The **C515-3-R** is a high-performance, time-delay (slow-blow) subminiature fuse belonging to the **C515 series** manufactured by Eaton (formerly Bussmann). It is specifically designed for primary circuit protection in compact electronic devices. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the C515-3-R: | Parameter | Value / Description | | :--- | :--- | | **Current Rating** | 3 Amperes (3A) | | **Voltage Rating (AC)** | 250 Volts | | **Fuse Type** | Time-Delay / Slow-Blow (T) | | **Form Factor** | 5mm x 15mm (Subminiature) | | **Termination Style** | Axial Leaded (Through-hole) | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Functional Characteristics The C515-3-R is engineered with specific behaviors to protect electronic circuits effectively: * **Time-Delay (Slow-Blow):** Unlike "fast-acting" fuses, this part is designed to withstand temporary current surges (inrush current) that occur when a device is first turned on. It will only blow if the overcurrent persists. * **Axial Leads:** The "pigtail" leads are soldered directly into a Printed Circuit Board (PCB), eliminating the need for a separate fuse clip or holder, which saves space and reduces costs. * **Interrupting Rating:** It typically features an interrupting rating of 100A at 250VAC, meaning it can safely break a fault current of up to 100 Amps without the glass tube shattering. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: 1. **C515:** The series name (5mm x 15mm glass body). 2. **3:** The amperage rating (3 Amps). 3. **-R:** RoHS compliance (Lead-free and environmentally friendly). --- ### 4. Common Applications Due to its small size and surge-tolerant nature, the C515-3-R is commonly found in: * **Power Supplies:** Protecting the input stage of AC/DC adapters. * **Consumer Electronics:** Televisions, chargers, and audio equipment. * **Industrial Control:** Small motor circuits and PLC protection where space is limited. * **LED Lighting:** Drivers that experience high initial capacitive inrush.