270 Series
Vitreous Enamel Power
F E AT U R E S
Select 270 Type fixed resistors for applications
requiring wattage ratings from 12 to 1000 watts. • Terminals suitable for solder-
The 270 Type resistors are equipped with lug termi- ing or bolt connection
nals suitable for soldering or sturdy bolt connection. • High wattage applications
When secure mounting is required, the hollow core
• Rugged lead free vitreous enamel coating
of these resistors permit fastening with spring-type
brackets, thru bolts or thru bolts with slotted-steel • Flame resistant coating
brackets. • All-welded construction
Suitable for rugged applications, the 270 Type • RoHS compliant available
resistors feature all-welded construction and durable
lead free vitreous enamel coating. Mounting brack- • “Fast on” option – see terminal 538,
ets not included with resistors. https://www.ohmite.com/assets/docs/terminals.pdf
S E R I E S S P E C I F I C AT I O N S
Non-Inductive versions available;
Series Wattage Ohms Core Code Max. Voltage* Std. Terminal Other sizes available; Also available in
low cost Centohm or Silicone coating;
L12 12 0.1-51K D 565 57 Consult Ohmite.
L25 25 0.15-100K K 625 40 * Maximum Voltage is based on
Ohm’s Law [V=√P*R] as limited by the
L50 50 0.38-260K K 1625 40 resistance value of specified product
or the voltage limit stated, whichever
L100 100 0.23-101K M 2845 40 is lower.
L175 175 0.13-101K P 3595 46
L225 225 0.16-129K P 4595 46
L500 500 0.38-218K S 4970 45
L1000 1000 0.69-392K S 8900 45
CHARACTERISTICS
Coating Lead free vitreous enamel. Large models (500 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.
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)
Max. amps use the formula √P/R
Power limitations for When resistance exceeds the resistance values listed, derate the Power Rating by 25% to
high resistance values improve reliability. No power derating necessary for ratings higher than 100W.
Power Resistance
rating value
12W 3,900Ω
25W 12,000Ω
50W 35,000Ω
100W 75,000Ω
Mounting Hardware see https://www.ohmite.com/assets/docs/hardware_resistor.pdf
(continued)
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270 Series
Vitreous Enamel Power
DIMENSIONS
in./mm
Series Wattage L D C Core Code* Std. Term.**
L12 12 1.75 / 44.4 0.313 / 7.94 0.188 / 4.76 D 57
L25 25 2.0 / 50.8 0.562 / 14.3 0.313 / 7.94 K 40
L50 50 4.0 / 101.6 0.562 / 14.3 0.313 / 7.94 K 40
D C L100 100 6.5 / 165.1 0.750 / 19.1 0.50 / 12.7 M 40
L175 175 8.5 / 215.9 1.125 / 28.6 0.75 / 19.1 P 46
L L225 225 10.5 / 266.7 1.125 / 28.6 0.75 / 19.1 P 46
L500 500 12.0 / 304.8 2.50 / 63.5 1.75 / 44.5 S 45
L1000 1000 20.0 / 508.0 2.50 / 63.5 1.75 / 44.5 S 45
* https://www.ohmite.com/assets/docs/200-210-270-custom.pdf
** https://www.ohmite.com/assets/docs/terminals.pdf
O R D E R I N G I N F O R M AT I O N
Standard Made-to-order
Non-inductive Non-inductive Core Diameter
F = Fast on Blank = Standard RoHS Blank = Standard See “Core and
(optional) N = Non-inductive Compliant N = Non-inductive Terminal Selection” RoHS Compliant
L 25J100E
Coating Wattage Ohms Tolerance
Series Wattage Tolerance Ohms 270 = Vitreous R500 = 0.500Ω J = 5%
Coating J = 5% 1R0 = 1Ω 470 = Silicone Ceramic 1R00 = 1Ω K = 10%
K = 10% 250 = 250Ω Terminal Type
Blank = Vitreous 250R = 250Ω
1K0 = 1,000Ω See “Resistor Terminals
C = Centohm 1K00 = 1,000Ω
for Tubular Cores”
S = Silicone 25K = 25,000Ω 25K0 = 25,000Ω
25K5 = 25,500Ω 25K5 = 25,500Ω
See website for custom core and terminal info:
http://www.ohmite.com/assets/docs/terminals.pdf
Standard part numbers for 270 series
Wattage Wattage
L1000J–––1000
L1000J–––1000
Ohmic Ohmic
L225J––– 225
L500J––– 500
L100J––– 100
L225J––– 225
L175J––– 175
L500J––– 500
L100J––– 100
L175J––– 175
12 Watt 12 Watt
L50J––– 50
L25J––– 25
L25J––– 25
L50J––– 50
value value
Ohmic value
Ohmic value
0.51 L12JKR51E 180 L12J180E Part No. Part No.
1 L12J1R0E 270 L12J270E Prefix Prefix
Suffix Suffix
3.3 L12J3R3E 330 L12J330E
4.7 L12J4R7E 390 L12J390E 1 –––1R0E 2,500 –––2K5E
10 L12J10RE 470 L12J470E 2 –––2R0E 3,000 –––3K0E
12 L12J12RE 560 L12J560E 3 –––3R0E 3,500 –––3K5E
15 L12J15RE 1000 L12J1K0E 4 –––4R0E 4,000 –––4K0E
22 L12J22RE 1200 L12J1K2E 5 –––5R0E 5,000 –––5K0E
27 L12J27RE 1500 L12J1K5E 10 –––10RE 6,000 –––6K0E
33 L12J33RE 2200 L12J2K2E 15 –––15RE 7,500 –––7K5E
47 L12J47RE 2700 L12J2K7E 25 –––25RE 10,000 –––10KE
68 L12J68RE 4700 L12J4K7E 50 –––50RE 12,000 –––12KE
82 L12J82RE 10000 L12J10KE 75 –––75RE 15,000 –––15KE
100 L12J100E 18000 L12J18KE 100 –––100E 20,000 –––20KE
150 L12J150E 22000 L12J22KE 125 –––125E 25,000 –––25KE
51000 L12J51KE 150 –––150E 30,000 –––30KE
200 –––200E 35,000 –––35KE
= Standard values; check availability using the worldwide 250 –––250E 40,000 –––40KE
inventory search at www.ohmite.com 50,000 –––50KE
500 –––500E
Red outlined values supplied in Silicone-Ceramic coatings 750 –––750E 60,000 –––60KE
instead of vitreous enamel. 800 –––800E 75,000 –––75KE
1,000 –––1K0E 100,000 –––100KE
1,500 –––1K5E 150,000 –––150KE
2,000 –––2K0E 200,000 –––200KE
250,000 –––250KE
rev 4/22-1
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Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Ohmite:
L12J51K L12J18K L175J40K L100J4R0 L12J8K2 L175J2K5 L175J75K L225J75K L12J56R L12J12R L12J15R
L12J39R L12J18R L12J68R L12J10R L12J180 L12J120 L12J390 L12J820 L175J60K L225J60K L225J30K
L50J3K0 L175J15K L175J25K L100J60K L12J39K L12J33K L50J8K0 L12J560 L12J22K L50J800 L12J12K
L12J15K L12J1K5 L12J1K8 L12J680 L12J2R2 L12J270 L12J220 L1000J30K L12J47K L25J70K L100J15K
L1000J10K L175J100K L50J12K L12J3K3 L12J3K9 L25J80K LN175J500 LN175J100 L100J200 LN100J15R
L1000J100K L-10000-F2-T2 L500J85R L25KR50 L50J625 L225J1K2 270-25K58-15K0J L1000J6K0 LN25J25R
L500J100E L25F1R0-B LN50J2R0E 47025K40-25R00J LN50J25RE L1000J250KE L225J20RE L8KR25
L50J840E LN175J15RE L500J50R L130F125 L225J6K0 LN225J300E LN100J50R-B LN500J15RE L1000J3K0E
L175J20R L225J12KE LN100J100E 2701000S44-200E 270275R44-60RE LN225J15RE 270120N14140R0KE
47025K40-30KJCT L100J40K LN225J250E L12NJ20R CL225J350K L50J400E L50J300E L25J27K 270500S44-
400R L25J22KE L65J1K0 LN50J500 L175J200E
