Lead Free

POWER -NIKKOHM

RoHS 21600, 2000, 2400, 2800 W

Metal Clad Wire Wound Resistors
ULM1600, ULM2000, ULM2400, ULM2800
IRM1600, IRM2000, IRM2400, IRM2800

Features and Applications
1600W to 2800W (on chassis) metal clad wire wound resistors, UL certified (ULM).
Minimum resistance value of 0.3 Ω and inductive and non inductive winding are available.
Metal tab terminals and wire leaded terminals are available.
Current detection, motor control, recycle braking resistor and dumping resistor of the power electronics.

B
2.02-6.3 dia.

16C

5.3+/-0.530+/-0.5Dimensions (mm)E

18+/-3DAB

For the markings of IRM1600, IRM2000, IRM2400, and IRM2800 is NIKKOHM as the quality assurance company.
For ULM1600, ULM2000, ULM2400, ULM2800 have the marking of UL application company RARA on the resistor..
These 8 types do not have wire terminal resistors, but metal terminal (TAB) only.

(mm)
ULM1600
ULM2000
ULM2400
ULM2800

A±2330400480550

B±0.55050
5050C±0.5100
100
100
100

D±2315385465535

E±2290360
440510Weight (kg)2.5
3.1
3.74.3IRM1600
IRM2000
IRM2400
IRM2800

330400480550

50505050100100100100315
385465
535

290
360
440
510

2.5
3.1
3.7
4.3

Nikkohm Co., Ltd. 3-31-2640 Minamicho, Misawa, Aomori 033-0036 Japan TEL: +81-176-53-2105, FAX: +81-176-53-2106© Nikkohm Co., Ltd.
URL: http://www.nikkohm.co.jp & http://www.nikkohm.com / e-mail: info@nikkohm.co.jp

Lead Free

POWER -NIKKOHM

RoHS 21600, 2000, 2400, 2800 W Metal Clad Wire Wound Resistors
ULM1600, ULM2000, ULM2400, ULM2800
IRM1600, IRM2000, IRM2400, IRM2800
Ordering InformationTypeInd./non-ind.
ULM2800N||
ULM1600--- (inductive)
ULM2000
N (non-inductive)
ULM2400
ULM2800
IRM1600
IRM2000
IRM2400
IRM2800
Note: Tolerance +/-5%(J) is standard.

Resistance
50 ohm|See table

ToleranceJ|+/-1.0% (F)+/-5.0% (J)Terminals
L|
TAB (metal)
FL xxx mm (Fly wire)

Voltage
4500V
|
1500V
2500V
3400V
4500V

Rated Power and ResistanceResistance (ohm)
Rated Power
Rated Poweron chassis
in free air
Non inductive
ULM1600 / IRM1600
1600W
570 W
1.5 - 88.0
ULM2000 / IRM2000
2000W
650 W
2.0 – 113.0
ULM2400 / IRM2400
2400W
720 W
2.5 – 144.0
ULM2800 / IRM2800
2800W
750 W
3.0 – 135.0
Note: Resistance range in IRM1600-2800 model can extend to 10kohm, call factory.
TypeResistance (ohm)Inductive
0.30 - 23.0
0.45 - 30.5
0.60 - 37.0
0.70 - 33.5

Tolerance (%)
F (1%), J(5%)
F (1%), J(5%)
F (1%), J(5%)
F (1%), J(5%)

Performances
Category Temperature, Ambient
Insulation Resistance
Voltage Proof
Temperature Coefficient
Short Time OverloadMoisture Resistance
Thermal ShockVibration
Humidity
Load Life+/- 3.0%+/- 3.0%+/- 5.0%+/- 2.0%+/- 3.0%+/- 5.0%

Surface Temperature Rise (°C)

-55 °C to +200 °C
Minimum 20MΩAC 1500, 2500, 3500, 4500V for 1 min. - 2mA+/- 260ppm/K in maximum
10 times rated power – 5 seconds
40 °C, 95%RH, DC100V case-terminal, 500 hours
Power rating 30 minutes – minus 25 °C15 minutes
10Hz-55Hz-10Hz, 1 minutes, 2 hours, x-y z direction
40°C, 95%RH, 0.1 rated power 1.5 hours on, 0.5 hours off, 500 hours
Rated power, 1.5 hours on 0.5 hours off, 500 hours

Derating (% Rated Power)

500

100%2800 W
2400 W
2000 W
1600 W

400

60%

200

40%

10020%

010203040% Rated Power50

1600-2000-2400-2800 W with heat sink

80%

300

0Typical heat sink size 1200mm x 1200mm x 5mm

0%1600 W in free air
2000 W in free air
2400 W in free air
2800 W in free air

-50

050

100 150 200
250
Ambient Temperature (°C)

300

350

20210401
Nikkohm Co., Ltd. 3-31-2640 Minamicho, Misawa, Aomori 033-0036 Japan TEL: +81-176-53-2105, FAX: +81-176-53-2106© Nikkohm Co., Ltd.
URL: http://www.nikkohm.co.jp & http://www.nikkohm.com / e-mail: info@nikkohm.co.jp