{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1SFA895020R7020","brand":"ABB","brandSlug":"abb","productSlug":"1SFA895020R7020","canonicalUrl":"https://aoctrl.com/abb/1SFA895020R7020","factsUrl":"https://aoctrl.com/api/mcp/products/1SFA895020R7020","rawCanonicalId":null},"summary":{"shortDescription":"ABB PSTB1050 softstarter, order code 1SFA895020R7020, 1050 A rated operational current inline, 400...690 V AC, built-in electronic overload protection.","salesMarkdown":"Ramp time is adjustable 0...120 seconds, with initial voltage during start settable 30...70 % and a step-down voltage special ramp of 100...30 %. That range covers soft starts for high-inertia loads like centrifuges or large fans, and the step-down ramp handles pump applications where pressure surge is a concern. Starting capacity is 3xIe for 15 s — enough for most standard squirrel-cage motors on a normal start cycle. Current limit function spans 1.5...7xIe. Control circuit runs on 24 V DC; main control supply accepts 100...250 V AC. ## Signals and integration Three signal relays are built in: run signal, fault signal, and overload signal, plus a by-pass signal relay. That's enough dry contacts to feed a PLC input card for run status, trip alarm, and overload warning without adding an external interface module. A red LED indicates fault; yellow indicates protection active. Communication is via a FiledBusPlug (Standard) — that's ABB's fieldbus adapter interface, meaning you can plug in a PROFIBUS, DeviceNet, or CANopen module depending on the network. The main circuit terminals are bars with a 12.5 mm hole diameter, sized for cable lugs on 1050 A conductors. Control circuit terminals accept rigid 1 x 2.5 mm² with a tightening torque of 0.5 N·m. That's the one you want for a BOM freeze on a new panel design or a replacement for an existing PSTB1050 installation.","metaTitle":"ABB PSTB1050 1SFA895020R7020 Softstarter, 1050 A Inline","metaDescription":"ABB PSTB1050 softstarter, 1SFA895020R7020. 1050 A rated operational current inline, 400-690 V AC, built-in electronic overload. Current lifecycle stage. Quoted 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":"PSTB1050","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 400 ... 690 V AC","Service Factor Percentage":"100 %","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 12.5 mm","Material Compliance/WEEE Category":"4. Large Equipment (Any 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) 560 kW","Rated Operational Power - Inside Delta Connection":"at 400 V 1000 kW","Popular Downloads/Data Sheet, Technical Information":"1SFC132005C0201","Rated Operational Current - In-Line Connection (Ie)":"1050 A","Rated Operational Current - Inside Delta Connection":"1810 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/1sfa895020r7020","alternativesUrl":"https://aoctrl.com/api/mcp/products/1SFA895020R7020/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, with initial voltage during start settable 30...70 % and a step-down voltage special ramp of 100...30 %."},{"question":"What communication interface does the PSTB1050 use?","answer":"It uses a FiledBusPlug (Standard) interface, which accepts ABB's fieldbus adapter modules for PROFIBUS, DeviceNet, CANopen, or other networks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/1SFA895020R7020","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/1SFA895020R7020 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}}