Power Supplies for Surveillance & Access Control Systems

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

Showing Results for Power Supplies

Compare

Add to Cart The item has been added
Digi International

SKU: 76000238

Digi International 76000238 48-Port RJ-45/DB-25M Crossover Cable

48-port RJ-45 to DB-25M crossover cable for serial device servers
- 48 ports cross-wired for direct RJ-45 to DB-25M serial connectivity
- Designed for Digi terminal servers and industrial networking equipment
- Compact assembly (1.0 x 6.5 x 10.0 in) fits rack and cabinet installs
In stock · Ships same business day

$32.99

Add to Cart
The item has been added
Compare

Add to Cart The item has been added
Digi International

SKU: 76000240

Digi International 76000240 48-Inch RJ-45/DB-9M Serial Cable

48-inch RJ-45 to DB-9M serial cable for legacy device integration
- 48-inch length spans equipment racks and network closets without splicing
- RJ-45 to DB-9 male connectors link modern serial ports to legacy gear
- 0.2 lbs lightweight design installs easily in server and telecom setups
In stock · Ships same business day

$32.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000264

Digi International 76000264 48IN RJ-45/DB-9M Crossover Cable

RJ-45 to DB-9M crossover cable for serial console integration, 48 inches
- Connects RJ-45 terminal servers to DB-9M serial devices with crossover wiring
- 48-inch length spans equipment racks and legacy serial infrastructure setups
- Digi-compatible for data center console access and network device configuration
Special Order · Ships in 2-3 weeks

$32.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000528

Digi International 76000528 AccelePort XP/NEO 4-Port Serial

4-port serial expansion module for AccelePort XP/NEO systems
- Four RS-232/422/485 ports in compact expansion form factor
- Direct compatibility with AccelePort XP and NEO host systems
- Telecom, industrial automation, and security applications
Special Order · Ships in 2-3 weeks

$59.99 $56.99 Save $3.00

Add to Cart
The item has been added
Compare

Add to Cart The item has been added
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
- 6-foot length connects servers and network equipment for out-of-band management
- RJ-45 connector compatible with Sun Netra and Cisco serial/console ports
- Weighs 0.17 lbs for portable deployment in data center environments
In stock · Ships same business day

$25.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000641

Digi International 76000641 Wall Mount Bracket

Wall mount bracket for Digi networking and comms devices
- Standardized mounting patterns fit Digi infrastructure equipment
- Lightweight 0.05 lb design with compact 3.5 x 6.5 x 1.0 in footprint
- Fixed wall mounting for network closets, equipment rooms, and security systems
Special Order · Ships in 2-3 weeks

$38.99

Add to Cart
The item has been added
Compare

Add to Cart The item has been added
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
- Crossover configuration routes serial signals between RJ-45 and DB-9F connectors
- 48-inch length bridges console-to-device connections in network installations
- Designed for legacy equipment, terminal servers, and managed switch console ports
In stock · Ships same business day

$32.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000654

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

12VDC regulated supply, 100–240VAC universal input for global use
- Compact wall-mount or rack form factor for network infrastructure setups
- 12VDC output with Digi standard connector for compatible devices
- Universal 100–240VAC input works across varying utility standards worldwide
Special Order · Ships in 2-3 weeks

$58.99 $55.99 Save $3.00

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000662

Digi International 76000662 One SP Wall Mount Bracket Kit

Wall mount bracket kit for Digi One SP serial device servers
- Fits 19-inch rack and non-rack wall installations in network closets
- Metal bracket construction with full port access for serial and Ethernet
- Compact 4.1 x 6.5 x 2.5 in footprint optimizes space in server rooms
Special Order · Ships in 2-3 weeks

$34.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000671

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

DB-9F serial connectors 8-pack for Digi CM/PASSPORT devices
- Eight DB-9F female connectors for multi-device serial installations
- RS-232 serial interface compatible with Digi CM and PASSPORT series
- Supports legacy industrial connectivity and access control deployments
Special Order · Ships in 2-3 weeks

$64.99 $61.99 Save $3.00

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000682

Digi International 76000682 DIN-Rail Bracket Kit

DIN-rail bracket kit for Digi devices in control cabinets
- Tool-free mounting on standard DIN-rail infrastructure
- Aluminum construction, fits Digi devices with DIN-rail support
- Compact 8.4 x 10.4 in footprint for space-constrained racks
Special Order · Ships in 2-3 weeks

$24.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000696

Digi International 76000696 TS 8/48VDC Power Supply

48VDC regulated supply for TS series terminal servers and security infrastructure
- 48VDC output powers Digi TS terminal servers in remote access and distributed deployments
- DIN-rail and rack mounting for integration into equipment enclosures and field installations
- UL/cUL certified regulated DC supply rated 0° to 40°C operating temperature range
Special Order · Ships in 2-3 weeks

$95.99 $91.99 Save $4.00

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000697

Digi International 76000697 Serial Adapter DTE DB-9

DB-9 DTE serial adapter for legacy devices on Digi servers
- DB-9 connector with RS-232 standard for existing serial infrastructure
- DTE mode operation compatible with Digi International device servers
- Connects industrial control systems and access control equipment
Special Order · Ships in 2-3 weeks

$45.99

Add to Cart
The item has been added
Compare

Out of stock
Digi International

SKU: 76000698

Digi International 76000698 PortServer TS II 4-Pack

4-pack serial device servers for remote access over TCP/IP networks
- Four PortServer TS II units for distributed multi-site serial device management
- TCP/IP network connectivity enables centralized access to legacy serial equipment
- Compact form factor (9.0 x 7.0 x 2.0 in) fits tight infrastructure deployments
Special Order · Ships in 2-3 weeks

$32.99 $31.99 Save $1.00

Add to Cart
The item has been added
Compare

Out of stock
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
- 1 serial port per unit with Ethernet RJ-45 connectivity for distributed deployments
- 4-unit bundle reduces per-unit cost for multi-location industrial automation setups
- Compact 1.0 x 7.0 x 9.0 in form factor fits standard rack and shelf installations
Special Order · Ships in 2-3 weeks

$32.99 $31.99 Save $1.00

Add to Cart
The item has been added
Compare

Add to Cart The item has been added
Digi International

SKU: 76000700

Digi International 76000700 PortServer TS II 4-Pack

Serial-to-Ethernet bridge 4-pack for legacy device integration
- Four PortServer TS II units for distributed serial infrastructure upgrades
- Transparent serial-to-Ethernet connectivity across Windows, Linux, Unix networks
- Supports telecommunications, industrial automation, security, and access control systems
In stock · Ships same business day

$32.99 $31.99 Save $1.00

Add to Cart
The item has been added

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.

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.

Power Supplies

Plan Your Deployment

Showing Results for Power Supplies

Digi International 76000238 48-Port RJ-45/DB-25M Crossover Cable

Digi International 76000240 48-Inch RJ-45/DB-9M Serial Cable

Digi International 76000264 48IN RJ-45/DB-9M Crossover Cable

Digi International 76000528 AccelePort XP/NEO 4-Port Serial

Digi International 76000631 6-Foot RJ-45 Serial Cable

Digi International 76000641 Wall Mount Bracket

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

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

Digi International 76000662 One SP Wall Mount Bracket Kit

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

Digi International 76000682 DIN-Rail Bracket Kit

Digi International 76000696 TS 8/48VDC Power Supply

Digi International 76000697 Serial Adapter DTE DB-9

Digi International 76000698 PortServer TS II 4-Pack

Digi International 76000699 ONE PortServer TS II 4-Pack

Digi International 76000700 PortServer TS II 4-Pack

Browse by Product Family

What to Look For When Buying

Technology Stack

Typical Deployment Scenarios

Top Brands for Power Supplies

Frequently Asked Questions

Related Categories

Engineering Reading