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3R-250 Datasheet(PDF) 1 Page - Willow Technologies Ltd

Part No. 3R-250
Description  250Watt Mountable Non-Inductive, High Frequency Resistors
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Maker  WILLOW [Willow Technologies Ltd]
Homepage  http://www.willow.co.uk
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3R-250 Datasheet(HTML) 1 Page - Willow Technologies Ltd

   
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3R-250 250WattMountableNon-Inductive,
High Frequency Resistors

·Heat Sink Mountable
with M4 Screw
·RF Terminal
·Shunt
·Inverter
·Moter Braking
·Pulse & Plasma
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.
Motor Controls, High Energy, RF, High Voltage, Inverters, Pulse & Plasma,
Non-Inductive Powers
3R-250 Non-Inductive 250Watt
Mountable, High Frequency Resistors
SPECIFICATIONS
DERATING CURVE
25
50
75
00
25
50
75
00
80
60
40
20
0
Tap Temperature (˚C)
Resistance Values : 1R0 to 2Megohm others on
rquest
Resistance Tolerance : ± 10% Std. ,1%,2%,5%
available on request.
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
Capacity/Resistive : ≤40pF
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
Required flatness of heat sink : ≤ 0.05mm
Roughness of the Heatsink surface : ≤ 6.4㎛.
Isolation Voltage(Terminal to Heatsink) : 7k Vrms
cf.: The described specifications & dimensions subject to change without notice.
DIEMENSION
Willow Technologies Ltd.
Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
+ 44 (0) 1342 835234
+ 44 (0) 1342 834306
info@willow.co.uk
http://www.willow.co.uk


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