270 SERIES DATASHEET

Wattage:

12

Ohms:

0.1-51K

Core Code:

D

Max. Voltage*:

565

Std. Terminal:

57

Wattage:

25

Ohms:

0.15-100K

Core Code:

K

Max. Voltage*:

625

Std. Terminal:

40

Wattage:

50

Ohms:

0.38-260K

Core Code:

K

Max. Voltage*:

1625

Std. Terminal:

40

Wattage:

100

Ohms:

0.23-101K

Core Code:

M

Max. Voltage*:

2845

Std. Terminal:

40

Wattage:

175

Ohms:

0.13-101K

Core Code:

P

Max. Voltage*:

3595

Std. Terminal:

46

Wattage:

225

Ohms:

0.16-129K

Core Code:

P

Max. Voltage*:

4595

Std. Terminal:

46

Wattage:

500

Ohms:

0.38-218K

Core Code:

S

Max. Voltage*:

4970

Std. Terminal:

45

Wattage:

1000

Ohms:

0.69-392K

Core Code:

S

Max. Voltage*:

8900

Std. Terminal:

45

Lead free vitreous enamel. Large models (500 watts and up) are supplied in Silicone Ceramic. Also available in low-cost Centohm coating; Consult factory.

Tubular ceramic.

Solder coated radial lug. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu

Linearly from 100% @ +25°C to 0% @ +350°C.

±5% 1Ω and over (J); ±10% under 1Ω (K)

Based on 25°C free air rating.

10 times rated wattage for 5 seconds.

1 to 20Ω: ±400 ppm/°C; Above 20Ω: ±260 ppm/°C

1000 VAC: 12 to 100 watt rating. 3000 VAC: 175 to 225 watt rating (Measured from terminal to mounting bracket)

Use the formula √P/R

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.

12W 3,900Ω, 25W 12,000Ω, 50W 35,000Ω, 100W 75,000Ω

See [Mounting Hardware](https://www.ohmite.com/assets/docs/hardware_resistor.pdf)