Multiphase operated or frequency-controlled electronic equipment such as cranes, pumps, fans, compressors, vibrators, charging stations for electric vehicles or also photovoltaic systems can also cause smooth DC residual currents in the event of a fault. All-current sensitive residual-current circuit-breakers are also the optimal protection when consumers with operating frequencies up to the kilohertz range are used. They are specified by many standards and are an important contribution to safety when using electricity, especially on construction sites. We offer the Type B RCCB in SK and NK versions. If no fire protection is required or desired, we recommend the Type B SK for maximum system availability. If fire protection is required, the Type B NK must be used.

Doepke has developed the EV (electric vehicle) model of its DFS RCCB especially for charging electric vehicles. These circuit breakers are VDE-certified according to IEC 62955, detect smooth DC residual currents and trip at 6 mA DC. By using this product, you can prevent the summation current transformer’s core from becoming pre-magnetised (a phenomenon known as “blinding”). This not only protects the RCDs used at this point, but also any upstream type A and type F RCDs. The DFS 4 A EV NA was also specially developed for use in charging units for electric vehicles. In addition to detecting 6 mA direct currents, it also offers an ­emergency stop function. In the event of danger, one or even several charging points can be switched off centrally at the push of a button. This ensures additional safety in public areas, for example.

The DFL 8 is a circuit-breaker with residual current trip (CBR). It is used in large cranes on building sites, in hospitals with MRI scanners, or in complex supply systems with high shortcircuit current in purpose-built buildings and industrial facilities. This specialist offers residual current protection up to a rated current of 250 A. The circuit-breakers with residual current protection are compact devices with an integrated auxiliary switch and terminals for large wire crosssections of up to 185 mm2. They have a high shortcircuit switching capacity and an adjustable response delay. The thresholds for instantaneous and short-time delayed overcurrent trip are adjustable.

The task of miniature circuit breakers is to automatically disconnect circuits in order to protect lines and connected devices. After disconnection, they can be manually reactivated without the fuse.

IEC (International Electrotechnical Commission) and UL (Underwriters Laboratories Inc.) are international standardisation organisations for standards in the field of electrical engineering and electronics. In most countries, either IEC or UL standards are valid. Both standards differ significantly. Doepke has miniature circuit-breakers of both standards in its product portfolio.

NEW: The DFS 4 040-4/0,01-A

Where humans and water come into contact, 10 mA RCCBs are required. 2-pole switches are available from 16 A to 40 A, while 4-pole switches were previously only available up to 25 A. The popular DFS 4 is now also available in a 40 A version - the ideal choice for protecting pools, jacuzzis and other facilities where electricity, water and people come together.

• The IEC standard 60364-7-701 describes: For protection in wet rooms, personal protection of ≤ 30 mA is required

• For example, in swimming pools and Jacuzzis, motors for pumps might require rated currents in the range of 40 A

• The 10 mA version provides an increased protection level