- Safe Torque Off (STO): A safety function that ensures motor torque is safely eliminated without switching off the entire power supply, used in emergency stop and functional safety systems.
- Safety of machinery: A discipline and set of standards focused on protecting people from risks associated with the operation of machines.
- Safety position switches: Devices used to detect the position or state of machine guards, doors, or hatches. They stop machine operation when a guard is opened.
- Safety technical data: Specifications and parameters describing the performance and safety characteristics of components, such as failure rates or diagnostic coverage.
- Safety-related applications: Control systems and components that are involved in maintaining or enforcing safety functions, such as emergency stops, guard locking, or monitoring.
- SASY60i: A modular busbar system that simplifies wiring and mounting of protection and switching devices in distribution panels.
- Sealing power: The minimum power required to keep a relay or contactor coil energized after it has been actuated.
- Second environment: An EMC (Electromagnetic Compatibility) classification referring to industrial environments with higher electromagnetic disturbances than residential areas.
- Selection aid: A tool or guide designed to help engineers choose the correct devices or components based on specific criteria such as voltage, current, or application.
- Separation galvanic: The isolation between two circuits that prevents current from flowing between them, typically achieved using optocouplers or isolation transformers.
- Shaft output: The mechanical power delivered by the rotating shaft of a motor or gearbox, defined by torque and speed.
- Sheet steel housing: Enclosures made from steel sheets, used to protect electrical and electronic components against mechanical damage and environmental factors.
- Shielding: The use of conductive or magnetic materials to block electromagnetic interference (EMI), improving the EMC of a system.
- Short-circuit currents: Abnormally high currents caused by a fault (short circuit), which can damage equipment and must be interrupted quickly.
- Short-circuit protective device: A device such as a fuse or circuit-breaker designed to disconnect the electrical supply during a short-circuit fault condition.
- Short-circuit releases: Fast-acting components within circuit-breakers that trip the device when short-circuit current is detected.
- Short-circuit strength: The maximum current a device or installation can withstand during a short-circuit without sustaining permanent damage.
- Shunt releases: Tripping devices in circuit-breakers that enable remote disconnection when a voltage is applied to a shunt coil.
- Shunt coil: An electromagnet that, when energized, creates a magnetic field that triggers the circuit-breaker’s tripping mechanism. It operates independently of the load current and is used for remote shutdowns, emergency stops, or automated disconnection systems.
- Signal tower configurator: A software or interface that allows users to design customized signal towers (e.g., light stacks), choosing colors, sound modules, and behavior.
- Single-phase motors: Electric motors that run on single-phase AC power, used in homes, small machines, and light industrial applications.
- Sinusoidal filter: A passive filter used in motor drive systems to smooth voltage waveforms, reduce harmonic distortion, and protect motor insulation.
- SL7/SL4 signal towers: Modular signal towers from Eaton, offering visual and acoustic indicators for machine status, faults, or process stages.
- Slip speed: The difference between the synchronous speed and actual speed of the rotor in an asynchronous motor, directly related to torque production.
- SmartWire-DT: A modular wiring and communication system that simplifies the connection of control components while enabling diagnostic and control data transmission.
- Soft starter: An electronic device that gradually increases motor voltage at startup, reducing mechanical stress and inrush current.
- Solid state relays: Switches with no moving parts, using semiconductors to switch electrical loads silently and with high speed.
- Special purpose relays: Relays designed for specific applications such as time delays, monitoring, or logic functions beyond general switching.
- Speed: A measure of how fast a shaft or motor rotates, usually in RPM (revolutions per minute).
- Spring-cage terminal: A type of terminal that uses spring tension to clamp the wire, providing a fast and reliable connection resistant to vibration.
- Standard auxiliary contact: Additional contacts mechanically linked to a main switching device to signal its status or control other circuits.
- Standard transformers: Transformers used to step up or down voltage levels or isolate circuits, built according to established norms.
- Star circuit: A method of wiring in which the three windings of a three-phase device are connected at a common neutral point.
- Star-delta: A starting method for three-phase motors in which they start in a star configuration (lower voltage) and then switch to delta (full voltage) to reduce starting current.
- Star-delta starter: A device or system that implements the star-delta motor starting method, often used with contactors and timers.
- Star-delta wiring: The cable connections required to implement a star-delta configuration in motor circuits.
- Start voltage: The voltage initially applied to a motor during startup, usually reduced to control inrush current.
- Starting current: The current drawn by a motor at the moment of startup, typically several times higher than the normal operating current.
- Starting torque: The torque a motor develops from rest, important for overcoming inertia in the driven load.
- Suppressor circuit: An electronic component or configuration that protects against voltage spikes, often used in relay and coil circuits.
- Switch position indication: A method of showing whether a switch or circuit-breaker is open or closed, using mechanical flags, lights, or electrical signals.
- Switch position indication circuit-breaker: A circuit-breaker that includes or supports external accessories to provide switch status feedback.
- Switch-disconnectors: Devices that combine the functions of a switch and an isolator, ensuring both operational switching and safe disconnection.
- Switching of capacitors: The process of connecting or disconnecting capacitor banks in a controlled manner to manage reactive power in electrical systems.
- Switching on three-phase motors: The procedures and precautions taken when starting three-phase motors, including voltage control and sequence logic.
- Synchronous speed: The theoretical speed of a motor’s rotating magnetic field, determined by supply frequency and number of poles.
- System-protective circuit-breakers: Circuit-breakers designed specifically to protect complete electrical systems, often with advanced tripping functions.
- System-protective trip block: A modular block attached to a breaker that adds protective functions such as thermal or magnetic tripping with configurable settings.
Published by Leonardo Tomás Cardillo
https://www.linkedin.com/in/leonardocardillo
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