User's Manual

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Figure D.12 – Rack Card Pin Out
Appendix E – Click! 221 User Reference Guide
The Click! 221 is a DC 8-Amp surge protection device (8 amps is the maximum
rating of a T-bus connector). The DC source voltage and PE (protective earth) should
be wired into the screw terminals on the bottom side of the device. A protective
earth wire of 12 AWG is recommended. The device works with up to 8 amps of
continuous current at a maximum of 28 VDC.
DC-voltage outgoing onto the T-bus is protected from electrical surges incoming
from the DC+ and DC- screw terminals. These terminals do not have reverse-
polarity protection, but assumes that all downstream devices will have proper
polarity protection. The surge protection meets the IEC 61000-4-S 4KV (Class 4)
specification.