MOLDED CASE CIRCUIT BREAKERS
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MOLDED CASE CIRCUIT BREAKERS

Circuit Breakers (Thermal-Magnetic) MCCB ■ CONTENTS Circuit Breakers (Electronic) MCCB Types of Circuit Breakers 4 Parts of Circuit Breakers 5 Earth Leakage Protection Circuit Breaker (ELCB) 7 Earth Leakage Protection Relay 8 MCCB for Network Protection 9 MCCB for Generator Circuit 9 MCCB for Motor Circuit 10 Three-phase electronic circuit breakers 10 Single-phase thermal-magnetic circuit breakers 10 Utilization of Circuit Breakers in Direct Current Circuits Circuit Breakers Protecting Capacitor Circuits 11 Breakers Used in LV Main Distribution Panels of 12 Detailed Calculation of Short...

MOLDED CASE CIRCUIT BREAKERS Thermal-Magnetic Circuit Breakers • ■ standard, □ upon request. • <3> For serial connected two poles of the breaker. • © see technical characteristic tables for products with value. • © les : 0 -1 - CO -1 - CO test (0 : Open maneuver, CO : Close - Open • (2) leu: O-t-CO test (O: Open maneuver, maneuver, t: Waiting duration)

MOLDED CASE CIRCUIT BREAKERS • © Accessories can be easily mounted by the user by opening the front cover of circuit breakers. (Plug-In) • ® 800A'de 500-800A thermal adjustment area is standard • ® Value at 240V- for F01 - F02 type breakers Note: F21 and F31 type of circuit breakers are manufactured as with fixed thermal magnetic or adjustable thermal-magnetic ((5-10)ln) depending on

MOLDED CASE CIRCUIT BREAKERS Electronic Circuit Breakers • 0 As an additional protection against short circuit currents in Federal electronic circuit breakers, mechanical opening mechanism operating with magnetic field of the short circuit current has been placed on each phase. In this way, mechanical opening unit is tripping in over currents such as short circuit and risk of not tripping in case of electronic card failure has been eliminated. This is a great advantage of Federal circuit breakers. • □ standard, □ upon request. • CD see technical characteristic tables for products with value...

MOLDED CASE CIRCUIT BREAKERS Description label ON-OFF operation Operating handle Trip button Electronic control unit Device protected All the circuit breakers are equipped with over current releases. However, under voltage and shunt trip-release coil is not a standard accessory and added to the circuit breaker as per requirement. Over Current Option: All the values exceeding rated current value are called over current. Operating Principle of the Circuit Breaker: The most important function of the circuit breaker, in addition to opening-closing the circuit, is to protect the circuit under...

MOLDED CASE CIRCUIT BREAKERS (For protection under short circuit conditions) Magnetic area Moving contact Another function of the breaker is to protect the connected circuit against short circuits. Short circuit may occur as a result of contact of phases with each other or contact of phase-ground. Since a very high current shall pass through the cables in case of short circuit, system energy should be broken in a shorter time due to thermal protection. Breaker should perform instant opening to protect load it is connected to. The part fulfilling this function is a mechanical opening...

MOLDED CASE CIRCUIT BREAKERS Magnetic area Magnetic force Current direction Arc Extinguisher Cell (Separator): Separators are used to extinct the arc which is formed during operation of the breaker operating under energy. While moving contact is separated from fixed contact, current continues to flow between contacts for a while and this is called arc. This arc should be extinct in a very short time. Extinction of Arc: Arc is pushed towards separators due to magnetic field formed around the arc. In this way, arc is extended and becomes slim and broken off between separator plates...

MOLDED CASE CIRCUIT BREAKERS EARTH - LEAKAGE CIRCUIT BREAKER (ELCB) the protection can be achieved by controlling of shunt trip coil or under voltage release coil on the mounted circuit breakers, such as protection can be achieved by residual current protected type circuit breakers. Toroidal transformer, sensors relay and shunt trip are placed into circuit breakers. Without the need any external accessory connector can be installed only by connecting the input and output terminals. For leakage current protection selectivity, the leakage current threshold and leakage current time delay can...

MOLDED CASE CIRCUIT BREAKERS Important considerations in assembly: - Cables should pass through center of the toroidal transformer to the extent possible. - Toroids with appropriate diameters should be utilized. Utilization of toroids with higher diameters shall reduce sensitivity. Different Connections: If cables cannot pass through a toroid with high diameter, several toroids can be connected parallel to the same ground detection relay. However, this transaction reduces sensitivity of the device and increases opening threshold. If it is not possible to place the toroid around primary...

MOLDED CASE CIRCUIT BREAKERS Network Protection Breakers: Big powerful motor, load with starting resistance dont exist in main networks and lines are quite long. LV circuit breaker should open in short circuit currents to occur by the end of these lines. Therefore, magnetic adjustments of the circuit breakers utilized in main lines should be between (4 - 8)xIn. Three-phase thermal-magnetic circuit breakers / For protection of main networks: Rated current adjustment area I1 (A) Short circuit opening current I2 (A) 600A 10 In Order code Order code Order code : Please enter amper value...

MOLDED CASE CIRCUIT BREAKERS Motor Circuit Protection Breakers: Motors draw very high current for a short time during first start-up. In order to ensure operating continuity and to protect the system, magnetic adjustment area of the breaker to be selected should be (8 - 12)xIn. Three-phase thermal-magnetic circuit breakers / For protection of motor circuits: Nominal current In (A) 16 - 20 32 - 125 160 Rated current adjustment area I1 (A) (0,7-1)In (0,7-1)In (0,8-1)In Short circuit opening Type current I2 (A) 200A F21 10 In 25kA 10 In 200A 10 In Order code Order code Order code : Please...