{"product_id":"siemens-3rh1921-1ca10-sirius-auxiliary-switch-block-1no","title":"Siemens 3RH1921-1CA10 | SIRIUS Auxiliary Switch Block | 1NO Front Mount | Screw Terminal Contactor Block | Brand New Original","description":"\u003cdiv style=\"width: 100%; max-width: 850px; margin: 20px auto; font-family: 'Inter', system-ui, sans-serif; color: #333; line-height: 1.6; border: 3px solid #000000; border-radius: 12px; overflow: hidden; background: #ffffff; box-shadow: 0 4px 15px rgba(0,0,0,0.1);\"\u003e\n\n    \u003cdiv style=\"background: #009999; padding: 25px 30px; color: #ffffff;\"\u003e\n        \u003cdiv style=\"font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 5px; opacity: 0.95; color: #ffffff;\"\u003eLow-Voltage Control Controls | SEO Optimized\u003c\/div\u003e\n        \u003ch1 style=\"margin: 0; font-size: clamp(20px, 5vw, 26px); font-weight: 800; color: #ffffff;\"\u003eSiemens 3RH1921-1CA10 Switch Block\u003c\/h1\u003e\n    \u003c\/div\u003e\n\n    \u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; border: 1px solid #009999;\"\u003e\n        \u003ctr style=\"background: #e6f5f5;\"\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 700; width: 40%;\"\u003eOrder Code (Model)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 800;\"\u003e3RH1921-1CA10\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003eProduct Portfolio\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 700;\"\u003eSIRIUS Modular Electrical Control Infrastructure\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr style=\"background: #e6f5f5;\"\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003eContact Layout Configuration\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 800;\"\u003e1 Normally Open (1NO) | 0 Normally Closed (0NC)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003eMounting Implementation\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 700;\"\u003eFront Plate Snap-On Clip Placement (Toolless Mounting)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr style=\"background: #e6f5f5;\"\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003ePhysical Terminal Interface\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 800;\"\u003eHeavy-Duty Rigid Screw Clamp Connections Matrix\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003eHardware Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 700;\"\u003eSIRIUS 3RT1 Contactors \u0026amp; 3RH11 Relays (Size S0 to S12)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr style=\"background: #e6f5f5;\"\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003eInsulation Rated Voltage\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 800;\"\u003e690 V AC Rated Circuit Boundary Standards\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; color: #666;\"\u003eMechanical Operation Life\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 15px; border: 1px solid #009999; font-weight: 700;\"\u003eUp to 10 Million Reliable Operational Switching Cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n\n    \u003cdiv style=\"padding: 30px;\"\u003e\n        \u003ch2 style=\"font-size: 18px; font-weight: 800; color: #333; margin-top: 0;\"\u003ePerformance Overview\u003c\/h2\u003e\n        \u003cp style=\"font-size: 14px; color: #555; line-height: 1.8;\"\u003e\n            The Siemens 3RH1921-1CA10 is an industrial-tier premium standard auxiliary switch extension block meticulously engineered within the flagship SIRIUS low-voltage modular control hardware network. Purpose-built to seamlessly expand auxiliary terminal signaling loops and dynamic latching architectures for primary power contactors, this highly durable add-on component manages a precise 1NO contact point fluidly. The optimized frontal latch structure enables quick, direct snap integration onto standard 3RT1 power contactors or 3RH11 control relays across multiple frame boundaries without taking up extra lateral panel tracks. Complete with premium screw clamp wiring terminal channels and high-grade electrical contact plating parameters, it sustains critical plant grid distributions with absolute operational consistency.\n        \u003c\/p\u003e\n\n        \u003cdiv style=\"background: #fdfdfd; border: 2px solid #eee; border-radius: 12px; padding: 25px; border-left: 10px solid #009999; margin-top: 20px;\"\u003e\n            \u003ch3 style=\"margin-top: 0; font-size: 16px; color: #333;\"\u003e📋 Critical Application Check\u003c\/h3\u003e\n            \u003cul style=\"font-size: 14px; color: #555; padding-left: 20px;\"\u003e\n                \u003cli\u003e\n\u003cstrong\u003eIndustry:\u003c\/strong\u003e Centralized Motor Control Enclosures (MCC), Industrial Water Treatment Switchboards, Heavy Automation Assembly Line Signal Latching, Remote Running Indicator Feedbacks.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eFront-Mount Space Efficiency:\u003c\/strong\u003e Direct frontal placement overrides the need for side expansion blocks, conserving essential horizontal spacing inside dense electrical distribution cabinet grids.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eGas-Tight Screw Clamp Advantage:\u003c\/strong\u003e Robust mechanical screw channels lock heavy wiring cores reliably, resisting intense machinery resonance patterns and thermal expansions seamlessly.\u003c\/li\u003e\n            \u003c\/ul\u003e\n\n            \u003ch4 style=\"font-size: 14px; color: #333; margin-top: 20px; font-weight: 800;\"\u003eSiemens SIRIUS Control Systems Integration:\u003c\/h4\u003e\n            \u003cul style=\"font-size: 14px; color: #555; padding-left: 20px;\"\u003e\n                \u003cli\u003eSIRIUS Auxiliary Contacts Group: \n                    \u003ca href=\"\/zh\/collections\/siemens\" style=\"color: #009999; text-decoration: underline; font-weight: 700;\"\u003eSiemens 3RH19 Auxiliary Blocks Collection\u003c\/a\u003e\n                \u003c\/li\u003e\n                \u003cli\u003ePrecision Plant Hardware Networks: \n                    \u003ca href=\"\/zh\/collections\/siemens\" style=\"color: #009999; text-decoration: underline; font-weight: 700;\"\u003eSiemens High-Efficiency Industrial Switching Elements \u0026amp; Components\u003c\/a\u003e\n                \u003c\/li\u003e\n            \u003c\/ul\u003e\n        \u003c\/div\u003e\n    \u003c\/div\u003e\n\u003c\/div\u003e","brand":"YingZhou Automatization","offers":[{"title":"3RH1921-1CA10","offer_id":58065491853615,"sku":"3RH1921-1CA10","price":4.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/9473\/5919\/files\/Siemens-3RH1921-1CA10-SIRIUS-Auxiliary-Switch-Block-1NO-Front-Mount-Screw-Terminal-Contactor-Block-Brand-New-Original.jpg?v=1781188529","url":"https:\/\/szyingzhou.com\/zh\/products\/siemens-3rh1921-1ca10-sirius-auxiliary-switch-block-1no","provider":"YingZhou Automatization","version":"1.0","type":"link"}