Siemens Diazed fuse links, type 5SB4 21, rated 50A at 500V AC, utilization category gL/gG, in original factory box of five pieces. These fuses are new and never used, showing only light storage marks on the metal caps.
Brand: Siemens
Model: 5SB4 21 (5SB421 Diazed fuse link series)
Type: Diazed DIII bottle fuse link for cable and line protection
Size: DIII, E33 thread size
Current rating: 50 A
Voltage rating: 500 V AC (also suitable up to 500 V DC in many applications – see datasheet)
Utilization category: gL/gG general‑purpose fuse link
Application: Cable and line protection in low‑voltage distribution and control panels
Approvals: CE marked; designed according to IEC/DIN standards for Diazed systems
Quantity: 1 box containing 5 fuse links
New, never installed fuses
Box opened for inspection/photos; inner contents appear unused
Some dust and minor oxidation spots visible on fuse end caps from shelf storage
Outer cardboard packaging shows light handling wear, small marks and edge dents
No datasheet or additional documentation included in the box
Genuine Siemens SENTRON Diazed fuses, suitable as direct replacements where DIII 50A gG links are specified.
Buyer should confirm compatibility with their existing DIII (E33) fuse bases and local electrical codes before installation.
Installation and replacement should be performed by qualified electrical personnel.
