Dortronics 4204NX Power Supply

12/24VDC Selectable | 4A Output | Battery Backup | Access Control Power Supply

Provide dependable regulated power for commercial access-control and electrified door systems with the Dortronics 4204NX Power Supply/Charger.

Designed for professional security and door-control applications, the 4204NX converts 120VAC input to field-selectable 12VDC or 24VDC power with up to 4 amps of continuous output.

Built-in battery charging, fire-alarm disconnect, supervision contacts, and low-voltage protection make the 4204NX an excellent choice for electric locks, magnetic locks, electric strikes, door controls, sensors, and other compatible access-control equipment.

Key Features

• Genuine Dortronics 4204NX

• 120VAC / 60Hz input

• Field-selectable 12VDC or 24VDC output

• Up to 4A continuous output

• Filtered and regulated DC power

• Class 2 power-limited output

• Auxiliary 1A unswitched output

• Built-in battery charger

• Instant battery backup upon AC power failure

• Supervised fire-alarm disconnect

• Latching or non-latching fire-alarm operation

• AC failure supervision contacts

• Battery supervision contacts

• Low-voltage battery shutdown protection

• Overvoltage protection

• LED status indicators

• UL 294 Listed

• Designed for commercial access-control applications

Electrical Specifications

Input Voltage: 120VAC, 60Hz
Maximum Input Current: 3.5A
Input Fuse: 5A / 250V
Output Voltage: Selectable 12VDC or 24VDC
Maximum Output: 4A Continuous
Auxiliary Output: 1A Class 2 Power-Limited, Unswitched
Output Type: Filtered & Regulated DC

Battery Backup

The 4204NX includes an integrated battery charging and standby circuit.

It can accommodate compatible 7Ah, 12V sealed lead-acid or gel-type batteries, with one or two batteries used depending on the selected 12VDC or 24VDC configuration.

When AC power is lost, the system provides instantaneous battery failover.

Batteries are not included.

Fire Alarm Interface

The built-in fire-alarm disconnect supports:

• Supervised operation

• Latching configuration

• Non-latching configuration

• 10K end-of-line resistor supervision

This allows compatible locking equipment to respond appropriately when integrated with a building fire-alarm system.

Supervision & Protection

The 4204NX provides several system-monitoring and protection features, including:

• AC Failure Form C Contacts

• Battery Form C Contacts

• Low DC power shutdown

• Battery deep-discharge protection

• Overvoltage protection

• Input power LED

• DC output LED

• Battery fault / disconnected battery LED

These features help simplify troubleshooting and improve reliability in critical access-control installations.

Common Applications

• Magnetic Locks

• Electric Strikes

• Electrified Locksets

• Electric Exit Devices

• Access-Control Systems

• Door Interlock Systems

• Request-to-Exit Devices

• Card Reader Systems

• Keypad Systems

• Door Sensors

• Commercial Security Doors

• Institutional Access Control

Product Specifications

Brand: Dortronics
Model: 4204NX
Product Type: Power Supply / Battery Charger
Input: 120VAC, 60Hz
Output: 12VDC or 24VDC Selectable
Maximum Current: 4A Continuous
Battery Backup: Supported
Battery Capacity: Up to 7Ah
Fire Alarm Disconnect: Yes
Supervision: AC & Battery
Listing: UL 294
Application: Access Control & Electrified Door Hardware

The 4204NX is classified as a Class 2 power-limited stand-alone power supply and is suitable for compatible sensors, switches, LEDs, electromagnetic locks, electric strikes, and other electro-mechanical access-control devices.

Important: Verify total system current draw, required voltage, battery requirements, fire-alarm interface, locking hardware, and applicable electrical and life-safety requirements before installation.