Power Relay ( ÀÏ¹Ý °øÅë »çÇ× )
Over Power Relay ( °úÀü·Â °èÀü±â )
Under Power Relay ( ÀúÀü·Â °èÀü±â )
Reverse Power Relay ( ¿ªÀü·Â °èÀü±â )