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WIRE WOUND RESISTORS Power ratings range from 20 to 500 watts for a single tube. Resistance values are offered from less than 1 ohm to about 100 kilo ohms. Resistors used in the following applications: Resistive load banks (dummy load) for testing apparatus and battery discharging. Mains suppressor circuits. Voltage dropping circuits. Current limiting circuits. Dynamic braking of DC motor variable speed drives (VSD). Three types of metal alloys are preferred for our resistor windings namely; Coppernickel (CuNi); nickel-chrome (NiCr); chrome-aluminium (CrAl). General resistor specifications: Temperature factor of resistance for CuNi: 1%@250°C Temperature factor of resistance for NiCr: 1%@250°C Temperature factor of resistance for CrAl: 3%@250°C CrAl is resistant to sulphurous atmospheric environments. NiCr is non-magnetic so does not attract magnetic dust particles. NiCr is also more corrosion resistant at room temperature. Maximum design temperature <350°C Dynamic braking resistors momentary temperature: <450°C Application voltage: 1kV Maximum design voltage; 3kV Terminals and mounting feet: 304 stainless steel. Resistor core material: Cordierite based. Resistor insulator material: Siliceous porcelain. SINGLE TUBE RESISTORS RANGE BETWEEN 20-500 WATTS. Often power ratings of more than 500 watts are required but then we use several 500 watt “open winding” wire wound resistors connected in either series or parallel and can offer an enclosure with connection terminals. Si-Cer RESISTOR COATING Our world-class green resistor coating is a silicon-based, heat resistant formula using state-of-the-art VOC compliant water dispersible silicon resin. It is used where resistors are subjected to harsh environmental conditions: Temperature of 600°C Salt spray Moisture Chemical corrosion Thermal cycling UV light RESISTOR DIMENSIONS FOR SMOOTH AND MEALIE COB TYPE RESISTORS SMOOTH TUBE RESISTORS Smooth tube type Power rating: A- TUBE LENGTH (mm) B- TOTAL HEIGHT C- TERMINAL WIDTH D- TUBE Ø OD d- TUBE Ø ID E- MOUNTING HOLES CENTRE-TO-CENTRE F- CONNECTION BOLT Ø H- TOTAL LENGTH 20W 25W 30W 40W 50W 75W 55 60 6.8 16 9 3 85 63 60 6.8 16 9 3 93 80 60 6.8 16 9 3 120 120 60 6.8 16 9 3 150 100W 150W 200W 250W 250W 300W 400W 450W 100 80 8 31 19 134 80 8 31 19 150 80 8 31 19 200 80 8 31 19 247 80 8 31 19 320 80 8 31 19 200 100 10 45 20 250 100 10 45 20 300 100 10 45 20 350 100 10 45 20 145 179 195 245 292 365 245 295 345 395 4 165 4 199 4 215 4 255 4 302 4 375 6 265 6 315 6 365 6 415 MEALIE COB RESISTORS Mealie cob type Power rating: A- TUBE LENGTH B- TOTAL HEIGHT C- TERMINAL WIDTH D- TUBE Ø OD d- TUBE Ø ID F- CONNECTION BOLT Ø 100W 200W 300W 400W 600W 100 85 21 45 10 6 155 85 21 45 10 6 205 85 21 45 10 6 255 110 21 45 10 6 305 110 21 45 10 6 ENCLOSED RESISTORS Resistors for load testing purposes can be supplied in enclosures if requested. Read more on our LOAD BANKS page. LOCOMOTIVE RESISTORS Transnet Engineering regularly requires replacement variable wire wound resistors for class 10M5 locomotives. These resistors are referred to as a motor coach headlight and voltage regulator resistor and described as the following: U1639 U1634 7E47 7E44 31x247mm variable. 31x134mm variable. 31x247mm fixed. 31x134mm fixed. Capacitor discharge resistors: After power is removed the charge on the capacitor will drain off through this "bleeder resistor", causing the voltage to decay quickly to safe levels. While the power supply is on, a small current flows through the bleeder resistor, wasting a small amount of power. RESISTOR REPLACEMENTS FOR ELECTRIC LOCOMOTIVES We are also able to manufacture replacements for obsolete resistors such as these electric locomotive resistor panels: Resistor panel for indicating lamps: Old panel: New Panel: Resistor panel for braking control: Old panel: Excitation resistor panels New panel: Resistor panel for sealed beam headlight lamps: Old panel: New panel: PLATE RESISTORS We also offer single flat plate wire wound resistors capable of dissipating 3,000 watts (3kW). As with all of our resistors, several may be connected in a series/parallel manner to obtain higher power ratings. Their flat shape promotes better cooling. SIZE: 540x100mm POWER: 1,000 WATTS (1kW) SIZE: 700x150mm POWER: 3,000 WATTS (3kW)