What this jumper set does in the panel
The LV847900 is a set of 10 drawout jumpers for the auxiliary terminal blocks on MasterPact MTZ1, MTZ2, and MTZ3 drawout circuit breakers. These are the small bridging pieces that carry control wiring continuity when the breaker is racked into the connected position — no loose flying leads, no missed terminations during a swap-out. Each set covers ten auxiliary positions, which is enough for a typical MTZ drawout cradle's control wiring interface. The jumper clips onto the terminal block studs inside the cradle; the breaker's auxiliary contacts plug into the jumper on the other side. It's a one-time install that stays with the cradle, not the breaker.