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

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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
- Four PortServer TS II units networked over Ethernet for remote serial device management
- Compatible with industrial controls, meters, sensors, and legacy serial equipment
- Compact design (8.7 x 5.8 x 1.0 in) scales across distributed installations
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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
- 8 units per pack reduce procurement cycles for multi-location deployments
- DB-9M connectors work with standard serial port interfaces and legacy systems
- Compact 10.5 x 8.0 x 2.0 in bundle for easy installation in infrastructure setups
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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
- 4-foot length supports panel-mount and rack-adjacent equipment setups
- RJ-45 male connector enables serial-over-ethernet communication
- Industrial-grade operating temperature range for demanding environments
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$21.99

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Digi International

SKU: 76000724

Digi International 76000724 48-Inch DB-9 Bare Wire Cable

48-inch DB-9 bare wire cable for serial port custom wiring
- 48-inch length with bare wire ends for direct termination into patch panels
- Pack of 10 cables for equipment rooms and network management installations
- Compatible with Digi serial devices, console servers, and standard DB-9 ports
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$21.99

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Digi International

SKU: 76000732

Digi International 76000732 48 Power Cord Locking Barrel

4' power cord with locking barrel connector for Digi 48 series
- Locking barrel design prevents accidental disconnection during operation
- 4-foot cord length fits standard rack and wall-mounted installations
- Compatible with Digi Connect WAN, ConnectPort X4, PortServer TS models
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$14.99

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Digi International

SKU: 76000734

Digi International 76000734 12VDC/120-240VAC Power Supply

Dual-input 12VDC supply converts 120–240VAC for global deployments
- Accepts 120VAC or 240VAC input for worldwide facility compatibility
- Compact 92 × 31 × 50mm form factor weighs only 166g
- UL, cUL, CE, and TÜV certified for security and telecom infrastructure
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Digi International

SKU: 76000735

Digi International 76000735 12VDC 0.5A Power Adapter

Dual-voltage 12VDC 0.5A wall adapter for global Digi device deployments
- 120-240VAC universal input eliminates regional power supply sourcing
- 12VDC 0.5A output rated for serial servers and console device integration
- Compact wall-mount form factor with FCC/UL certifications for OEM use
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$37.99

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Digi International

SKU: 76000736

Digi International 76000736 12VDC/120-240VAC Extended

12VDC power supply, 120-240VAC input, -35°C to 74°C operation
- Extended temperature range (-35°C to 74°C) for outdoor and uncontrolled environments
- Universal AC input (120-240VAC) supports global and varied facility power standards
- Compatible with Digi networking and edge computing platforms; UL/CE certified
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Digi International

SKU: 76000738

Digi International 76000738 12VDC/90-264VAC Wall Mount Power

Wall-mount 12VDC supply, universal 90–264VAC input for global use
- Delivers 12VDC output for Digi networking and gateway devices worldwide
- Accepts 90–264VAC input; works across North American and international circuits
- Compact wall-mount form factor fits equipment racks and network enclosures
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$52.99

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Digi International

SKU: 76000752

Digi International 76000752 12VDC/100-240VAC Extended

12VDC industrial power supply, 100-240VAC input, -35°C to 74°C
- Universal 100-240VAC input handles global standards and unstable grids
- Extended temperature range -35°C to 74°C for outdoor and non-climate controlled
- Dual-input design for industrial networking, telecom, and security systems
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Digi International

SKU: 76000756

Digi International 76000756 DIN Rail Bracket Kit

Stainless steel DIN rail bracket kit for Digi device cabinet mounting
- Mounts Digi-compatible devices directly to standard DIN rail infrastructure
- Stainless steel construction resists corrosion in industrial control cabinets
- Modular standardized design simplifies installation in telecom and security setups
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$20.99

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Digi International

SKU: 76000769

Digi International 76000769 AC Power Cord US to IEC

US to IEC C13 AC power cord for Digi networking equipment
- IEC C13 connector compatible with Digi International devices
- Standard AC power cord for networking and telecom installations
- Replacement cord for infrastructure deployments requiring US outlet
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Digi International

SKU: 76000842

Digi International 76000842 GPS Antenna with Magnet Mount

Magnetic-mount GPS antenna for Digi cellular gateways
- 1575 MHz GPS receiver with 28 dB gain for positioning and timing
- Magnet mount attaches to metal surfaces without permanent installation
- Compact 9.0 x 7.0 in footprint weighs 0.24 lbs for mobile deployment
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$34.99

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Digi International

SKU: 76000912

Digi International 76000912 ConnectTank Replacement Battery

OEM replacement battery for Digi ConnectTank backup power
- Genuine Digi component maintains uninterrupted operation in remote deployments
- Fits standard ConnectTank systems without modification or compatibility issues
- Compact 4.5 x 6.5 x 2.5 in design weighs 0.68 lbs for easy handling
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$74.99

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Digi International

SKU: 76000926

Digi International 76000926 Indoor SMA Male 3dBi Antenna

Indoor SMA antenna with 3dBi gain for compact wireless deployments
- 3dBi gain supports 3G/4G/LTE across 699–2690 MHz frequency range
- Compact 196mm height fits space-constrained indoor installations
- SMA male connector integrates directly with Digi wireless systems
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$10.99

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Digi International

SKU: 76000954

Digi International 76000954 Antenna Base Connector

SMA female antenna base connector for Digi wireless devices
- Mechanical and electrical interface for Digi networking hardware
- Black antenna base assembly with integrated connector interface
- Compatible with security, telecom, and industrial networking systems
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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 76000701 DIGI ONE PortServer TS II 4-Pack

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

Digi International 76000723 4FT Serial Cable RJ-45 Male

Digi International 76000724 48-Inch DB-9 Bare Wire Cable

Digi International 76000732 48 Power Cord Locking Barrel

Digi International 76000734 12VDC/120-240VAC Power Supply

Digi International 76000735 12VDC 0.5A Power Adapter

Digi International 76000736 12VDC/120-240VAC Extended

Digi International 76000738 12VDC/90-264VAC Wall Mount Power

Digi International 76000752 12VDC/100-240VAC Extended

Digi International 76000756 DIN Rail Bracket Kit

Digi International 76000769 AC Power Cord US to IEC

Digi International 76000842 GPS Antenna with Magnet Mount

Digi International 76000912 ConnectTank Replacement Battery

Digi International 76000926 Indoor SMA Male 3dBi Antenna

Digi International 76000954 Antenna Base Connector

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