RARA Electronics Corporation - EW Specifications

EW EDGE WOUND
RESISTOR ASSEMBLIES

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The EW series of metal clad, edge wound resistors are designed for use in extremely high power inverters. The
basis for these models are edge wound elements. These are covered by a case which conforms to international
safety specifications. This case is powder coated and baked for durability.

GENERAL SPECIFICATIONS

Model

Resistance
Range [ohms]

Power Rating

Resistance
Tolerance

Fan

Free Air

EWS10K 0.5-3.0
6KW

3KW

+-0.5(D)
+-10(K)

EWS13K 1.0-4.0
8KW

4KW

EWS20K 1.0-6.0
12KW

6KW

EWS26K 1.5-8.0 15KW 7.5KW

EWF10K 3.1-18 6KW 3KW

EWF13K 4.5-24 8KW 4KW

EWF20K 6.1-36 12KW 6KW

EWF26K 9.0-48 15KW 7.5KW

CHARACTERISTICS

1/Temperature Range

                                                                                                                                           -55C to +200C

2/Insulation Resistance

                                                                                                                                 20Mohms minimum

3/Dielectric Strength

                      Available options: 1500, 3500, 4500, 5400 (VAC); Max Leakage Current: 2mA

4/Temp. Coefficient

                                                       EWS: +-800ppm/C maximum; EWF: +-260ppm/C maximum

5/Short Time Overload

+-[2%+0.05 ohms]                                                                                     10 X wattage rating 5s.

6/Moisture Resistance

+-[3%+0.05 ohms]                                      40C, 95% RH, DC100V case to terminal (500hrs.)

7/Thermal Shock

+-[2%+0.05 ohms]                                                      Wattage rating 30min., -25C, 15minutes

DIMENSIONS

Model

Dimensions[mm]

Weight [Kg]

D+-5 W+-4 H+-4

EWS10K 700 350 190 17.0/17.5(fan)

EWS13K 445 190 23

EWS20K 350 280 26.5/27.0(fan)

EWS26K 445 280 35.5

EWF10K 350 190 15.0/15.5(fan)

EWF13K 445 190 20

EWF20K 350 280 22.5/23.0(fan)

EWF26K 445 280 30

ORDERING PROCEDURE EXAMPLE

Model	Resistance Range [ohms]	Power Rating		Resistance Tolerance
Model	Resistance Range [ohms]	Fan	Free Air	Resistance Tolerance
EWS10K	0.5-3.0	6KW	3KW	+-0.5(D) +-10(K)
EWS13K	1.0-4.0	8KW	4KW
EWS20K	1.0-6.0	12KW	6KW
EWS26K	1.5-8.0	15KW	7.5KW
EWF10K	3.1-18	6KW	3KW
EWF13K	4.5-24	8KW	4KW
EWF20K	6.1-36	12KW	6KW
EWF26K	9.0-48	15KW	7.5KW

1/Temperature Range	-55C to +200C
2/Insulation Resistance	20Mohms minimum
3/Dielectric Strength	Available options: 1500, 3500, 4500, 5400 (VAC); Max Leakage Current: 2mA
4/Temp. Coefficient	EWS: +-800ppm/C maximum; EWF: +-260ppm/C maximum
5/Short Time Overload	+-[2%+0.05 ohms] 10 X wattage rating 5s.
6/Moisture Resistance	+-[3%+0.05 ohms] 40C, 95% RH, DC100V case to terminal (500hrs.)
7/Thermal Shock	+-[2%+0.05 ohms] Wattage rating 30min., -25C, 15minutes

Model	Dimensions[mm]			Weight [Kg]
Model	D+-5	W+-4	H+-4	Weight [Kg]
EWS10K	700	350	190	17.0/17.5(fan)
EWS13K		445	190	23
EWS20K		350	280	26.5/27.0(fan)
EWS26K		445	280	35.5
EWF10K		350	190	15.0/15.5(fan)
EWF13K		445	190	20
EWF20K		350	280	22.5/23.0(fan)
EWF26K		445	280	30