104 APPENDIX
Note
Contact Wavetronix Technical Services if you have a need for a cabled connection over
500 ft. (152.4 m).
Appendix C – Click 221 User Reference Guide
e Click 221 is a DC 8 A surge protector (8 A is the maximum rating of a T-bus connec-
tor). e DC source voltage and PE (protective earth) should be wired into the screw ter-
minals on the bottom side of the device. A 12 AWG protective earth wire is recommended.
e device works with up to 8 A of continuous current at a maximum of 28 VDC.
Note
This appendix covers the basics of the Click 221. For a full explanation of how to use
the Click 221, see the Click Series User Guide.
Outgoing DC- voltage onto the T-bus is protected from electrical surges incoming from the
DC+ and DC- screw terminals. ese terminals do not have reverse-polarity protection,
but assumes that all downstream devices will have proper polarity protection. e surge
protection meets the IEC 61000-4-S 4KV (Class 4) specication.
Figure C.1 – Click 221
e LED on the faceplate will be on if the device is properly powered and the surge protec-
tion is operational (see Figure C.1). e LED will be o if the DC wires are wired backwards
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