Solid-State Switching Devices for Resistive Loads Solid-State Relays 3RF21 solid-state relays, single-phase, 22.5 mm Fused version with semiconductor protection (similar to type of coordination "2") 1) The semiconductor protection for the SIRIUS controls can be used with different protective devices. This allows protection by means of LV HRC fuses of gG operational class or miniature cir- cuit breakers. Siemens recommends the use of special SITOR semiconductor fuses. The table below lists the maximum per- missible fuses for each SIRIUS 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. For protective devices with gG operational class and for SITOR 3NE1 all-range fuses, the minimum cross-sections for the con- ductor to be connected must be taken into account. 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) For use only with operational voltage U e up to 506 V. 4) These fuses have a smaller rated current than the solid-state relays. 5) These versions can also be protected against short-circuits with miniature circuit breakers as described in the notes on "SIRIUS Solid-State Contactors → Special Version Short-Circuit Resistant". 11 Siemens · 2009 Order No.
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 3RF21 20-...2 3RF21 20-...4 3RF21 20-....53) 3NE1 814-0 5SE1 325 3NE8 015-1 3NC1 020 3NC1 420 3NC2 220 3NE1 813-04) 5SE1 320 3NE8 015-1 3NC1 0164) 3NC1 420 3NC2 220 3NE1 813-04) 5SE1 320 3NE8 015-1 3NC1 0164) 3NC1 420 3NC2 220 3RF21 30-...2 3RF21 30-...4 3RF21 30-....53) 3RF21 30-...6 3NE1 815-04) 5SE1 335 3NE8 003-1 3NC1 032 3NC1 432 3NC2 232 3NE1 815-04) 5SE1 3254) 3NE8 003-1 3NC1 0254) 3NC1 430 3NC2 232 3NE1 815-04) 5SE1 3254) 3NE8 003-1 3NC1 0254) 3NC1 430 3NC2 232 3NE1 815-04) -- 3NE8 003-1 3NC1 032 3NC1 432 3NC2 232 3RF21 50-...2 3RF21 50-...4 3RF21 50-....53) 3RF21 50-...6 3NE1 817-0 5SE1 350 3NE8 017-1 -- 3NC1 450 3NC2 250 3NE1 802-04) 5SE1 3354) 3NE8 017-1 -- 3NC1 450 3NC2 250 3NE1 802-04) 5SE1 3354) 3NE8 017-1 -- 3NC1 450 3NC2 250 3NE1 803-04) -- 3NE8 017-1 -- 3NC1 450 3NC2 250 3RF21 70-...25) 3RF21 70-...45) 3RF21 70-....53)5) 3RF21 70-...65) 3NE1 820-0 5SE1 3634) 3NE8 020-1 -- -- 3NC2 280 3NE1 020-2 5SE1 3634) 3NE8 020-1 -- -- 3NC2 280 3NE1 020-2 -- 3NE8 020-1 -- -- 3NC2 280 3NE1 020-2 -- 3NE8 020-1 -- -- 3NC2 280 3RF21 90-...25) 3RF21 90-...45) 3RF21 90-....53)5) 3RF21 90-...65) 3NE1 021-2 -- 3NE8 021-1 -- -- 3NC2 200 3NE1 021-2 -- 3NE8 021-1 -- -- 3NC2 2804) 3NE1 021-2 -- 3NE8 021-1 -- -- 3NC2 2804) 3NE1 817-04) -- 3NE8 021-1 -- -- 3NC2 2804) Order No.
Cable and line protection fuses LV HRC design4) Cylindrical design4) DIAZED4) gG gG gG gG quick 3NA2 10 mm x 38 mm 3NW6 0 14 mm x 51 mm 3NW6 1 22 mm x 58 mm 3NW6 2 5SB 3RF21 20-...2 3RF21 20-...4 3RF21 20-....53) 3NA2 803 3NW6 000-1 3NW6 101-1 -- 5SB1 41 3NA2 801 -- 3NW6 101-1 -- 5SB1 41 3NA2 801 -- 3NW6 101-1 -- 5SB1 41 3RF21 30-...2 3RF21 30-...4 3RF21 30-....53) 3RF21 30-...6 3NA2 803 -- 3NW6 103-1 -- 5SB1 71 3NA2 803 -- 3NW6 101-1 -- 5SB1 71 3NA2 803 -- 3NW6 101-1 -- 5SB1 71 3NA2 803-6 -- -- -- -- 3RF21 50-...2 3RF21 50-...4 3RF21 50-....53) 3RF21 50-...6 3NA2 810 -- 3NW6 107-1 3NW6 207-1 5SB3 11 3NA2 807 -- -- 3NW6 205-1 5SB3 11 3NA2 807 -- -- 3NW6 205-1 5SB3 11 3NA2 807-6 -- -- -- -- 3RF21 70-...25) 3RF21 70-...45) 3RF21 70-....53)5) 3RF21 70-...65) 3NA2 817 -- -- 3NW6 217-1 5SB3 31 3NA2 812 -- -- 3NW6 212-1 5SB3 31 3NA2 812 -- -- 3NW6 212-1 -- 3NA2 812-6 -- -- -- -- 3RF21 90-...25) 3RF21 90-...45) 3RF21 90-....53)5) 3RF21 90-...65) 3NA2 817 -- -- 3NW6 217-1 -- 3NA2 812 -- -- 3NW6 212-1 -- 3NA2 812 -- -- 3NW6 212-1 -- 3NA2 812-6 -- -- -- --