Schlage PS904 Power Supply

The Schlage PS904 Power Supply is a versatile and reliable 4 amp power solution designed to support the evolving needs of modern electronic access control systems. Engineered for flexibility, the PS904 can be factory configured or expanded in the field using a wide range of plug-in option boards, making it ideal for electric strikes, mag locks, card readers, delayed egress systems, and other electrified hardware applications.

Built with separate battery management technology, the PS904 delivers clean and consistent regulated power to protect sensitive downstream devices while maintaining dependable performance during continuous operation. Its flat mounting board, polarized locking connectors, and accessible terminal blocks simplify installation and future system upgrades.

Perfect for commercial buildings, schools, healthcare facilities, offices, and security applications requiring dependable low-voltage power distribution.

Key Features

• 4 amp Class 2 filtered and regulated power-limited output
• Field selectable 12 or 24 VDC output via plug-in jumper
• Universal 120–240 VAC input compatibility
• Separate battery management for stable voltage regulation
• Battery backup capability for uninterrupted operation
• Overload protection with current-limited fold-back circuit
• Plug-and-play option board compatibility
• LED status indicators for AC input and DC output monitoring
• Hinged lockable enclosure with optional key lock cover
• Supports electric strikes, magnetic locks, card readers, and access control accessories

Power Output

• 4 amp regulated output
• 12 or 24 VDC field selectable
• Switching power supply with 5% regulation
• 240Vpp maximum ripple
• Overload and short circuit protection
• Continuous power with optional battery backup

Input Specifications

• Universal 120/240 VAC input
• 50/60 Hz operation
• Fused primary input protection
• AC input monitoring with isolated SPDT contacts
• Automatic voltage selection for battery backup systems

Compatible Option Boards

• 900-BB – Battery backup option board
• 900-BBK – Battery backup kit with two 7Ah batteries
• 900-FA – Emergency fire alarm interface module
• 900-2RS – 2 relay sequential control board
• 900-4R – 4 relay independent control board
• 900-4RL – 4 relay programmable logic board
• 900-8F – 8 fused output distribution board
• 900-8P – 8 PTC protected output board
• 900-KL – Key lock cover kit

Cabinet & Environmental Specifications

• Cabinet dimensions: 14" H x 12" W x 4" D
• Grey baked enamel finish
• Hinged cover with lockdown screws
• NEMA Grade 1 enclosure
• Operating temperature: 32°F to 120°F (0°C to 49°C)
• Weight: 9 lbs. (additional 4 lbs. per battery)

Ideal Applications

• Access control systems
• Electric strikes
• Magnetic locks
• Delayed egress devices
• Card readers and controllers
• Commercial security systems