3R 250

3R-250
250Watt Mountable Non-Inductive,
High Frequency Resistors
Motor Controls, High Energy, RF, High Voltage, Inverters, Pulse & Plasma,
Non-Inductive Powers
3R-250 Non-Inductive design these elements are ideally suites for high frequency and pulse load applications. By direct
mounting on a heatsink significant cost advantages can be reailzed for power Appliation from 100w to 600w. 3R-250 can
be supplied in a 2-terminal Main applications are Variable speed Drives, ship, train, RF Termination, Power Supplies, Control
Devices, Telecom, Robotics, Motor Controls Dynamic Braking, and other switching designs.
3R-250 Non-Inductive 250Watt
Mountable, High Frequency Resistors
·Heat Sink Mountable
with M4 Screw
·RF Terminal
·Shunt
·Inverter
·Moter Braking
·Pulse & Plasma
SPECIFICATIONS
Resistance Values : 1R0 to 2Megohm others on
rquest
Resistance Tolerance : ± 10% Std. ,1%,2%,5%
available on request.
DIEMENSION
Temperature Coefficient : ± 100ppm/°C typ.
(others upon request)
Maximum Working Voltage : 5,000V DC, higher
voltage on request, not execeeding max. power
Single Shot Voltage : Up to 12kV at std. wave
(1.5/50 ㎲)
Insulation Resistance : 10GΩ min. at 500V
Creeping Distance : 42mm min.
Inductance :≤50 nH
Capacity/Ground : ≤110pF
Operation Temperature : -55°C to +155°C
Max. Torque for Contacts : 2 N.m
Max. Torque for Mounting : 1.8 N.m
Power Rating : 250W at 50°C Tap Temperature
Higher power : 600Watt at 5°C Tap Temperature
Dielectric Strength : Up to 12 kV
Termination to Contacts : M5 Screws
Required thermal transfer compound of-heat
conductivity : 1 W/°C
DERATING CURVE
Rated Power or Voltage%
Capacity/Resistive : ≤40pF
Required flatness of heat sink : ≤ 0.05mm
Roughness of the Heatsink surface : ≤ 6.4㎛.
Isolation Voltage(Terminal to Heatsink) : 7k Vrms
100
80
60
40
20
0
25
50
75100125150175
Tap Temperature (˚C)
cf.: The described specifications & dimensions subject to change without notice.
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected]
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