The part number **L3-R15-10** typically refers to a high-power, chassis-mount **Wirewound Resistor**. This specific nomenclature is common among manufacturers like *Ohmite* or *Riedon*, where "L" often denotes an aluminum housed series, and "15" or "10" relates to wattage and resistance values. ### 1. Component Specifications Based on standard electronic component coding, here is the breakdown of the technical specifications for this part: | Parameter | Typical Value | Description | |:---|:---|:---| | **Component Type** | Wirewound Resistor | Designed for high power dissipation and stability. | | **Resistance Value** | 0.15 $\Omega$ or 15 $\Omega$* | Depends on the manufacturer’s decimal placement (R15 = 0.15 $\Omega$). | | **Tolerance** | $\pm$ 10% | Denoted by the "10" at the end of the string. | | **Housing Material** | Aluminum | Anodized aluminum casing for heat sink attachment. | | **Power Rating** | 10W - 25W | Usually determined by the physical size of the L3 frame. | --- ### 2. Key Features * **Heat Dissipation:** These parts are designed to be bolted directly to a metal chassis or heat sink. The aluminum housing conducts heat away from the internal resistive wire. * **Inductive Nature:** Because they are wirewound, they may have inherent inductance. They are best suited for DC or low-frequency AC applications. * **Durability:** They are vibration-resistant and encapsulated in a potting compound (usually epoxy or silicone) to protect against environmental factors. ### 3. Common Applications These resistors are used in circuits where high current needs to be managed or dissipated as heat: 1. **Current Sensing:** Low resistance values (like 0.15 $\Omega$) are used to measure current by monitoring the voltage drop across the resistor. 2. **Dynamic Braking:** Used in motor controllers to dissipate energy when a motor slows down. 3. **Inrush Limiting:** Limits the initial surge of current when power is first applied to a circuit. 4. **Dummy Loads:** Acts as a load for testing power supplies or amplifiers. --- ### 4. Mounting & Installation ```text [ Bolt Hole ] ___________________ [ Bolt Hole ] | | | | |_______| Aluminum |_______| (Terminal) | Housing | (Terminal) |___________________| ``` * **Thermal Paste:** For maximum efficiency, thermal grease should be applied between the resistor base and the mounting surface. * **Wiring:** Terminals are usually solder-lug style or threaded, depending on the specific L3 sub-variation. ---