Core Features "SQL361" Series & Functional Design: The "SQL361" denotes Siemens’ precision medium-duty linear actuator series, optimized for reliable control of mid-sized hydronic valves in semi-critical commercial and light industrial systems. The "B50" model is a 24V AC-powered linear actuator with a 20 mm stroke length and 900 N thrust rating (≈91.8 kgf)—ideal for 2-way/3-way hydronic valves (e.g., commercial HVAC zone main valves, light industrial process fluid valves) where 24V low-voltage power, high thrust, and stable performance are critical. Advanced Control Modes & High-Precision Feedback: Equipped with professional-grade control to handle dynamic flow scenarios: Modulating control (0–10V DC / 4–20mA input): For precision regulation (e.g., commercial multi-zone temperature control, light industrial fluid dosing), enabling valve adjustment with ±0.8% positioning accuracy—essential for stable pressure, flow, or temperature in semi-critical systems. On/off + fail-safe control: For emergency isolation (e.g., system leaks, power loss) or basic flow on/off, with configurable fail-safe positions (open/closed) and rapid actuation (≈5.7 seconds/full stroke) to minimize operational risks. It includes built-in analog position feedback (0–10V DC / 4–20mA) and digital status signals, compatible with commercial BMS or light industrial PLCs for real-time monitoring and diagnostics. Durable & Robust Construction: Engineered with a reinforced aluminum alloy housing (corrosion-resistant, hard-anodized) and a balanced weight of 1.8 kg (3.97 lbs), suitable for direct valve mounting (via standard ISO 5211 flange) or bracket installation in commercial HVAC mechanical rooms or light industrial skids. The housing features IP54 protection (dust-tight, water-resistant), withstanding commercial dust, mild industrial contaminants, and moisture—ideal for indoor commercial and light industrial environments. Safety & Reliability Features: Built with multi-layer safeguards for long-term operation: Dual overthrust protection: Electronic monitoring (900 N max continuous thrust, 1200 N peak) and mechanical thrust limiters prevent damage from jammed valve stems (e.g., sediment blockage, process residue), avoiding actuator or valve failure. Enhanced thermal & electrical protection: Shuts down the motor if internal temperatures exceed 80°C; includes short-circuit, reverse polarity, and surge protection to safeguard against electrical faults in low-voltage control systems. Wide voltage tolerance: Accepts 24V AC (50/60 Hz) input with ±15% fluctuation tolerance, ensuring stability in systems affected by building or industrial load changes. Seamless Integration & Installation: Designed for plug-and-play compatibility with Siemens commercial controllers (e.g., Desigo CC) and third-party BMS/PLCs via standard 0–10V DC / 4–20mA signals. It includes a standard ISO 5211 flange (fits most mid-sized hydronic valves) and heavy-duty wiring terminals (3 mm² max), with tool-free calibration via built-in buttons—reducing installation time by up to 25%. Typical Applications SIEMENS Actuator SQL361B50 is engineered for precision medium-duty linear control of mid-sized hydronic valves—ideal for scenarios needing 900 N thrust, 20 mm stroke, and 24V power in commercial HVAC or light industrial systems. Key use cases include: Commercial HVAC Zone Main Valves: Controlling mid-sized 2-way/3-way main valves in commercial HVAC zoning (e.g., office floor heating/cooling loops, hotel guest floor water mains). Modulating control adjusts flow to match zone demands, while IP54 protection withstands mechanical room dust—complying with EN 15513 (HVAC hydronic components) and ASHRAE 90.1 (commercial energy efficiency). Light Industrial Process Fluid Valves: Regulating mid-sized fluid valves in light industrial processes (e.g., food processing line supply, pharmaceutical rinse systems). Fail-safe control prevents process overflow, and corrosion-resistant housing resists mild industrial contaminants—complying with IEC 60534 (industrial valves) and GMP (good manufacturing practices). Commercial Boiler Feedwater Valves: Adjusting mid-sized feedwater valves in commercial boilers (e.g., hospital, hotel boilers). High thrust handles valve resistance, and thermal protection prevents overheating during peak load—complying with EN 12953 (boiler safety standards). Large Commercial Fan Coil Units (FCUs): Controlling valves in large FCUs for shopping malls, airports, or office lobbies. 24V low-voltage compatibility aligns with centralized BMS, and robust construction withstands continuous operation—complying with EN 14511 (air handling units and FCUs).