RCBOs type B grant protection to persons and machineries in presence of DC current and high frequency AC fault current. Among the several types of RCBOs, type B provide the upmost level of protection.
Some applications’ examples are: electrical installations protecting elevators, escalators, welding machines, electro-medicals’ instrumentation, ventilation systems, PV systems, e-mobility charging stations.

The brand new RCBOs type B 3P+N from Italclem are in just four and a half DIN modules, therefore extremely compact compared to the other solutions available in the market.

Italclem’s range includes AC-DC sensitive RCBOs for DIN rail mounting which are in compliance with VDE 0664 Part 20 and 200. These items have two different characteristics of the tripping frequency course:

• NK version: devices with the NK suffix are specially designed for use in electrical installations where reliable fire protection over a wide frequency range is required. These items are in compliance with the requirements of VdS Directive 3501 in respect of fire protection up to 100kHz (within the range of the switching frequency converters).
• SK version: devices with the SK suffix are suitable for applications in electrical installations where particularly high leakage currents within the range of the switching frequency of frequency converters are to be expected and no fire protection is demanded. Due to an increased insensitivity in the upper frequency range, unwanted tripping can largely be avoided.

RCBOs’ mechanism is trip-free, that is the RCBOs can also trip when the lever is held in ON position.
All RCBOs are equipped with a visual indicator which discriminates residual current tripping (blue) from overload tripping (transparent) and with a green led signaling that the voltage is sufficient for product’s functioning as type B.
All products must be power supplied from the power side. Furthermore “cage” type terminals facilitate connection both through conductors (up to 35 mm² rigid and 25mm² flexible) and through busbars (both pin or fork types).