I'm designing an industrial board that will be powered with a +24V DC. On the PCB there are several fuses to protect each branch against over-current/short-circuit. Example:
simulate this circuit – Schematic created using CircuitLab
Of course the resistors simulates the actual loads: MCU, relays, LEDs, ... The 24V is applied through screw terminals.
I need to protect the circuits ("loads" in this examples) from ESD. As far as I know the ESD protection should be placed very close to the input connector.
So the obviously solution is to add an unidirectional TVS at the input:
Usually I put a fuse before the TVS so it can also be effective on persistent over-voltages or inversion of polarity. But here I don't think it's worth to add another fuse!
Is a single TVS enough for ESD protection? Is there a better (= safer, more reliable) circuit to use in this scenario?
By the way, I don't have a real "ground", so I need to close the discharge to the common voltage (0V).