I'm looking for a circuit breaker that interrupts the circuit when current drops to zero
simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. A thyristor latching circuit.

Thyristors have the characteristic that once triggered by injecting enough current into the gate will latch on until the current through them falls below the hold-on value - typically a few tens of mA.

Pretty much any regular thyristor should do the job and you should be able to find the rated current and the hold-on current in the datasheet fairly easily.