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 |