illegal current protection switch is used as life protection switch against dangerous illegal currents and fire protection switchy. The importance of using illegal current protection switch was made compulsory by using the Electrical Internal Installation Regulation. (Amendment dated 25.10.1996)

The current on the phase on the electrical line returns over the neutral. If some of the current outgoing current is transmitted to the soil, that is, if the total current does not return over neutral, we can talk about the presence of leakage current in the system. A system with illegal current has the risk of creating a fire in the installation with the risk of murmuring for us.

300MA and 30MA values ​​

In the tests performed according to the IEC 364 standard, it has been proven that the leakage current at a level of 300mA to be found between a 4mm openness; Powder will cause partially -like partial small conductive particles to heat up and flame over time. For this reason, the protection threshold of the illegal current protection switch to be used for fire protection is selected as 300ma.

30MA is the maximum leakage current value that can pass through human beings and will not harm human life. In the case of live end contact, illegal current flows from the human body to the soil. Assuming that the average resistance of the human body is 1666 ohm, the most basic formula of electricity is reached with a 50V maximum contact voltage with V = I*R. In other words, any system working over 50V constitutes the risk of murmuring for people.

Obligation to use illegal current protection switch in elevators

EN81-20 For elevators, the control circuits of voltage greater than 50V AC than the safety standard for elevators, with the control and floor indicators and the elevator cabin circuit should be protected by illegal current protection switch with 30ma sensitivity. However, one of the common problems encountered in the elevator systems is that the illegal current protection switch often throws frequently. Illegal current protection switch can from time to time by moving to Off position and cutting the energy of the electrical system. The main reason for this situation can be mentioned in 3 items.

a real illegal current has been formed in the elevator system

faulty grounding was made

illegal current protection switch is not selected in accordance with the elevator system.

In elevators, it is a common condition for leakage current protection switching switch. This problem is due to the characteristic of the speed control device of the elevator motor. Speed ​​control devices cause harmonic currents in electrical systems, currents containing DC current components, and these currents are perceived as leakage in the system by the illegal current protection switch. As a result, the illegal current protection switch causes a power outage by making unnecessary opening.

Harmonics and high -frequency parasites in the system due to the elevator drive cannot be detected by standard AC type leakage current protection switches. Sigma A type leakage current protection switches DC components, harmonics, high -frequency parasites detect and provide unnecessary service and ensure service continuity. In addition to Sigma A type leakage current protection switches, Sigma A type delayed leakage current protection switches to be used on the main panel and selectivity are also ensured, while service continuity is guaranteed against unnecessary tensiles.