The **HTB-32M-R** is a high-performance fuse holder manufactured by **Eaton (formerly Bussmann)**. It is specifically designed for panel mounting and is widely used in industrial, medical, and consumer electronics to protect circuits from overcurrent. --- ### 1. Key Technical Specifications The table below summarizes the core electronic and mechanical parameters of the HTB-32M-R: | Parameter | Specification | |:---|:---| | **Fuse Size Compatibility** | 5mm x 20mm | | **Current Rating** | 16 Amps (UL) / 6.3 Amps (VDE) | | **Voltage Rating** | 250 Volts AC | | **Mounting Type** | Panel Mount | | **Termination Style** | 1/4" Quick-Connect / Solder Terminals | | **Body Material** | High-temperature thermoplastic | | **Knob Type** | Screwdriver slotted (low profile) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Components The HTB-32M-R consists of several critical electronic and structural parts: * **The Knob (Cap):** A "screwdriver" style cap that secures the fuse inside the body. It features a bayonet-style locking mechanism to ensure the fuse remains seated under vibration. * **The Body:** Made from flame-retardant thermoplastic (UL 94V0 rated) to prevent melting or fire during a short-circuit event. * **Terminals:** Rear-facing metal contacts. The "32" in the part number indicates these are **1/4" quick-connect** terminals, which can also be soldered for a more permanent connection. * **Internal Contacts:** Tin-plated copper alloy contacts that ensure low electrical resistance between the fuse and the external circuit. --- ### 3. Part Number Breakdown Understanding the nomenclature helps identify specific features of this electronic part: * **HTB:** High-temperature series panel-mount fuse holder. * **3:** Indicates the terminal configuration (in this case, 1/4" Quick-connect / Solder). * **2:** Indicates the rear terminal orientation (straight). * **M:** Indicates the fuse size compatibility (5mm x 20mm metric fuses). * **R:** Indicates RoHS compliance (Restriction of Hazardous Substances). --- ### 4. Circuit Protection Role The HTB-32M-R acts as a **bridge** between the power supply and the device's internal circuitry. 1. **Safety:** It isolates the high-voltage fuse from the user. 2. **Accessibility:** It allows for "front-panel" fuse replacement without opening the entire chassis. 3. **Protection:** It ensures that if the fuse blows, the heat generated is contained within the thermally stable housing.