{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9977-0UF10","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9977-0UF10","canonicalUrl":"https://aoctrl.com/siemens/3VA9977-0UF10","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9977-0UF10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA9977-0UF10, Maintenance Mode Box MMB300, accessory for 3VA6, 2 relay outputs, 1 digital input, AC-12 6 A / DC-13 0.1 A at 250 V, depth 36 mm, IP20.","salesMarkdown":"The Siemens SENTRON 3VA9977-0UF10 is the Maintenance Mode Box MMB300, a digital input and output module designed as an accessory for the 3VA6 molded-case circuit breaker family. It provides one digital input and two relay outputs for remote signaling and control of the breaker's maintenance mode status. The module mounts in any position and is rated for installation in fixed switchboards inside enclosed rooms, with IP20 protection. ## Digital input and supply The single digital input operates on SELV/PELV per IEC, Class 2 per UL. Signal-1 recognition threshold starts at 15 V and requires 10 mA initial current, scaling to 27 mA full-scale. Signal-0 recognition is below 5 V with a maximum current of 0.2 mA. The module draws a maximum of 0.2 A from the control feed supply, with a rated power loss of 4.8 VA. The supply voltage has a ±20 % relative symmetrical tolerance. ## Dimensions and environment The enclosure measures 36 mm deep, 70 mm wide, and 116 mm high.","metaTitle":"Siemens 3VA9977-0UF10 MMB300 Maintenance Mode Box, 2 Relay Outputs","metaDescription":"Siemens SENTRON 3VA9977-0UF10 MMB300 maintenance mode box. 2 relay outputs, 1 digital input. AC-12 6 A / DC-13 0.1 A at 250 V. Current lifecycle. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"36 mm","Width":"70 mm","title":"3VA9977-0UF10","Height":"116 mm","Maximum":"70 °C","Minimum":"-25 °C","Accessories":"Digital input and output module","description":"Maintenance Mode Box MMB300 incl. connecting cable 1.5 m 3VA - MMB300 accessory for: 3VA6","at AC / maximum":"250 V","at DC / maximum":"250 V","lifecycle_stage":"current","Mounting Position":"any","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Maintenance mode box MMB300","at AC-12 / at 250 V":"6 A","at AC-15 / at 250 V":"3 A","at DC-12 / at 250 V":"0.2 A","at DC-13 / at 250 V":"0.1 A","protection class IP":"20 acc. to IEC60529","Design Of The Product":"Accessory for 3VA6","Number Of Relay Outputs":"2","For Signal <0> / Maximum":"0.2 mA","Number Of Digital Inputs":"1","Suitability For Operation":"Installation in fixed switchboard inside enclosed rooms","Consumed Current / Maximum":"0.2 A","Type Of Electrical Connection":"removable/pluggable","at DC / at 30 V / rated value":"5 A","For Signal <1> / Initial Value":"10 mA","at AC / at 250 V / rated value":"6 A","Digital Input And Output Module":"Yes","Operating Range Of Digital Input":"IEC: SELV/ PELV UL: Class2","power loss [V∙A] / rated value":"4.8 VA","For Signal <1> / Full-Scale Value":"27 mA","Electronic Tripping Unit Power Supply":"Yes","Initial Value For Signal<1>-Recognition":"15 V","Full-Scale Value For Signal<0> Recognition":"5 V","Overvoltage Category / Of The Output Relay":"III (relay) I (other)","Type Of Electrical Connection / At The Inputs For Supply Voltage":"screw-type terminals","Number Of Interfaces / Of The Circuit Breaker Communication System":"1","Relative Symmetrical Tolerance / Of The Operating Range Of The Control Feed Voltage":"20 %","design of DIAZED fuse link / for short-circuit protection of auxiliary contacts of output relay":"D0 6 A 500 V gL/gG"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/854f445e4837f1436702f90bc39043ea.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1049390&mlfb=3VA9977-0UF10"},"ai":{"faq":[{"question":"What are the key ratings for the 3VA9977-0UF10 relay outputs?","answer":"The two relay outputs are rated 6 A at 250 V AC-12 (resistive), 3 A at 250 V AC-15 (inductive), 0.2 A at 250 V DC-12, and 0.1 A at 250 V DC-13. At 30 V DC the rating is 5 A."},{"question":"What is the depth of the 3VA9977-0UF10?","answer":"The depth is 36 mm. The full dimensions are 36 mm deep, 70 mm wide, and 116 mm high."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9977-0UF10","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/3VA9977-0UF10 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}