Two models, Altronix ACM4E with fuse-protected outputs and the ACM4CBE with PTC-protected outputs, are housed in enclosures and may be utilized to expand the number of outputs for any UL listed power supply. The ACM4E and the ACM4CBE have received UL listing in the United States and Canada. These units are also available as ACM4 and ACM4CB which are sub-assemblies without enclosures that carry the UL mark in the United States.

The units' outputs can be activated by an open collector sink or normally open (NO) dry trigger input from an access control system, card reader, keypad, push button, PIR, etc. Fire alarm disconnect options include normally open (NO) or normally closed (NC) dry contact input and polarity reversal input from an FACP (Fire Alarm Control Panel) signaling circuit. An alarm output relay indicates that FACP input is triggered. LEDs indicate output and fire alarm disconnect status.

The units are designed to be powered by one common power source that can provide power for both the unit's operation and locking devices; or by two totally independent power sources, one to operate the unit and the other for lock/accessory power.