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Sigma, which is one of the most leading Company in Turkish electromechanical Area, started its business with MCB(Miniature Circuit Breaker) in its own factory established in 1993 in Istanbul and continues to invest Turkish economy with its new projects improved with each passing day.
In Sigma Elektrik all the working process from planning to the marketing are carried out under the guarantee of ISO 9000 Quality Management System. Each product is produced properly according to the IEC, EN and International Standards and after making quality controls, the products are dispatched to the customers.
Today Sigma Elektrik produces Moulded Case Circuit Breakers, Miniature Circuit Breakers, L/V Contactors, LV Current Transformers and all low voltage switchgear components in its own factory in Istanbul/Turkey. Sigma which focuses on total quality management concept, aims to be one of the leading Brand in Turkey as well as throughout the world in accordance with short medium and long terms in 5 years.
For further information about Sigma please visit www.sigmaelektrik.com
L.V Moulded Case Circuit Breakers (MCCB)
Sigma Moulded Case Circuit Breakers are produced as 1, 3 and 4 poles from 25A up to 1600A according to IEC /EN 60947-2 and CE standards and used for protecting the circuits which have different characteristics like cable, motors, lighting, generators etc.
Rating From 25A- to 1600A
750v AC Rated Insulation Voltage
8kV Rated Impulse Withstand Voltage
25,36,50 and 70kA Rated Ultimate Short-Circuit Breaking Capacity
Thermal and Magnetic Adjustment
Miniature Circuit Breakers (MCB)
Miniature Circuit Breakers (MCB) are such devices that protect their connected circuits against short circuit and overload. In adition to this they fullfil closing and tripping functions as well. Sigma MCBs are produced as 3kA, 4.5kA, 6kA, 10kA and 16kA according to IEC/EN 60898-1 and comply with Europian Union Low Voltage directives 72/23/CE.
3kA,4.5kA,6kA,10kA,16kA Breaking Capacity
Rating from 0,5A to 125A
B, C,D curve tripping characteristics
Type AC and DC
Residual Current Circuit Breakers (RCCB)
Residual Current Circuit Breakers (RCCB) are used in order to protect the human life against hazardous electrical shock and prevent the fires caused from insulation failures by predetermining the insulation failures in system. Sigma RCCBs are produced according to IEC/EN 61008-1 and CE Standards.
2 and 4 poles
6kA and 10kA Breaking Capacity
25A, 40A,63A,80A,100A Rated Current
Sensitivity 30mA and 300mA
Delay and Without Delay Type
L.V Power Contactors
Low voltage contactors are produced according to IEC/EN 60947-4-1. They are used remotely to control and protect (in combination with thermal O/L Relays) electrical motors and other electrical Loads such as lamps, capacitors, transformers, pumps etc. When the contactors are used together with thermal O/L relays, they protect the circuits against overload current.
3 and 4 poles (opportunity to produce with 2NO+2NC contact when requested)
Current rating from 9A to 630A for AC3 (4..330KW)
Built-in 1NO+1NC Aux. contact from 9A to 85A
Built in 2NO+2NC Aux. contact from 100A to 630A
Thermal Overload Relays
Sigma thermal O/L relays are designed to meet the special protective needs of motor control circuits. Overload relays allow harmless temporary overloads without disrupting the circuit and they will trip and open a circuit if current is high enough to cause motor damage over a period of time. They can be reset once the overload is removed.
· Rating from 0.1A to 240A
· 6 Different frame size
· Tripping class 10A
· 1NO+1NC Aux. Contact
Motor Protection Switches
Sigma motor protection switches designed for overload induction motors protection against load and short circuit conditions.
Sigma motor protection switches provide effective solutions at affordable cost in different combinations to meet your every field motor protection needs.
Thermal and Magnetic Protection
Motor Rating from 0.02kw to 11kw
100kA for 0.02-4kw and 15kA for 5.5kA -11kw
Wide Range accessories
High Electrical and Mechanical Life