{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9977-0TA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9977-0TA10","canonicalUrl":"https://aoctrl.com/siemens/3VA9977-0TA10","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9977-0TA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON COM800 breaker data server, 3VA9977-0TA10, PROFINET IO & PROFIBUS DP, 100 Mbit/s Ethernet, connects up to 8 3VA circuit breakers, 90 x 90 x 33.5 mm, IP20.","salesMarkdown":"## What the COM800 does on a 3VA panel The Siemens 3VA9977-0TA10 is the SENTRON COM800 breaker data server — a communication gateway that sits on the DIN rail inside a fixed switchboard and pulls data from up to eight 3VA circuit breakers via the electronic trip unit interface. It speaks PROFINET IO and PROFIBUS DP simultaneously, plus a Modbus RTU serial gateway on the Ethernet port, so the panel can report breaker status (on, off, tripped), current draw, and power metrics to a PLC or SCADA without separate protocol converters. The 100 Mbit/s Fast Ethernet interface uses an RJ45 connector with auto-MDI(X) for straight or crossover cables, and supports up to five active connections. ## Mounting and integration constraints The module occupies 5 modular width units on the DIN rail — 90 mm wide, 90 mm tall, 33.5 mm deep — and can be mounted in any orientation. Power comes from a 24 VDC supply via screw terminals; the unit draws 1.1 A max and dissipates 5 W. It also supplies the electronic trip units on connected breakers, so the control transformer needs to cover that additional load. The total daisy-chain length between breakers is limited to 20 m, with two bus termination connectors included. IP20 rating means it is for enclosed panels only — no washdown exposure.","metaTitle":"Siemens 3VA9977-0TA10 SENTRON COM800 Breaker Data Server, PR","metaDescription":"Siemens 3VA9977-0TA10 SENTRON COM800 breaker data server. PROFINET IO & PROFIBUS DP. Connects up to 8 3VA breakers. 90 x 90 x 33.5 mm. IP20. Current lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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":"COM800 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":"8","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650497&mlfb=3VA9977-0TA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9977-0TA10/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3VA9977-0TA10?","answer":"The depth is 33.5 mm, with a width of 90 mm and height of 90 mm, occupying 5 modular width units on the DIN rail."},{"question":"Where can I buy 3VA9977-0TA10?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What protocols does the COM800 support?","answer":"It supports PROFINET IO, PROFIBUS DP, and Modbus RTU (via the Ethernet serial gateway), with a 100 Mbit/s Fast Ethernet interface."},{"question":"How many 3VA breakers can one COM800 connect to?","answer":"Up to eight 3VA circuit breakers can be directly connected to a single COM800, with a total bus length of 20 m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9977-0TA10","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/3VA9977-0TA10 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}}