Planet Technology Planet 4-Port 10/100Mbps +1/2 100FX Fiber Port Industrial Fast Ethernet Switch ISW-621 - Manual (Page 17)

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2.1.4 Wiring the Power Inputs
The 6-contact terminal block connector on the top panel of Industrial
Fast Ethernet Switch is used for two DC redundant powers input. Please
follow the steps below to insert the power wire.
1. Insert positive / negative DC power wires into the contacts 1 and 2
for POWER 1, or 5 and 6 for POWER 2.
V1- V1 + V2 - V2 +
2. Tighten the wire-clamp screws for preventing the wires from
loosing.3.
1 2 3 4 5 6
Power 1 Fault Power 2
- + - +
Note
The wire gauge for the terminal block should be in the
range between 12 ~ 24 AWG.