{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH7122-1AB00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH7122-1AB00","canonicalUrl":"https://aoctrl.com/siemens/3RH7122-1AB00","factsUrl":"https://aoctrl.com/api/mcp/products/3RH7122-1AB00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay, size S00, 3RH7122-1AB00, 2 NO + 2 NC, 24 V AC coil, screw-type terminals, IP20 front, snap-on 35 mm DIN rail.","salesMarkdown":"## Part overview and fit The Siemens SIRIUS 3RH7122-1AB00 is a contactor relay — essentially a switching block for control circuits, not a main power contactor. It carries 2 normally-open and 2 normally-closed auxiliary contacts (designation 22 E) rated for PLC-level switching down to 17 V, 5 mA, which means it's reliable for digital input signals without contact wetting issues. The coil is 24 V AC, drawing 27 VA inrush and 5.4 VA holding. It snaps onto 35 mm DIN rail and accepts screw-type terminals for 2x 0.5–2.5 mm² or 2x 4 mm² solid/stranded wire. The 6 A rated current at 24 V AC (and also at 230 V and 400 V) is the thermal continuous current through the auxiliary contacts — enough for pilot lights, contactor coils, or small solenoid valves. The 1 A rating at 690 V and 110 V reflects the switching capacity at those voltages. The surge voltage resistance of 22 kV means the contact gap can withstand lightning-induced transients common in industrial mains. The S00 size is the smallest SIRIUS frame, so it fits in tight DIN-rail layouts. Operating temperature range is -10 to +55 °C; storage from -25 to +70 °C. Installation altitude up to 2000 m above sea level. The shock resistance is 15g / 5 ms sine pulse, adequate for most industrial panels.","metaTitle":"Siemens 3RH7122-1AB00 SIRIUS Contactor Relay, 2NO+2NC, 24 VA","metaDescription":"Siemens SIRIUS 3RH7122-1AB00 contactor relay, size S00, 2NO+2NC, 24 VAC coil, screw terminals, IP20, snap-on 35mm DIN rail. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Width":"45 mm","title":"3RH7122-1AB00","Height":"57.5 mm","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","description":"Contactor relay 2NO2NC AC 24V 50/60Hz size S00, screw terminal","During Storage":"-25 ... +70 °C","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"Contactor relay","at 24 V rated value":"6 A","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"6 A","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","at 690 V rated value":"1 A","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","Surge Voltage Resistance Rated Value":"22 kV","operating frequency at DC-13 maximum":"1 000 1/h","shock resistance with sine pulse at AC":"15g / 5 ms, 8g / 10 ms","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"acceptability for PLC control (17 V, 5 mA)","apparent holding power of magnet coil at AC":"5.4 VA","apparent pick-up power of magnet coil at AC":"27 VA","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"AC","shock resistance at rectangular impulse at AC":"10g / 5 ms, 5g / 10 ms","Inductive Power Factor With Closing Power Of The Coil":"0.8","Identification Number And Letter For Switching Elements":"22 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e1653a102063f4578cca3f1f6d1f9ad2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1533807&mlfb=3RH7122-1AB00"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH7122-1AB00?","answer":"The 3RH2422-1AB00 is a peer in the same SIRIUS family but from a different generation. Both are size S00 contactor relays with 2NO+2NC contacts and a 24 V AC coil. The main difference is the terminal type — the 3RH7122-1AB00 uses screw terminals, while the 3RH2422-1AB00 uses spring-cage terminals. Panel footprint and DIN-rail mounting are identical, so a swap does not require rewiring the rail position."},{"question":"Will 3RH7122-1AB00 drop into a panel originally specified for 3RH2422-1AB00?","answer":"Yes, the mounting footprint on 35 mm DIN rail is identical. The only difference is the terminal type: screw terminals on 3RH7122-1AB00 versus spring-cage on 3RH2422-1AB00. Wiring must be re-terminated if the original used spring-cage, but the physical fit and contact arrangement (2NO+2NC) are the same."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH7122-1AB00","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/3RH7122-1AB00 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}}