Wirewound Aluminum Housed Power Resistors

Power Resistors Index
AH Series - Power Wirewound Housed Aluminum Resistors
FVR Series - Power Variable Resistors
BOX Series - Assembly Load Voltage Resistors
DST Series - Power Wirewound Starter Resistors
DR Series - Nonflammable Power Fixed Resistors
BSR, BSQ Series - Power Variable Slide Resistors
ZZR, ZQR Series - Nonflammable Flat Power Resistor
AL Series - Power Metal Clad Large Capacity Resistors
DOE Series - Power Oval Edge-wound High Current Resistors
RNW Series - Chambers Resistors, Power Braking, Load Banks
DQ Series - Nonflammable Wave Shape Ribbon Power Resistors
Power Resistance Devices Mounting Methods

Direct's new flat core winding technology allows for wirewound heatsinkable resistor affording a very low profile, and superior thermal transfer characteristics when compared to conventional aluminum housed wirewound resistor.
Close mounting of heat sensitive components is possible due to only a slight rise of the temperature on the aluminum profile. No heat sink compound is required because of large mounting surface.

Feature:
High power rating , small size and ultra precision.
Standard winding & non-inductive winding types.
High stability , strong construction.
General Specification:
Wattage Range: 6 styles to choose ranging from 5 to 250 watts.
Resistance Tolerance: 10%, 5%, 3%, 2%, 1%, 0.5%
Operating Temperature Range : -55% to +275°C
Dielectric Strength: AH-5 AH-10 AH-25 1000V AH-50 1500V

Standard Electrical Specification

Type	MIL	25°C Rated Power (W)		Resistance Range (Ω)
Type	Type	Industry	Military	± 0.05%, ±0.1%	±0.25%	±0.5%	±1%,±5%,±10%
AH-5	RE60G	5	5	1.0~510Ω	0.5~1.5K	0.1~1.2K	0.10~3.32K
AH-5N	RE60N	5	5	1.0~100Ω	1.0~200Ω	1.0~860Ω	1.0~1.65K
AH-10	RE65G	10	10	1.0~1.2K	0.5-2.7K	0.1~2.7K	0.10~5.62K
AH-10N	RE65N	10	10	1.0~860Ω	1.0~1.2K	1.0~1.2K	1.0~2.8K
AH-25	RE70G	25	20	0.5~2.7K	0.1~3.9K	0.1~3.9K	0.10~12.1K
AH-25N	RE70N	25	20	1.0~1.2K	1.0~2.7K	1.0~2.7K	1.0~6.04K
AH-50	RE75G	50	30	0.5~3.9K	0.1~5.6K	0.1~5.6K	0.10~39.2K
AH-50N	RE75N	50	30	1.0~2.7K	1.0~3.9K	1.0~3.9K	1.0~19.6K
AH-100	RE77G	100	75	1.0~5.6K	0.1~8.2K	0.05~12K	0.05~29.4K
AH-100N	RE77N	100	75	1.0~3.9K	1.0~5.6K	1.0~5.6K	1.0~14.7K
AH-250	RE80G	250	120	0.1~12K	0.1~27K	0.1~27K	0.1~35.7K
AH-250N	RE80N	250	120	1.0~5.6K	1.0~8.2K	1.0~8.2K	1.0~17.4K

Notice: All dimensions might be changed or modified, please refer to last updating specification.

Performance

Parameters	Test Conditions	Specifications
Short Time Over Load	5 × wattage rating-5sec.	Δ R±(0.5%+0.05Ω)Max.
Moistrue Resistance	temp 40°C moisture 95% DC 100V 500Hr	Δ R±(0.5%+0.05Ω)Max.
Moisture Load Life	temp 40°C moisture 95% 1/10 × wattage rating (1.5Hr on-0.5Hr OFF)- Repeat 1000Hr	Δ R±(0.5%+0.05Ω)Max.
Load Life	Load Rating (chassis mounted) (1.5Hour on 0.5Hour OFF) Repeat 1000Hours	Δ R±(1.5%+0.05Ω)Max.
Vibration	10c/s~50c/s~10c/s(1Min)-2Hours each of paralleled and right angle	Δ R±(0.2%+0.05Ω)Max.
Heat Resistance	275°C 2Hours	Δ R±(0.5%+0.05Ω)Max.
Dielectric Strength	AH-5 AH-10 AH-25 1000V AH-50 1500V AH-100 AH-250 2500V	Δ R±(0.5%+0.05Ω)Max.
Insulation Resistance	Under the same test condition of Dielectric Strength, Load DC500V and measure the Insulation R.	1000MΩMin.
Terminal Strength	(1)Pull Test (30 sec Min) AH-5 1kg, AH-10 2.3kg, AH-25, AH-50 4.5kg (2)Torque Test(5~15sec) AH-100 27kg-cm, AH-250 36kg-cm	Δ R±(0.2%+0.05Ω)Max.

Surface Temperature Versus Power Load (on Chassis)

Deratning

Power Oval Edge-wound High Current Resistors

Wirewound Aluminum Housed Power Resistors

Derating is required to reduce chassis ounting area and for high ambient temperatures.
Curves: A=5 & 10 watt unites, unmounted.B=25 watt units, unmounted.C=50,100 & 250 watt units, unmounted.

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POWER RESISTORS