0216008.MXEP

FAQFrequently Asked Questions

• Can the Littelfuse 0216008.MXEP 8A fuse handle both AC and DC circuit protection, or should I select a different part for DC applications? The 0216008.MXEP is rated for 250V AC/DC operation, meaning it functions in both AC and DC circuits. However, DC applications present different arc-extinction challenges than AC circuits. The 0216008.MXEP's ceramic body and fast-blow characteristics suit AC mains protection effectively. For DC circuits, verify that your system voltage does not exceed 250V and confirm the fuse's breaking capacity (1.5 kA) matches your fault current expectations. If your DC circuit exhibits high fault currents or operates at voltages near the 250V limit, consult the full datasheet thermal and arc characteristics to ensure reliable operation.
• What is the actual melting time and current threshold for the Littelfuse 0216008.MXEP before it interrupts a fault? The 0216008.MXEP carries a melting I²t value of 64.315, which describes the thermal energy required to melt the fuse element. Fast-blow fuses like the 0216008.MXEP respond quickly to overcurrent; however, melting time depends on the magnitude of overcurrent. A modest overload slightly above 8A will trigger slower melting, while a severe fault current will cause near-instantaneous operation. The 64.315 I²t specification allows you to calculate expected melting time for specific fault scenarios: lower overcurrent multiples produce longer delays, while high fault currents (approaching the 1.5 kA breaking capacity) produce nearly immediate response. Reference the manufacturer's time-current curves for precise melting behavior at your anticipated fault levels.
• Is the Littelfuse 0216008.MXEP suitable for protecting switch-mode power supplies, or does its fast-blow response create nuisance trips during inrush current? Fast-blow fuses like the 0216008.MXEP are designed for steady-state current protection and offer minimal tolerance for inrush transients. Switch-mode power supplies typically draw high instantaneous current during startup. The 0216008.MXEP's rapid response may cause nuisance failures if inrush current exceeds approximately 1.5 to 2 times the rated 8A during the first milliseconds. If your SMPS experiences significant inrush, consider either selecting a slow-blow alternative (if available in Littelfuse's 216 series), adding soft-start circuitry to limit inrush, or verifying your actual inrush current does not trigger the fuse's fast-blow characteristic. Consult your power supply design documentation for peak inrush magnitude before final fuse selection.
• Can I substitute a 0216008.MXEP with the 5HFP 8-R or other listed alternatives, and what design differences should I account for? The 0216008.MXEP datasheet lists 5HFP 8-R, 0216008.MXE, 0216008.MRET1P, 0001.1013.PT, and 5HFP 8 as substitutes. These alternatives may differ in manufacturing tolerances, ceramic material composition, contact plating, or breaking capacity. The 0216008.MXEP maintains a 1.5 kA breaking capacity and 64.315 I²t rating; verify that any substitute carries identical or superior breaking capacity to ensure fault protection remains valid. Additionally, confirm voltage ratings (250V AC/DC) and response time classification match your application. Some substitutes may be sourced from different manufacturers or regional suppliers, potentially affecting lead time and cost. Review the substitute datasheet for any differences in operating temperature range or DC cold resistance before swapping parts in production designs.
• What is the DC cold resistance of the Littelfuse 0216008.MXEP, and does it affect power dissipation in low-voltage DC circuits? The 0216008.MXEP exhibits a DC cold resistance of 0.0123 Ohms when measured at 20°C. In low-voltage DC circuits, this resistance generates heat during normal operation. For an 8A continuous load, power dissipation equals I²R = (8)² × 0.0123 = 0.787 watts. While modest, this dissipation can raise the fuse element temperature, potentially affecting its thermal response and melting threshold. In compact enclosures or high-ambient-temperature applications, ensure adequate ventilation around the fuse to prevent additional thermal stress. If your circuit operates near the fuse's 8A rating for extended periods in confined spaces, account for the 0.0123 Ohm resistance when calculating total system losses and thermal management.
• Does the Littelfuse 0216008.MXEP meet automotive or transportation safety standards, or is it limited to industrial/commercial applications? The 0216008.MXEP carries approvals from CE, CSA, KC, PSE, SEMKO, TÜV, and UR—primarily international industrial and consumer safety certifications. These certifications comply with general electronics safety standards but do not inherently cover automotive-specific requirements such as AEC-Q200: (automotive passive component qualification). If your application requires automotive use, verify that the 0216008.MXEP or an equivalent automotive-qualified variant (often designated with AEC or similar qualification) is approved for your vehicle's operating temperature, vibration, and humidity environment. Automotive fuses typically undergo additional thermal cycling and vibration testing not reflected in general industrial certifications. Consult Littelfuse's automotive product line for parts explicitly qualified to automotive standards if needed.
• How does the operating temperature range of -55°C to 125°C affect the 0216008.MXEP's trip point in extreme environments? The 0216008.MXEP operates across -55°C to 125°C, but fuse melting characteristics shift with temperature. At elevated temperatures, the fuse element reaches its melting point at lower overcurrent levels because thermal energy already present in the element reduces the energy margin before fusion. Conversely, at -55°C, the element is thermally stable and may require higher overcurrent or longer duration to trigger melting. The 64.315 I²t specification is typically measured at 20°C; in extreme temperature environments, actual melting behavior deviates from nominal values. For applications operating consistently above 100°C or below -20°C, request temperature-compensated time-current curves from Littelfuse or perform prototype testing to confirm the fuse reliably protects your circuit across the full operating range without nuisance trips or delayed response.
• The 0216008.MXEP is RoHS3 compliant and REACH unaffected—what do these certifications mean for supply chain and long-term design support? RoHS3 compliance confirms the 0216008.MXEP contains no restricted substances (lead, cadmium, mercury, etc.) above regulatory thresholds, making it suitable for equipment sold in the EU and other RoHS-regulated regions. REACH Unaffected status indicates the part does not trigger additional chemical registration or documentation requirements under EU chemical regulations. These certifications support long-term design support and reduce the risk of component obsolescence driven by chemical regulations. However, RoHS3 compliance does not guarantee perpetual availability; Littelfuse may discontinue the 0216008.MXEP if demand declines. Design your circuit to accept the listed substitutes (5HFP 8-R, 0216008.MXE, etc.) to preserve flexibility if the primary part number reaches end-of-life. Maintain design documentation noting approved alternatives to streamline sourcing if a transition becomes necessary.
• In a 250VAC application with a maximum fault current of 1.2 kA, is the 0216008.MXEP's 1.5 kA breaking capacity adequate, or should I specify a higher-capacity fuse? The 0216008.MXEP breaks up to 1.5 kA at its rated 250VAC voltage, which exceeds your specified 1.2 kA fault current by 25%. This margin generally provides safe operation; the fuse will reliably interrupt the fault without uncontrolled arcing or rupture. However, breaking capacity includes design safety margins and assumes proper fuse holder contact pressure and thermal design. In applications with frequent faults or extreme ambient temperatures, the actual safe interruption current may degrade over time. Verify that your fuse holder design (contact force, spacing, holder material) meets Littelfuse's installation requirements. If your application will experience repeated fault events or if safety margins are critical, consider specifying a fuse with higher breaking capacity (such as a 0216 series variant rated for 3 kA or higher) to ensure consistent performance over the product lifetime.
• What mounting and holder considerations apply to the 0216008.MXEP's 5mm x 20mm form factor, and are there common compatibility issues? The 0216008.MXEP is a 5mm diameter, 20mm length cartridge fuse designed for through-hole mounting in standard 5x20mm fuse holders. While this form factor is common, fuse holder quality varies significantly across manufacturers. Poor contact pressure, corrosion, or loose-fitting holders reduce effective current carrying capacity and increase contact resistance. Verify that your fuse holder is rated for 8A continuous current and 250V AC/DC at minimum. Ceramic bodies (as in the 0216008.MXEP) are robust but can develop micro-cracks if over-torqued during installation or subjected to vibration without proper mounting strain relief. In high-vibration environments (industrial machinery, transportation), secure the fuse holder with mechanical support to prevent movement. Additionally, confirm the fuse holder contacts are clean and corrosion-free; oxidation on contact surfaces increases resistance and reduces fuse reliability.