Earth leakage circuit breaker OR residual current circuit breaker protect the human from electrocution and wiring from fires due to leakages. For human protection ELCB (RCCB) with 30 mA sensitivity is recommended. The other range of sensitivity includes 100mA, 300mA. RCCBs are typically 2 pole or 4 pole with continuous current rating of 25Amp, 32 Amp, 40Amp, 63 Amp etc.
Hager, Legrand, ABB, Siemens, Schneider are the typical brands of MCBs. The same range is available with Indian manufacturers like L&T, Havells, Indo-Asian.
RCBOs / ELMCBs are combination of ELCB and MCB. It protects installation against overcurrent and earth leakages.