RARA ELECTRONICS COMPANY-IRV/IRH Specifications

IRM/ULM 1600-2800 HIGH POWER,
WIRE WOUND, METAL CLAD RESISTORS

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The IRM (M=Metal cover) models are metal-clad wire-wound high-power resistors designed for industrial and other
applications. The ULM1600-2800 are the UL approved version of the IRV1600-2800 models. Our extruded aluminium
housing provides rugged and strong protection. These models are available with Tab terminals. The most common
applications for these models are motor drives, braking and snubber applications and power sources for industrial
equipment.

SPECIFICATIONS

Model

Rated Power

Resistance Range

Resistance
Tolerance

Free Air

Inductive

Non-Inductive

IRM/ULM1600

570W
1.5-88
0.3-23

F[+-01%]
J[+-05%]
K[+-10%]

IRM/ULM2000
650W 2.0-113
0.45-30.5

IRM/ULM2400

720W
2.5-144
0.6-37

IRM/ULM2800
750W 3.0-135
0.7-33.5

CHARACTERISTICS                                                  Values in [ ] mean change in ohmic value after test

Temperature Range

-55C to +200C

Insulation Resistance

20MW minimum

Dielectric Strength

AC1500V, 2500V, 3500V, 4500V for 1 min.; Max. leakage current: 2mA

Temp. Coefficient

                                                                                                     ±260ppm/C maximum

Short Time Overload

±[3%+0.05W]                                                                10 X Power rating-5seconds

Moisture Resistance

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

Thermal Shock

±[5%+0.05W]                                              Power rating 30min., -25C,15minutes

Vibration

±[2%+0.05W]                                10Hz-55Hz-10Hz (1min.), 2hrs. each direction

Moisture Load Life

±[3%+0.05W]   40C, 95% RH, 0.1XPower rating, 1.5h. on, 30min. off, 500 hrs.

Load Life

±[5%+0.05W]                                   Power rating 1.5hr. on, 30min. off, 500hours

SURFACE TEMPERATURE INCREASE VS POWER LOAD & DERATING



DIMENSIONS

Model
Dimensions [mm] Weight
[Kg]

L1+-2 L2+-2 L3+-2 H+-1 W+-0.5

IRM/ULM1600
330 315 290 100 50 2.5

IRM/ULM2000
440 385 360 100 50 3.1

IRM/ULM2400
480 465 440 100 50 3.7

IRM/ULM2800
550 535 510 100 50 4.3

FLYING LEADS

Model

5.5mm²

2mm²

UL3512 AWG10

UL3512 AWG14

IRM/ULM1600
0.3-0.99Ω 1Ω+ 0.3-0.99Ω 1Ω+

IRM/ULM2000
0.45-0.99Ω 0.45-0.99Ω

IRM/ULM2400
0.6-0.99Ω 0.6-0.99Ω

IRM/ULM2800
0.7-0.99Ω 0.7-0.99Ω

ORDERING PROCEDURE EXAMPLE

Model	Rated Power	Resistance Range		Resistance Tolerance
Model	Free Air	Inductive	Non-Inductive	Resistance Tolerance
IRM/ULM1600	570W	1.5-88	0.3-23	F[+-01%] J[+-05%] K[+-10%]
IRM/ULM2000	650W	2.0-113	0.45-30.5
IRM/ULM2400	720W	2.5-144	0.6-37
IRM/ULM2800	750W	3.0-135	0.7-33.5

Temperature Range	-55C to +200C
Insulation Resistance	20MW minimum
Dielectric Strength	AC1500V, 2500V, 3500V, 4500V for 1 min.; Max. leakage current: 2mA
Temp. Coefficient	±260ppm/C maximum
Short Time Overload	±[3%+0.05W] 10 X Power rating-5seconds
Moisture Resistance	±[3%+0.05W] 40C, 95% RH, DC100V case to terminal (500hrs.)
Thermal Shock	±[5%+0.05W] Power rating 30min., -25C,15minutes
Vibration	±[2%+0.05W] 10Hz-55Hz-10Hz (1min.), 2hrs. each direction
Moisture Load Life	±[3%+0.05W] 40C, 95% RH, 0.1XPower rating, 1.5h. on, 30min. off, 500 hrs.
Load Life	±[5%+0.05W] Power rating 1.5hr. on, 30min. off, 500hours

Model	Dimensions [mm]					Weight [Kg]
Model	L1+-2	L2+-2	L3+-2	H+-1	W+-0.5	Weight [Kg]
IRM/ULM1600	330	315	290	100	50	2.5
IRM/ULM2000	440	385	360	100	50	3.1
IRM/ULM2400	480	465	440	100	50	3.7
IRM/ULM2800	550	535	510	100	50	4.3

Model	5.5mm²	2mm²	UL3512 AWG10	UL3512 AWG14
IRM/ULM1600	0.3-0.99Ω	1Ω+	0.3-0.99Ω	1Ω+
IRM/ULM2000	0.45-0.99Ω		0.45-0.99Ω
IRM/ULM2400	0.6-0.99Ω		0.6-0.99Ω
IRM/ULM2800	0.7-0.99Ω		0.7-0.99Ω