{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LADN31A","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LADN31A","canonicalUrl":"https://aoctrl.com/schneider/LADN31A","factsUrl":"https://aoctrl.com/api/mcp/products/LADN31A","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys Deca auxiliary contact block, LADN31A, 3NO + 1NC, front mounting, snap-in terminals, 10 A thermal current, 690 V insulation.","salesMarkdown":"The LADN31A is an auxiliary contact block from the TeSys Deca range, designed to snap onto the front of a contactor or reversing starter to add extra control-circuit signalling or interlocking contacts. It provides three normally-open and one normally-closed instantaneous poles — a 3NO + 1NC configuration that covers most feedback and logic needs without requiring two separate blocks. Rated operational current depends on the duty: 6 A at 120 V AC-15 (typical for contactor coils and solenoid valves), 1.04 A at 690 V AC-15, and 0.55 A at 125 V DC-13 or 0.1 A at 600 V DC-13 for DC switching. The conventional free-air thermal current is 10 A at 60 °C, which sets the wiring and fuse limit — protect with a 10 A GG fuse per the spec. The block carries approvals to EN/IEC 60947-5-1, UL 60947-5-1, and CSA C22.2 No 60947-5-1, so it's accepted in North American and European control panels without extra qualification. The 10 A thermal current (Ith) is the continuous current the block can carry in free air at 60 °C — this is the rating to use for bus-bar or common-feed wiring through the block, not the switching rating. For actual load switching, use the AC-15 or DC-13 values: at 120 V AC the block can switch 6 A of inductive load, enough for a bank of contactor coils; at 690 V AC the current drops to 1.04 A, reflecting the higher arc energy. Minimum switching capability is 5 mA at 17 V — below that, the contacts may not reliably wet the circuit. This matters for PLC digital inputs or dry-contact signals where the leakage current is very low. The block is not rated for electronic-level switching below those thresholds. It is intended for clean, dry panel environments, not washdown or outdoor locations. Operating altitude is rated to 3000 m (9842 ft) without derating; above that, air density reduction may affect dielectric withstand. Front-mounting snaps directly onto the contactor or reversing starter without tools. The snap-in terminals accept 1 to 4 mm² flexible or rigid wire (with or without cable end), with two terminal positions per pole — one for the incoming wire, one for daisy-chaining to the next block. Terminal 1 accepts up to 4 mm², terminal 2 accepts up to 2.5 mm² with a cable end or 4 mm² without. Dimensions are compact: 44 mm wide, 42 mm deep, 48 mm tall — it adds minimal depth to the contactor footprint. The dark grey housing matches the TeSys Deca aesthetic and makes the block visually distinct from the main contactor body.","metaTitle":"LADN31A TeSys Deca Auxiliary Contact Block, 3NO+1NC, 10 A","metaDescription":"Schneider TeSys Deca LADN31A auxiliary contact block, 3NO+1NC, front mount, snap-in terminals. Rated 690 V, 10 A thermal, active production. RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Control Accessories"],"specifications":{"Color":"Dark grey","Depth":"1.7 in (42 mm)","Range":"TeSys TeSys Deca","Width":"1.7 in (44 mm)","title":"LADN31A","Height":"1.9 in (48 mm)","Category":"US10I1222341","Standards":"EN/IEC 60947-5-1 UL 60947-5-1 CSA C22.2 No 60947-5-1 GB/T 14048.5 EN 50012 IEC 60335-1:Clause 30.2 IEC 60335-2-40:Annex JJ","description":"Auxiliary contact block, TeSys Deca, 3NO + 1NC, front mounting, snap-in terminals","Product name":"TeSys Deca","Protection type":"GG fuse 10 A","lifecycle_stage":"current","Non-overlap time":"1.5 ms on de-energisation no overlap between NC and NO contact 1.5 ms on energisation no overlap between NC and NO contact","Device short name":"LADN","Mounting Location":"Front","Contacts operation":"Instantaneous","Operating altitude":"9842.52 ft (3000 m)","Protective treatment":"TH IEC 60068","Insulation resistance":"> 10 MOhm","Mechanical durability":"30 Mcycles","Nbr. of units in pkg.":"1","Connections - terminals":"snap-in terminal 1 0.002...0.006 in² (1...4 mm²)flexible with cable end snap-in terminal 1 0.002...0.006 in² (1...4 mm²)flexible without cable end snap-in terminal 2 0.002...0.004 in² (1...2.5 mm²)flexible with cable end snap-in terminal 2 0.002...0.006 in² (1...4 mm²)flexible without cable end snap-in terminal 1 0.002...0.006 in² (1...4 mm²)rigid without cable end snap-in terminal 2 0.002...0.006 in² (1...4 mm²)rigid without cable end","IP degree of protection":"IP2X conforming to IEC 60529","Pole contact composition":"3 NO + 1 NC","Minimum switching current":"5 mA","Minimum switching voltage":"17 V","Product or Component Type":"Auxiliary contact block","Irms rated making capacity":"140 A AC conforming to IEC 60947-5-1 250 A DC conforming to IEC 60947-5-1","Environmental characteristic":"Normal environment","Permissible short-time rating":"100 A 140 °F (60 °C) 1 s 120 A 140 °F (60 °C) 500 ms 140 A 140 °F (60 °C) 100 ms","[Ui] rated insulation voltage":"690 V IEC 60947-5-1","[Ie] rated operational current":"6 A at 120 V AC-15 1.04 A at 690 V AC-15 0.55 A at 125 V DC-13 0.1 A at 600 V DC-13","[Ue] rated operational voltage":"690 V AC 25...400 Hz","Ambient Air Temperature for Storage":"-76...176 °F (-60...80 °C)","Ambient Air Temperature for Operation":"23...140 °F (-5...60 °C)","[Ith] conventional free air thermal current":"10 A (at 140 °F (60 °C))"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$54.06","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/92052216a908f6363545a93c39b260ef.pdf","sourceUrl":"https://www.se.com/uk/en/product/LADN31A/auxiliary-contact-block-tesys-deca-3no-+-1nc-front-mounting-snapin-terminals/"},"ai":{"faq":[{"question":"What are the key ratings for LADN31A?","answer":"It is a 3NO + 1NC auxiliary contact block rated 10 A thermal current (Ith) at 60 °C, 690 V insulation voltage, with AC-15 switching of 6 A at 120 V and DC-13 switching of 0.55 A at 125 V. Minimum switching is 5 mA at 17 V."},{"question":"What approvals does LADN31A carry?","answer":"It is approved to EN/IEC 60947-5-1, UL 60947-5-1, CSA C22.2 No 60947-5-1, GB/T 14048.5, EN 50012, and meets glow-wire requirements of IEC 60335-1 Clause 30.2 and IEC 60335-2-40 Annex JJ."},{"question":"What wire sizes does the snap-in terminal accept?","answer":"Terminal 1 accepts 1 to 4 mm² flexible or rigid wire (with or without ferrule). Terminal 2 accepts 1 to 2.5 mm² flexible with ferrule, or 1 to 4 mm² flexible without ferrule or rigid without ferrule."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LADN31A","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/LADN31A 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}}