The **3SBP63-R** is a specific model of a subminiature, slow-blow (time-delay) fuse manufactured by **Bel Fuse Inc.** It belongs to the **3SBP** series, which is widely used for primary circuit protection in various electronic devices. --- ### ## Technical Specifications The following table outlines the key electrical and physical characteristics of the **3SBP63-R**: | Property | Specification | | :--- | :--- | | **Current Rating** | 63mA (0.063A) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Glass Body / Cartridge | | **Response Characteristic** | Slow-Blow (Time-Delay) | | **Size / Dimension** | 6.3mm x 32mm (1/4" x 1-1/4") | | **Termination Style** | Pigtail Leads (Axial) | | **Material** | Glass tube with silver-plated brass end caps | | **RoHS Status** | Compliant (Indicated by the "-R" suffix) | --- ### ## Key Features and Construction 1. **Slow-Blow (Time-Delay) Characteristic:** Unlike fast-acting fuses, the 3SBP63-R is designed to withstand temporary surges or "inrush currents." It will only blow if the overcurrent persists, preventing nuisance blowing during device startup. 2. **Pigtail Leads (Axial Leads):** The "P" in the prefix usually denotes pigtail leads. These are wire leads soldered to the end caps, allowing the fuse to be soldered directly onto a Printed Circuit Board (PCB) without a fuse holder. 3. **Low Amperage:** At **63mA**, this fuse is intended for highly sensitive low-power electronic circuits, such as control transformers or telecommunications equipment. --- ### ## Application Areas * **Power Supplies:** Protecting the input stage from sustained overcurrent. * **Industrial Controls:** Safeguarding PLC inputs or sensitive sensors. * **Consumer Electronics:** Used in high-end audio equipment or specialized appliances where space is limited. * **Telecommunications:** Protection for circuit boards in networking hardware. --- ### ## Identification Code Breakdown | Part Segment | Meaning | | :--- | :--- | | **3SB** | Series Name (Standard Slow-Blow) | | **P** | Pigtail (Axial Lead) configuration | | **63** | 63mA Current Rating | | **-R** | RoHS (Lead-Free) Compliant |