{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"E3FB-RP21","brand":"Omron","brandSlug":"omron","productSlug":"E3FB-RP21","canonicalUrl":"https://aoctrl.com/omron/E3FB-RP21","factsUrl":"https://aoctrl.com/api/mcp/products/E3FB-RP21","rawCanonicalId":null},"summary":{"shortDescription":"Omron E3FB series retroreflective photoelectric sensor, M18 threaded, PNP output, M12 4-pin connector, 4 m sensing distance, mirror surface rejection, IP67/IP69K.","salesMarkdown":"The Omron E3FB-RP21 is a retroreflective photoelectric sensor in the E3FB series, delivering a 4 m sensing range with a PNP output. It connects via a 4-pin M12 connector—no cable to manage—so it swaps quickly in panels already wired with M12 receptacles. The Mirror Surface Rejection (MSR) feature helps avoid false triggers from shiny targets, a common headache on conveyor or packaging lines. Rated IP67 and IP69K, it handles washdown environments. The closest functional sibling is the E3FB-RN112M, same retroreflective method, 4 m range, and MSR. The critical difference: the RP21 uses a PNP output with an M12 connector, while the RN112M is NPN with a 2 m prewired cable. If your IO card expects PNP, the RP21 is the drop-in; if the panel uses a cable gland and NPN, the RN112M needs no adapter. Wiring change is straightforward if swapping families—connector vs cable and output polarity are the only rewiring items.","metaTitle":"Omron E3FB-RP21 Photoelectric Sensor, M12 PNP Retroreflectiv","metaDescription":"Omron E3FB-RP21 retroreflective sensor with Mirror Surface Rejection, PNP, M12 connector, 4m range. Active production. Spec to BOM or RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Photoelectric Sensors"],"specifications":{"title":"E3FB-RP21","Series":"E3FB","Features":"Mirror Surface Rejection (MSR)","IP Rating":"IP67; IP69K","Standards":"CE","Display Qty":"1","description":"OMRON Photoelectric Sensor: M18 Threaded, Built-in Connector, 4 - Pin M12 Connector, 10-30V DC, PNP","Product Type":"Photoelectric Sensor","Body Material":"Brass","Response Time":"0.5 msec","Number of Pins":"4","Output Circuit":"PNP","Overall Height":"48 mm","Sensing Method":"Retroreflective","Supply Voltage":"10-30V DC","Sensor Diameter":"18 mm","lifecycle_stage":"current","Display Sell UOM":"EA","Overall Diameter":"18 mm","Sensor Body Style":"Cylindrical","Minimum Object Size":"7mm Dia. Opaque","Output Circuit Type":"PNP","Supply Voltage Type":"DC-Only","Emitted Sensor Light":"Red Light","Electrical Connection":"M12","Sensor Connector Type":"4 - Pin M12","Sensor Switching Mode":"Selectable Light On/Dark On","Load Current - Maximum":"100 mA","Nominal Sensor Diameter":"M18 Threaded","Sensor Face Orientation":"Straight","DC Supply Voltage Rating":"10-30V DC","Includes Indicator Lights":"Indicator Lights Included","Sensing Distance - Maximum":"4 m","Sensing Distance - Minimum":"100 mm","Electrical Installation Type":"Direct Connector","Operating Temperature - Maximum":"131 °F","Operating Temperature - Minimum":"-13 °F","Cylindrical Sensor Dims. (D x L)":"18 mm x 48 mm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$34.16","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0e9f14f6c7a11d6896ae1d6b08000337.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest second-source if I need a different output or connection?","answer":"The E3FB-RN112M shares the same sensing method (retroreflective, 4 m range) and MSR, but it uses NPN output and a 2 m prewired cable instead of the RP21's PNP and M12 connector. That makes it a functional alternative only if your system can accept the different output polarity and wiring style."},{"question":"What is Mirror Surface Rejection (MSR)?","answer":"MSR is a feature that filters out false reflections from shiny or mirrored surfaces, letting the sensor reliably detect opaque objects without being fooled by the target's reflective finish."},{"question":"Can the E3FB-RP21 replace an E3FB-RN112M without rewiring?","answer":"Not without changes. The RP21 uses a PNP output and an M12 connector, whereas the RN112M is NPN with a 2 m prewired cable. You would need to swap the connector (or add an M12 pigtail) and ensure the input card accepts PNP. If your card handles both, a terminal swap is possible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/E3FB-RP21","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/E3FB-RP21 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}}