Webspecifically defines selective coordination in Article 100. Selective coordination applies for the full range of overcurrents on the system and the full range of overcurrent device interrupting times associated with those overcurrents. Selective coordination is required for systems related to life safety as defined by: • Elevators – 620.62 WebThe selectivity limit current is the value at which the let-through energy I 2 t of the circuit-breaker exceeds the pre-arcing I 2 t of the fuse (curve or value provided by the manufacturer). Advice: To ensure full selectivity between the upstream fuse and the downstream circuit-breaker, we recommend replacing the upstream fuse after clearance ...
How to Select a Fuse Electronic Design
WebTo verify selectivity between upstream fuses in parallel and downstream breakers, the following rules have been considered: 1. The let-through energy i2t of the downstream circuit breaker shall be lower than the pre-arcing I2t of the upstream fuse, multiplied by the square value of the number of fuses in parallel. 2. WebAug 1, 2010 · Fuses protect against overcurrent events by melting their elements and opening the circuit. Fuses must be applied at or below their specified voltage rating, which differs between ac and dc current. mango beach shop puerto rico
How to Select a Fuse Electronic Design
WebOur selective coordination look-up tables are quick and easy to use. They comprise multiple tables for main (or upstream) and branch breakers. Simply match the required main and … Webconvenience, it is meant to serve as a guide for product selection. We suggest you check all applicable specifications before making substitutions. For special applications, more complete information, and for fuse block and medium voltage fuse cross referencing, visit Littelfuse.com or call 1-800-TEC-FUSE (1-800-832-3873). WebJul 16, 2010 · Table 1: Fuse Selectivity Amp Rating Ratio Guide . Conclusion: This circuit path is selectively coordinated for any overcurrent up to 200 kA; therefore, X 1 and X 2 … mango beach resort phu quoc