What are Power Resistors?

Power resistors are passive components designed to dissipate electrical energy as heat while maintaining a defined resistance value under high current and high voltage conditions. They are constructed using resistive elements and thermal management structures that enable stable operation under significant electrical and thermal stress. Their primary function is to control current flow, divide voltage, or absorb excess energy within power electronic circuits.

In power conversion, motor control, braking circuits, load banks, and protection networks, power resistors are critical for managing energy and ensuring safe operation. Electrical parameters such as resistance value, tolerance, power dissipation capability, and voltage rating determine their suitability for specific applications. Proper specification ensures controlled heat generation, predictable electrical behavior, and long-term reliability in demanding operating environments.

Key Specifications

• Resistance: Specifies the nominal opposition to current flow expressed in ohms. The resistance value determines current magnitude, voltage drop, and power dissipation within the circuit according to fundamental electrical relationships.
• Tolerance: Indicates the permissible deviation of the actual resistance from its nominal value. Tolerance affects accuracy in current limiting, voltage division, and precision control applications.
• Power Rating: Defines the maximum continuous power the resistor can dissipate without exceeding its thermal limits. Power rating is directly related to temperature rise, cooling requirements, and long-term stability under load.
• Voltage Rating: Represents the maximum voltage that can be applied across the resistor without causing insulation breakdown or internal arcing. This parameter ensures safe operation under steady-state and transient voltage conditions.

The Largest Database of Power Resistors

everything PE has listed Power Resistors from the leading manufacturers and made them searchable by specification. You can enter the key parameters and the search tool will scan catalogs from the leading manufacturers to identify products that meet your spec. Once you find Power Resistors that meet your requirements, you can view product information, download datasheets or request quotations. Quotation requests will be routed to the manufacturer of the product who will get back to you directly. The quotation will also be routed to distributors of the product in your region.