The **5HT 1.6-R** is a specific model of subminiature, radial-leaded, time-lag (slow-blow) fuse. It is commonly used in power supplies, chargers, and consumer electronics to protect circuits against overcurrent conditions. --- ### ## Technical Specifications Below are the primary electronic characteristics of the 5HT 1.6-R: | Parameter | Specification | | :--- | :--- | | **Rated Current** | 1.6 Amperes (1.6A) | | **Rated Voltage** | 250V AC | | **Fuse Type** | Time-Lag / Slow-Blow (T) | | **Form Factor** | Radial Lead (Round/Cylindrical) | | **Breaking Capacity** | 35A or 10x rated current (at 250V AC) | | **Operating Temp** | -55°C to +125°C | | **Standards** | IEC 60127-3, Sheet 4 | --- ### ### Key Electronic Components & Materials 1. **Fusible Element:** A specially coiled wire or wire with a "M-spot" (soldered drop) that creates a thermal delay. This allows the fuse to withstand temporary surges (like inrush current) without blowing. 2. **Casing:** Usually made of thermoplastic (polyamide) or ceramic, which is flame-retardant and provides high insulation resistance. 3. **Leads:** Tin-plated copper wires designed for Through-Hole Technology (THT) mounting on a PCB. --- ### ### Core Functionality * **Time-Lag Property:** Unlike "Fast-Acting" fuses, the 5HT 1.6-R is designed to open only if the overcurrent persists. This is crucial for devices with capacitors or motors that draw a high initial "inrush" current. * **Protection Mechanism:** When current exceeds 1.6A significantly, the internal element heats up via Joule heating ($P = I^2R$). If the heat exceeds the melting point of the element, the circuit breaks. --- ### ### Typical Application Circuit In a power supply circuit, the fuse is placed immediately after the AC input: ```mermaid graph LR A[AC Input] --> B[5HT 1.6-R Fuse] B --> C[Bridge Rectifier] C --> D[Filter Capacitor] D --> E[DC Output] ```