"SURE" BRAND WIRE WOUND RESISTOR - SAA
ALUMINUM HOUSED AXIAL LUG LEAD - Professional Grade
Features:
High Power to size ratio
Low surface temperature
Elegant look over whole range.
Exceptional stability and reliability against severity of damp heat conditions and other environmental abuses.
Low temperature coefficient over entire range
Anodized aluminum housing ensures good humidity seal
Designed with serrations on Aluminum housing for proper thermal conductivity
Terminations are silver plated
High level voltage protection
Non-standard ohmic values available.
Non inductive and special terminations available
General Specifications:
Test
Conditions
Tolerances
± 1%, ± 2%, ± 5%.
Power Ratings
5 watts to 500watt Resistance Series
E24 Series
Resistance Range
0.05 W - 100 KW
Resistant Element
Copper-nickel alloy, or nickel chrome alloy
Housing
Anodized Aluminum
Core Material
Ceramic steatite
Temperature Range
-55C to 250C
Insulation Resistance
Min. 10 G ohms
Dielectric Strength
AC; Max. leakage current : 2mA
1000VAC peak (10-15W);
2500VAC (25-50W);
5000VAC (100-500W)
Short Time Overload
2 X wattage rating - 5sec
Load Life
Wattage rating 1.5h. ON, 30min. OFF, 1000 hours
Thermal Shock
wattage rating 30min., -55 C, 15-30minutes
Mechanical Data:
POWER (Watt)
A
B
C
D
E
F
G
H
L
10
14.3
15.9
19
35
11
21
10
2
2.4
25
18.3
19.8
27
50
14
27.5
14
2.25
3.18
50
39.8
21.4
50
72
16
29
15.5
2.25
3.18
75
29
37
49
71
27
48
26
3.5
4.4
100
35
37
65.5
83
27
48
26
3.5
4.4
150
70
57
89
139
46
72
45
5
5
250
98.5
63.5
115
178
54
76
56
6.5
5
500
180
63.5
200
263
54
76
56
6.5
5
Dimensions unless specified in mm
Standard terminations:
- 10-100 watt soldered terminations
- 150-500 watt threaded terminations
Construction
SAA: These resistors consist of a resistance element wounded on the special grade ceramic rod and embedded into an aluminum case. The wire used is of low temperature co-efficient. The wire ends are spot welded to the end caps. This gives reliable contacts over long period of use. The aluminum casing made from high quality heat sink grade helps to dissipate the heat from the resistor at the faster rate and has a low change of resistance with respect to temperature, with resistance varying in direct proportion. This type of wire wound resistor is manufactured such that the aluminum enclosure is filled with special non-flammable silicon base cement paste.
Electrical Characteristics
DERATING
The power that the resistor can dissipate depends on the operating temperature
- SAA resistors have an operating temperature range of: -55C to 250C.
- Derating is required for reduced chassis mounting area and for high ambient temperatures.
- The following curves apply to operation of un mounted resistor
- Heat sink size: 178X127X51X1t mm
Test and Requirements
TEST ITEM
CHARACTERISTICS
Resistance tolerance
Tolerance resistance ±10%(K)
Temperature coefficient
±200PPM/°C MAX
Power rating load
D R/R ≤ ±(0.5% + 0.1W)
Surface temperature up 350°CMAX
Short-term overload
Free of appearance or structural irregularity
D R/R ≤ ±(2% + 0.1W)
Insulation resistance
100MW min
Dielectric withstanding voltage
Free of appearance or structural irregularity
D R/R ≤ ±(0.1% + 0.05W)
Terminal strength
Free of appearance or structural irregularity
Resistor strength
Free of appearance or structural irregularity
Vibration
Free of appearance or structural irregularity
Δ R/R ≤ ± (1% + 0.05Ω)
Thermal shock
Resistor free of structural irregularity
Crack of silicon cement surface
Δ R/R ≤ ± (2% + 0.1Ω)
Humidity
Free of appearance or structural irregularity
Δ R/R ≤ ± (3% + 0.1Ω)
Load life
Free of appearance or structural irregularity
Discoloration of marking
Δ R/R ≤ ± (3% + 0.1Ω)
Flame retardation
US UL-94 flame retardation test V-0 grade
noncombustible
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