{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"K8AC-H21PC-FLK","brand":"Omron","brandSlug":"omron","productSlug":"K8AC-H21PC-FLK","canonicalUrl":"https://aoctrl.com/omron/K8AC-H21PC-FLK","factsUrl":"https://aoctrl.com/api/mcp/products/K8AC-H21PC-FLK","rawCanonicalId":null},"summary":{"shortDescription":"Omron K8AC-H21PC-FLK Heater Element Detector, Series K8AC-H, input range 0.20 ~ 2.20A, relay output, RS-485 CompoWay/F communications, 85-264VAC supply, DIN rail mount, spring terminal.","salesMarkdown":"## What the K8AC-H21PC-FLK Detects and Why It Matters The K8AC-H21PC-FLK is a dedicated heater element detector, not a general-purpose temperature controller. Its input range of 0.20 ~ 2.20 A means it monitors the current draw of a heater load to detect open elements or partial failures before the process drifts. The relay output triggers on fault — wire it into the safety chain or a PLC alarm input. The 4-digit red LED shows the actual current reading, not just a pass/fail flag, which helps during commissioning to confirm the heater load matches the nameplate. ## Power Supply and Mounting — Panel Fit Wide-range universal supply: 85 ~ 264 VAC, so it runs on any standard line voltage from 100 V to 240 V without a transformer tap change. That saves a panel re-spin if the site voltage differs from the design assumption. Mounts on DIN rail — snaps onto the standard 35 mm rail alongside the contactors and power supplies. The spring-cage terminals (push-in style) accept solid or ferruled stranded wire; no screwdriver needed for the power or signal connections. Operating range is -10 °C to 55 °C, which covers most indoor panel environments. If the panel sits in direct sun or next to a furnace, budget for derating above 55 °C ambient. ## RS-485 CompoWay/F — Integration Note The RS-485 port uses Omron's CompoWay/F protocol, which is a master-slave serial bus. The K8AC-H21PC-FLK acts as a slave device; the PLC or SCADA polls it to read the measured current and fault status. Baud rate and node address are set via the front-panel buttons or software — no DIP switches. On a multi-drop line, each K8AC-H21PC-FLK needs a unique address. The 4-character LED displays the address during setup, which helps during commissioning when you are verifying which unit is which on the bus.","metaTitle":"Omron K8AC-H21PC-FLK Heater Element Detector","metaDescription":"Omron K8AC-H21PC-FLK heater element detector with RS-485 CompoWay/F, 85-264VAC supply, relay output. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"Type":"Heater Element Detector","title":"K8AC-H21PC-FLK","Series":"K8AC-H","Weight":"0.441 lb (200.03 g)","Package":"Bulk","Features":"Heater Fault Detection","Input Range":"0.20 ~ 2.20A","Output Type":"Relay","description":"DETECT HEATER ELEMENT 85-264V","Display Type":"LED - Red Characters","Mounting Type":"DIN Rail","Communications":"RS-485 (CompoWay/F)","lifecycle_stage":"current","Voltage - Supply":"85 ~ 264VAC","Termination Style":"Spring Terminal","Operating Temperature":"-10°C~55°C","Number of Characters Per Row":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is K8AC-H21PC-FLK's listed type on this Process / Temperature Controllers line?","answer":"The K8AC-H21PC-FLK is listed as a heater element detector, not a standard temperature controller. It monitors the current draw of a heater load to detect open elements or partial failures."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/K8AC-H21PC-FLK","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/omron/K8AC-H21PC-FLK 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}}