The **5TTP 3-R** is a specific type of electronic protection component, categorized as a **Time-Lag (Slow-Blow) Axial Lead Glass Tube Fuse**. It is part of the 5TTP series manufactured by Bel Fuse Inc. ### Technical Specifications Below are the primary technical parameters for the 5TTP 3-R: | Parameter | Specification | |:---|:---| | **Rated Current** | 3 Amperes (3A) | | **Voltage Rating (AC)** | 250 Volts | | **Fuse Characteristic** | Time-Lag / Slow-Blow (T) | | **Body Material** | Glass | | **Termination Style** | Axial Leaded (Pigtail) | | **Dimensions** | 5mm x 20mm | | **Compliance** | RoHS 6 Compliant (-R suffix) | --- ### Key Features and Design #### 1. Time-Lag (Slow-Blow) Characteristic Unlike "Fast-Acting" fuses, the 5TTP 3-R is designed to withstand temporary surges in current (inrush current). This is essential for devices with motors or large capacitors that draw a spike of power upon startup but operate at lower levels afterward. #### 2. Axial Leads The "P" in the part number indicates **Pigtail leads**. These are wire leads soldered to the end caps of the fuse. This design is intended for **through-hole mounting** directly onto a Printed Circuit Board (PCB), eliminating the need for a separate fuse clip or holder. #### 3. Construction * **Glass Tube:** Allows for easy visual inspection to see if the internal filament has melted. * **RoHS Compliant:** The "-R" suffix confirms that the part is lead-free and meets environmental safety standards. --- ### Common Applications The 5TTP 3-R is typically found in power supplies and consumer electronics where space is limited and vibration resistance (provided by direct soldering) is required. * Power Adapters * Industrial LED lighting drivers * Small motor controllers * Battery chargers --- ### Part Number Breakdown `5TTP` `3` `-R` * **5TTP:** Series designation (5x20mm, Time-Lag, Axial Leads). * **3:** Amperage rating (3 Amps). * **-R:** RoHS compliant.