View the PS904 4-amp power supply. It delivers a clean and consistent output to your access control system, protecting downstream devices.
View the PS904 4-amp power supply. It delivers a clean and consistent output to your access control system, protecting downstream devices.
Brand: Schlage
Category: Power Supplies
Manufacturer Part Number: PS904
Source: Official product page
The Schlage PS904 is a 4-amp, UL 294 Class 2 filtered and regulated power supply for electronic access control systems, offering field-selectable 12 or 24 VDC output, field-installable option boards, and separate battery management to protect downstream devices.
| Model | PS904: 4 amp Class 2 filtered and regulated power-limited output |
|---|---|
| Input voltage | 120/240 VAC, 50/60 Hz, universal input |
| Output voltage | 12 or 24 VDC, field selectable with jumper |
| Regulation | 5% regulation, 240 Vpp max ripple |
| Output protection | current-limited foldback circuit |
| Operating temperature | 32 to 120 F (0 to 49 C) |
| Cabinet dimensions | 14"H x 12"W x 4"D |
| Cabinet finish | grey, baked enamel |
| Cabinet grade | NEMA Grade 1 |
| Weight | 9 lbs (add 4 lbs per battery) |
| AC primary fuse | T4A, 250VAC, 5x20mm |
| Battery fuse | 7.5A 32V ATO blade style |
| Certifications | UL 294, ULC-S318, RoHS, FCC Part 15, Class 2 |
| Low-voltage wiring | Connection count needs review |
| Preparation | The enclosure must be mounted firmly to a solid surface indoors, using hardware suitable for that surface. Installation must follow the applicable electrical and fire codes. The enclosure measures 14" H x 12" W x 4" D and has eight 1/2" or 3/4" knockouts. Mounting uses 4 screws, with 2 top holes marked first. The door is secured with 2 screws or with the optional 900-KL keylock. The 900-KL needs a knockout removed to fit the key cylinder. |
| Electrical | The base PS904 output is rated 4 Amp DC at 12/24 VDC, selected by its output-voltage jumper. Keep the AC mains input, DC load wiring and dry status contacts distinct. Maintain the manual's minimum separation between AC and DC wiring, and between power-limited and non-power-limited wiring. The AC monitor provides dry status contacts; its contact rating is separate from supply output capacity. Battery backup, fire-alarm and distribution/relay boards are optional and must follow their own installation instructions. Select connected loads, voltage setting, optional boards and monitoring contacts before specifying field cable gauge, route or physical jacket/run quantities. Terminal positions and maximum terminal wire capacity do not establish those quantities. Manufacturer photographs may illustrate optional boards or batteries; select the required accessories separately. |
| Preparation required | Yes |
| Electrical wiring required | Yes |
| Conditional connections | AC mains input to the power supply: cable runs quantity unspecified; conductor count unspecified; wire type not documented; size unspecified; shielding unspecified; rating 10 AWG max terminal capacity; endpoints AC supply (120/240 VAC, 50/60 Hz) to PS904 AC input terminal block; when Installation configuration is Base product. Ground, neutral and hot conductors are shown on the AC input terminal block (3-position, 10 AWG max wire capacity). The number of cable runs is not documented.; 12/24 VDC output to powered devices: cable runs quantity unspecified; conductor count unspecified; wire type not documented; size unspecified; shielding unspecified; rating 12 AWG max terminal capacity; endpoints PS904 12/24 VDC output terminals (+/-) to Connected electrified device(s); when Installation configuration is Base product, where DC output is connected to powered devices. The 2-position terminal block takes 12 AWG max. The AC and DC wiring need at least 1/4" separation, and power-limited and non-power-limited wiring must also be separated.; AC monitor Form C dry contacts (NC/C/NO) for AC status: cable runs quantity unspecified; conductor count unspecified; wire type not documented; size unspecified; shielding unspecified; rating unspecified; endpoints PS904 AC monitor terminals to External monitoring device; when Installation configuration is Optional accessory selected: IF AC status monitoring is used. The contacts are active when AC is present and the F1 fuse is not open. The external endpoint and the number of conductors used are not documented.; 900-BB battery backup board battery leads: cable runs quantity unspecified; conductor count unspecified; wire type not documented; size unspecified; shielding unspecified; rating unspecified; endpoints 900-BB battery board to Battery 1 and Battery 2; when Installation configuration is Internal accessory connection; not field cable: Optional accessory selected: IF the 900-BB battery backup is selected. The red (+) and black (-) leads from the board attach to the batteries inside the enclosure. These are not field cable runs.; Battery supervision Form C dry contacts: cable runs quantity unspecified; conductor count unspecified; wire type not documented; size unspecified; shielding unspecified; rating unspecified; endpoints Battery supervision terminals (NO/C/NC) to External monitoring device; when Installation configuration is Optional accessory selected: IF the 900-BB battery backup is selected and battery supervision is used. The external endpoint and the number of conductors used are not documented. |
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