Overcurrent protection device and three-phase inverter

The invention discloses an overcurrent protection device and a three-phase inverter. The overcurrent protection device comprises a control module, a first current detection module arranged on a positive bus, a second current detection module arranged on a negative bus and a controllable switch module arranged on a neutral line loop, the first current detection module is used for detecting current on the positive bus and converting the current on the positive bus into first voltage to be output; the second current detection module is used for detecting current on the negative bus and converting the current on the negative bus into second voltage to be output; the control module is used for controlling the controllable switch module to be switched off when at least one of the first voltage or the second voltage exceeds a threshold voltage. Current on a positive bus and current on a negative bus are detected through the first current detection module and the second current detection module, and the controllable