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DKIH_3352_102J_Copper_3_Phase_Choke_Pressebild_1 DKIH_3352_102J_Copper_3_Phase_Choke_Pressebild_1

大电流扼流圈 DKIH



Electrical and electronic equipment must be protected against external interferences (immissions) and must not emit any interferences (emissions). For this purpose, the devices must meet the corresponding EMC requirements.

Current-compensated chokes

The current-compensated choke - also called common-mode choke - is a coil or inductance for limiting currents in electrical lines, for intermediate storage of energy, for impedance matching or for filtering. It is used in the field of power supplies for electrical and electronic devices in power electronics. SCHURTER offers current-compensated chokes for 2-, 3- and 4-wire circuits with different toroidal core materials.

Common mode attenuation

In electrical engineering, common-mode interference is the term used for interference voltages and currents on the connecting lines between electrical components that occur with the same phase position and current direction both on the forward line and the return line between these components. Signal and transmission paths with high common-mode rejection provide a remedy against such common-mode interference. Current-compensated chokes are ideally suited for this purpose. Such current-compensated chokes are used to attenuate asymmetrical (common-mode) interference. They can be found in switching power supplies, for example, which generate RF interference.

Nanocrystalline chokes for 1- and 3-phase applications on the printed circuit board

SCHURTER offers a wide range of current-compensated chokes for high current applications on printed circuit boards. The DKIH series is now available with nanocrystalline toroidal cores. These cores have an eight times higher inductance than the same chokes with ferrite cores. Due to the open design, the chokes are compact and light. They are ideal for suppressing EMC interference generated by power applications on the printed circuit board.

Like most electronic components, the power section is increasingly mounted on the PCB with discrete components. However, due to the high integration density required to achieve a compact design, thermal problems can arise due to the high currents on the PCB. EMC interference can affect adjacent modules due to the lack of spatial separation. Therefore, a compact filter on the PCB with discrete components is often the best solution. A current-compensated choke with capacitors is the most efficient measure for suppressing EMC interference.


The DKIH-1 series is designed for use in 1-phase AC or DC applications. Compact and lightweight, the current-compensated chokes are easy to install on the printed circuit board and are contacted by means of THT (through-hole) contacts. The components have been developed and approved according to IEC 60938, UL 1283 and CSA 22.2 no. 8. The nominal voltages are 300 VAC (IEC, UL), 250 VAC (CSA) and 425 VDC for all variants.


The DKIH-3 series is suitable for 3-phase applications with a rated current of 10 A to 50 A. The current-compensated chokes comply with the IEC 60938 standard. With a rated voltage of 600 VAC, they are suitable for most applications.


The new DKIH-4 series is suitable for 3-phase applications with neutral line at rated currents from 10A to 40A. Compact and lightweight, the current-compensated chokes are easy to install on the PCB. The contacts are made by means of through-hole contacts (THT). The current-compensated chokes comply with the IEC 60938 standard. With a rated voltage of 500 VAC or 760 VAC, they are suitable for almost any application.

All chokes of the DKIH series are designed for a wide temperature range from -40 °C to +100 °C. The DKIH series is suitable for almost all applications. In addition to the standard products, customer-specific pin configurations or versions can be created on request


Compact EMC solutions require the use of state-of-the-art materials and many years of experience in power electronics in order to optimally cover all customer requirements.

Herbert Blum, Product Manager, SCHURTER AG





SCHURTER的产品与服务符合最高质量要求,因为SCHURTER应用了质量-环境-安全管理系统,如ISO 9001、ISO 14001、 ISO 45001、六西格玛方法和EFQM卓越模型。所有产品均实行国别测试标签,如德国电气工程师协会(VDE)、欧洲标准电器认证(ENEC)、UL、国家强制性产品认证(CCC)等。此外,由于集团各公司和分销商的国际合作网井然有序,客户可从卓越服务和交货期短中获益。

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