{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N21491","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N21491","canonicalUrl":"https://aoctrl.com/schneider/A9N21491","factsUrl":"https://aoctrl.com/api/mcp/products/A9N21491","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Prodis range, Vigi TG40 add-on residual current device, 3P+N, 25 A rated current, 300 mA sensitivity, Type AC, clip-on DIN rail mount.","salesMarkdown":"The 25 A rated current (In) sets the maximum continuous load the RCD can carry — sized for a group incomer feeding several downstream branch circuits, not a single heavy load. The 300 mA sensitivity is a common choice for protection against fire risk from earth faults rather than personnel shock protection (which typically requires 30 mA or lower). Type AC means it detects only sinusoidal AC residual currents; if your installation includes non-linear loads (VFDs, switched-mode supplies) that can generate pulsed DC fault currents, you would need a Type A or Type B device instead. The voltage-independent tripping mechanism is a plus for reliability: the RCD will still trip on a residual fault even if the phase-to-neutral voltage collapses. Clip-on mounting to DIN rail — it snaps onto the rail alongside the associated MCB and connects electrically via screws. The 3P+N configuration with neutral on the left means it occupies 6 module pitches of 9 mm each, so plan for 54 mm of DIN-rail width. Rated insulation voltage is 400 V AC phase-to-phase at 50 Hz, with an impulse withstand voltage of 6 kV, so it is suited for standard 400/230 V distribution panels.","metaTitle":"Schneider Electric A9N21491 Vigi TG40 RCD, 25A 300mA 3P+N","metaDescription":"Obsolete Schneider Electric A9N21491 Vigi TG40 add-on RCD, 25A, 300mA, Type AC, 3P+N. Sourced to order against RFQ. IEC 60947-2, EN 61009-1.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Range":"Prodis","Width":"54 mm","Colour":"White","Height":"82 mm","Standards":"IEC 60947-2 EN 61009-1 EN 61009-2-1","9 Mm Pitches":"6","Network type":"AC","Mounting mode":"Clip-on","Tropicalisation":"2 conforming to IEC 60068-1","lifecycle_stage":"current","Local signalling":"ON/OFF indication","Mounting support":"DIN rail","Neutral position":"Left","Pollution degree":"3 conforming to EN 61009-1","Device short name":"Vigi TG40","Network frequency":"50 Hz","Poles description":"3P + N","Relative humidity":"95 % at 55 °C","Tightening torque":"2 N.m","Operating altitude":"2000 m","[In] rated current":"25 A","Wire stripping length":"13 mm","Connections - terminals":"Cable upstream 0.75...16 mm² rigid Cable upstream 0.33...10 mm² flexible","IP degree of protection":"IP20 conforming to IEC 60529","Device location in system":"Group incomer","Earth-leakage sensitivity":"300 mA","Product or component type":"Add-on residual current device","Electrical connection to mcb":"By screws","[Ui] rated insulation voltage":"400 V AC 50 Hz conforming to EN 61009-1","Earth-leakage protection class":"Type AC","[Ue] rated operational voltage":"400 V AC 50 Hz phase to phase","Ambient air temperature for storage":"-40...60 °C","Earth-leakage protection time delay":"Instantaneous","Residual current tripping technology":"Voltage independent","Ambient air temperature for operation":"-5...60 °C","[Uimp] rated impulse withstand voltage":"6 kV conforming to EN 61009-1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/eac3e687d8f27a57cc84371e29d0aeec.pdf","sourceUrl":"https://www.se.com/uk/en/product/A9N21491/prodis-earth-leakage-addon-block-vigi-tg40-3p-+-n-25a-300ma/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9N21491/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the A9N21491?","answer":"We source the A9N21491 to order against an RFQ through our independent distribution network. Availability and current pricing are confirmed at the time of your quote request."},{"question":"What is the A9N21491 used for?","answer":"It is an add-on residual current device (RCD) for DIN-rail distribution boards, providing earth-leakage protection for a group of downstream circuits fed through a compatible MCB. The 300 mA sensitivity makes it suitable for fire protection rather than direct personnel shock protection."},{"question":"What standards does the A9N21491 comply with?","answer":"It complies with IEC 60947-2, EN 61009-1, and EN 61009-2-1. Rated insulation voltage is 400 V AC at 50 Hz per EN 61009-1, and impulse withstand voltage is 6 kV per the same standard."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N21491","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/A9N21491 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}}