Catalogs >
Watlow Electric Manufacturing Company >
Combined Branch Protection and Semiconductor Fusing

Combined Branch Protection and Semiconductor Fusing
2Pages

Catalog excerpts

Combined Branch Protection and Semiconductor Fusing - 1

SPECIFICATION SHEET Combined Branch Protection and Semiconductor Fusing Protect Branch Circuits and Solid State Power Controllers With One Fuse To meet national and local electrical code requirements for branch circuit protection and to protect solid state power controllers, such as Watlow's DIN-A-MITE®, a DFJ fuse is recommended. Watlow® offers fast-acting DFJ fuses and holders in amperage ratings covering the range of load currents appropriate for use with the entire DIN-A-MITE power controller and EZ-ZONE® ST integrated controller families. DFJ fuses protect personnel from injury, protect equipment from damage and are required to minimize damage in the event of a short circuit and achieve short circuit current ratings for Watlow DIN-A-MITE power controllers and EZ-ZONE ST controllers. Features and Benefits Combination semiconductor and branch circuit protection • Fulfills electrical code requirements for branch circuit protection • Provides protection required for short circuit rating (SCCR) of Watlow products up to 200kA • Protects valuable semiconductor-based power controllers from damage in the event of a shorted heater • Simplifies cabinet design • Reduces wiring time • Reduces number of components and cost DIN-rail mount • Ensures easy installation Lockout/tagout • Protects service personnel Open fuse indicator • Provides quick troubleshooting of blown fuses

Open the catalog to page 1

Combined Branch Protection and Semiconductor Fusing - 2

Fuse Selection Guide Use a DFJ fuse to protect both a branch circuit or power cable and the solid state power controller on the circuit with a single fuse. 1. elect a fuse with an amperage rating at least 125 percent of the connected load (or the next standard size above.) S 2. Select a fuse with an I2t rating not greater than the I2t rating of the solid state power controller. See the specification sheet for the power controller to be protected for I2t specification. See DFJ fuse I2t below. 3. se a Watlow recommended fuse. SCCR ratings for Watlow power controllers are only valid with...

Open the catalog to page 2