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).