Solid-State Switching Devices for Resistive Loads Solid-State Relays 3RF22 solid-state relays, three-phase, 45 mm Fused version with semiconductor protection (similar to type of coordination "2") 1) The semiconductor protection for the 3RF22 controls can be used with different protective devices. Siemens recommends the use of special SITOR semiconductor fuses. The table below lists the maximum permissible fuses for each 3RF22 control. If a fuse is used with a higher rated current than specified, semi- conductor protection is no longer guaranteed. However, smaller fuses with a lower rated current for the load can be used without problems.
Suitable fuse holders, fuse bases and controls can be found in Catalog LV 1, Chapter 19. 1) Type of coordination "2" according to EN 60947-4-1: In the event of a short-circuit, the controls in the load feeder must not endanger persons or the installation. They must be suitable for further operation. For fused configurations, the protective device must be replaced. 2) For use only with operational voltage U e up to 400 V. 3) These fuses have a smaller rated current than the solid-state relays.
21 Siemens · 2009 All-range fuses Semiconductor fuses/partial-range fuses LV HRC design Cylindrical design LV HRC design Cylindrical design gR/SITOR gR/NEOZED2) aR/SITOR aR/SITOR aR/SITOR aR/SITOR 3NE1 SILIZED 5SE1 3NE8 10 mm x 38 mm 3NC1 0 14 mm x 51 mm 3NC1 4 22 mm x 58 mm 3NC2 2 Operational voltage U up to 460 V (+10 %) e 3NE1 814-03) 5SE1 3253) 3NE8 003-1 3NC1 032 3NC1 430 3NC2 232 3NE1 802-03) 5SE1 3503) 3NE8 018-1 -- 3NC1 450 3NC2 263 Operational voltage U up to 600 V (+10 %) e 3NE1 814-03) -- 3NE8 003-1 3NC1 0253) 3NC1 430 3NC2 232 3NE1 803-03) -- 3NE8 018-1 -- 3NC1 4503) 3NC2 2503) Order No.
Cable and line protection fuses LV HRC design3) Cylindrical design3) DIAZED3) gG gG gG gG quick 3NA3 10 mm x 38 mm 3NW6 0 14 mm x 51 mm 3NW6 1 22 mm x 58 mm 3NW6 2 5SB Operational voltage U up to 460 V (+10 %) e 3RF22 30-..... 3RF22 55-..... 3NA3 803-6 -- 3NW6 101-1 3NW6 205-1 5SB1 71 3NA3 807-6 -- -- -- 5SB3 11 Operational voltage U up to 600 V (+10 %) e 3RF22 30-..... 3RF22 55-..... 3NA3 803-6 -- -- -- -- 3NA3 805-6 -- -- -- --