Model SZW26/LW2620 — 3NO3NC ONOFFON Dual Power Changeover Switch, 3 Positions, 64mm Panel Why choose this switch Simplifies safe, manual transfer between two power sources: designed as a dual power changeover (ONOFFON) switch for straightforward selection of source A, off, or source B. Provides flexible circuit control: the 3NO/3NC contact configuration enables simultaneous switching of multiple circuits or control lines without extra relays. Ideal for control panels and compact installations: engineered for panel mounting with a 64 mm installation diameter for a neat, professional finish. Key features and benefits Model: SZW26 / LW2620 — clearly identified for compatibility with existing equipment that specifies these series. Contact configuration: 3NO + 3NC — three normally open and three normally closed contacts give you flexible wiring options and the ability to change several circuits at once. Switching pattern: ON — OFF — ON (three positions) — three distinct positions (source A, neutral/off, source B) for simple, unambiguous operation. Function: Dual power changeover — purposebuilt to select between two power supplies or to route control circuits as needed. Panel size: 64 mm mount — designed to fit a 64 mm panel cutout for standard control panels and instrument boards. Three gears / three positions — tactile, defined positions reduce the risk of partial connection and improve operational clarity. Compatibility and practical notes Fits panels requiring a 64 mm diameter mounting hole; suitable for control panels, switchboards, and equipment enclosures that accept SZW26/LW26 series operators. 3NO/3NC contacts suit common wiring arrangements used in industrial control, generator transfer, and machine power selection. Confirm electrical ratings and wiring diagrams with your system requirements before installation. Manual, mechanical operation provides simple, reliable switching without electronic interface requirements. Typical applications Generator / mains transfer: Manually select mains power or backup generator power, with a clearly defined OFF position for safe maintenance isolation. Industrial control panels: Route control power or signal circuits between two sources or states, using the 3NO/3NC contacts to control multiple lines at once. Machinery and equipment: Provide operatorselectable power or function modes (e.g., test, run, alternate feed) where a simple, robust selector is required. User guidance Verify panel cutout and mounting requirements (64 mm) before installation. Plan wiring to take advantage of the 3NO and 3NC contacts for simultaneous circuit switching or interlocks. Confirm that the switch's electrical ratings (voltage/current) match your application; consult product datasheet or supplier for full technical specifications if . What makes it useful Clear threeposition operation with dedicated OFF center reduces ambiguity and helps prevent accidental crossconnection. Multiple contact sets (3NO/3NC) mean fewer additional components and simpler wiring when changing more than one circuit. Standard panel size and familiar ONOFFON layout make the SZW26/LW2620 an easy dropin for upgrades or panels that require manual dualpower changeover.