B type Residual current devices

Residual current circuit-breakers for specific applications which ensure:

• The control and isolation of electrical circuits
• The protection of persons against direct and indirect contacts
• The protection of installations against insulation faults.

They conform to both the residual current device standard BS EN 61008 and to switch standards BS EN 60947-1 and BS EN 60947-3.

These RCCB B type residual current circuit-breakers provide specific protection of
three-phase installations and people even in the presence of DC fault currents on the
network generated by:

• Three-phase controllers and variable speed drives
• Three-phase battery chargers and inverters
• Three-phase backed-up power supplies

They are a requirement for three-phase supplied applications, when class l equipment installed downstream from the RCCB are likely to produce DC component fault currents (pure DC fault) .
They include and also guarantee protection against fault currents:

• Sinusoidal AC residual currents (AC type)
• Pulsed DC residual currents (A type)

They can be adapted, without exception, to all the application cases defined in standards IEC 60364 and EN 50178.
The B type RCCB combination with variable speed drives of the Telemecanique
brand has been successfully tested and validated.