Curtis PMC 1209B/1221B/1221C/1231C Manual
12
HARDWARE INSTALLATION
to the high voltage source. The relay should be rated to carry a minimum of 30
mA at the nominal battery pack voltage.
Polarity Protection Diode
For polarity protection, a diode should be added to the control circuit. This diode
must be sized appropriately for the maximum total contactor coil currents.
Control Wiring Fuse
To protect the control circuitry from accidental shorts, a small fuse (typically 10
amps) connected in series with the B+ feed to the control circuitry wiring is
recommended.
Power Wiring Fuse
To protect the power wiring circuit, a fuse appropriate for the controller’s rated
current (see Appendix C) is recommended.
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