Ohmite L12J4K7E Vitreous enamel power Datasheet

270 Series
Vitreous Enamel Power
C
D
See page 36
for mounting
hardware
L
Series
L12
L25
L50
L100
L175
L225
L500
L1000
Wattage
12
25
50
100
175
225
500
1000
F e a t u r es
S pec i f i c a t i o n s
• Terminals suitable for soldering
or bolt connection
• High wattage applications
• Rugged lead free vitreous enamel coating
• Flame resistant coating
• All-welded construction
• RoHS compliant available
• “Fast on” option – see terminal
538, page 37
Material
Coating: Lead free vitreous
enamel. Very large models (750
watts and up) are supplied in
Silicone Ceramic. Also available
in low-cost Centohm coating;
Consult factory.
Core: Tubular ceramic.
Terminals: Solder coated radial
lug. RoHS solder composition is
96% Sn, 3.5% Ag, 0.5% Cu
Derating: Linearly from 100% @
+25°C to 0% @ +350°C.
Electrical
Tolerance:
±5% 1Ω and over (J)
±10% under 1Ω (K)
Power rating: Based on 25°C free
air rating.
Overload: 10 times rated wattage
for 5 seconds.
Temperature coefficient:
1 to 20Ω: ±400 ppm/°C.
Above 20Ω: ±260 ppm/°C
Dielectric withstanding voltage:
1000 VAC: 12 to 100 watt rating.
3000 VAC: 175 to 225 watt rating (Measured from terminal to
mounting bracket)
To calculate max. amps: use the
formula √P/R
Dimensions (in. / mm)
L
D
C
1.75 / 44.4
0.313 / 7.94
0.188 / 4.76
2.0 / 50.8
0.562 / 14.3
0.313 / 7.94
4.0 / 101.6
0.562 / 14.3
0.313 / 7.94
6.5 / 165.1
0.750 / 19.1
0.50 / 12.7
8.5 / 215.9
1.125 / 28.6
0.75 / 19.1
10.5 / 266.7
1.125 / 28.6
0.75 / 19.1
12.0 / 304.8
2.50 / 63.5
1.75 / 44.5
20.0 / 508.0
2.50 / 63.5
1.75 / 44.5
Ohms
0.1-51K
0.15-100K
0.38-260K
0.23-101K
0.13-101K
0.16-129K
0.38-218K
0.69-392K
Core
Code
D
K
K
M
P
P
S
S
Standard
Terminal
57
40
40
40
46
46
45
45
Voltage
565
625
1625
2845
3595
4595
4970
8900
Non-Inductive versions available; Other sizes available; Also available in low cost Centohm or Silicone coating; Consult Ohmite.
* Maximum Voltage is based on Ohm’s Law [V=√P*R] as limited by the resistance value of specified product
Select 270 Type fixed resistors for applications requiring wattage ratings from 12 to 1000 watts.
The 270 Type resistors are equipped with lug terminals suitable for soldering or sturdy bolt connection. When secure mounting is required, the hollow core of these resistors permit fastening with
spring-type brackets, thru bolts or thru bolts with slotted-steel brackets.
Suitable for rugged applications, the 270 Type resistors feature all-welded construction and
durable lead free vitreous enamel coating. Mounting brackets not included with resistors.
Made-to-order parts
ordering infO
Non-inductive
F = Fast on Blank = Standard
N = Non-inductive
(optional)
L
Non-inductive
Blank = Standard
N = Non-inductive
RoHS
Compliant
RoHS Compliant
����������������
25J100E
Series
Coating
Blank = Vitreous
C = Centohm
S = Silicone
Core Diameter
See “Core and
Terminal Selection”
Wattage Tolerance Ohms
J = 5%
1R0 = 1 Ω
K = 10% 250 = 250 Ω
1K0 = 1,000 Ω
25K = 25,000 Ω
25K5 = 25,500 Ω
Coating
Wattage
270 = Vitreous
470 = Silicone Ceramic
Terminal Type
See “Resistor Terminals
for Tubular Cores”
Ohms
Tolerance
R500 = 0.500 Ω J = 5%
1R00 = 1 Ω
K = 10%
250R = 250 Ω
See website for
1K00 = 1,000 Ω
25K0 = 25,000 Ω
custom core and
25K5 = 25,500 Ω
terminal info
Power limitations for high resistance values: When resistance
exceeds the resistance values
listed, derate the Power Rating by
25% to improve reliability:
Power Resistance No power
derating
rating
value
necessary
12W
3,900Ω
for ratings
25W
12,000Ω
higher than
50W
35,000Ω
100W.
100W
75,000Ω
34
Ohmite Mfg. Co.
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1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
L1000J–––1000


L500J––– 500










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
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











L225J––– 225




2,500
3,000
3,500
4,000
5,000
6,000
7,500
10,000
12,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
75,000
100,000
150,000
200,000
250,000
L175J––– 175






L100J––– 100






Part No.
Prefix 
Suffix
–––2K5E 
–––3K0E 
–––3K5E 
–––4K0E 
–––5K0E 
–––6K0E 
–––7K5E 
–––10KE 
–––12KE 
–––15KE 
–––20KE 
–––25KE 
–––30KE
–––35KE
–––40KE 
–––50KE 
–––60KE
–––75KE
–––100KE 
–––150KE
–––200KE
–––250KE
L50J––– 50






L25J––– 25
L225J––– 225






Ohmic value
L175J––– 175











L500J––– 500
L100J––– 100
Red outlined values supplied in Silicone-Ceramic coatings
instead of vitreous enamel.
L50J––– 50
 = Standard values; check availability using the worldwide
inventory search at www.ohmite.com
1
2
3
4
5
10
15
25
50
75
100
125
150
200
250
500
750
800
1,000
1,500
2,000
Part No.
Prefix 
Suffix
–––1R0E
–––2R0E
–––3R0E
–––4R0E
–––5R0E
–––10RE
–––15RE
–––25RE
–––50RE
–––75RE
–––100E
–––125E
–––150E
–––200E
–––250E
–––500E
–––750E
–––800E
–––1K0E
–––1K5E
–––2K0E
L25J––– 25
12 Watt
 L12J180E
 L12J270E
 L12J330E
 L12J390E
 L12J470E
 L12J560E
 L12J1K0E
 L12J1K2E
 L12J1K5E
 L12J2K2E
 L12J2K7E
 L12J4K7E
 L12J10KE
 L12J18KE
 L12J22KE
 L12J51KE
Wattage

12 Watt
L12JKR51E
L12J1R0E
L12J3R3E
L12J4R7E
L12J10RE
L12J12RE
L12J15RE
L12J22RE
L12J27RE
L12J33RE
L12J47RE
L12J68RE
L12J82RE
L12J100E
L12J150E
















Ohmic
value
180
270
330
390
470
560
1000
1200
1500
2200
2700
4700
10000
18000
22000
51000
Ohmic value
Wattage
Ohmic
value
0.51
1
3.3
4.7
10
12
15
22
27
33
47
68
82
100
150
L1000J–––1000
S ta n d a r d pa rt n u m b e r s f o r 2 7 0 s e r i e s
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