{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N18543","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N18543","canonicalUrl":"https://aoctrl.com/schneider/A9N18543","factsUrl":"https://aoctrl.com/api/mcp/products/A9N18543","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Acti9 Vigi C120, add-on residual current device, 4P, 300 mA, Type AC, 125 A, IP20, clip-on DIN rail.","salesMarkdown":"The Schneider Electric A9N18543 is an Acti9 Vigi C120 add-on residual current device (RCD) — a 4-pole, 300 mA sensitivity, Type AC earth-leakage block that clips onto the outgoing side of a compatible Acti9 C120 MCB. It's voltage-independent, so it trips on residual current alone without needing a separate power supply to the electronics. Rated 125 A continuous at 230...415 V AC, 50/60 Hz, it's sized for the main incomer or a large subfeed in a commercial or light-industrial distribution board. The 300 mA sensitivity is the standard for fire-protection RCDs — it won't nuisance-trip on normal leakage from long cable runs or equipment filters, but it still clears a ground fault before the fault energy reaches ignition levels. The 125 A rating matches the C120 MCB frame, so the RCD and MCB share the same continuous-current capacity — no derating mismatch on the outgoing feeder. Pollution degree 3 per IEC 60947-2 means it's rated for the conductive-dust and condensation environment inside a typical distribution panel — no need for a sealed enclosure unless the panel itself is in a washdown zone. The IP20 finger-safe terminals are fine behind a locked cabinet door. The 6 kV impulse withstand voltage (Uimp) tells you it survives the switching surges and indirect lightning strikes common on 230/400 V networks without flashover across the internal gap. The 4-pole block occupies 10 x 9 mm pitches (90 mm of rail width). It connects to the MCB via screws through the tunnel terminals — 1 to 50 mm² rigid or 1 to 35 mm² flexible, stripped 15 mm, torqued to 3.5 N·m. That's a heavy cable range for a 125 A feeder; you can land a 50 mm² tail without a pin ferrule.","metaTitle":"Schneider Electric A9N18543 Acti9 Vigi C120, 4P 300 mA Type","metaDescription":"Schneider Electric A9N18543 Acti9 Vigi C120 add-on residual current device, 4P, 300 mA sensitivity, Type AC, 125 A rated current, active production, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"73 mm","Range":"Acti9","Width":"198 mm","title":"A9N18543","Colour":"White","Height":"95 mm","Standards":"EN 61009 IEC/EN 61009-2-1","description":"Vigi C120 - earth leakage add-on block - 4P - 300 mA - class AC","9 Mm Pitches":"10","Network type":"AC","Product name":"Acti9 Vigi C120","Mounting mode":"Clip-on","lifecycle_stage":"current","Mounting support":"35 mm symmetrical DIN rail","Pollution degree":"3 conforming to IEC 60947-2","Device short name":"Vigi C120","Network frequency":"50/60 Hz","Poles description":"4P","Tightening torque":"3.5 N.m","[In] rated current":"125 A","Mechanical durability":"20000 cycles","Wire stripping length":"15 mm","Connections - terminals":"Tunnel type terminals 1...35 mm² flexible Tunnel type terminals 1...50 mm² rigid","IP degree of protection":"IP20","Device location in system":"Outgoer 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":"500 V AC 50/60 Hz conforming to IEC 60947-1","Earth-leakage protection class":"Type AC","[Ue] rated operational voltage":"230...415 V AC 50/60 Hz","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 IEC 60947-2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ddd79771255b5a4cd287480dbb53dd85.pdf","sourceUrl":"https://www.se.com/ae/en/product/A9N18543/vigi-c120-earth-leakage-addon-block-4p-300-ma-class-ac/"},"ai":{"faq":[{"question":"What is the A9N18543 used for?","answer":"It's an add-on residual current device (RCD) that clips onto an Acti9 C120 MCB to provide earth-leakage protection on a 4-pole, 125 A, 230/415 V AC circuit. Typical use is as the main incomer or large subfeed RCD in a commercial distribution board."},{"question":"Where can I buy the A9N18543?","answer":"The A9N18543 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the difference between Type AC and Type A RCDs?","answer":"Type AC (this device) detects sinusoidal AC residual currents only. Type A also detects pulsating DC residual currents from rectified loads. If your circuit supplies VFDs, switched-mode power supplies, or other electronics, specify a Type A or Type B RCD instead."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N18543","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/A9N18543 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}