Power Resistors

Q: What are power resistors and how do they work?

Power resistors are electronic components that convert electrical energy into heat in order to limit currents or stabilize voltages. Unlike standard resistors, they are designed for high power and are used in applications where reliable current regulation and thermal management are required. The resistance value defines how much the current flow is restricted, while the thermal design ensures that the heat generated is dissipated efficiently. Depending on the application, different technologies are used - e.g. wire wound, thick film or precision film resistors. ROTIMA AG offers a wide range of power resistors from renowned manufacturers such as Bourns and VPG Foil Resistors - ideal for industrial requirements, from power supplies to aerospace technology.

Q: Where are power resistors used?

Power resistors can be found in almost all areas of electronics in which high currents or voltages are processed. Typical applications include motor controls, power supplies, test and measuring devices, audio amplifiers or snubber circuits. They are also irreplaceable in battery management systems or telecommunications systems, as they adjust voltage levels and protect sensitive components from overload. High-quality power resistors not only offer thermal stability, but also low inductance - crucial for fast switching operations. ROTIMA AG supports customers in the selection of suitable resistor types, whether for series production or specialized industrial applications, in close cooperation with the manufacturers Bourns and VPG Foil Resistors.

Q: What designs and technologies do power resistors offer?

Power resistors are used wherever large currents need to be controlled, limited or measured. They play an important role in industry, energy supply, drive technology and measurement technology. There they ensure effective heat dissipation and contribute to the stability of electronic systems - even under demanding conditions. High-quality resistors offer high load capacity, low inductance and a long service life. Their reliability is particularly important in the event of frequent load changes or extreme temperatures. Whether in series production or in special designs - power resistors offer the right solution for many technical challenges. ROTIMA AG supports developers in the selection process and supplies robust components for durable and safe applications.

Q: What criteria are important when selecting technical power resistors?

Power resistors must meet various technical requirements. The maximum power value in watts, which indicates how much energy can be dissipated permanently, and the resistance value in ohms (Ω) are decisive. The temperature coefficient, the load capacity at ambient temperature and the behavior under pulse loads are also decisive. In addition, factors such as design, mounting type and environmental influences such as humidity or vibrations also play a role. Power resistors should be precisely matched to the respective application in order to ensure stable and safe operation in the circuit. ROTIMA AG offers expert advice and access to a wide range of leading manufacturers such as Bourns and VPG Foil Resistors, thus ensuring tailor-made solutions with power resistors in electronics development.

Q: What role does thermal management play in power resistors?

Thermal management plays a central role in the selection and design of power resistors. As these components convert electrical energy into heat in a targeted manner, the heat generated must be dissipated efficiently to prevent overheating and a drop in performance. The thermal resistance, the surface of the housing and the possibility of mounting on a heat sink have a decisive influence on heat dissipation. Designs such as TO-220 or TO-247 allow a direct thermal connection to heat sinks, while insulated back plates offer additional safety. The materials and production technologies, such as thick film or precision film, also have an influence on the thermal behavior of power resistors. Well thought-out thermal management helps to extend the service life of power resistors, increases operational reliability and ensures that stable continuous operation is guaranteed - even under high loads or in thermally demanding environments.

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Power resistors from VPG Foil Resistors

Wirewound

Resistance Range	0,1-1-1K Ω, 0,01-3K Ω, 0,1-4K Ω, 0,1-8K Ω, 0,01-0,1-15K Ω, 0,05 to 16K Ω, 0,05 to 22K Ω, 0,05 to 33K Ω, 0,05 to 50K Ω, 0,05 to 70K Ω, 0,01 - 50K Ω, 0,01 - 250K Ω
Tolerances	1 %. 5 %. 10 %, 0,5 %.1 %. 5 %, 1 %. 5 %, 0,5 %. 1 %. 5 %, 0,05 % - 5 %, 0,01 % - 10 %
Power (Watts)	60-100 - 500 W, 0,5-10 W, 0,5 - 4 W, 7,5 - 50 W, 20 - 100 W
Profile/Package Style	High Power Metal Clad Braking Resistor, Slim Profile High Power Metal Clad Braking Resistor, Surface Mount Wirewound, Aluminum Housed Wirewound, High Power Ceramic Wirewound Resistor

Wirewound product range

Power

Min. Resistance (Ω)	1-500m, 5-50
Max. Resistance (Ω)	1-500, 5-100m, 5M, 1-150K
Tolerance (±%)	0,01-10
TCR (±ppm/°C)	0,2-100
Rated Power (W)	5-2500
Typical Load Life Stability (±%)	0,01-1

Power product range

High Power Resistors

Resistance Range	0,1-1-1K Ω, 0,01-3K Ω, 0,1-4K Ω, 0,1-8K Ω, 0,01-0,1-15K Ω, 0,05 to 16K Ω, 0,05 to 22K Ω, 0,05 to 33K Ω, 0,05 to 50K Ω, 0,05 to 70K Ω, 0,01 - 50K Ω, 0,01 - 250K Ω
Tolerances	1 %. 5 %. 10 %, 0,5 %.1 %. 5 %, 1 %. 5 %, 0,5 %. 1 %. 5 %, 0,05 % - 5 %, 0,01 % - 10 %
Power (Watts)	60-100 - 500 W, 0,5-10 W, 0,5 - 4 W, 7,5 - 50 W, 20 - 100 W
Profile/Package Style	High Power Metal Clad Braking Resistor, Slim Profile High Power Metal Clad Braking Resistor, Surface Mount Wirewound, Aluminum Housed Wirewound, High Power Ceramic Wirewound Resistor

High Power Resistors product range

Robust power resistors for harsh environments

Power resistors play a central role in modern electronic systems. They are designed to process high electrical power reliably and dissipate heat efficiently at the same time. In contrast to conventional resistors, they have been developed for use with high currents and voltages - wherever stable current limitation and voltage adjustment are required.

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Power resistors for battery management systems

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Our range of power resistors

Wirewound

Series	Resistance Range	Tolerances	Temperature Coefficient	Power (Watts)	Profile/Package Style	MDS
BR/BRT	0.1-1K Ω	1 %, 5 %, 10 %	< 260 PPM/°C	60 - 500 W	High Power Metal Clad Braking Resistor	TBD
BRS	1-1K Ω	1 %, 5 %, 10 %	< 260 PPM/°C	100 - 500 W	Slim Profile High Power Metal Clad Braking Resistor	TBD
PWR2010	0.1-1K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	0.5 W	Surface Mount Wirewound	PWR2010
PWR2615	0.01-3K Ω	1 %, 5 %	±20 to ±150 ppm	1 W	Surface Mount Wirewound	PWR2615
PWR3014	0.1-4K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	1 W	Surface Mount Wirewound	PWR3014W
PWR4318	0.1-8K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	2 W	Surface Mount Wirewound	PWR4318W
PWR4525	0.01-15K Ω	1 %, 5 %	±20 to ±150 ppm	2 W	Surface Mount Wirewound	PWR4525
PWR5322	0.1-15K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	3 W	Surface Mount Wirewound	PWR5322W
PWR6927	0.05 to 16K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	3 W	Surface Mount Wirewound	PWR6927
PWR8030	0.05 to 22K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	5 W	Surface Mount Wirewound	PWR8030
PWR8937	0.05 to 33K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	5 W	Surface Mount Wirewound	PWR8937
PWRA247	0.05 to 50K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	7 W	Surface Mount Wirewound	PWRA247
PWRB053	0.05 to 70K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	10 W	Surface Mount Wirewound	PWRB053
S-SL	0.005 - 50K Ω	0.05 % - 5 %	±20 - ±150 ppm	0.5 - 4 W	Surface Mount Wirewound	SSL
UAL	0.01 - 250K Ω	0.01 % - 10 %	±20 - ±150 ppm	7.5 - 50 W	Aluminum Housed Wirewound	UAL
UWP	1-1K Ω	1 %, 5 %	< 260 PPM/°C	20 - 100 W	High Power Ceramic Wirewound Resistor	TBD

Power

Product Name	Min. Resistance (Ω)	Max. Resistance (Ω)	Tolerance (±%)	TCR (±ppm/°C)	Rated Power (W)	Typical Load Life Stability (±%)
FHR 2-80110	10m	500	0.5	50	600	0.1
FHR 2-8065	5m	50m	0.5	50	350	0.1
FHR 2-80216	2m	500	0.5	50	1200	0.1
FHR 2-80320	2m	500	0.5	50	2000	0.1
FHR 2-80370	5m	500	0.5	50	2500	0.1
KHN 2-T227	50m	5M	1	50	200	1
KPN 2-T227	50m	5M	1	50	100	1
KPR 2-T218	50m	100K	1	100	50	1
KHR 2-T218	50m	100K	1	100	100	1
KHR 2-T227	50m	5M	1	50	200	1
KHR 4-T227	50m	5M	1	50	200	1
KPR 4-T227	50m	5M	1	50	100	1
KHR 4-T600	50	300	10	100	600	1
KHR 4-T900	50	1K	10	100	900	1
NHR 2-T220	20m	15K	1	50	50	0.5
NHR 2-T221	20m	15K	1	50	50	0.5
NPR 2-T220	20m	100K	1	50	30	0.5
NPR 2-T221	20m	100K	1	50	30	0.5
NPS 2-T220	20m	100K	1	50	30	0.5
NPRS 2-T126B	25m	10K	1	100	25	0.5
NPRS 2-T220	20m	100K	1	50	30	0.5
NPS 2-T126B	25m	10K	1	100	25	0.5
SHLR 4-2321	1m	5m	0.1	2	40	0.1
SHLR 4-3825	1m	5m	0.1	2	50	0.1
SHLR 4-3825H	1m	5m	0.1	2	50	0.1
UNS 2-T220	500m	5K	0.01	3	15	0.01
USS 2-T220	500m	150K	0.01	3	10	0.01
CSM3637PY	2m	100m	0.1	15	5	0.2
VFP4	50m	500	0.01	2	10	0.05
VHP3	100m	80K	0.01	2	10	0.05
VHP4	50m	500	0.01	2	10	0.05
VHP4Z	250m	500	0.01	0.2	10	0.01
VPR220Z	5	10K	0.01	0.2	8	0.05
VPR220SZ	5	10K	0.01	0.2	8	0.05
PSB	1m	1	0.1	5	40	0.05
SHR 4-2820	1m	10m	0.2	70	10	0.5

High Power Resistors

Series	Resistance Range	Tolerances	Temperature Coefficient	Power (Watts)	Profile/Package Style	MDS
BR/BRT	0.1-1K Ω	1 %, 5 %, 10 %	< 260 PPM/°C	60 - 500 W	High Power Metal Clad Braking Resistor	TBD
BRS	1-1K Ω	1 %, 5 %, 10 %	< 260 PPM/°C	100 - 500 W	Slim Profile High Power Metal Clad Braking Resistor	TBD
PWR2010	0.1-1K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	0.5 W	Surface Mount Wirewound	PWR2010
PWR2615	0.01-3K Ω	1 %, 5 %	±20 to ±150 ppm	1 W	Surface Mount Wirewound	PWR2615
PWR3014	0.1-4K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	1 W	Surface Mount Wirewound	PWR3014W
PWR4318	0.1-8K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	2 W	Surface Mount Wirewound	PWR4318W
PWR4525	0.01-15K Ω	1 %, 5 %	±20 to ±150 ppm	2 W	Surface Mount Wirewound	PWR4525
PWR5322	0.1-15K Ω	0.5 %,1 %, 5 %	±20 to ±90 ppm	3 W	Surface Mount Wirewound	PWR5322W
PWR6927	0.05 to 16K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	3 W	Surface Mount Wirewound	PWR6927
PWR8030	0.05 to 22K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	5 W	Surface Mount Wirewound	PWR8030
PWR8937	0.05 to 33K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	5 W	Surface Mount Wirewound	PWR8937
PWRA247	0.05 to 50K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	7 W	Surface Mount Wirewound	PWRA247
PWRB053	0.05 to 70K Ω	0.5 %, 1 %, 5 %	±20 PPM/°C ~ ±300 PPM/°C	10 W	Surface Mount Wirewound	PWRB053
S-SL	0.005 - 50K Ω	0.05 % - 5 %	±20 - ±150 ppm	0.5 - 4 W	Surface Mount Wirewound	SSL
UAL	0.01 - 250K Ω	0.01 % - 10 %	±20 - ±150 ppm	7.5 - 50 W	Aluminum Housed Wirewound	UAL
UWP	1-1K Ω	1 %, 5 %	< 260 PPM/°C	20 - 100 W	High Power Ceramic Wirewound Resistor	TBD

Using power resistors for power supply systems

As an experienced distributor, Rotima AG offers high-performance solutions in the field of power resistors in close cooperation with the world's leading manufacturers Bourns and VPG Foil Resistors. Our customers benefit from a wide range of high power resistors specifically designed for industrial applications, power supply systems, motor controls or audio amplifiers.

Thanks to state-of-the-art technology, low inductance and high thermal stability, our products are also suitable for sensitive applications such as aviation or telecommunications. At Rotima AG, you not only receive reliable components, but also personal advice and technical support - for the safe and efficient integration of your power resistors.

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Technical properties of power resistors explained

Power resistors are designed in such a way that they can absorb large amounts of energy in the form of heat and dissipate it in a controlled manner. They typically consist of a resistor element on a ceramic or metallic carrier structure, which is realized using thick film, wire or foil technology, depending on the design. High-quality models such as those from Bourns or VPG Foil Resistors are characterized by low inductance, high thermal load capacity and precise resistance values. Electrical insulation from the heat sink and standardized housing shapes such as TO-220 or D2PAK enable easy integration into existing circuits. Power resistors regulate currents, protect sensitive components and stabilize operating voltages.

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Further information on power resistors

In this section, we have compiled the most important questions on the subject of power resistors for you. Here you will find useful information on the basics, the areas of application and the advantages of our products

What are power resistors and how do they work?

Power resistors are electronic components that convert electrical energy into heat in order to limit currents or stabilize voltages. Unlike standard resistors, they are designed for high power and are used in applications where reliable current regulation and thermal management are required. The re...

Where are power resistors used?

Power resistors can be found in almost all areas of electronics in which high currents or voltages are processed. Typical applications include motor controls, power supplies, test and measuring devices, audio amplifiers or snubber circuits. They are also irreplaceable in battery management systems ...

What designs and technologies do power resistors offer?

Power resistors are used wherever large currents need to be controlled, limited or measured. They play an important role in industry, energy supply, drive technology and measurement technology. There they ensure effective heat dissipation and contribute to the stability of electronic systems - even...

What criteria are important when selecting technical power resistors?

Power resistors must meet various technical requirements. The maximum power value in watts, which indicates how much energy can be dissipated permanently, and the resistance value in ohms (Ω) are decisive. The temperature coefficient, the load capacity at ambient temperature and the behavior under ...

What role does thermal management play in power resistors?

Thermal management plays a central role in the selection and design of power resistors. As these components convert electrical energy into heat in a targeted manner, the heat generated must be dissipated efficiently to prevent overheating and a drop in performance. The thermal resistance, the surfa...