Typically a master RCD is fitted rated at 100mA. This won't save your life but is an overall protection of gross faults. After that any amount of 30mA RCD's are put on separate circuits. I don't know if you can say get a 60mA RCD. Or maybe you need to fix the equipment. The 30mA will cut out at less but with a longer fault. It's about how much for how long that the human body can withstand.

Sent from my phone so mind the autocorrect.