The **5TTP 4-R** is a specific type of electronic component—specifically a **time-delay glass tube fuse**. It is manufactured by companies like Bel Fuse Inc. and is designed to protect electronic circuits from overcurrent conditions. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the 5TTP 4-R: | Feature | Specification | | :--- | :--- | | **Part Number** | 5TTP 4-R | | **Current Rating** | 4 Amperes (4A) | | **Voltage Rating (AC)** | 125V / 250V | | **Fuse Type** | Time-Delay (Slow Blow) | | **Material** | Glass Body / Nickel Plated Brass Caps | | **Dimensions** | 5mm x 20mm | | **Termination Style** | Pigtail Leads (Axial Through-Hole) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### ## Detailed Breakdown of the Part Name 1. **5TTP**: This indicates the series. The "5" refers to the 5mm diameter, and "TTP" typically denotes a **Time-Lag (Slow Blow)** characteristic with **Pigtail** leads (wires attached to the ends for soldering directly onto a PCB). 2. **4**: This represents the continuous current rating, which is **4 Amps**. 3. **-R**: This suffix signifies that the part is **RoHS compliant** (Lead-free), meeting environmental safety standards. --- ### ## Key Features and Applications #### ### 1. Time-Delay (Slow Blow) Functionality Unlike "Fast-Acting" fuses, a Slow-Blow fuse is designed to ignore short-term high-current spikes. This is critical for devices that have an **inrush current** (a surge of power when first turned on, like motors or power supplies). It will only blow if the overcurrent persists. #### ### 2. Pigtail Design The "P" in TTP indicates that this fuse has axial leads. Instead of being placed in a removable fuse holder, this part is intended to be **soldered directly onto a Printed Circuit Board (PCB)**. #### ### 3. Primary Applications * **Power Supplies:** Protecting the input stage from surges. * **Consumer Electronics:** Televisions, chargers, and audio equipment. * **Industrial Equipment:** Small motors or controllers where space is limited. ---