The answer to 'why is my recessed lighting tripping breaker' is that there are several common causes, including overloading the circuit, a short circuit, or a problem with the recessed light fixtures themselves. Tripping the breaker is a safety mechanism to prevent electrical fires or damage to your home's wiring.
Some of the most common reasons recessed lighting trips the breaker include using too many lights on a single circuit, a problem with the wiring or connections in the recessed lights, or a short circuit in one of the light fixtures. In some cases, the breaker may be too small for the electrical load of the recessed lighting circuit.