{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9987-0TA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9987-0TA20","canonicalUrl":"https://aoctrl.com/siemens/3VA9987-0TA20","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9987-0TA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON COM100 breaker data server, 3VA9987-0TA20, PROFIBUS DP + PROFINET IO + Modbus RTU, 90 x 90 x 33.5 mm, IP20.","salesMarkdown":"The Siemens 3VA9987-0TA20 is a SENTRON COM100 breaker data server — the communication gateway for a single 3VA molded-case circuit breaker. It sits in the fixed switchboard inside enclosed rooms (IP20 per IEC 60529) and occupies 5 modular width units on the DIN rail. The 90 x 90 x 33.5 mm footprint fits the standard panel cutout for 3VA accessories. ## Fieldbus and data exchange Three protocol stacks on one module: PROFIBUS DP, PROFINET IO, and Modbus RTU. The Fast Ethernet interface (100 Mbit/s, RJ45) supports auto-MDI(X) and a serial gateway for legacy slaves. Up to 5 active Ethernet connections can be open simultaneously. The Modbus RTU interface uses screw-type terminals for the supply voltage input. Data exchange with the electronic trip unit is bidirectional — the COM100 reads switch position (On, Off, Tripped) and can pull metering values from the breaker's trip unit. The total daisy-chain length for the circuit breaker communication system is 20 m, with 2 bus termination connectors supplied. ## Power budget and mounting Draws 1.1 A maximum from the 24 VDC supply (SELV / PELV, operating resource protection class III per IEC 61558). Power dissipation is 5 W at rated load — factor that into the enclosure thermal budget. Mounting position is any orientation; the removable/pluggable screw-type terminals simplify pre-wiring before the module is snapped onto the DIN rail. The module connects directly to one 3VA breaker via a dedicated interface. An expansion interface is available for additional communication modules. The electronic trip unit power supply is fed through the same connection.","metaTitle":"Siemens 3VA9987-0TA20 SENTRON COM100 Breaker Data Server, PR","metaDescription":"Siemens 3VA9987-0TA20 SENTRON COM100 breaker data server. PROFIBUS DP, PROFINET IO, Modbus RTU. 90 x 90 x 33.5 mm. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"33.5 mm","Width":"90 mm","Height":"90 mm","Maximum":"80 °C","Minimum":"-40 °C","Accessories":"Communication and measurement function","lifecycle_stage":"current","Mounting Position":"any","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"COM100 breaker data server","protection class IP":"20 acc. to IEC60529","Overvoltage Category":"I","PROFIBUS DP protocol":"Yes","PROFINET IO protocol":"Yes","Design Of The Product":"Accessories for 3VA","Suitability For Operation":"Installation in fixed switchboard inside enclosed rooms","Consumed Current / Maximum":"1.1 A","power loss [W] / rated value":"5 W","Number Of Modular Width Units":"5","Type Of Electrical Connection":"removable/pluggable","transfer rate / 2 / for Ethernet":"100 Mbit/s","Communication With Function Module":"Yes","Operating Resource Protection Class":"III according to IEC61558","Electronic Tripping Unit Power Supply":"Yes","at the Ethernet interface / auto-MDI(X)":"Yes","at the Ethernet interface / serial gateway":"Yes","Design Of Cable / Connectable / Twisted Pair":"Yes","Number Of Interfaces / For Expansion Modules":"1","detection of switch position: On, Off, Tripped":"Yes","Data Exchange With The Electronic Tripping Unit":"Yes","Number Of Circuit Breakers / Directly Connectable":"1","number of interfaces / according to Fast Ethernet":"1","at the communication interface / Modbus RTU protocol":"Yes","number of active connections / at the Ethernet interface":"5","Total Length / Of The Circuit Breaker Communication System":"20 m","type of electrical connection / of the fast Ethernet interface":"RJ45","Type Of Electrical Connection / At The Inputs For Supply Voltage":"screw-type terminals","Number Of Interfaces / Of The Circuit Breaker Communication System":"2","Number Of Bus Termination Connectors / On Circuit Breaker Communication System":"2","Relative Symmetrical Tolerance / Of The Operating Range Of The Control Feed Voltage":"20 %"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bee0cfe9182d06cdf61cdcdc8ed311f0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=104462&mlfb=3VA9987-0TA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9987-0TA20/alternatives.json"},"ai":{"faq":[{"question":"What protocols does the COM100 support?","answer":"PROFIBUS DP, PROFINET IO, and Modbus RTU are all native on this module. The Fast Ethernet port runs at 100 Mbit/s with auto-MDI(X)."},{"question":"How do I get current pricing and availability for 3VA9987-0TA20?","answer":"Submit an RFQ through the distributor desk — availability and current pricing are confirmed at quote time against the independent distribution channel."},{"question":"What are the physical dimensions of 3VA9987-0TA20?","answer":"Width 90 mm, height 90 mm, depth 33.5 mm. Occupies 5 modular width units on the DIN rail."},{"question":"Will 3VA9987-0TA20 drop into a panel specified around 6ES7211-1HD30-0XB0 without rewiring?","answer":"No — the 6ES7211-1HD30-0XB0 is a Siemens S7-1200 CPU, a completely different product class. The COM100 is a 3VA breaker accessory with its own DIN-rail footprint and dedicated wiring to the breaker trip unit; it is not a PLC replacement or drop-in."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9987-0TA20","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/3VA9987-0TA20 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}}