Accessories
4.8 Residual current devices
3VA molded case circuit breakers
300 Manual, 04/2015, A5E03603177010-02
Residual current devices for mounting on circuit breakers
The RCD310, RCD510, RCD320, RCD520 and RCD820 residual current devices are
available as accessories for mounting on specific 3VA molded case circuit breakers up to the
largest circuit breaker size/current rating.
Combination with circuit breakers
After a residual current device has been mounted on a molded case circuit breaker or switch
disconnector, the specifications of the breaker or disconnector remain unchanged with
respect to the following characteristics:
● Standards
● Conductor cross-sections
● Use of connection accessories
● Isolating features
● Selective behavior
When a basic type residual current device is mounted on a 3VA1 molded case circuit
breaker or a 3VA1 switch disconnector, the electrical rating of the equipment combination is
automatically downgraded to the lower electrical rating of the residual current device.
Example:
U
e
: 3VA1 ≤ 690 V AC
3VA1 and Basic residual current device ≤ 480 V AC
For more information, refer to chapter Technical specifications (Page 352).
Residual current devices
Standards
The combination of molded case circuit breaker and residual current device conforms to
IEC 60947-2 Annex B.
The residual current devices do not require an external power supply, but tap a supply from
the main current paths of the molded case circuit breaker or switch disconnector.
Guaranteed to function properly
Proper functioning of the residual current device is guaranteed even with only one phase and
N (applies to RCD320, RCD520 and RCD820) or two phases (alternating current or
pulsating direct voltage).
Direction of incoming supply
The direction of incoming supply to the combination of circuit breaker and residual current
device is optional, i.e. it can be connected at the top or bottom. The performance of the
residual current devices is not impaired by regenerative feedback from motors.
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