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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.

1,2,3,4 poles

3kA,4.5kA,6kA,10kA,16kA Breaking Capacity

Rating from 0,5A to 125A

B, C,D curve tripping characteristics

Type AC and DC

Safety device

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

Contact Info

P: +98 21 8831 7853
F: +98 21 8831 7854
No 64 . South Iranshahr St.,Tehran, IRAN

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