{"product_id":"siemens-3rh1921-1ea11-10a-2p-500v-auxiliary-switch","title":"Siemens 3RH1921-1EA11 Auxiliary Switch, 10A, 2-Pole, 500V","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens \u003cb\u003e3RH1921-1EA11\u003c\/b\u003e Auxiliary Switch is engineered to deliver dependable signaling and control in demanding industrial environments. Built to integrate with control circuits and panel-based automation, this 2-pole accessory is designed to reliably switch the logic or control signals that energize relays, contactors, and other automation components.\u003c\/p\u003e \u003ch2\u003eWhy this auxiliary switch stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eTwo-pole design\u003c\/b\u003e provides clear, isolated control paths for signaling and logic within industrial control panels.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003e10 A current rating\u003c\/b\u003e supports typical control circuit loads without overtaxing the switch, helping to extend the life of your control hardware.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003e500 V maximum voltage\u003c\/b\u003e suits a wide range of industrial systems, enabling compatibility with diverse equipment and power architectures.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eDirect part-number verification\u003c\/b\u003e ensures you’re selecting the right component for your application—use 3RH1921-1EA11 to confirm fit and function.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eDesigned for service, maintenance, and replacement\u003c\/b\u003e projects, making it a pragmatic choice for retrofits and panel upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eKey specifications at a glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eProduct Type: Auxiliary Switch\u003c\/li\u003e \u003cli\u003eAmperage: 10 A\u003c\/li\u003e \u003cli\u003ePoles: 2\u003c\/li\u003e \u003cli\u003eVoltage: 500 V\u003c\/li\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart Number: 3RH1921-1EA11\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003e practical applications and use cases\u003c\/h2\u003e\n\u003cp\u003eIdeal for industrial technicians and panel builders, this auxiliary switch is used to:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eSignal control circuits in machines and conveyors, ensuring safe and coordinated operation of primary contactors.\u003c\/li\u003e \u003cli\u003eIsolate and monitor control logic during maintenance, diagnostics, or replacement work.\u003c\/li\u003e \u003cli\u003eServe as a robust signaling interface in control cabinets where space, reliability, and quick replacement are priorities.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eHow it helps your operation\u003c\/h2\u003e\n\u003cp\u003eBy delivering a dependable, two-pole signaling path that handles up to 10 A at 500 V, this auxiliary switch reduces the risk of control faults and unplanned downtime. It’s a practical choice for technicians who demand predictable behavior in control circuits and a straightforward, compatible replacement part when servicing Siemens-based automation hardware.\u003c\/p\u003e \u003ch2\u003eCompatibility and support\u003c\/h2\u003e\n\u003cp\u003eUse the part number 3RH1921-1EA11 to confirm compatibility with your application requirements and panel design. If you’re unsure about the fit, we can help ensure the auxiliary switch matches your system’s specifications—\u003cb\u003eNeed help matching a part number or confirming compatibility? Message us and we'll help.\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46415554609314,"sku":"3RH1921-1EA11","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-3rh1921-1ea11-auxiliary-switch-10a-2-pole-500v-937.webp?v=1789167983","url":"https:\/\/www.ampstate.com\/products\/siemens-3rh1921-1ea11-10a-2p-500v-auxiliary-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}