1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

113

270 Series

Vitreous Enamel Power

Series

Wattage

Ohms

Core Code

Voltage

Std. Terminal

L12

12

0.1-51K

D

565

57

L25

25

0.15-100K

K

625

40

L50

50

0.38-260K

K

1625

40

L100

100

0.23-101K

M

2845

40

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

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

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

high resistance values

When resistance exceeds the resistance values listed, derate the Power Rating by 25% to

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 http://www.ohmite.com/techdata/lug-mounting.php

Select 270 Type fixed resistors for applications

requiring wattage ratings from 12 to 1000 watts.

The 270 Type resistors are equipped with lug termi-

nals 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.

Fea ture S

•Terminalssuitableforsoldering

or bolt connection

•Highwattageapplications

•Ruggedleadfreevitreousenamelcoating

•Flameresistantcoating

•All-weldedconstruction

•RoHScompliantavailable

•“Faston”option–seeterminal538,

http://www.ohmite.com/techdata/terminals.pdf

S er I e S SP e CIFIC at IONS

C hara C ter IS t ICS

(continued)