Controls – Solid-State Switching Devices Introduction ■ Overview 3RF21 3RF20 3RF22 3RF23 3RF24 3RF24 (Motor) 3RF29 22.5 mm solid-state relays, 45 mm solid-state relays • Widths of 22.5 mm and 45 mm • Compact and space-saving design 3RF21, 3RF20 9 15 • "Zero-point switching" version • Mounting onto existing heat sinks 3RF22 19 Solid-state contactors • Complete units comprising a solid-state relay and an optimized heat sink, "ready to use" 3RF23 26 • Compact and space-saving design 3RF24 35 • Versions for resistive loads "zero-point switching" and inductive loads "instantaneous switching" • Special versions "Low noise" and "Short-circuit resistant" Converters • For converting an analog input signal into an on/off ratio; can also be used on 3RF22 and 3RF24 three-phase switching devices 3RF29 00-0EA18 46 3RF29 20-0FA08, 3RF29 .0-0GA..
47 Heating current monitoring • For load monitoring of one or more loads (partial loads); remote teach 3RF29 ..-0JA.. 48 3RF29 ..-0KA. 49 Power regulators • For supplying the current by means of a solid-state switching device depending on a setpoint value. Closed-loop control: full-wave control or generalized phase control 3RF29 .0-0HA.. 50 Solid-state contactors, solid-state reversing contactors • Complete units comprising in the insulated enclosure with integrated heat sink, "ready to use" 3RF24 55 • Compact and space-saving design • Version for motors, "instantaneous switching" 4 Siemens · 2009 Order No.
Page SIRIUS solid-state switching devices for switching resistive loads Solid-state relays Solid-state contactors Function modules For extending the functionality of the 3RF21 solid-state relays and the 3RF23 solid-state contactors for many different applications: Load monitoring • For load monitoring of one or more loads (partial loads) Power controllers • For supplying the current by means of a solid-state switching device depending on a setpoint value. There is a choice of full-wave control and generalized phase control. SIRIUS solid-state switching devices for switching motors Solid-state contactors