{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW5521-1HA16","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW5521-1HA16","canonicalUrl":"https://aoctrl.com/siemens/3RW5521-1HA16","factsUrl":"https://aoctrl.com/api/mcp/products/3RW5521-1HA16","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RW5521-1HA16 soft starter, 200-690 V, ATEX certified, Class 10A/10E/20E/30E trip, PROFIBUS/Modbus/EtherNet/IP, 185 x 306 x 203 mm.","salesMarkdown":"## ATEX-rated motor starting for hazardous zones This Siemens 3RW5521-1HA16 soft starter carries ATEX and IECEx certification, meaning it can be specified for motor starting in potentially explosive atmospheres without an additional isolation barrier. The ATEX marking covers gas and dust groups per the ATEX directive; the IECEx listing provides the global equivalent for jurisdictions that follow the IECEx scheme. The wide voltage window means one part number can be stocked for multi-voltage plants. ## Trip class and motor protection coordination The trip class is selectable from CLASS 10A / 10E (default) / 20E / 30E per IEC 60947-4-2. Class 10A is the standard for standard-start applications; Class 20E or 30E accommodates high-inertia loads like centrifuges or crushers where the start time exceeds 10 seconds. The selector is parameterized via the onboard interface. Built-in motor heating and DC braking allow the soft starter to handle both start and stop control without external contactors for the braking function. The voltage ramp and pump ramp down reduce mechanical shock on the load and piping. Accuracy Class 5 per IEC 61557-12 applies to the integrated current measurement — sufficient for motor protection without a separate CT. The service factor of 1.15 means the starter can run the motor at 115% of rated current continuously without tripping, matching typical NEMA motor service factors. ## Fieldbus and control integration The 3RW5521-1HA16 supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP natively — no separate communication module required for these protocols. PROFINET with PROFIenergy is available via an optional communication module. This multi-protocol capability lets the starter drop into existing plant networks without a gateway. Analog output configurable as 4-20 mA or 0-10 V provides a real-time motor current signal to a PLC or SCADA. The event list and error logbook store the last several fault events with timestamps, useful for diagnosing intermittent trips without a continuous connection. Firmware update capability via the fieldbus interface means the starter can be upgraded in the field without replacing hardware. Four parameter sets allow quick changeover between different motor configurations or process recipes. ## Mounting and clearance for panel layout The unit measures 185 mm wide, 306 mm high, and 203 mm deep. Required clearances: 100 mm above, 75 mm below, 10 mm in front, 5 mm at the sides, and 0 mm behind. The zero rear clearance means it can be mounted flush against a back panel, saving depth in shallow enclosures. Screw terminals are standard for power and control wiring — no special crimp tooling needed. The terminal layout follows Siemens SIRIUS standard spacing, compatible with common busbar systems and feeder terminals. ## Compliance and approvals for global shipments CE marking covers the EU low-voltage and EMC directives. UL approval and CSA approval cover North American installations. ATEX and IECEx cover hazardous locations. This combination of approvals means the starter can be shipped to most industrial markets without additional certification work.","metaTitle":"Siemens 3RW5521-1HA16 Soft Starter, 200-690V, ATEX, Active","metaDescription":"Siemens 3RW5521-1HA16 soft starter, 200-690 V, ATEX certified, Class 10A/10E/20E/30E trip. Active production, UL/CSA/CE. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"ATEX":"Yes","Depth":"203 mm","IECEx":"Yes","Width":"185 mm","title":"3RW5521-1HA16","Height":"306 mm","Upwards":"100 mm","Forwards":"10 mm","PROFIBUS":"Yes","at 50 Hz":"110 ... 250 V","at 60 Hz":"110 ... 250 V","Backwards":"0 mm","Downwards":"75 mm","CE marking":"Yes","DC braking":"Yes","Event List":"Yes","Modbus RTU":"Yes","Modbus TCP":"Yes","Trip Class":"CLASS 10A / 10E (default) / 20E / 30E; acc. to IEC 60947-4-2","auto-RESET":"Yes","At The Side":"5 mm","EtherNet/IP":"Yes","PROFIenergy":"Yes; in connection with the PROFINET Standard and PROFINET High-Feature communication modules","Rated Value":"200 ... 690 V","UL approval":"Yes","description":"SIRIUS soft starter 200-690 V 25 A, 110-250 V AC Screw terminals","CSA approval":"Yes","Remote Reset":"Yes","Voltage Ramp":"Yes","Analog Output":"Yes; 4 ... 20 mA (default) / 0 ... 10 V","Error Logbook":"Yes","Motor Heating":"Yes","Accuracy Class":"5 (based on IEC 61557-12)","Pump Ramp Down":"Yes","Screw Terminal":"Yes","Service Factor":"1.15","Torque Control":"Yes","Trace Function":"Yes","Breakaway Pulse":"Yes","Firmware Update":"Yes","Parameterizable":"4","lifecycle_stage":"current","Combined Braking":"Yes","During Operation":"-25 ... +60 °C; Please observe derating at temperatures of 40 °C or above","Fastening Method":"screw fixing","HMI-High Feature":"Yes","Minimum Load [%]":"10 %; Relative to set Ie","Product Category":"Hybrid switching devices","Shock Resistance":"15 g / 11 ms, from 6 g / 11 ms with potential contact lifting","Start Torque [%]":"10 ... 100 %","Mounting Position":"Vertical (can be rotated +/- 90° and tilted forward or backward +/- 22.5°)","PROFINET standard":"Yes","Product Brand Name":"SIRIUS","Application Wizards":"Yes","Degree Of Pollution":"3, acc. to IEC 60947-4-2","For Control Circuit":"screw-type terminals","Product Designation":"Soft starter","Reversing Operation":"Yes","Stopping Torque [%]":"10 ... 100 %","Alternative Run-Down":"Yes","Condition Monitoring":"Yes","Idle Time Adjustable":"0 ... 255 s","Inside-Delta Circuit":"Yes; Only up to 600 V operating voltage","Starting Voltage [%]":"20 ... 100 %","Stopping Voltage [%]":"50 %; non-adjustable","Vibration Resistance":"15 mm up to 6 Hz; 2 g up to 500 Hz","PROFINET high-feature":"Yes","Ramp-Down (Soft Stop)":"Yes","Torque Limitation [%]":"20 ... 200 %","at 40 °C rated value":"43.3 A","at 50 °C rated value":"39 A","at 60 °C rated value":"33.9 A","Communication Function":"Yes","Digital Output Version":"3 normally-open contacts (NO) / 1 changeover contact (CO)","Slave Pointer Function":"Yes","Spring-Loaded Terminal":"No","Ramp-Up (Soft Starting)":"Yes","at 40 °C after startup":"8 W","at 50 °C after startup":"7 W","at 60 °C after startup":"6 W","EMC emitted interference":"acc. to IEC 60947-4-2: Class A, Class B on request","Emergency Operation Mode":"Yes","For Main Current Circuit":"box terminal","Number Of Analog Outputs":"1","Number Of Digital Inputs":"4","Number Of Parameter Sets":"3","Weight Without Packaging":"5.5 kg","at 40 °C during startup":"332 W","at 50 °C during startup":"283 W","at 60 °C during startup":"239 W","Breakaway Time Adjustable":"0 ... 2 s","For Control Circuit Solid":"1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)","Motor Overload Protection":"Yes; Full motor protection (thermistor motor protection and electronic motor overload protection)","Number Of Digital Outputs":"4","Via Software Configurable":"Yes","Automatic Parameterisation":"Yes","Impulse Voltage Rated Value":"8 kV","Intrinsic Device Protection":"Yes","Number Of Controlled Phases":"3","During Storage And Transport":"-40 ... +80 °C","Type Of The Motor Protection":"Electronic, tripping in the event of thermal overload of the motor","Via Software Parameterizable":"Yes","at DC-13 at 24 V rated value":"1 A","Adjustable Current Limitation":"Yes","Electromagnetic Compatibility":"acc. to IEC 60947-4-2","Substance Prohibitance (Date)":"02/15/2018","at 40 °C rated value minimum":"5 A","at AC-15 at 250 V rated value":"3 A","is supported HMI-High Feature":"Yes","Insulation Voltage Rated Value":"690 V","Ramp-Down Time Of Soft Starter":"0 ... 360 s","at 230 V at 40 °C rated value":"5.5 kW","at 400 V at 40 °C rated value":"11 kW","at 500 V at 40 °C rated value":"15 kW","at 690 V at 40 °C rated value":"22 kW","Width Of Connection Bar Maximum":"25 mm","Breakaway Voltage [%] Adjustable":"40 ... 100 %","Control Supply Voltage Frequency":"50 ... 60 Hz","Operating Measured Value Display":"Yes","Operating frequency 1 rated value":"50 Hz","Operating frequency 2 rated value":"60 Hz","of high feature HMI module usable":"3RW5980-0HF00","of the gG fuse usable up to 690 V":"3NA3824-6; Type of coordination 1, Iq = 65 kA","Between Main And Auxiliary Circuit":"690 V; does not apply for thermistor connection","Start-Up Ramp Time Of Soft Starter":"0 ... 360 s","at 200/208 V at 50 °C rated value":"5 hp","at 220/230 V at 50 °C rated value":"7.5 hp","at 460/480 V at 50 °C rated value":"15 hp","at 575/600 V at 50 °C rated value":"20 hp","At Inside-Delta Circuit Rated Value":"200 ... 600 V","Programmable Control Inputs/Outputs":"Yes","at the digital inputs at DC maximum":"1 000 m","of communication module Ethernet/IP":"3RW5980-0CE00","Current Unbalance Limiting Value [%]":"10 ... 60 %","Design Of The Overvoltage Protection":"Varistor","Surge Voltage Resistance Rated Value":"8 kV","Current Limiting Value [%] Adjustable":"125 ... 800 %","during storage according to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","Between Soft Starter And Motor Maximum":"800 m","Removable Terminal For Control Circuit":"Yes","according to ATEX directive 2014/34/EU":"BVS 18 ATEX F 003 X","at AWG cables for control circuit solid":"1x (20 ... 12), 2x (20 ... 14)","during operation according to IEC 60721":"3K6 (no ice formation, only occasional condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6","during transport according to IEC 60721":"2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)","of communication module PROFIBUS usable":"3RW5980-0CP00","reference code according to IEC 81346-2":"Q","Blocking Voltage Of The Thyristor Maximum":"1 800 V","Evaluation Of Thermistor Motor Protection":"Yes; Type A PTC or Klixon / Thermoclick","Number Of Digital Outputs Parameterizable":"3","of communication module Modbus RTU usable":"3RW5980-0CR00","of communication module Modbus TCP usable":"3RW5980-0CT00","Creep Speed In Both Directions Of Rotation":"Yes","Ground-Fault Monitoring Limiting Value [%]":"10 ... 95 %","Soft Starting At Heavy Starting Conditions":"Yes","For Main Contacts With Screw-Type Terminals":"40 ... 53 lbf·in","Recovery Time After Overload Trip Adjustable":"60 ... 1 800 s","Number Of Digital Outputs Not Parameterizable":"1","Type Of Voltage Of The Control Supply Voltage":"AC","With Conductor Cross-Section = 0.5 Mm2 Maximum":"50 m","With Conductor Cross-Section = 1.5 Mm2 Maximum":"150 m","With Conductor Cross-Section = 2.5 Mm2 Maximum":"250 m","Holding Current In Bypass Operation Rated Value":"180 mA","utilization category according to IEC 60947-4-2":"AC 53a","Product Feature Integrated Bypass Contact System":"Yes","of communication module PROFINET standard usable":"3RW5980-0CS00","Control Supply Current In Standby Mode Rated Value":"100 mA","Relative Negative Tolerance Of The Operating Voltage":"-15 %","Relative Positive Tolerance Of The Operating Voltage":"10 %","contact rating of auxiliary contacts according to UL":"R300-B300","of communication module PROFINET high-feature usable":"3RW5950-0CH00","Inrush Current By Closing The Bypass Contacts Maximum":"0.8 A","Design Of Short-Circuit Protection For Control Circuit":"4 A gG fuse (Icu=1 kA), 6 A quick-acting fuse (Icu=1 kA), C1 miniature circuit breaker (Icu= 600 A), C6 miniature circuit breaker (Icu= 300 A); Is not part of scope of supply","Relative Negative Tolerance Of The Operating Frequency":"-10 %","Relative Positive Tolerance Of The Operating Frequency":"10 %","Installation Altitude At Height Above Sea Level Maximum":"2 000 m; Derating as of 1000 m, see catalog","of the gG fuse usable at inside-delta circuit up to 500 V":"3NA3824-6; Type of coordination 1, Iq = 65 kA","For Auxiliary And Control Contacts With Screw-Type Terminals":"7 ... 10.3 lbf·in","For Control Circuit Finely Stranded With Core End Processing":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)","For Main Contacts For Box Terminal Using Both Clamping Points Solid":"2x (2.5 ... 16 mm²)","Relative Negative Tolerance Of The Control Supply Voltage Frequency":"-10 %","Relative Positive Tolerance Of The Control Supply Voltage Frequency":"10 %","Inrush Current Peak At Application Of Control Supply Voltage Maximum":"43 A","For Main Contacts For Box Terminal Using Both Clamping Points Stranded":"2x (6 ... 16 mm²), 2x (10 ... 50 mm²)","For Main Contacts For Box Terminal Using The Back Clamping Point Solid":"1x (2.5 ... 16 mm²)","of back-up R fuse link for semiconductor protection usable up to 690 V":"3NE8021-1; Type of coordination 2, Iq = 65 kA","For Main Contacts For Box Terminal Using The Front Clamping Point Solid":"1x (2.5 ... 16 mm²)","Duration Of Inrush Current Peak At Application Of Control Supply Voltage":"1.6 ms","relative negative tolerance of the control supply voltage at AC at 50 Hz":"-15 %","relative negative tolerance of the control supply voltage at AC at 60 Hz":"-15 %","relative positive tolerance of the control supply voltage at AC at 50 Hz":"10 %","relative positive tolerance of the control supply voltage at AC at 60 Hz":"10 %","For Main Contacts For Box Terminal Using The Back Clamping Point Stranded":"1x (10 ... 70 mm²)","of full range R fuse link for semiconductor protection usable up to 690 V":"3NE1817-0; Type of coordination 2, Iq = 65 kA","For Main Contacts For Box Terminal Using The Front Clamping Point Stranded":"1x (10 ... 70 mm²)","Relative Negative Tolerance Of The Operating Voltage At Inside-Delta Circuit":"-15 %","Relative Positive Tolerance Of The Operating Voltage At Inside-Delta Circuit":"10 %","at AWG cables for main contacts for box terminal using the back clamping point":"1x (10 ... 2/0)","For Main Contacts For Box Terminal Using Both Clamping Points Finely Stranded With Core End Processing":"2x (2.5 ... 35 mm²)","For Main Contacts For Box Terminal Using The Back Clamping Point Finely Stranded With Core End Processing":"1x (2.5 ... 50 mm²)","For Main Contacts For Box Terminal Using The Front Clamping Point Finely Stranded With Core End Processing":"1x (2.5 ... 50 mm²)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/32116f1689c3113a117ad7ef6b50819e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=831009&mlfb=3RW5521-1HA16"},"ai":{"faq":[{"question":"What ATEX certification does the 3RW5521-1HA16 carry?","answer":"The soft starter is ATEX certified and also carries IECEx certification. This covers use in potentially explosive atmospheres per the ATEX directive and the IECEx scheme. The specific gas/dust group and temperature class should be verified against the nameplate for the exact installation zone."},{"question":"What are the panel clearance requirements for the 3RW5521-1HA16?","answer":"Required clearances: 100 mm above, 75 mm below, 10 mm in front, 5 mm at the sides, and 0 mm behind. The zero rear clearance allows flush mounting against the back panel. Overall dimensions are 185 mm wide x 306 mm high x 203 mm deep."},{"question":"What fieldbus protocols does the 3RW5521-1HA16 support natively?","answer":"The starter supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP without additional communication modules. PROFINET with PROFIenergy requires an optional communication module. The analog output can be configured as 4-20 mA or 0-10 V for direct PLC connection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW5521-1HA16","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RW5521-1HA16 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}