Delta-q IC650 - Page 19

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6.7 Interlock Relay Contacts
The Comm model has three pins marked as “NC, NO, and COM”. These are “dry” contacts of an internal
interlock relay. The term “dry” means there is no power on any of these contacts. The relay itself is driven
when AC Voltage to the charger is in range. For example, when there is AC voltage, the COM and NO pins
will be shorted. Refer to the gure below for the internal schematic of these pins.
It is recommended that the interlock circuit on Delta-Q’s IC650-COMM model is protected by a Fast-Blo fuse
with a current rating of 0.5 A (or less), >100 VDC rating, using any typical “in-line” package and holder.
Examples include:
 0.25” x 1.25” 3AG and 5 mm x 20 mm M205 glass/ceramic cartridge types.
 Auto style blade fuses (e.g. ATC-1) may also be an option, though most are rated at only 32 VDC and may
not be suitable for your application.
While a 1A fuse may be used in some cases, the 0.5A rating is well within the limits of the relay’s contacts, the
PCB traces and the in-line RF/EMI-ltering ferrites.
Delta-Q may use either an Omron (G6S-2F-DC12) or Panasonic (TX2SA-12V) part for the interlock relay.
Worst-case contact specications are listed below the respective gures for your reference
Figure 24. Internal schematic of interlock relay
contacts.
Figure 25. Panasonic TX2SA-12V
1 A @ 30 VDC
30 W (no VA rating available)
Contact resistance: <100 mΩ
Figure 26. Omron G6S-2F-DC12
0.5 A @ 125 VAC
62.5 VA
Contact resistance: <75 mΩ