{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9L20421","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9L20421","canonicalUrl":"https://aoctrl.com/schneider/A9L20421","factsUrl":"https://aoctrl.com/api/mcp/products/A9L20421","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Acti9 iPRD20r, Type 2 surge arrester, 4P, 20 kA max discharge, 230/400 V AC, DIN rail clip-on, white (RAL 9003).","salesMarkdown":"## Type 2 SPD for IT earthing systems — what the ratings mean The Schneider Electric A9L20421 is an Acti9 iPRD20r Type 2 surge arrester with pluggable MOV cartridges, rated for 230/400 V AC (+/- 10 %) at 50/60 Hz and designed for IT earthing systems. The 20 kA common-mode maximum discharge current (L/PE and N/PE) tells you it can handle a direct lightning strike's residual energy after the main Type 1 stage — not the full stroke itself. The nominal discharge current of 5 kA (8/20 µs) is the rating that governs its daily life: every surge event up to that level the MOV absorbs without degrading its protection curve. The voltage protection level stays under 1.8 kV (common mode, type 2 N/PE), which means downstream equipment with 2.5 kV impulse withstand (IEC 60664-1 category III) sees a safe clamping voltage. The maximum continuous operating voltage (MCOV) is 460 V L/PE, so it won't cook itself on a 400 V phase-to-phase system even with nominal fluctuations. ## DIN rail integration and panel fit The 72 mm width occupies 4 module pitches (9 mm each, 8 pitches total per, so 72 mm). Depth of 69 mm and height of 85 mm mean it fits most distribution boards with a 100 mm deep enclosure. Tunnel-type terminals accept 2.5 to 25 mm² rigid or 4 to 16 mm² flexible (with or without ferrule), strip length 14 mm, tightening torque 3.5 N·m. The white RAL 9003 housing matches the Acti9 family aesthetic for commercial panel builds. Designed to EN 61643-11:2012 and IEC 61643-11:2011 — the Type 2 test class for permanently connected AC power-circuit SPDs. The temporary overvoltage (TOV) withstand is 337 V L/N for 5 seconds; above that, the safe failure mode triggers at 1455 V L/PE or N/PE for 200 ms. Ground leakage current is 0.6 mA. Operating temperature range -25 to 60 °C, storage -40 to 85 °C, relative humidity 5–95 %. Remote signalling via a 1 C/O contact rated 0.25 A / 250 V AC.","metaTitle":"Schneider Electric A9L20421 Acti9 iPRD20r Type 2 SPD, 20 kA","metaDescription":"Schneider Electric A9L20421 Acti9 iPRD20r Type 2 surge arrester. 20 kA max discharge, 230/400 V AC, 4P, DIN rail mount. Active production, sourced to order. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"69 mm","Width":"72 mm","Colour":"White (RAL 9003)","Height":"85 mm","Standards":"EN 61643-11:2012 IEC 61643-11:2011","9 Mm Pitches":"8","Product name":"Acti9 iPRD","Mounting mode":"Clip-on (DIN rail)","Earthing system":"IT","lifecycle_stage":"current","Range Of Product":"Acti9","Range of product":"IPRD","Targeted country":"All","Device short name":"iPRD20r","Poles description":"4P","Relative humidity":"5...95 %","Remote signalling":"With","Tightening torque":"3.5 N.m","Compatibility code":"IPRD20r","Device application":"Distribution","Operating altitude":"2000 m","Surge arrester type":"Electrical distribution network","Wire stripping length":"14 mm","Connections - terminals":"Tunnel type terminal (top or bottom) 2.5...25 mm² rigid Tunnel type terminal (top or bottom) 4...16 mm² flexible Tunnel type terminal (top or bottom) 4...16 mm² flexible with ferrule","Short-circuit withstand":"5 kA 415 V Ph/Ph","Disconnector device type":"Associated circuit breaker IC60N 20 A curve C - Icu 10 kA Associated circuit breaker iC60H 20 A curve C - Icu 15 kA Associated circuit breaker iC60L 20 A curve C - Icu 25 kA Associated fuse gG 40 A - Icu 15 kA Associated fuse gG 80 A - Icu 50 kA Associated circuit breaker NG125H 20 A curve C - Icu 36 kA Associated circuit breaker NG125L 20 A curve C - Icu 50 kA","Maximum discharge current":"Common mode: 20 kA L/PE Common mode: 20 kA N/PE","Nominal discharge current":"Common mode: 5 kA (L/PE) Common mode: 5 kA (N/PE)","Product or component type":"Surge arrester with pluggable cartridge","Surge arrester class type":"Type 2","Surge arrester technology":"MOV","Signalling circuit voltage":"0.25 A/250 V AC 50/60 Hz","[Ut] temporary overvoltage":"337 V L/N 5 s withstand 1455 V L/PE 200 ms safe failure mode 1455 V N/PE 200 ms safe failure mode","Signal contacts composition":"1 SD (1 C/O)","[Ipe] Ground residual current":"0.6 mA","[Ue] rated operational voltage":"230/400 V AC (+/- 10 %) at 50/60 Hz","Ambient air temperature for storage":"-40...85 °C","Ambient air temperature for operation":"-25...60 °C","Maximum [Up] voltage protection level":"Common mode Common mode <1.8 kV type 2 N/PE","[Uc] maximum continuous operating voltage":"Common mode: 460 V L/PE"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$81.38","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/sg/en/product/A9L20421/iprd20r-modular-surge-arrester-4p-it-460v-with-remote-transfert/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9L20421/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to A9L20421 in this component family?","answer":"Within the Acti9 iPRD family, the A9L20421 is the 4P, 20 kA variant for IT earthing systems. The closest functional sibling would be the iPRD20r in a different pole configuration or earthing system variant — verify the specific order code against your system's earthing type (IT vs TN/TNS) and required pole count before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9L20421","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/A9L20421 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}}