Are circuit breakers enough to protect us against electric shock?

[grenade0]

ELCB is useful when there is a current leakage via earth wire, e.g. Somehow current flows to surface of Geyser or Cooler and so when you touch it, the main board will be trip. However it wouldn't protect against scenarios when you accidentally touch a live wire because then the current doesn't flow via earth wire but directly through you. So in short, ELCB is great but RCCB is slightly better.

So should we install both ELCB AND RCCB or will RCCB serve the purpose of both?

 

[k660]

Might come in handy.
( Just some info ).

 

[ze_cook]

So should we install both ELCB AND RCCB or will RCCB serve the purpose of both?

RCCB is enough, it does what ELCB does, but is not dependant on the ground connection being intact. Even if there is a leakage to ground wire (and ground is not shorted to neutral in your house), there will be a current imbalance between phase and neutral, causing the RCCB to trip.

 

[msvsme]

Also search for rcbo. Rcbo is rccb with current overload and leakage protection. You can replace the isolator with rcbo if putting new box is an issue.
Rccb and rcbo has button to test if the protection is working. Old houses with improper wiring trips too much I heard. Not sure if replacing isolator with rcbo is allowed.