What power supply do I need if I have more than one access control panel? January 24, 2019 A What power supply do I need if I have more than one access control panel? The MD-990 (24VDC) 5 AMP power supply is used to power the 4 access control modules (TX3-BBCX-4W: 8 door controller). For more information contact your Mircom salesperson.
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