Progressive Industries HW30C Hardwired EMS Surge &amp; Electrical Protection- 30 Amps<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Over/Under voltage protection</li><li>Open ground， open neutral and reverse polarity detection and prevention</li><li>Accidental 240 protection</li><li>A/C frequency protection</li><li>Adjustable time delay</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41E%2Brkg-0GL.jpg" noproxy>