Altronix T1RSH1F4D 24VDC Rack-Mount Power Supply with 4-Door PTC Outputs
Overview
The Altronix T1RSH1F4D is a 24VDC rack-mount power supply engineered specifically for multi-door access control and surveillance power distribution in commercial security installations. Accepting 120VAC/60Hz input and delivering a regulated 24VDC output at 4A continuous, the T1RSH1F4D fits squarely into 19-inch rack enclosures — the standard mounting format in IT rooms, security head-end racks, and equipment closets where organized, serviceable wiring matters. If you're powering multiple door controllers, electric strikes, or magnetic locks from a single consolidated source, this unit is designed for that exact scenario.
The unit draws up to 3.5A from the AC side and is protected by a 5A/250V input fuse. On the DC output side, four independent PTC (Positive Temperature Coefficient) resettable outputs — each rated at 2.5A — distribute power to individual door circuits. That per-circuit protection approach means a single shorted door latch or overloaded strike doesn't take down the rest of the installation. An additional unswitched 1A auxiliary output is available for ancillary loads such as a request-to-exit (REX) device or auxiliary reader.
Key Features
- 24VDC / 4A Continuous Output: Delivers stable 24VDC at up to 4 amps continuously — enough headroom to simultaneously power four door-locking devices without voltage sag that can cause nuisance access control faults or inconsistent lock operation.
- Four Independent 2.5A PTC Outputs: Each door circuit gets its own resettable PTC protection rated at 2.5A. When a circuit overloads, the PTC self-limits current and resets automatically once the fault clears — no fuse replacement, no service call for a tripped breaker.
- 1A Unswitched Auxiliary Output: The auxiliary rail stays live regardless of output switching states, making it practical for powering a 24V reader, a REX sensor, or a door position switch without consuming one of the protected door circuit outputs.
- Relay Rating 28VAC or VDC @ 2.5A: Integrated relay contacts rated at 28V and 2.5A accommodate a range of electrified hardware — electric strikes, mag locks, and motorized locks — without needing an external relay module at each door.
- 120VAC Input with 5A/250V Fuse Protection: Standard North American input voltage (60Hz) means no transformer or step-down required in typical US installations. The input fuse provides upstream AC fault protection for both the unit and the building circuit.
- 19-Inch Rack Format (3.25" x 19.0" x 26.5"): Designed to occupy standard 19-inch equipment racks — the same racks that host your NVR, network switches, and UPS. Centralizing power in the rack simplifies cable management, makes inspections faster, and keeps the installation audit-ready.
- CE European Conformity Listed: CE listing satisfies EMC and safety requirements for European deployments, and is routinely accepted by AHJs (Authorities Having Jurisdiction) in North American commercial projects as a recognized compliance benchmark.
- Operating Range 0°C to 49°C: Rated for the full range of conditioned equipment room environments, including warmer telecom closets that can run 40°C+ under load. The 53 BTU/Hr. thermal output is modest enough that standard rack ventilation handles it without forced cooling.
- Compact Thermal Footprint — 53 BTU/Hr.: At 53 BTU/Hr., this unit adds minimal heat load to your rack. In dense rack environments where thermal management is already tight, a low-heat power supply matters — it reduces the risk of thermal throttling on adjacent network equipment.
Integration & Compatibility
The T1RSH1F4D is part of the Altronix power distribution line, designed to integrate with standard 24VDC access control hardware from Lenel, Software House, Honeywell Pro-Watch, Bosch, and similar enterprise platforms. The four PTC outputs map cleanly to four-door controller deployments — a common topology in floor-by-floor or zone-by-zone access control architectures. For larger multi-door deployments requiring more than four protected outputs or higher total current, Altronix offers higher-capacity variants in the same rack-mount family. Pair this unit with a compatible access control system and a rack-mount UPS for a fully consolidated, battery-backed security power infrastructure. When specifying rack power for surveillance head-ends, review our security power supply category for current availability and compatible models. For installations requiring PoE-powered cameras and door hardware in the same rack, consider pairing the T1RSH1F4D with a dedicated PoE switch to keep low-voltage AC/DC distribution separate from data networking.
Frequently Asked Questions
Q: What input voltage does the T1RSH1F4D require?
A: The T1RSH1F4D accepts 120VAC at 60Hz — standard North American single-phase power. No step-down transformer is required in typical US commercial installations. Input draw is up to 3.5A, protected by a 5A/250V input fuse.
Q: How many doors can this power supply support?
A: The T1RSH1F4D provides four independent PTC-protected outputs, each rated at 2.5A — making it sized for four-door access control deployments. The total continuous DC output is 4A at 24VDC, so budget per-door current draw accordingly when mixing heavy mag locks with lighter electric strikes.
Q: What does the PTC protection do, and do the outputs require manual reset after a fault?
A: PTC (Positive Temperature Coefficient) devices self-limit current when a circuit overloads or shorts, preventing sustained fault current from damaging wiring or connected hardware. Once the fault is cleared and the PTC element cools, the output resets automatically — no fuse replacement or manual intervention required.
Q: What is the relay rating on the T1RSH1F4D?
A: The integrated relay contacts are rated at 28VAC or 28VDC at 2.5A. This accommodates most 24V electrified door hardware including electric strikes and magnetic locks within that current range.
Q: Will this unit fit a standard 19-inch equipment rack?
A: Yes. The T1RSH1F4D measures 3.25 inches high by 19.0 inches wide by 26.5 inches deep — designed for standard 19-inch rack mounting. Verify rack depth clearance (26.5 inches) before installation, particularly in shallow-depth wall-mount enclosures.
Q: What is the operating temperature range?
A: The T1RSH1F4D is rated for 0°C to 49°C (32°F to 120°F) operating temperature and up to 85% relative humidity (±5%). It is not rated for outdoor or uncontrolled-environment installation without an appropriate NEMA-rated enclosure.
The T1RSH1F4D is one of those workhorses you spec into a four-door access control closet and don't think about again. The 4A continuous at 24VDC output covers a typical mix of mag locks (typically 500–600mA each at 24V) and electric strikes (around 250–400mA) across four doors with reasonable margin — just don't load all four outputs to their 2.5A PTC ceiling simultaneously and expect to stay under the 4A aggregate cap.
Technical Highlights:
- Four 2.5A PTC Outputs: Self-resetting protection per door circuit means a wiring fault at door 3 doesn't drop doors 1, 2, and 4 — and there's no service dispatch to replace a blown fuse when the fault clears.
- 1A Unswitched Auxiliary Rail: Useful for a 24V REX sensor or auxiliary card reader that needs continuous power independent of output switching — keeps you from burning a protected door output on a low-draw ancillary device.
- 53 BTU/Hr. Thermal Output: Modest heat load for a 4-door supply. In a fully loaded rack running an NVR, PoE switch, and access controller, this unit won't meaningfully shift your rack thermal budget.
Deployment Considerations:
- Verify rack depth: at 26.5 inches deep, the T1RSH1F4D requires a full-depth 19-inch rack. Wall-mount and shallow-depth telecom enclosures commonly run 18–20 inches of usable depth — confirm before ordering.
- The 4A aggregate output ceiling is the governing constraint, not the per-port 2.5A PTC rating. If your door hardware draws 1.2A average across four doors (4.8A total), this unit is undersized — step up to a higher-output Altronix variant in the same rack family.
This unit is best deployed in IT-room or security-head-end rack builds where four-door coverage, organized 19-inch form factor, and self-resetting per-circuit protection are the design requirements — particularly in mid-size commercial office, retail, or light industrial access control installations running standard 24VDC electrified hardware.
