© Siemens AG 2010 Controls — Soft Starters and Solid-State Switching Devices Introduction 3RF21 3RF20 3RF22 3RF23 3RF24 3RF24 (Motor) 3RF29 Solid-State Relays 4 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) 3RF29 ..-0FA08, 3RF29 .0-0GA.. 4/69 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. 3RF29 ..-0KA.
4/71 Solid-State Contactors 4/3 Siemens LV 1 · 2010 Order No.
Page SIRIUS solid-state switching devices for switching resistive loads 22.5 mm solid-state relays, 45 mm solid-state relays • Widths of 22.5 mm and 45 mm • Compact and space-saving design • "Zero-point switching" version • Mounting onto existing heat sinks 3RF21, 3RF20 3RF22 4/49 4/52 4/53 Solid-state contactors • Complete units comprising a solid-state relay and an optimized heat sink, "ready to use" • Compact and space-saving design • Versions for resistive loads "zero-point switching" and inductive loads "instantaneous switching" • Special versions "Low Noise" and "Short-Circuit Proof" 3RF23 3RF24 4/55 4/61 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 4/68 Heating current monitoring • For load monitoring of one or more loads (partial loads); remote teach 3RF29 ..-0JA..
4/70 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.. 4/72 SIRIUS solid-state switching devices for switching motors Solid-state contactors, solid-state reversing contactors • Complete units in the insulated enclosure with integrated heat sink, "ready to use" • Compact and space-saving design • Version for motors, "instantaneous switching" 3RF24 4/76