{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1SFA894015R7020","brand":"ABB","brandSlug":"abb","productSlug":"1SFA894015R7020","canonicalUrl":"https://aoctrl.com/abb/1SFA894015R7020","factsUrl":"https://aoctrl.com/api/mcp/products/1SFA894015R7020","rawCanonicalId":null},"summary":{"shortDescription":"ABB PSTB370 softstarter, order code 1SFA894015R7020, 370 A in-line / 640 A inside-delta, 200 kW at 400 V, adjustable ramp 0–120 s, fieldbus plug, electronic overload protection.","salesMarkdown":"The ABB PSTB370 softstarter, order code 1SFA894015R7020, carries two distinct current ratings that govern how you wire it. In-line connection (the standard configuration, with the softstarter in the motor supply) is rated 370 A — that's your go-to figure for sizing the main circuit, the contactor upstream, and the cable. Inside-delta connection, where the softstarter sits inside the motor's delta winding, jumps to 640 A because each phase handles only a portion of the line current. That 640 A figure is not a higher rating for the same wiring — it's a different topology that lets a smaller unit control a larger motor. At 400 V, the corresponding power ratings are 200 kW in-line and 355 kW inside-delta. The adjustable ramp time spans 0 to 120 seconds, so you can dial in the acceleration for any load from a centrifugal pump to a high-inertia conveyor. The initial voltage during start is set between 30% and 70%, and a step-down voltage special ramp from 100% down to 30% is also available for loads that need a soft deceleration. The current limit function lets you cap the inrush between 1.5 and 7 times the set motor current, and the starting capacity is 3x Ie for 15 seconds — enough to break away most loads without tripping. Communication is via a standard FieldBusPlug, meaning you can snap in a PROFIBUS, DeviceNet, or other fieldbus module without extra wiring. The control supply accepts 100–250 V AC, and there's a separate 24 V DC control circuit for the logic. Three signal relays — run, fault, and bypass — give you dry contacts back to the PLC, and an overload signal relay is also present. The built-in electronic overload protection eliminates the need for a separate thermal relay, saving panel space and wiring. Main circuit terminals are bars — expect to bolt your cable lugs directly, not clamp stranded wire. The connecting capacity hole diameter is 10.5 mm, so M8 or 5/16\" bolts fit. Control circuit terminals use a screw clamp with a tightening torque of 0.5 N·m, accepting 1 x 2.5 mm² rigid wire. The supply circuit also takes 1 x 2.5 mm² rigid. The main terminals are rated IP00 per IEC 60529 and IEC 60947-1 — that means no finger protection at the power connections; the unit needs to live inside an enclosure with a door or cover. The ambient operating temperature range is 0 to +50 °C. If your panel runs hotter than that, you'll need to derate or add forced ventilation. The service factor is 115%, giving you a 15% continuous overload margin above the rated current — useful for intermittent duty cycles.","metaTitle":"ABB 1SFA894015R7020 PSTB370 Softstarter, 370 A In-Line, 640","metaDescription":"ABB PSTB370 softstarter, 370 A in-line / 640 A inside-delta, 200 kW at 400 V. Adjustable ramp 0–120 s, fieldbus plug, electronic overload. Active, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Soft Starters"],"specifications":{"Ramp Time":"0 ... 120 second [unit of time]","Communication":"FiledBusPlug(Standard)","Terminal Type":"Main Circuit: Bars","Analog Outputs":"0...10 volts","lifecycle_stage":"current","Run Signal Relay":"Yes","Product Main Type":"PSTB370","Tightening Torque":"Control Circuit 0.5 N·m","Fault Signal Relay":"Yes","Overload Protection":"Build-in electronic overload protection","Rated Frequency (f)":"50/60 Hz","By-pass Signal Relay":"Yes","Degree of Protection":"acc. to IEC 60529, IEC 60947-1, EN 60529 Main Terminals IP00","Overload Signal Relay":"Yes","Current Limit Function":"1.5 ... 7xIe","Ambient Air Temperature":"Operation 0 ... +50 °C","Rated Operational Voltage":"Main Circuit 208 ... 600 V AC","Service Factor Percentage":"115 %","Object Classification Code":"Q","Initial Voltage During Start":"30 ... 70 %","Signal Indication Fault (LED)":"Red","Integrated Electronic Overload":"Yes","Step Down Voltage Special Ramp":"100 ... 30 %","Connecting Capacity Main Circuit":"Hole Diameter 10.5 mm","Material Compliance/WEEE Category":"5. Small Equipment (No External Dimension More Than 50 cm)","Rated Control Supply Voltage (Us)":"100 ... 250 V AC","Connecting Capacity Supply Circuit":"Rigid 1 x 2.5","Material Compliance/WEEE B2C / B2B":"Business To Business","Rated Control Circuit Voltage (Uc)":"DC Operation 24 V","Signal Indication Protection (LED)":"Yellow","Switch for Inside Delta Connection":"Yes","Connecting Capacity Control Circuit":"Rigid 1 x 2.5 mm²","Material Compliance/RoHS Information":"No declaration needed","Popular Downloads/Instructions and Manuals":"1SFC132003M0201","Starting Capacity at Maximum Rated Current Ie":"3xIe for 15s","Rated Operational Power - In-Line Connection (Pe)":"(400 V) 200 kW","Rated Operational Power - Inside Delta Connection":"at 400 V 355 kW","Popular Downloads/Data Sheet, Technical Information":"1SFC132005C0201","Rated Operational Current - In-Line Connection (Ie)":"370 A","Rated Operational Current - Inside Delta Connection":"640 A","Material Compliance/Conflict Minerals Reporting Template (CMRT)":"9AKK108467A5658"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.abb.com/global/en/products/1sfa894015r7020","alternativesUrl":"https://aoctrl.com/api/mcp/products/1SFA894015R7020/alternatives.json"},"ai":{"faq":[{"question":"What is the ramp time range on this softstarter?","answer":"The ramp time is adjustable from 0 to 120 seconds, letting you match acceleration to the load — from a quick start on a pump to a slow ramp on a high-inertia conveyor."},{"question":"What communication interface does this softstarter use?","answer":"It uses a standard FieldBusPlug, so you can plug in a PROFIBUS, DeviceNet, or other fieldbus module directly — no separate wiring or adapter needed."},{"question":"Where can I buy 1SFA894015R7020 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time and price."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/1SFA894015R7020","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/1SFA894015R7020 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}