Details:                      

1.Standard: GB/T18802.21-2004/IEC61643-21:2000 Nation Standard;                                                                                      

2.  Signal: RS485 or 5V signal(transmission rate less than 10Mbps); 3.  Feature: Multi-function and multi-level over-voltage protection,large flow capacity,low voltage limitation,quick response,little insertion loss; 4.  Ground manner: Extension cable touches the ground directly; 5.  Design: Clear and scientific mark,easy to recognize,All-aluminum-made cover,compact design,easy installation.

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