{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1644-8RC32","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1644-8RC32","canonicalUrl":"https://aoctrl.com/siemens/5SU1644-8RC32","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1644-8RC32","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SU1644-8RC32 RCBO, 32 A, 4-pole, 7 modules, D characteristic, Type A 300mA residual current protection.","salesMarkdown":"The Siemens 5SU1644-8RC32 is a 4-pole RCBO rated at 32 A with D characteristic and Type A residual current protection at 300 mA. It occupies 7 module widths on a DIN rail, sized for a three-phase plus neutral circuit where you need both overcurrent and earth-leakage protection in one device. The 32 A rating governs the continuous load the RCBO can carry — sized for a 32 A final subcircuit feeding a motor group, a small distribution board, or a piece of fixed equipment. The D characteristic (10–20× In magnetic trip) is the deciding factor for fit: it avoids tripping on the inrush of a 7.5 kW DOL motor or a bank of discharge lamps, where a C-curve device would nuisance-trip. The 300 mA Type A residual element provides earth-fault protection for circuits with electronics or rectified loads — VFDs, UPS systems, or LED drivers — that generate smooth DC fault currents an AC-only RCD cannot detect. ## Panel integration The 4-pole format covers L1, L2, L3, and N — the neutral is switched and monitored for residual current. At 7 modules wide, it fills about 125 mm of rail; plan for that footprint in a sub-distribution board or a motor control centre.","metaTitle":"Siemens 5SU1644-8RC32 RCBO 32 A 4-pole D curve Type A 300mA","metaDescription":"Siemens 5SU1644-8RC32 RCBO, 32 A, 4-pole, 7 modules, D characteristic, Type A 300mA residual current. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bed74928c9539d6c50f1eb1e06da07d1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=337592&mlfb=5SU1644-8RC32","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1644-8RC32/alternatives.json"},"ai":{"faq":[{"question":"How do I get pricing and availability for the 5SU1644-8RC32?","answer":"The 5SU1644-8RC32 is sourced and quoted to order against an RFQ through independent distribution. Current pricing and availability are confirmed at quote time."},{"question":"What does the D characteristic mean on this RCBO?","answer":"The D characteristic means the magnetic trip operates at 10–20 times the rated current (320–640 A for this 32 A unit), designed to handle high inrush loads like motor starting or transformer energisation without nuisance tripping."},{"question":"What is the residual current rating and type?","answer":"The residual current rating is 300 mA, Type A, which detects pulsating DC fault currents — suitable for circuits with rectified loads such as VFDs, UPS systems, or LED drivers."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1644-8RC32","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/5SU1644-8RC32 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}}