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]