**Leave the breaker off and stop resetting it.** The tripping indicates a fault; your connections may have created a short circuit. Before touching any wires, verify that power is off with a suitable tester. [ESFI safety guidance](https://www.esfi.org/test-before-you-touch)

**Wire colors alone cannot establish the correct connections here.** In an older switch loop, a white wire can carry hot power. Joining all the whites and all the blacks can therefore connect hot directly to neutral when the switches operate.

The new fixture needs these connections, once the ceiling wires have been positively identified:

| Fixture wire | Connects to |
|---|---|
| Black | Switched hot returning from the switches |
| White | Supply neutral |
| Ground | Verified equipment grounding connection |

The existing two switches can still control a fixture with one black and one white lead. The switching happens upstream of the fixture. [Leviton wiring diagrams](https://leviton.com/content/dam/leviton/commercial-industrial/product_documents/brochure/Commercial%20Industrial%20Switch%20Brochure%20Q-1223A%20AUG23v1.pdf)

One possible arrangement uses one ceiling cable for the supply and another to feed the switches and return switched power. That arrangement requires a separate splice between the supply hot and the switch feed. **Your description does not identify which wires perform those functions**, and the “little metal tab” needs identification too.

Because the original connections have been disturbed and the breaker has repeatedly tripped, have an electrician trace the cables, identify the conductors, and check for damage before reconnecting the fixture. A green screw provides grounding only when it connects to a verified grounding path.