Yes, there is a padlocking device. The part number is A9A27049 and it comes in lots of 10.
For further information please visit https://www.clipsal.com/Trade/Products/ProductDetail?catno=A9A27049
Part number A9A26380 is for mounting on the left side of Circuit Breaker.
Part number A9A26381 is for mounting on the Right side of Circuit breaker.
For further details please follow the below link,
To make 1 Pole 10 Amps B Curve 30mA RCBO, you need the following:
A9F53110 - 1 Pole 10 Amps B Curve Breaker (https://www.schneider-electric.com.au/en/search/A9F53110)
A9V02663 - 2 Pole 30mA 63 Amps Add-on Vigi to suit 1 Pole iC60 Breakers (https://www.schneider-electric.com.au/en/search/A9F53110)
Please note the total width of this combination will be equal to 3 Poles standard RCBO (3 x 18mm)
Yes, Acti9 iC60N/H MCBs are suitable for DC applications ranging from 12VDC to 250VDC subject to the number of poles connected in series and the required breaking capacity.
The attached document shows the number of poles that are required to be connected in series in relation to the supply voltage and the breaking capacity that is achieved.
The magnetic tripping threshold of the Acti 9 and older Multi 9 circuit breakers is higher than in alternating current. The magnetic tripping threshold is determined based on the attached documents.