PR254 Series 

THICK FILM POWER RESISTORS PR254

Features 

Very good ratio Power / Volume
Easy mounting and wiring with significant cost advantages.
Non inductive performance for high frequency applications.
One models for power applications up to 500W.
Suited to ULV94-V0 application.

Electrical Specifications

- Power rating:

250W (heatsink at 100°C)

- Resistance range:

From 1R0 to 1MOhm, E12 series

- Tolerance

Standard 10%, up to 1% on request

- Temperature coefficient

±100 ppm/°C

- Max Work. Voltage

5000 Vac  

-Work Temp. Range

From -55°C to +155°C

- Dielectric Strength

7000 Vac (12000 Vac x PR254T)

- Insulation resistance

> 10⁵ MOhm a 500V

- Creep distance

42 mm (65 mm x PR254T)

- Air gap distance

16 mm (29mm x PR254T)

- Partial discharge

< 10 pC @ 5000 Vac  

- Self inductance:

80 nH

- Capacità parallela

40 pF

- Parallel capacitance

< 120 pF

- Overload

4 Pn x 10 s

- Thermal resistance:

0.15 °C/W

- Heatsink flatness:  

0.05 mm Max

- Heatsink surface finish

6.3μm Max 

- Thermal grease

Required

- Max torque for contacts

2 Nm (static)

- Max torque for mounting:

2 Nm (static)

- Weight:

125 g (155 g x PR254T)

- Options

Cable terminals PR254C / PR254TC