Ceramic
Core
Tubular Ceramic
Terminals Tinned lug with hole. RoHS solder composition
is 96% Sn, 3.5% Ag, 0.5% Cu
Adjustable Lug Supplied with adjustable 300 watt models. Part
No. 1974-A or 1974-B
Resistance Max. 63Ω for 300W version
Tolerance ±10% (K)
Resistor hardware
Thru Bolts Mounting Brackets for
Lugs for 300 Watt
300 Watt Corrib
Adjustable Corrib
Includes two each bracket, bolt,
Part No.
Res. Part No.
washers (centering, mica, lock) and 1974-A 0.40 1974-B
1/16 wire
1/8 wire
0.50
nut. Note: Single unit mounting
0.63
contains one each bolt and nut; two 1.00
1.50
each all washers.
Part No.
No. of
Slotted
Elongated
Resistors
6110-81/2
Moun.
Derat.
%
6126-P-81/2
1
100%
-
6127-P-81/2
2
83%
-
6128-P-81/2
3
80%
-
6129-P-81/2
4
80%
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
1.60
2.00
2.50
3.10
4.00
5.00
6.30
8.00
10.00
12.00
16.00
20.00
25.00
30.00
48.00
50.00
Res.
0.10
0.12
0.16
0.20
0.25
0.31
0.80
1.20
Temperature ±400 ppm/°C
coefficient
Dielectric withstanding voltage
1000 VAC measured from terminal to mounting
bracket
To calculate use the formula √P/R
max. amps
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
115
280 Series
Corrib® Fixed and Adjustable
Vitreous Enamel Power
dimensions
C
D
L
Core and Terminal Selection for Made to Order Type
Free Air
Wattage
Rating D: OD
Code
for
Term.
Core Ohms
Dia. Min. Max. Type
Core Dimensions
C: ID
L: Length
1500
1000
750
380
2.50”
(63.5mm)
1.75”
(44.45mm)
20.0” (508.00mm)
15.0” (381.00mm)
12.0” (304.80mm)
6.0” (152.40mm)
S
S
S
S
0.56
0.41
0.31
0.13
358
258
198
78
45
550
500
400
1.625”
(41.28mm)
1.125”
(28.58mm)
11.75” (298.45mm)
10.50” (266.70mm)
8.5” (215.90mm)
R
R
R
0.21
0.19
0.14
133
117
91
45
270
1.50”
(38.10mm)
1.125”
(28.58mm)
5.0” (127.00mm)
Q
0.065
41
45
395
375
300
220
185
155
140
1.125”
(28.58mm)
0.75”
(19.05mm)
11.25” (285.75mm)
10.5” (266.70mm)
8.5” (215.90mm)
6.0” (152.40mm)
5.0” (127.00mm)
4.25” (107.95mm)
4.0” (101.6mm)
P
P
P
P
P
P
P
0.14
0.13
0.099
0.063
0.05
0.038
0.04
87
80
63
39
30
25
20
45
Free Air
Wattage
Rating D: OD
Core Dimensions
C: ID
L: Length
Code
for
Core Ohms
Dia. Min. Max.
315
215
190
150
125
1.00”
(25.40mm)
0.625”
(15.88mm)
10.0” (254.00mm)
7.0” (177.60mm)
6.0” (152.40mm)
5.0” (127.00mm)
4.0” (101.60mm)
N
N
N
N
N
0.11
0.068
0.056
0.043
0.031
67
43
35
27
19
45
180
160
140
105
100
0.75”
(19.05mm)
0.50”
(12.70mm)
6.5” (165.10mm)
6.0” (152.40mm)
5.0” (127.00mm)
4.0” (101.60mm)
3.5” (88.90mm)
M
M
M
M
M
0.031
0.038
0.028
0.020
0.021
29
26
20
14
11
45
135
110
90
35
0.563”
(14.30mm)
0.313”
(7.95mm)
6.0” (152.40mm)
5.0” (127.00mm)
4.0” (101.60mm)
2.0” (50.80mm)
K
K
K
K
0.028 21
0.029 16
0.021 12
0.0097 0.11
46
35
0.563”
(14.30mm)
0.313”
(7.95mm)
2.0” (50.80mm)
K
0.12
40
o r d e r i n g i n f o r m at i o n
Standard
Coating
Blank = Vitreous
C = Centohm
S = Silicone
Made-to-order
NOTE: Wattages above
750 watts come with
silicone coating.
116
See website for
custom core info
RoHS Compliant
Series Wattage Tolerance Ohms
K = 10% example:
C = Fixed
1R0 = 1Ω
E = Adjustable
250 = 250Ω
1K0 = 1,000Ω
25K = 25,000Ω
25K5 = 25,500Ω
Series
Wattage &
230 = Adjustable
Core Code
280 = Fixed
See “Core and
480 = Silicone fixed Terminal Selection”
680 = Centohm fixed
Terminal Type
See “Resistor
Terminals for
Tubular Cores”
Ohms
Example:
R0200 = 0.02 7
R2000 = 0.2 7
2R500 = 2.5 7
10R00 = 10 7
Standard part numbers for 280 series
C300KR10E
C300KR12E
C300KR20E
C300KR25E
C300KR31E
C300KR40E
C300KR50E
C300KR63E
C300K1R0E
C300K1R2E
C300K1R6E
Term.
Type
C300K2R0E
C300K2R5E
C300K3R1E
C300K4R0E
C300K5R0E
C300K6R3E
C300K8R0E
C300K10RE
C300K12RE
C300K16RE
C300K20RE
E300K10RE
E300K12RE
E300K16RE
E300K1R0E
E300K1R6E
E300K20RE
E300K2R0E
E300K2R5E
E300K3R1E
E300K4R0E
E300K5R0E
E300K6R3E
E300K8R0E
E300KR10E
E300KR12E
E300KR16E
E300KR20E
E300KR25E
E300KR31E
E300KR40E
E300KR50E
E300KR63E
E300KR80E
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
Tolerance
F = 1%
H = 3%
J = 5%
K = 10% (std.)
5.6
46
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