Solid-State Switching Devices for Resistive Loads Solid-State Relays 3RF21 solid-state relays, single-phase, 22.5 mm 1) I max provides information about the performance of the solid-state relay. The actual permitted rated operational current I e can be smaller depen- ding on the connection method and cooling conditions. Note: The required heat sinks for the corresponding load cur- rents can be determined from the characteristic curves, page 12. The minimum thickness values for the mounting sur- face must be observed. 1) Applies to the version "Low Power" 3RF21 ..-.AA..- 0KN0 . 2) Only for zero-point-switching devices. 10 Siemens · 2009 Order No.
Imax 1) at Rthha/Tu = 40 °C A K/W Imax 1) Ie acc. to IEC 60947-4-3 Ie acc. to UL/CSA Power loss at Imax Minimum load current Leakage current at Rthha/Tu = 40 °C at Rthha/Tu = 40 °C at Rthha/Tu = 50 °C A K/W A K/W W A mA Main circuit 3RF21 20-..... 20 2.0 20 1.7 20 1.3 28.6 0.1 10 3RF21 30-1.... 30 1.1 30 0.79 30 0.56 44.2 0.5 10 3RF21 50-1.... 3RF21 50-2.... 3RF21 50-3.... 50 0.68 50 0.48 50 0.33 66 0.5 10 50 0.68 20 2.6 20 2.9 66 0.5 10 50 0.68 50 0.48 50 0.33 66 0.5 10 3RF21 70-1.... 70 0.40 50 0.77 50 0.6 94 0.5 10 3RF21 90-1.... 3RF21 90-2.... 3RF21 90-3.... 88 0.33 50 0.94 50 0.85 118 0.5 10 88 0.33 20 2.8 20 3.5 118 0.5 10 88 0.33 88 0.22 83 0.19 118 0.5 10 Order No.
Rated impulse withstand capacity Itsm A Rated impulse withstand capacity Itsm I2t value A2s Main circuit 3RF21 20-..... 200 200 3RF21 30-..A.2 3RF21 30-..A.4 3RF21 30-..A.5 3RF21 30-..A.6 300 450 300 450 300 450 400 800 3RF21 50-..... 600 1800 3RF21 70-..A.2 3RF21 70-..A.4 3RF21 70-..A.5 3RF21 70-..A.6 1200 7200 1200 7200 1200 7200 1150 6600 3RF21 90-..... 1150 6600 Type 3RF21 ..-....2 3RF21 ..-....4 3RF21 ..-....5 3RF21 ..-....6 Main circuit Rated operational voltage Ue V 24 ... 230 48 ... 460 48 ... 600 48 ... 600 • Operating range V 20 ... 253 40 ... 506 40 ... 660 40 ... 660 • Rated frequency Hz 50/60 ± 10 % 24 ... 230 48 ... 460 48 ... 600 48 ... 600 20 ... 253 40 ... 506 40 ...
660 40 ... 660 Rated insulation voltage Ui V 600 Blocking voltage V 800 1200 1600 Rage of voltage rise V/µs 1000 Type 3RF21 ..-...0. 3RF21 ..-...1. 3RF21 ..-...2. 3RF21 ..-...4. Control circuit Method of operation DC operation AC/DC operation AC operation DC operation Rated control supply voltage Us V 24 acc. to EN 61131-2 24 AC 24 DC 110 ... 230 4 ... 30 Rated frequency Hz of the control supply voltage -- 50/60 ± 10 % -- 50/60 ± 10 % -- Control supply voltage, max. V 30 26.5 AC 30 DC 253 30 Typical actuating current mA 20 / Low Power: 6.51) 20 20 15 20 Response voltage V 15 14 AC 15 DC 90 4 Drop-out voltage V 5 5 AC 5 DC 40 1 Operating times • ON-delay ms • OFF-delay ms 1 + max.
one half-wave2) 10 + max. one half-wave2) 40 + max. one half-wave2) 1 + max. one half-wave2) 1 + max. one half-wave 15 + max. one half-wave 40 + max. one half-wave 1 + max. one half-wave