Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
449
Installation
Installation
Regardless of the type of connection technology installed on the 3VA1 molded case circuit
breaker, the RCD520B residual current device is mounted on the load side (i.e. beneath the
thermal-magnetic trip unit) of the breaker:
1. Dismantle the loadside connection components of the molded case circuit breaker and
install the supplied connection components for the residual current device.
2. Insert the residual current device into the T slots of the molded case circuit breaker.
3. Push the residual current device backwards until its rear panel is flush with the rear panel
of the molded case circuit breaker.
4. Screw the molded case circuit breaker to the residual current device. Special connecting
screws are provided on the line side of the residual current device for this purpose.
5. Place a contact hazard protective cover over the circuit breaker/RCD assembly.
6. Reinstall the loadside connection components of the molded case circuit breaker at the
outgoing feeder end of the residual current device.
7. Attach the assembly to a mounting plate using the mounting screws.
Since the outgoing feeder end of the residual current device has exactly the same
connection contours as the 3VA11 molded case circuit breaker, all connection accessories,
e.g. phase barrier, terminal cover, can also be mounted on the residual current device.
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