Altronix AL400ULACMCB Access Power Supply Cabinet (4A, 8-Output)

Boxed 12VDC 4A access control power system with 8-output power distribution, low-battery cutoff, and ULB-listed access compliance — the workhorse cabinet for 4-8 door installs.

Deployment context

Single-cabinet head-end for 4-8 door access control installations. Mounted in IT/electrical room near the access controller. Boxed configuration eliminates separate distribution board purchase.

Load characteristics & current behavior

4A continuous at 12VDC. Each of 8 outputs PTC-protected and individually fused. Handles inrush from 4 simultaneous strike fires; 8-door inrush will sag bus voltage briefly (10-20ms) but recovers without dropping locks.

Failure & backup behavior

Low-battery cutoff at ~10.5V prevents deep SLA discharge. AC-fail relay output for monitoring integration. Output fault isolation — single door short doesn’t cascade to others. No supervised output reporting per door (consider LifeSafety FPO for that).

UL / safety standards

UL294 listed (access control), UL603 listed (police/fire), CSA C22.2, FCC Class B. ULB suffix indicates Listed Battery-backed configuration.

Runtime considerations

With 12Ah SLA battery: ~3 hours at 4A continuous load (3 doors with maglocks). With 18Ah: ~4.5 hours. Sized for code-minimum 4-hour fail-safe operation on a 4-door site.

Commonly paired hardware

Kantech KT-1/KT-2/KT-400 controllers · Securitron M62 maglocks · HES 1006 electric strikes · 12Ah or 18Ah SLA battery (sold separately) · Altronix Maximal3D or Maximal11 for output expansion

Reference: Power Supply Sizing Guide · Access Control Buying Guide