Core Features Plunger-Actuated Precision Sensing: Functions as a single-pole, double-throw (SPDT) basic limit switch designed for simple, reliable position detection in light-to-medium industrial applications. It uses a spring-loaded, non-roller plunger with a reinforced, rounded tip—engineered to trigger electrical contact actuation when pressed by moving parts (e.g., machine slides, workpieces, or door panels). This design is ideal for low-to-moderate cycle tasks like end-of-travel confirmation for small CNC axes, presence detection for assembly line components, or basic enclosure door monitoring. Standard Industrial Electrical Ratings: Rated for AC 230V (50/60Hz) and DC 24V, with a maximum switching current of 5A (resistive load) and 2A (inductive load). The SPDT configuration (1 normally open/NO + 1 normally closed/NC contact) supports flexible control logic: for example, using the NO contact to signal “position reached” and the NC contact to interrupt a “standby” circuit. This enables direct integration with PLCs (e.g., Siemens S7-1200), indicator lights, or small relays without requiring auxiliary power conditioning. Durable Design for General Industrial Use: Constructed with an impact-resistant thermoplastic (ABS) housing (UL94 V-0 flame-retardant rating) and a zinc-plated steel plunger. The housing includes a sealed internal structure to protect contacts from dust, oil, and humidity, while the plunger’s corrosion-resistant coating prevents rusting in damp or oily environments. The switch meets IP65 protection (IEC 60529), safeguarding against low-pressure water jets and dust ingress—suitable for non-washdown settings like manufacturing floors, material handling stations, or small machine enclosures. Consistent Actuation & Reliable Reset: The plunger features a 6mm stroke length and a stable return spring force (3.6N actuation force), ensuring ±0.1mm position tolerance for repeatable feedback. The rounded tip minimizes damage to delicate contacted parts (e.g., painted surfaces, plastic housings) while preventing jamming from debris buildup—extending both the switch’s lifespan and the integrity of the machinery it monitors. Simplified Installation & Space Efficiency: Supports surface mounting via integrated M4 screw holes, with a compact, low-profile design (50mm × 35mm × 28mm) that fits in tight spaces (e.g., machine frames, conveyor side rails, or control panel enclosures). The terminal block is clearly labeled (NO/NC/Common) for intuitive wiring, accepting 0.5–1.5mm² wires—reducing installation time and minimizing wiring errors for technicians. Global Compliance for Basic Applications: Meets essential industrial standards including IEC 60947-5-1, UL 508, and CSA C22.2 No. 14, ensuring compatibility with global electrical systems. It complies with basic machinery safety guidelines (EN ISO 13849-1, Category 1) for non-safety-critical position monitoring, making it a cost-effective choice for standard industrial use cases. Typical Applications The Siemens Switch 3SE3100-0D is engineered for simple, reliable position sensing in light-to-medium industrial environments, with core use cases including: Small Machine Slide End-Stop Control: Installed at the travel limits of compact CNC linear slides (e.g., benchtop milling machines, 3D printer X/Y axes, or small lathes). When the slide reaches its end position, it presses the plunger, activating the NC contact to cut power to the slide motor and the NO contact to trigger an “overtravel” indicator—preventing mechanical damage to the slide, tooling, or workpiece. Assembly Line Component Presence Detection: Deployed in electronic or mechanical assembly lines (e.g., PCB insertion, connector mating, or fastener installation) to verify that components are in place before processing. If a component is missing, it fails to actuate the plunger, keeping the NC contact closed to pause the machine—reducing defective parts and improving production quality. Conveyor Line Product Positioning: Mounted along lightweight conveyors (e.g., for packaging inserts, small electronic parts, or pharmaceutical vials) to align products before downstream processes (e.g., labeling, sealing). As a product passes, it presses the plunger, signaling the conveyor controller to adjust speed or trigger a stop—ensuring precise product alignment. Benchtop Equipment Cycle Confirmation: Used in benchtop tools (e.g., small injection molders, heat sealers, or manual press machines) to confirm the completion of a work cycle. When the tool’s moving component (e.g., mold clamp, sealer bar) reaches its fully extended position, it actuates the plunger, closing the NO contact to signal the operator (via an LED) or trigger a PLC to initiate cooling or part ejection. Small Enclosure Door Monitoring: Mounted on the access doors of small machine enclosures (e.g., sensor housings, control boxes, or benchtop equipment) to confirm that doors are fully closed during operation. If the door is opened, the plunger resets, opening the NO contact to pause the machine—preventing accidental contact with moving parts inside the enclosure.