Sigma Miniature Circuit Breakers (MCB) are manufactured in Türkiye with short-circuit breaking capacities of 4.5kA, 6kA, 10kA, and 15kA, in compliance with TS 5018-1 EN 60898-1 and IEC 60947-2 standards as well as CE norms. Thanks to a wide range of accessories based on demand, motor operating mechanisms, shunt trips, auxiliary contacts, and undervoltage releases can be added to Sigma Miniature Circuit Breakers when needed. 3 Main Functions of Miniature Circuit Breakers: Protection against overload currents Protection against short-circuit currents Opening and closing the circuit / Circuit switching

A Residual Current Circuit Breaker is a life-saving protective device that detects current imbalances in electrical circuits and disconnects the circuit within milliseconds in the event of an electrical leakage. Its primary function is to measure the current difference between the phase and neutral conductors in the electrical installation, protecting individuals against electric shock and structures against fire risks caused by leakage current. Making a difference with domestic manufacturing technology, Sigma Residual Current Circuit Breakers safeguard human life against direct or indirect contact with electrical leakages while ensuring life and property safety by preventing fire risks arising from insulation faults. Fully compliant with TS EN 61008-1 standards and CE norms, Sigma Residual Current Circuit Breakers combine quality with the power of domestic engineering. New Sigma 10 mA Threshold Residual Current Circuit Breaker The new Sigma 10 mA threshold Residual Current Circuit Breakers are specially designed to protect people from electric shocks in high-conductivity water environments such as swimming pools, ornamental pools, Turkish baths (hamams), and saunas. If a person swimming in water is exposed to a current level of 15 mA - 20 mA, their muscles lock up, rendering them unable to move. This limit, known as the "Let-Go Threshold," is around 10 mA for an average adult. The new Sigma residual current circuit breaker cuts off the power even before reaching this critical 10 mA threshold—at just 7-8 mA levels—ensuring complete safety in high-risk environments involving water.

Sigma Surge Protection Devices (SPDs) are precision electrical protective devices designed to safeguard connected equipment, power grids, and electrical installations against lightning-induced and internal transient overvoltages. Manufactured in compliance with the TS EN 61643-11 standard, Sigma Surge Protection Devices deliver high performance with their capability to suppress surge currents up to 100kA and overvoltages up to 1.4kV.

An Impulse Relay is a switching device used to control lighting circuits from multiple locations. While enabling users to control connected lighting systems via push buttons (momentary switches), it provides cost-effective and simple solutions for illuminating large spaces. Thanks to its special internal switching mechanism, pressing a push button once toggles the lighting circuit from ON to OFF if it is open, or from OFF to ON if it is closed. This switching function can be conveniently performed from multiple points using push buttons.

Sigma Moulded Case Circuit Breaker Series are manufactured in Türkiye in 1, 2, 3 and 4 pole configurations across nominal currents from 16A to 1600A, in compliance with the TS 1058 EN 60947-2 standard and CE norms. Also known as circuit breakers, the primary function of thermal-magnetic moulded case circuit breakers is to provide protection against potential short-circuit and overload conditions, in addition to switching the circuit on and off. In Sigma Moulded Case Circuit Breakers, the service short-circuit breaking capacity Ics which indicates that the circuit breaker can continue to operate without performance degradation following a short circuit is 100% (Ics = 100% Icu). The housings and covers of Sigma Moulded Case Circuit Breakers are manufactured from BMC (Bulk Moulding Compound) material, featuring high dielectric properties, as well as high resistance to temperature and impacts.

As one of the most critical protection equipment for electrical installations, Earth Leakage Protection Relays protect living beings against electric shock and fire hazards in the event of potential leakage current risks. Sigma Residual Current Detection Relays operate synchronously with LV circuit breakers, shunt trip coils, and toroidal transformers to provide comprehensive protection against leakage currents. Thanks to its extensive toroidal current transformer portfolio, Sigma Elektrik enables the easy selection of the most suitable product for the technical requirements of any project.

Air circuit breakers act as the main breaker in electrical systems, effectively protecting electrical equipment against overload currents, short-circuit currents, and earth faults. They are ideal for safe and efficient use in power plants, industrial facilities, mines, and smart building distribution systems with high energy consumption. Sigma Air Circuit Breakers are manufactured in compliance with the TS EN 60947-2 standard and CE norms. Offering fixed or draw-out type options according to project requirements, along with motorized or manually operated models, they provide safe and flexible usage opportunities in diverse electrical systems. Thanks to their LSIG Protection, Sigma Air Circuit Breakers provide superior protection in your system with the following features: Long Time Delay (L): Long-term inverse time-delayed overload protection Short Time Delay (S): Short-term delayed overcurrent protection Instantaneous Tripping (I): Tripping function for short-circuit currents Ground Fault Delay (G): Earth fault protection New Sigma 42 kA SCA/SMA Series Thanks to their much smaller and more compact dimensions compared to standard power breakers, they allow you to save valuable space in your panels. With smaller dimensions and an optimized design, they enable you to develop more cost-effective solutions without compromising on quality. Sigma Open-Type Circuit Breaker Accessories Opening Coil: Used to remotely open the open-type circuit breaker. Closing Coil: Used to remotely close the open-type power switch. Instantaneous Undervoltage Coil: Opens the open-type power switch when the voltage drops below 70% of the operating voltage. Delayed types are available. Delayed low voltage coil + Closing Coil + RTC switch combination (SRTC): When performing a transfer operation on open-type power switches, the low voltage coil and the closing coil must not be activated simultaneously. To prevent this situation, it is recommended to use a delayed low voltage coil + closing coil + RTC switch combination. Motor Mechanism: Enables the circuit breaker to be opened and closed remotely or to be re-energized after tripping due to a fault. Mechanical Interlocking: A safety system that prevents two open-type power circuit breakers from closing simultaneously, thereby preventing the collision of different power sources (such as mains and generator).

Sigma Automatic Transfer Switches are electromechanical disconnectors that automatically manage the transfer between two power sources. Equipped with an internal electrical interlocking system, they prevent one power source from engaging while the other is active. In the event of an outage in the primary energy source feeding the load, they execute the transfer between the two sources, ensuring uninterrupted power to the system. With Sigma Automatic Transfer Switches, transfer operations can be performed between Grid-Grid, Grid-Generator, Grid-UPS, Generator-Generator, and similar configurations. They are reliably used in facilities where power interruptions can cause significant financial and operational losses—such as factories, plazas, shopping malls, hospitals, airports, and metro and railway stations.

Sigma Horizontal Fuse-Switch Disconnectors are electrical circuit protection and control devices that, when used with NH fuses, not only manually open and close the circuit but also safely interrupt the circuit in the event of any short-circuit or overload current. Sigma Horizontal Fuse-Switch Disconnectors are manufactured in compliance with TS EN 60947-3 standards and CE norms. The housing material consists of a thermoplastic material resistant up to 960 °C, and the current-carrying parts are made of 99.9% pure electrolytic copper.

Sigma Vertical Fuse-Switch Disconnectors are manufactured for use with NH blade fuses in sizes NHC00, NH00, NH1, NH2, and NH3 up to 630 A, in compliance with the TS EN 60947-3 standard and CE norms. When used together with NH blade fuses, vertical fuse-switch disconnectors ensure the safe interruption of nominal currents under load and provide protection against overcurrents. Offering high performance and easy installation, Sigma Vertical Fuse-Switch Disconnectors provide the user with a highly reliable solution, low cost, and time savings.

Sigma NH Blade Fuses belong to the fusible wire fuse group and ensure protection against overload currents and short circuits through the thermal melting and multi-point severance of the internal wire. Quartz sand fills the gaps between the severed parts, completely cutting off electrical conduction to provide the necessary protection. Enhanced safety is achieved with the steatite body material, which is extremely resistant to short circuits, pressure, and high temperatures. Thanks to the dual-indicator design, the deactivation of the NH fuse can be easily observed, thereby ensuring reduced downtime and lower costs.

Motor Protection Switches are manufactured in compliance with TS EN and European standards, featuring compact dimensions and reliable operating performance. With a breaking capacity of up to 100 kA, they safely protect motor circuits and electrical installations without requiring an additional protective switching element, thereby offering more economical solutions and space savings in control panels. With their adjustable thermal current range, they provide optimum solutions for various applications. In the event of any overcurrent in the system, they trip the circuit very quickly to prevent motors from sustaining damage. A Motor Protection Switch is an electrical control, command, and protection element designed to protect electric motors against overload currents (thermal current), short-circuit currents, and phase failure, as well as to manually switch electric motors on and off. Sigma Motor Protection Switches are manufactured with adjustable thermal settings in the range of 0.1 A to 80 A, short-circuit breaking capacities of up to 100 kA, and provide convenience in applications through a wide range of accessories. Motor Protection Switches are selected according to the power of the motor they will protect, the motor nominal current value, and the operating voltage. Sigma Motor Protection Switches protect the motor system against overcurrents by acting like a circuit breaker with their thermal and magnetic release units. The fact that they provide fast-acting tripping and phase-loss protection constitutes the difference between them and thermal-magnetic protection elements such as circuit breakers or miniature circuit breakers (MCBs).

Sigma Thermal Relays are manufactured in compliance with the TS EN 60947-4-1 standard, with current ratings ranging from 0.16 A to 630 A. Serving as circuit protection elements, Thermal Overload Relays are designed to protect asynchronous motors against overload currents in accordance with their current-time characteristics. While proper operation can be verified via the built-in test button, the option for automatic or manual fault reset also provides flexibility for the user. Manufactured with an adjustable thermal range, these relays are additionally ambient-temperature compensated. Sigma Thermal Relays can be direct-mounted to contactors or used independently using a 35 mm DIN rail adapter. Sigma Thermal Relays offer safe motor protection along with a compact and economical starting solution.

Sigma Low Voltage Contactors are manufactured in compliance with the TS EN 60947-4-1 standard. With a broad product portfolio, they offer suitable solutions to meet the requirements of diverse industrial and commercial applications. Sigma Elektrik contactor range includes 3-pole and 4-pole standard power contactors, 6-pole and 8-pole reversing contactors, mini contactors providing space savings inside control panels, modular (silent) type contactors featuring low-noise operation, and common-coil contactors with a wide coil operating voltage range suitable for both AC and DC applications. With their exceptionally high switching endurance (electrical and mechanical life), Sigma Contactors operate trouble-free over long service lives in industrial facilities. In addition to the auxiliary contacts provided as standard on the contactor, auxiliary contact accessories offer flexible solutions for system requirements while maintaining compact dimensions to save panel space.

Manufactured using state-of-the-art technology at Sigma Elektrik facilities, current transformers are designed to perform precise measurements for energy analyzers, multimeters, ammeters, power factor correction relays, protection relays, and all other measuring devices used in industry. Particularly with split-core (removable) current transformers that can be easily installed without interrupting the power supply, operational losses caused by downtime can be prevented. Sigma Elektrik offers a comprehensive range of current transformers tailored to all applications and requirements in industrial facilities. Products are manufactured in compliance with TS EN 61869-2 standards. Current transformers included in Sigma Elektrik's product portfolio: Standard type current transformers Sealable type current transformers Busbar type current transformers Mini type current transformers Split-core type current transformers Ring type current transformers This variety provides reliable solutions for diverse industrial applications regarding the measurement and management of electrical current.

Cam switches are mechanical switching devices operated by a rotational action. They are widely used for controlling electrical circuits in industrial facilities, electrical switchboards, large electrical machinery and residential and commercial buildings.

Digital measuring instruments measure electrical parameters in your facility with high precision and reliability. Digital Voltmeters and Digital Ammeters Digital voltmeters measure voltages, while digital ammeters measure currents, performing digital processing, conversion, and display. Additionally, they can compare input values to adjust settings, transmit data, and perform other functions. Digital Multimeter Sigma multimeters are manufactured in compliance with TS EN 60051-2 standards and measure the electrical parameters of the connected network. Power Meter Sigma power meters are manufactured in compliance with TS EN 60051-2 standards and measure the electrical parameters of the connected network. With their communication feature, they allow energy to be monitored and recorded. Energy Analyzer Sigma multi-functional network analyzers are manufactured in compliance with TS EN 60051-2 standards and measure the electrical parameters of the connected network. With their communication feature, they allow energy to be monitored and recorded.

Sigma industrial relays are switching equipment that perform electrical circuit control. Operating via an electromechanical system, the most common reason relays are used in electrical and electronic circuits is to control high currents using low currents.

Sigma new-generation reactive power control relays are technological devices designed to switch capacitors and shunt reactors in and out of the circuit to balance active and reactive power ratios according to facility requirements. They are offered with features that provide complete and comprehensive solutions for all compensation needs in balanced or unbalanced loads, rapidly fluctuating or normally varying loads, facilities requiring SVC (Static Var Compensator), and installations operating outside inductive and capacitive limits. Sigma reactive power control relays analyze the system and its requirements. Consequently, if there is a fault such as a polarity error in the system, they internally adjust the connections; in cases where the number of steps or the power rating of capacitors and shunt reactors is insufficient, they provide recommendations to the user via the LCD screen.

The Sigma SVC System is an innovative solution developed to meet the needs of modern facilities featuring rapidly changing reactive loads and heavy capacitive characteristics, where conventional compensation using capacitor steps falls short. Sigma Elektrik easily meets the reactive power compensation needs of businesses and factories with its 5, 10, 20, and 50 kVAr Sigma Elektrik Inductive Load Drivers.

Shunt reactors are compensation components used to balance capacitive loads by creating an inductive effect when engaged by a reactive power control relay as capacitive load increases. The capacitive effect caused by long underground power lines, UPS units, computers, electronic ballasts, and LED lighting is compensated and balanced through the use of shunt reactors. Sigma Shunt Reactors are manufactured in single-phase ratings from 0.25 kVAr to 10 kVAr, and in three-phase ratings from 0.25 kVAr to 50 kVAr.

Capacitors are used in facilities with inductive reactive loads—such as motors, transformers, and coils—to prevent drawing inductive reactive power from the grid and to avoid penalty charges. These capacitors are designed and implemented to compensate for the plant's reactive power under all conditions through various fixed or automatic applications based on load requirements. Sigma Low Voltage Power Capacitors offer reliable and long-lasting solutions for the reactive power needs of compensation systems, ranging from 0.25 kVAr to 5 kVAr in 230V single-phase capacitors, 0.5 kVAr to 50 kVAr in 400V, 415V, and 440V three-phase capacitors, alongside heavy-duty 525V capacitors from 10 kVAr to 30 kVAr.

Sigma Compensation Contactors are specially manufactured contactors designed for reactive power compensation systems. When capacitors are switched in and out in compensation systems, high inrush currents are generated. These currents can reach values high enough to damage the contacts of standard power contactors. Therefore, specialized compensation contactors capable of withstanding momentary high inrush currents must be used in compensation systems. The excessive current drawn during the initial energization of capacitors is reduced by current-limiting resistors before it reaches the contactor's main contacts. As a result, the contactor contacts are not exposed to the high currents generated during system switching, preventing both mechanical and electrical stress. Furthermore, the V0 flame-retardant heat-shrink tubing used on the outer surface of the current-limiting resistors eliminates any risk of fire during the passage of high currents. With Sigma Compensation Contactors, the compensation system achieves a longer electrical and mechanical lifespan.

The Sigma SCRC03 Reclosing Unit is an accessory that automatically re-engages the residual current circuit breaker (RCCB) to ensure system continuity whenever the breaker trips due to transient causes. Sudden surges in the electrical grid, transient voltage fluctuations, and harmonic components can be incorrectly detected by the residual current circuit breaker as a system leakage. Once these transient events pass, residual current is no longer present in the system. When a transient event trips the breaker, the Sigma SCRC03 RCCB Reclosing Unit waits for 10 seconds after the initial trip before automatically resetting the breaker. If the residual current persists, the RCCB trips again, and the Sigma SCRC03 waits 60 seconds before making a second reclosing attempt. If the residual current still remains, the third and final reset occurs at the 300th second. If the breaker trips again at this stage, manual intervention is required to resolve the fault in the system.

With their specialized internal design, the sound generated when the contactor contacts switch position is virtually silent. By absorbing noise during switching operations, modular contactors ensure maximum quietness in the operating environment. This feature makes them the ideal solution for spaces where comfort and silence are top priorities, such as hospitals, hotels, residential buildings, schools, and offices. With their long mechanical lifespan and high switching capacity, they are safely preferred as a core component of remote control and automation systems across a wide range of applications, from shopping malls to manufacturing facilities.

Current protection relay protects the circuits against overcurrents; voltage protection relay protects the devices against sudden increases or decreases in voltage and prevents damage to the devices. Sigma Single Phase Adjustable Current Voltage Protection Relay provides space advantage in the board, providing both current and voltage protection in a single device. In this relay, both current and voltage parameters as well as opening and closing times can be set individually, so providing protection suitable for all operating conditions. Advantages - Space saving in the board- Easy installation & time saving- Easy maintenance and repair- Monitoring over and under current/voltage faults on the display Areas of Use - Industrial facilities- Power distribution systems- Electrical boards- Medical devices- Protection of motors against current

Sigma Isolation Transformers ensure the safe operation of your devices by isolating the primary input voltage from the secondary. Sigma Isolation Transformers have fixed input and output voltages of 230VAC or 400VAC and are manufactured to CE compliant and IEC/EN standards.

Sigma Control Transformers provide safe operation in devices with 400V AC or 230V AC input voltage and 24V output voltage, and are manufactured in accordance with CE and IEC/EN standards.

Sigma Electronic Type Compact Circuit Breakers provide protection against overload and short-circuit currents via an electronic control unit. They offer faster detection and tripping compared to thermal-magnetic compact circuit breakers in cases of overload and short-circuit, and their thermal-magnetic setting ranges are wider. They are unaffected by ambient temperatures up to 60°C. Electronic compact circuit breakers measure the current in each phase separately. Sigma Electronic Compact Circuit Breakers start measuring above 30A. An alarm signal activates when the current reaches 95% of the rated current.  It indicates that the switch is close to its nominal current value. When it reaches 105% of the nominal current, the overcurrent signal activates. It indicates that the switch has reached its opening limit. Model-based product versions with short-circuit delay and earth fault protection features (LSIG protected) provide superior protection.

Leakage Current Protected Compact Circuit Breakers (Fire Protection Circuit Breakers) provide protection against leakage currents in addition to thermal-magnetic protection. Since they have an internal detection mechanism, they do not require a combination of an external toroidal current transformer, residual current detection relay, and trip coil. This minimizes the complexity of panel wiring, resulting in significant savings in both labor and installation space.

Ground fault protected circuit breakers incorporate the protective functions of both ground fault protection switches and circuit breakers. Thus, they provide protection against both overloads and short circuits as well as ground faults in a single compact device. Ground fault protected circuit breakers save on cost and space, as well as time due to their ease of installation.

Wide Range of AccessoriesTrip Coil: Used to remotely trip the circuit breaker (move it to the trip position). Remote tripping is achieved by supplying 220V to the phase and neutral terminals of the trip coil.Low Voltage Coil: Opens the circuit breaker when the voltage drops below 70% of the operating voltage.Motor Mechanism: Enables remote opening and closing of the circuit breaker or reclosing of a switch that has tripped due to a fault.Auxiliary Contact: Provides information on whether the circuit breaker contacts are open or closed.Alarm Contact: Sounds an alarm when the circuit breaker trips.

Premium Series Compact Circuit Breakers MLT, SLT, ULT, XLT Series Premium Series Electronic Compact Circuit Breakers MLE, SLE, ULE, XLE Double Break Short Circuit Breaking System  Sigma Premium Series Compact Circuit Breakers can safely interrupt high short circuit currents up to 150kA thanks to their Double Break short circuit breaking system and current limiting technology. This technology enables the switch to extinguish the arc formed on the arc extinguishing plates much more quickly and easily at the moment of circuit interruption by creating a high pressure increase in the area where these plates are located.  In addition to traditional technologies, the Double Break breaking system; In the Double Break breaking system, since the pair of movable rotating arms moves with a rotating system, the inertia moment on the movable arm is reduced. In such a system, the breaking operation will be very fast and easy, thus directly increasing the breaking performance.  As shown in the figure, during contact, the movable contact bar, which has a rotation axis at the center, and the rotor, which is connected to the switching mechanism via a movable connection pin at each end of the conductor, are held. When the current supply mechanism is manipulated, the connection pin causes the rotor to move in a circular motion, and then the moving contact arm rotates counterclockwise to open the connections. In contrast, when the contacts are to interrupt a high current in the instantaneous opening function, the movable contacts, previously directed by electromagnetic force, move in the opening direction, and the operation is completed by opening the contacts with the clockwise rotation of the rotor to which they are connected. The fixed contact holder is positioned facing each end of the moving contact bar, and the fixed conductor is placed along the side surface of the moving contact bar, creating a magnetic opening field. As a result, when a current flows, the opposing magnetic fields generated by the magnetic opening field intersect perpendicularly with the conductor arm of the movable contact bar and apply an electromagnetic force to the arm in the contact opening direction. The combination of the movable contact bar with reduced inertia moment and the more advanced electromagnetic thrust increases the switching speed.  Additionally, the magnetic flux from the opening field also intersects perpendicularly with the arc generated between the contacts during interruption, causing a repulsive force to move toward the arc-preventing plate. When the arc reaches the plates and is broken at an early stage, the current limiter (limiter) exhibits high performance.