small bus-bar

例句：

1. 1. The small bus-bar is usedto control the current flow in the circuit.
   小型断路器用于控制电路中的电流流动。
2. 2.The small bus-bar was installed inthe electrical panel to prevent overheating.
   小型断路器安装在配电板上以防止过热。
3. 3. Thesmall bus-bar was replaced after itfailed during a power outage.
   小型断路器在一次停电后失效，被更换了。