RARA ELECTRONICS COMPANY-IRV/IRH Specifications

ECONOMICAL
WIRE WOUND, METAL CLAD RESISTORS

Download
PDF File

The IRS30, IRS50 are slim and flat economical resistors. These models are ideal for applications where space
and funds are at a premium. The most common applications for these models are motor drives, braking
and snubber applications and power sources for industrial equipment.

SPECIFICATIONS

MODEL

Wattage Rating
On Heat Sink [W]

Resistance
Range [ohms]

Dimensions

Weight
[g]

L1+-1

L2+-1

IRS 30

30

1 - 420

65

57

65

IRS 50

50

1-500

90

78

50

Available Tolerances: +-0.5(D), +-1.0(F), +-2.0(G), +-10(K)

DIMENSIONS

CHARACTERISTICS

Temperature Range

                                                                                                                                                      -55-200C

Insulation Resistance

                                                                                                                                  20Mohm Minimum

Dielectric Strength

                                              Available Options: AC1500V, 2500V; Max. Leakage Current: 2mA

Temp. Coefficient

                                                                                                                           +-260ppm/C Maximum

Short Time Overload

+-[2%+0.05ohms]                                                                                      5 X Power Rating, 5sec.

Thermal Shock

+-[2%+0.05ohms]                                                                    Power Rating 30min., -25C 15min.

Load Life

+-[5%+0.05ohms]                                                  Power Rating 1.5hrs. on, 30min. off, 500hrs.

SURFACE TEMPERATURE INCREASE VS POWER LOAD

DERATING CURVE

1/ On chassis, 30W, 50W (heatsink size 200X200X3mm)
2/ Free Air, 30W
3/ Free Air, 50W

ORDERING PROCEDURE EXAMPLE

MODEL	Wattage Rating On Heat Sink [W]	Resistance Range [ohms]	Dimensions		Weight [g]
MODEL	Wattage Rating On Heat Sink [W]	Resistance Range [ohms]	L1+-1	L2+-1	Weight [g]
IRS 30	30	1 - 420	65	57	65
IRS 50	50	1-500	90	78	50

Temperature Range	-55-200C
Insulation Resistance	20Mohm Minimum
Dielectric Strength	Available Options: AC1500V, 2500V; Max. Leakage Current: 2mA
Temp. Coefficient	+-260ppm/C Maximum
Short Time Overload	+-[2%+0.05ohms] 5 X Power Rating, 5sec.
Thermal Shock	+-[2%+0.05ohms] Power Rating 30min., -25C 15min.
Load Life	+-[5%+0.05ohms] Power Rating 1.5hrs. on, 30min. off, 500hrs.