JY BS-230B 3P 30A 3.7KW ON-OFF PUSH BUTTON (METAL) *Pressing the ON button is a self-locking state. When the OFF button is pressed, the ON button will reset. *Start button can be locked to prevent from unauthorized use. *The switch provide the essential function of safeguarding you and your power-tools for your professional or home workshop. *They fit most of the power tools on the market. Check the listed specifications to assure that this switch meets your application. *Material : Metal *Phase : 3p *Power : 3.7KW *Voltage : 500V