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BETA Protecting
Residual Current Protective Devices
5
SU1 RCBOs, type A
2/22
Siemens ET B1 · 10/2008
2
*
You can order this quantity or a multiple thereof.
■
Overview
RCBOs are a combination of an RCCB and a miniature circuit
breaker in a compact design for personnel, fire and line protection.
For personnel and fire protection, the residual current part of the
type A trips in the event of sinusoidal AC residual currents and
pulsating DC residual currents.
RCBOs with a rated residual current of maximum 30 mA are
used for personnel, material and fire protection, as well as for
protection against direct contact. RCBOs with a rated residual
current of 10 mA are primarily used in areas that represent an
increased risk for personnel and the outdoor installations of
residential buildings.
Devices with a rated residual current of maximum 300 mA are
used as preventative fire protection in case of insulation faults.
The MCB part of the RCBO protects lines against overload and
short circuits and is available in characteristics B and C.
Since DIN VDE 0100-410 came into effect in June 2007, all
socket outlet current circuits up to 20 A must now also be fitted
with residual current protective devices with a rated residual
current of max. 30 mA. This also applies to outdoor electrical
circuits up to 32 A for the connection of portable equipment.
In order to implement this protection, we recommend the national
use of RCBOs with 30 mA.
Assignment to each individual branch circuit helps prevent the un-
wanted tripping of fault-free circuits induced by the accumulation
of operation-related leakage currents or by transient current
pulses during switching operations.
Additional components of the 5SY miniature circuit breakers can
be mounted at the side and carry out additional functions.
For further details on additional components, please refer to the
chapter "Miniature circuit breakers".
RCBOs comprise one part for fault-current detection and one
part for overcurrent detection. They are equipped with a delayed
overload/time-dependent thermal release (thermal bimetal) for
low overcurrents and with an instantaneous electromagnetic
release for higher overload and short-circuit currents.
The special contact materials used guarantee a long service life
and offer a high degree of protection against contact welding.
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Benefits
For all versions
•
Clear and visible conductor connection in front of the busbars
that can be easily checked
•
Large and easily accessible wiring space enables easy
insertion of conductor in the terminals.
•
The surge current withstand capability of more than 1 kA
ensures safe and reliable operation
•
All additional components for miniature circuit breakers can
be retrofitted on the right-hand side.
For all 10 kA versions up to 40 A
•
Integrated movable terminal covers located at the cable entries
ensure the terminals are fully insulated when the screws are
tightened. The effective touch protection when grasping the
device considerably exceeds the requirements of BGV A3.
•
The RCBOs can be quickly and easily removed from the
assembly by hand if connections need to be changed. This
saves time if parts need to be replaced because the busbars
no longer need to be freed from the adjacent miniature circuit
breakers.
For all 125 A versions
•
The RCBOs offer external remote tripping over terminals
Y1/Y2. This supports implementation of central OFF circuits.
-25
(
Type A)
© Siemens AG 2008