Solid-State Switching Devices for Resistive Loads Solid-State Relays 3RF21 solid-state relays, single-phase, 22.5 mm ■ Overview 22.5 mm solid-state relays With its compact design, which stays the same even at currents of up to 88 A, the 3RF21 solid-state relay is the ultimate in space- saving construction, at a width of 22.5 mm. The logical connec- tion method, with the power infeed from above and load connec- tion from below, ensures tidy installation in the control cabinet. ■ Technical specifications 1) If two different conductor cross-sections are connected to one clamping point, both cross-sections must lie in the range specified.
If identical cross-sections are used, this restriction does not apply. 9 Siemens · 2009 Type 3RF21 ..-1.... 3RF21 ..-2.... 3RF21 ..-3.... General data Ambient temperature • During operation, derating from 40 °C °C • During storage °C -25 ... + 60 -55 ... + 80 Installation altitude m 0 ... 1000; derating from 1000 Shock resistance acc. to g/ms IEC 60068-2-27 15/11 Vibration resistance acc. to g IEC 60068-2-6 2 Degree of protection IP20 Electromagnetic compatibility (EMC) • Emitted interference - Conducted interference voltage acc. to IEC 60947-4-3 - Emitted, high-frequency interference voltage acc. to IEC 60947-4-3 • Interference immunity - Electrostatic discharge kV acc.
to IEC 61000-4-2 (corresponds to degree of severity 3) - Induced RF fields MHz acc. to IEC 61000-4-6 - Burst acc. to IEC 61000-4-4 kV - Surge acc. to IEC 61000-4-5 kV Class A for industrial applications Class A for industrial applications Contact discharge 4; air discharge 8; behavior criterion 2 0.15 ...
80; 140 dBµV; behavior criterion 1 2/5.0 kHz; behavior criterion 1 Conductor - ground 2; conductor - conductor 1; behavior criterion 2 Connection type Screw terminals Spring-type terminals Ring terminal lug Connection, main contacts • Conductor cross-section - Solid mm2 - Finely stranded with end sleeve mm2 - Finely stranded without end sleeve mm2 - Solid or stranded, AWG cables • Terminal screw • Tightening torque Nm lb.in • Cable lug - DIN - JIS connections 2 x (1.5 ... 2.5)1), 2 x (2.5 ... 6)1) 2 x (0.5 ... 2.5) -- 2 x (1 ... 2.5)1), 2 x (2.5 ... 6)1), 1 x 10 2 x (0.5 ... 1.5) -- - 2 x (0.5 ... 2.5) -- 2 x (AWG 14 ... 10) 2 x (AWG 18 ... 14) -- M4 -- M5 2 ... 2.5 -- 2.5 ... 2 7 ...
10.3 -- 10.3 ... 7 -- -- DIN 46234 -5-2.5, -5-6, -5-10, -5-16, -5-25 -- -- JIS C 2805 R 2-5, 5.5-5, 8-5, 14-5 Connection, auxiliary/control contacts • Conductor cross-section mm AWG • Stripped length mm • Terminal screw • Tightening torque Nm lb.in 1 x (0.5 ... 2.5), 2 x (0.5 ... 1.0) 20 ... 12 0.5 ... 2.5 20 ... 12 1 x (0.5 ... 2.5), 2 x (0.5 ... 1.0) 20 ... 12 7 10 7 M3 -- M3 0.5 ... 0.6 -- 0.5 ... 0.6 4.5 ... 5.3 -- 4.5 ... 5.3