C&H Technology RPS250 - Manual (Page 2)

RPS 250
Vishay Sfernice
Document Number: 50007 For technical questions, contact: [email protected] www.vishay.com
Revision: 24-Nov-08 31
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• High power rating: 250 W
• High overload capability up to 4 times nominal
power (see energy curve)
• Easy mounting
• Low thermal radiation of the case
Developed for specific applications such as railroad electrical traction, this series can bear short overloads as high as fifteen times
the nominal power. Designed to be mounted onto a heatsink, these power resistors exhibit remarkable characteristics.
DIMENSIONS in millimeters
MECHANICAL SPECIFICATIONS
Mechanical Protection Insulated case
Substrate Alumina onto
aluminum base
Resistive Element Cermet
End Connections Screws M4, (M5 on
request)
Tightening Torque on connections 2 Nm
Weight
170 g ± 10 %
ENVIRONMENTAL SPECIFICATIONS
Thermal Resistance R TH (j-c) 0.22 °C/W
Temperature Range - 55 °C + 125 °C
Climatic Category 55/125/56
• Tolerance unless stated: ± 0.2 mm
73
56
7 .
5
57
34
Ш 7.2
Ш 4.2
8 .
5
3
2 M4 USEFUL DEPTH: 8
RPS 250D
5 .
0
1
0
6
1
2
Ø
26 ± 1
16.5
ELECTRICAL SPECIFICATIONS
Resistance Range 0.24 Ω to 1M E24 series
Tolerances ± 1 % to ± 10 %
Power Rating chassis mounted
250 W
1000 W at 50 °C continuous
at 25 °C for 10 s
Temperature Coefficient
Standard
± 250 ppm/°C < 1
± 150 ppm/°C > 1
Limiting Element Voltage U
L
5 kVRMS
Dielectric Strength
MIL STD 202 (301), 1 min, 10 mA max. L connections 7 kVRMS
H connections 12 kVRMS
Insulation Resistance > 10 6 M Ω
Inductance < 50 nH
Capacitance Resistor/
ground < 40 pF
< 120 pF