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MODEL RB FIXED POWER WIREWOUND RESISTORS ALUMINUM HOUSED

FEATURES

  • Extruded aluminum housing provides superior heat conduction
  • Housing deep fined for maximum heat dissapation at natural or forced air convection
  • Gold anodized finish for maximum resistance to enviromental conditions
  • Special thermosetting compound with high thermal conductivity
  • Winding designed to give maximum core coverage and uniformity for even heat dissapation
  • Core centerless ground for maximum winding uniformity
  • Marking at top surface for easy identification after mounting
  • Complete welded construction thermal to thermal

SPECIFICATIONS

  • These resistors meet or exceed the requirements of MIL-R-18546 E specification.

ELECTRICAL

For Power ratings and Resistance values: see table.

Tolerance
The following tolerances are available: 1%, 3%, 5%
Temperature Coefficient
30 ppm R > 20 Ohm
50 ppm I Ohm < R < 20 Ohm
100 ppm 0.1 Ohm < R < I Ohm
Dielectric Strength
1,000 Vac for RB5 / RB10
2,000 Vac for RB25 / RB50
3,500 Vac for RB75 / RB101 / RB150
4,500 Vac for RB100 / RB250
Insulation Resistance
10,000 MOhms minimum
1,000 MOhms after moisture test
Overload
5 sec. At 5 times rated power.
Non Inductive
Models of equivalent physical and electrical specification are available with non inductive Ayrton-Perry winding

MECHANICAL

Terminal strength
10 lb. pull test.
Solderability
Satisfactory when tested in accordance with method 208 of MIL-STD-202. The use of high temperature solder is recommended when resistors are operated near the maximum specified ratings.

MATERIAL

Core
Ceramic steatite or alumina centerless ground.
Resistive element
Copper-nickel alloy or nickel-chrome alloy of determined temperature coefficient.
End caps
Stainless steel.
Encapsulant
High temperature thermosetting compound
Housing
Aluminum with hard anodic coating
Standard terminals
Copperweld RB5 to RB150.
Stainless steel for RB100 and RB250.

DERATING

ATE RB resistors have an operative temperature range of -55°C to +250°C. Derating is required for reduced chassis area and for high ambient temperature.

Type Type Mil-R-18546E Nominal Power(W) Max Power No Heatsink(W) Res. Range (Ohm) V Linit(V) Temp. Rise With Heatsink
(°C/W)
Weight(Gr) Heatsink dim.(cm2xmm)
RB10 RE65 12 6 0.01/10K 265 5.1 6 415x1
RB25 RE70 25 12.5 0.01/18K 550 3 14 535x1
RB50 RE75 50 20 0.01/68K 1250 1.9 35 930x1.5
RB75   75 35 0.1/50K 1400 1.1 85 995x3
RB101   100 40 0.1/70K 1900 1 115 995x3
RB150   150 55 0.1/100K 2500 1 165 995x3
RB100 RE77 150 75 0.1/100K 1900 0.84 500 930x3
RB250 RE80 250 100 0.1/120K 2300 0.66 900 930x3

Type Dimensions(mm)
  A B C D E F G H J K L M N O
RB10 20.4 35 10 11 19 14.3 15.9 5 2.4 2 2.4   2 2.2
RB25 27.2 49 14 14 27 18.3 19.8 6.5 4.4 2 3.2   2 2.2
RB50 29.2 71 16 16 50 39.7 21.5 7 5.2 2 3.2   2 2.2
RB75 47.5 73 24 27 48 29 37 11.5 9.5 3.5 4.4   3 3.2
RB101 47.5 73 24 27 64 35 37 11.5 14.5 3.5 4.4   3 3.2
RB150 47.5 122 24 27 97 58 37 11.5 19.5 3.5 4.4   3 3.2
RB100 71.5 139 44.5 46 89   57.1 20 9.6 5 4.8 69.8 M5  
RB250 76 178 55.5 54 114 98.4 63.5 25.5 7.8 6.3 4.8 98.4 M5  
Tol. ±0.2 ±1 ±0.2 ±0.5 ±0.2 ±0.2 ±0.2 ±0.5 ±0.2 ±0.2 ±0.2 ±0.2 ±0.2 ±0.2