Solid-State Switching Devices for Switching Motors Solid-State Contactors 3RF24 solid-state reversing contactors, three-phase ■ Overview The integration of four conducting paths to a reverse switch, combined in one enclosure makes this device a particularly compact solution. Compared to conventional systems, for which two contactors are required, it is possible to save up to 50 % width with the three-phase reversing contactors. Devices with 45 mm width cover motors up to 2.2 kW – and those with 90 mm width up to 3 kW.
Due to the integration into the SIRIUS modular system, it is pos- sible to make a connection to a SIRIUS motor starter protector using a link module or with a 3RB20 solid-state overload relay without additional steps. It is possible to mount fuseless or fused motor feeders easily and quickly. ■ Technical specifications 1) These products were built as Class A devices. The use of these devices in residential areas could result in lead in radio interference. In this case these may be required to introduce additional interference suppression measures. 3) 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. 2) To maintain the values, a 3TX7 462-3L surge suppressor (see Catalog LV 1, Chapter 3, page 3/119) should be used between the phases L1 and L3 as close as possible to the switchgear. 61 Siemens · 2009 Order No. 3RF24 ..-1BD.. General data Ambient temperature • During operation, derating from 40 °C °C • During storage °C -25 ... +60 -55 ... +80 Installation altitude m 0 ... 1000; derating over 1000 m upon request Shock resistance acc. to IEC 60068-2-27 g/ms 15/11 Vibration resistance acc.
to IEC 60068-2-6 g 2 Degree of protection IP20 Insulation strength at 50/60 Hz V rms (main/control circuit to floor) 4000 Electromagnetic compatibility (EMC) • Emitted interference acc. to IEC 60947-4-3 - Conducted interference voltage - Emitted, high-frequency interference voltage • 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 61000-4-52) kV Class A for industrial applications1) Class A for industrial applications Contact discharge 4; air discharge 8; behavior criterion 2 0.15 ...
80; 140 dBµV; behavior criterion 1 2/5 kHz; behavior criterion 1 Conductor - ground 2; conductor - conductor 1; behavior criterion 2 Connection type Screw terminals 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 • Stripped length mm • Terminal screw - Tightening torque Nm lb.in 2 x (1.5 ... 2.5)3), 2 x (2.5 ... 6)3) 2 x (1 ... 2.5)3), 2 x (2.5 ... 6)3), 1 x 10 -- 2 x (AWG 14 ... 10) 10 M4 2 ... 2.5 18 ...
22 Connection, auxiliary/control contacts • Conductor cross-section - With/without end sleeve mm AWG • Stripped length mm • Terminal screw - Tightening torque, (∅ 3.5, PZ 1) Nm lb.in 1 x (0.5 ... 2.5), 2 x (0.5 ... 1.0) AWG 20 ... 12 7 M3 0.5 ... 0.6 4.5 ... 5.3 Permissible mounting positions ±10° ±10° NSB0_01703