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Power Supplies

Power supplies provide stable and regulated power for surveillance cameras, access control devices, and intercom systems. Selecting the proper voltage, amperage, and redundancy configuration ensures reliable operation and minimizes system downtime in commercial environments.

Plan Your Deployment

Voltage and amperage requirements for connected devices
Centralized vs distributed power architecture
Redundancy and failover considerations
Indoor vs outdoor installation requirements
Code compliance and surge protection planning

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Digi International

SKU: 76000528

Digi International 76000528 AccelePort XP/NEO 4-Port Serial

4-port serial expansion module for AccelePort XP/NEO systems
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Digi International

SKU: 76000631

Digi International 76000631 6-Foot RJ-45 Serial Cable

6-foot RJ-45 serial cable for Sun Netra and Cisco console access
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Digi International

SKU: 76000641

Digi International 76000641 Wall Mount Bracket

Wall mount bracket for Digi networking and comms devices
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Digi International

SKU: 76000645

Digi International 76000645 48-Inch RJ-45/DB-9F Crossover Cable

48-inch RJ-45/DB-9F crossover cable for serial device console access
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Digi International

SKU: 76000654

Digi International 76000654 12VDC/100-240VAC Power Supply

12VDC regulated supply, 100–240VAC universal input for global use
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Digi International

SKU: 76000662

Digi International 76000662 One SP Wall Mount Bracket Kit

Wall mount bracket kit for Digi One SP serial device servers
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Digi International

SKU: 76000671

Digi International 76000671 Cm/passport 8-Pack DB-9F

DB-9F serial connectors 8-pack for Digi CM/PASSPORT devices
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Digi International

SKU: 76000682

Digi International 76000682 DIN-Rail Bracket Kit

DIN-rail bracket kit for Digi devices in control cabinets
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Digi International

SKU: 76000696

Digi International 76000696 TS 8/48VDC Power Supply

48VDC regulated supply for TS series terminal servers and security infrastructure
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Digi International

SKU: 76000697

Digi International 76000697 Serial Adapter DTE DB-9

DB-9 DTE serial adapter for legacy devices on Digi servers
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Digi International

SKU: 76000698

Digi International 76000698 PortServer TS II 4-Pack

4-pack serial device servers for remote access over TCP/IP networks
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Digi International

SKU: 76000699

Digi International 76000699 ONE PortServer TS II 4-Pack

4-pack serial device servers for remote legacy device access over Ethernet
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Digi International

SKU: 76000700

Digi International 76000700 PortServer TS II 4-Pack

Serial-to-Ethernet bridge 4-pack for legacy device integration
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Digi International

SKU: 76000701

Digi International 76000701 DIGI ONE PortServer TS II 4-Pack

Four serial device servers for Ethernet-based legacy equipment access
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Digi International

SKU: 76000702

Digi International 76000702 CM/Passport 8-Pack DB-9M Modem

8-pack DB-9M modems for serial communication across distributed sites
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Digi International

SKU: 76000723

Digi International 76000723 4FT Serial Cable RJ-45 Male

4ft RJ-45 serial cable rated for 10/100 Mbps industrial networks
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Browse by Product Family

Click through to shop the families that fit your power supplies deployment.

Regulated DC Power Supplies

Fixed-output 12V, 24V, and 48V supplies for cameras, locks, and readers. Available in wall-mount, DIN-rail, and enclosed formats with current ratings from 2A to 40A.

Redundant & Backup Power

Dual-supply and UPS-integrated units that eliminate single points of failure. Critical for 24/7 access control and life-safety intercom systems.

PoE Injectors & Midspan Units

Power-over-Ethernet solutions for camera deployments where switch-based PoE is unavailable or insufficient. Supports standard PoE, PoE+, and high-power variants.

Industrial & Enclosed Supplies

Weatherproof, DIN-rail, and panel-mount supplies rated for outdoor cabinets and harsh electrical environments. Typically 24V and 48V output.

Multi-Output & Modular Power

Single units delivering multiple voltages (12V + 24V, for example) or stackable modular supplies for large distributed deployments.

Compact & DIN-Rail Supplies

Space-efficient 35mm DIN-rail mounted units for server rooms, network closets, and electrical cabinets. Easy to stack and wire.

What to Look For When Buying

The decisions that matter most before you spec.

Amperage & Load Planning

Size your supply at 120–130% of peak load to avoid thermal shutdown and extend component life. A 24V system with five 5A devices (25A nominal) needs a 32A or 40A supply. Under-sizing is a leading cause of system failure during peak demand.

Redundancy for Life-Safety & Access Control

Single supplies fail without warning. Dual-supply designs or UPS-backed configurations ensure doors unlock and intercoms function during power anomalies. Redundancy is required by code in many jurisdictions for egress and emergency communication.

Voltage Selection & Device Compatibility

Most locks, readers, and access points run 12V or 24V; cameras vary widely. Verify every device's rated voltage before specifying. Mixing 12V and 24V systems in one cabinet requires isolated supplies or regulators to prevent cross-voltage damage.

PoE Power Budget Constraints

Standard PoE (802.3af) supplies 15.4W per port; PoE+ (802.3at) 30W; High Power (802.3bt) up to 95W. A 24-port switch can deliver only ~375W total, easily exhausted by dense camera and access-point deployments. Injectors and midspans extend capacity.

Environmental & Mounting Constraints

Outdoor cabinets and damp enclosures require sealed, conformal-coated supplies rated for temperature extremes (−20 to +70°C typical). DIN-rail mounting saves space; enclosed supplies offer better noise isolation and thermal dissipation in server rooms.

Vendor Selection & Lead Times

Brands like Honeywell, Speco Technologies, and HES dominate access-control power; Pelco and Digi International focus on surveillance and networking. Verify manufacturer support, warranty, and stock availability before design lock-in.

Technology Stack

The specs and acronyms that actually affect power supplies performance.

DC Voltage Regulation & Ripple

Quality supplies hold output within ±5% of rated voltage under load variations and input sags. Ripple (AC noise superimposed on DC output) should be <2% peak-to-peak; excessive ripple causes camera image noise and lock chatter. Look for ±5V, ±12V, ±24V stability specs in datasheets.

Current Rating & Amperage Classes

Expressed in Amps (A) at rated voltage—e.g., 24V/5A, 24V/10A, 24V/40A. Higher amperage doesn't mean faster devices; it determines how many devices can draw simultaneously. Always check individual device current draw in milliamps (mA) and sum peak totals, not averages.

Power Factor & Input Voltage Range

Industrial supplies accept 100–240V AC input (worldwide compatible) and deliver regulated DC output. Power factor >0.9 reduces heating and helps avoid utility surcharges. Check input range to ensure compatibility with generators and unclean site power.

Short-Circuit & Fuse Protection

Integral fusing (fast or slow blow) and electronic current limiting protect the supply and downstream wiring from overcurrent events. Some supplies auto-recover; others latch off and require manual reset. Verify protection mode and response time for your application.

UPS Integration & Holdup Time

Supplies with integral or stackable battery backup maintain output for 5–60 minutes during AC loss, bridging the time for graceful shutdown or backup power activation. Holdup time (hold-up capacitor reserves) is separate; typical range 10–50 ms.

PoE (Power over Ethernet) Standards

802.3af (Type 1) = 15.4W, 802.3at (Type 2/PoE+) = 30W, 802.3bt (Type 3/4, High Power) = 60–95W. Injectors and midspan splitters add PoE to non-PoE switches. Always verify endpoint compliance and total switch/injector budget vs. connected device demand.

Typical Deployment Scenarios

Small Office Access Control (Single Door)

One 12V/5A regulated supply feeds an electric strike lock, RFID reader, and request-to-exit button. Total load ~2A. A simple wall-mount supply with integral fuse handles this; add a surface-mount enclosure in humid areas. Budget: 1 supply, 1 backup fuse kit.

Mid-Size Surveillance Closet (16 IP Cameras + NVR)

A 24V/20A regulated DIN-rail supply powers four 5A PoE injectors (one per four cameras), plus the NVR's 24V auxiliary input. If cameras are all PoE-enabled and the switch is remote, injectors bridge the gap. Add a second supply for redundancy and a UPS battery module for 10-minute hold-up.

Multi-Building Campus with Distributed Access (8 Doors, 24 Cameras)

Each building requires a local 24V/10A supply (for locks, readers, intercoms) plus one or two PoE injectors per camera cluster. Cabinet-mounted DIN-rail supplies with integral breakers minimize field wiring. Specify weatherproof outdoor enclosures for exterior cabinets; trunk all power back to a central UPS for life-safety compliance.

High-Density Server & Intercom Integration

A redundant 24V/40A supply pair feeds six 24V devices (intercoms, door controllers, call stations) and distributes 12V to analog sensors via a buck regulator. Modular or multi-output supplies reduce cable clutter. Proper conduit routing and junction boxing maintain code compliance and thermal management.

Top Brands for Power Supplies

Click through to each brand for engineering profile and NDAA compliance status.

Honeywell

Authorized dealer · browse the full Honeywell catalog for this category

Speco Technologies

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HES

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Pelco

Authorized dealer · browse the full Pelco catalog for this category

Digi International

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Comelit

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Frequently Asked Questions

What size power supply do I need for my system?

Add up the current draw (in milliamps or amps) of every device connected to that supply—cameras, locks, readers, intercoms. Multiply by 1.25 (safety factor) and round up to the next standard supply size (e.g., 5A, 10A, 20A, 40A). Always verify supply and load voltage match exactly.

Can I use one power supply for mixed 12V and 24V devices?

No. Single outputs are isolated; mixing voltages risks damage. Use separate regulated supplies for each voltage, or a multi-output supply with isolated rails. If you must share a cabinet, use a buck converter (24V down to 12V) downstream of a 24V primary supply, but size the primary for total current demand.

What's the difference between a regular power supply and a UPS-backed supply?

A regular regulated supply converts AC to clean DC and stops when AC fails. A UPS-backed supply includes integral or stackable battery modules that maintain DC output for minutes after AC loss, allowing orderly shutdown or switchover to backup power. Essential for access control and emergency intercoms.

Do I need a PoE injector if my switch already has PoE?

Not necessarily, but injectors solve two common problems: (1) extending PoE to non-PoE switches, and (2) supplementing insufficient switch PoE budget. A 24-port PoE+ switch can only deliver ~375W total; dense deployments often need additional injectors per camera cluster. Plan your PoE budget carefully upfront.

What does ±5% voltage regulation mean?

The supply guarantees output stays within ±5% of rated voltage (e.g., 24V ±1.2V = 22.8–25.2V) across load and input variations. Tighter specs (±3%) cost more but reduce noise and improve camera image stability. Cameras typically tolerate ±10%; locks are pickier (±5% or better).

How do I mount a power supply in an outdoor cabinet?

Use a DIN-rail mounted supply inside an IP65-rated enclosure. Ensure the enclosure has ventilation or a thermostat fan to keep internal temperature below the supply's rating (typically 70°C max). Add a surge protector or SPD at the AC input, and run conduit from the cabinet to devices using conduit adapters and gang plates for strain relief.

Related Categories

Adjacent equipment that typically ships alongside these products.

Electrical Boxes & Enclosures Conduit Bases, Boxes, & Covers Junction Boxes Conduit Adapters Gang Plates Adapter Boxes & Plates Installation Boxes Converter Plates

Engineering Reading

Deep-dives from our engineering team on deployment planning.

Why Surveillance Systems Fail During Incidents Why Your NVR Can't Handle Its Rated Camera Count Why Surveillance Networks Collapse at the Core Why Large Surveillance Systems Fail: Storage Throughput Reality Why Surveillance Standards Collapse After the Third Location Why 4K Cameras Fail at Night Why Your PoE Switch Fails After 18 Cameras Frame Rate vs. Reality: When 30 FPS Makes Your System Worse