{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4435-2BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4435-2BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4435-2BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4435-2BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4435-2BC44 soft starter, 232 A at 40 °C, 690 V insulation voltage, thyristor-based, screw fixing, 200 x 170 x 270 mm.","salesMarkdown":"## Rated current derating — the 40 °C baseline matters The 3RW4435-2BC44: At 40 °C ambient the unit delivers 232 A continuous — this is the rating to use for BOM sizing in a ventilated panel. If the soft starter sits in a sealed enclosure or near other heat sources, apply the derating curve from the datasheet; the 40 °C figure is not the safe ceiling in a hot cabinet. The insulation voltage is rated 690 V, so the unit comfortably handles 400 V and 480 V line-to-line systems with margin. Operating frequency covers 50 to 60 Hz, making it a single SKU for global line voltages. ## Panel integration — mounting and clearances Mounting is by screw fixing with a vertical mounting surface that can be rotated ±90° or tilted ±22.5° front-to-back. This gives flexibility in panel layout — the unit does not demand a specific orientation beyond vertical. Clearance requirements: 100 mm above, 75 mm below, and 5 mm at the sides. The top clearance is the critical dimension for hot air exhaust and arc-flash containment; the 5 mm side gap is tight but sufficient for a standard panel layout. Dimensions are 200 mm high, 170 mm wide, and 270 mm deep — confirm the backpanel depth and door clearance before committing the cutout. ## Wiring — main and control terminals Main circuit wiring accepts stranded conductors from 25 to 120 mm², finely stranded from 16 to 95 mm², and kcmil 4 to 250. This covers both metric and AWG cable sizes commonly used in North American and European panels. The main current circuit also supports busbar connection, which is typical in distribution-style builds. Auxiliary control terminals accept solid wire 2x (0.25 to 1.5 mm²) or finely stranded 2x (24 to 16 AWG). The busbar clamping points allow up to 2x 1/0 on both sides, or 6 to 2/0 on the front or back clamping point. Maximum motor cable length is 500 m — sufficient for long feeder runs from the MCC to the motor, but verify the cable capacitance does not cause nuisance tripping on the thyristor firing circuit. ## Protection and control features Integrated motor overload protection and intrinsic device protection reduce the need for external overload relays and short-circuit coordination devices. The adjustable current limitation lets you set the starting torque profile — useful for soft-starting conveyors, pumps, and fans where the load inertia varies. The unit supports inside-delta circuit wiring, which reduces the line current drawn during starting by approximately 42% compared to standard in-line connection. This is a common topology for larger motors where the supply transformer has limited capacity. An external reset input allows remote clearing of faults from a PLC or control room pushbutton. The display shows fault codes on the unit itself, so a technician can read the trip cause without a laptop. Minimum load is 8% — below this threshold the thyristor firing may become erratic. If the connected motor draws less than 8% of the soft starter's rated current during start, consider a smaller frame or a bypass contactor. ## Environmental and compliance Pollution degree 3 per IEC 60947-4-2 — rated for industrial environments with conductive dust or occasional condensation. Storage temperature range is -25 to +80 °C; operation is permitted up to 60 °C ambient. The thyristor-based output stage (SCR) provides smooth voltage ramp starting without the mechanical wear of a contactor-based starter. The unit is part of the Siemens SIRIUS family, which shares a common accessory platform across contactors, overloads, and soft starters.","metaTitle":"Siemens 3RW4435-2BC44 SIRIUS Soft Starter, 232 A, 690 V","metaDescription":"Siemens 3RW4435-2BC44 SIRIUS soft starter, 232 A at 40 °C, 690 V insulation, active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4435-2BC44","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 134 A, 75 kW Inside-delta: 232 A, 132 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5535-2HA14<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"16 ... 95 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"4 ... 250 kcmil","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"500m","Derating Temperature":"40°C","Inside-Delta Circuit":"Yes","at 50 Hz rated value":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"232A","at 50 °C rated value":"203A","at 60 °C rated value":"173A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Using Both Clamping Points":"max. 2x 1/0","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"6 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"6 ... 2/0","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"Display","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"spring-loaded terminals","Product Component Motor Brake Output":"Yes","during storage according to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","reference code according to EN 61346-2":"Q","during operation according to IEC 60721":"3K6 (no formation of ice, no 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)","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Evaluation Of Thermistor Motor Protection":"Yes","at standard circuit at 40 °C rated value":"75kW","at standard circuit at 50 °C rated value":"75hp","Finely Stranded Without Core End Processing":"max. 1x 50 mm², 1x 70 mm²","number of CO contacts for auxiliary contacts":"1","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"AC","at inside-delta circuit at 40 °C rated value":"132kW","at inside-delta circuit at 50 °C rated value":"150hp","Control Supply Voltage Frequency 1 Rated Value":"50Hz","Control Supply Voltage Frequency 2 Rated Value":"60Hz","Installation Altitude At Height Above Sea Level":"5 000m","continuous operating current [% of Ie] at 40 °C":"115%","Operating Voltage At Standard Circuit Rated Value":"200 ... 460V","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","Relative Negative Tolerance Of The Operating Frequency":"-10%","Relative Positive Tolerance Of The Operating Frequency":"10%","Relative Negative Tolerance Of The Control Supply Voltage Frequency":"-10%","Relative Positive Tolerance Of The Control Supply Voltage Frequency":"10%","Relative Negative Tolerance Of The Operating Voltage At Standard Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Standard Circuit":"10%","power loss [W] at operational current at 40 °C during operation typical":"76W","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%","Adjustable Motor Current For Motor Overload Protection Minimum Rated Value":"26A","Relative Negative Tolerance Of The Operating Voltage At Inside-Delta Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Inside-Delta Circuit":"10%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5,157.47","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/77cd595e1ec29532cbdcc321bbcf5af1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=312620&mlfb=3RW4435-2BC44"},"ai":{"faq":[{"question":"Where can I buy the 3RW4435-2BC44 and get a price?","answer":"Submit an RFQ for current availability and pricing — lead time and volume breaks are confirmed at quote time."},{"question":"What is the 3RW4435-2BC44's depth?","answer":"The depth is 270 mm. Combined with the 200 mm height and 170 mm width, this unit requires a backpanel depth of at least 270 mm plus clearance for wiring and ventilation."},{"question":"What wire sizes does the 3RW4435-2BC44 accept on the main terminals?","answer":"Main circuit terminals accept stranded 25-120 mm², finely stranded 16-95 mm², and kcmil 4-250. The auxiliary control terminals accept solid 2x (0.25-1.5 mm²) or finely stranded 2x (24-16 AWG)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4435-2BC44","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/3RW4435-2BC44 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}