50W 25 Ohm Aluminum Case Wirewound Resistor - Resistance Tolerance ±5% 25r - 5 Pack

50W 25 Ohm Aluminum Housed Wirewound Resistor (±5%)

Key Features

• Maximum Heat Dissipation: Encased in a rugged, extruded aluminum housing featuring deep cooling fins, designed to rapidly pull heat away from the internal wirewound element and disperse it into a mounted chassis.
• High-Stability Wirewound Core: The internal resistance element is tightly wound around a ceramic core, providing excellent stability, high surge-current capability, and minimal resistance change over a wide temperature range.
• Precision Tolerance: Manufactured to a strict ±5% resistance tolerance (J-Class), ensuring highly accurate and reliable electrical performance for sensitive circuits and load testing.
• Harsh Environment Protection: The internal components are completely encapsulated in a high-temperature silicone molding compound, making the resistor highly resistant to moisture, vibration, and severe mechanical shock.
• Easy Chassis Mounting: Features built-in, pre-drilled metal flanges on both sides of the casing, allowing for secure screw or bolt mounting directly to a metal heatsink or vehicle frame.

Product Specifications

• Rated Power: 50 Watts.
• Resistance Value: 25 Ohms (25Ω / 25R).
• Resistance Tolerance: ±5% (Standard J).
• Casing Material: Gold-anodized Aluminum.
• Connection Type: Standard solder lugs / wire eyelets.

Universal Compatibility & Applications

This high-power wirewound resistor is a versatile component essential for high-current and power-dissipation projects, including:

• Automotive Lighting: Frequently used as a load resistor to fix LED turn signal "hyper-flashing" or dashboard error codes by simulating the electrical draw of a standard incandescent bulb.
• Audio Systems: Utilized in custom crossover networks for high-fidelity speaker systems or as dummy loads for testing audio amplifier output power.
• Industrial Controls: Used in motor speed control circuits, variable frequency drives (VFDs), and heavy-duty power supply regulation.
• Electronic Prototyping: Excellent for general-purpose current limiting, voltage dropping, or as a robust discharge resistor for large capacitor banks.

When to Use or Replace

• LED Hyper-Flash Correction: If you install new LED blinkers on a vehicle and they flash twice as fast as normal, splicing this resistor in parallel with the bulb will restore the normal flash rate.
• Burned or Open Resistors: If an existing ceramic or cement resistor has cracked, turned black, or shows infinite resistance on a multimeter (open circuit), it has failed and must be replaced.
• Power Supply Testing: When building or repairing a power supply, use this as a dummy load to safely test the output voltage under a heavy 50W electrical draw without risking actual equipment.

Installation & Wiring Tips

• Safety First (CRITICAL): Ensure all power to the circuit is completely disconnected and capacitors are safely discharged before soldering or handling power components.
• Heatsink Required for Full Power (PRO TIP): To safely dissipate a continuous 50 Watts, this resistor must be bolted tightly to an adequate metal heatsink or chassis. Running it in open air at maximum capacity will cause it to overheat and fail.
• Use Thermal Paste: For optimal performance, apply a thin layer of thermal compound (PC CPU paste works perfectly) between the flat bottom of the resistor and your metal mounting surface.
• Avoid Plastic Surfaces: During operation, the aluminum casing can easily exceed temperatures that will melt plastic, zip-ties, or wiring insulation. Mount it strictly to metal surfaces and route wires safely away from the casing.
• Secure Soldering: Because this component handles high current and generates heat, ensure your wire connections are mechanically secure through the lug holes before applying a heavy bead of solder.