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Schlage SCPS904-4RL-BBK-KL

Schlage PS904-4RL-BBK-KL 4-Amp Power Supply with 4-Relay Logic Board, Battery Backup, and Key Lock

Quick Product Details

  • 4-amp output at 12 or 24 VDC, field selectable with jumper
  • Includes 900-4RL board: field-programmable 4-relay logic for interlocks, auto operators, and time delays
  • Includes 900-BBK battery backup kit with two 7A/hour batteries for continuous operation during outages
  • Key lock cover secures cabinet against unauthorized access
  • UL 294, ULC-S318, Class 2, RoHS, and FCC Part 15 certified
  • Factory configured; field expandable with additional option boards
  • Grey baked enamel NEMA Grade 1 cabinet, 14
Price: $1,366.00 /each

SKU: SCPS904-4RL-BBK-KL

The PS904-4RL-BBK-KL brings together Schlage's 4-amp power supply platform with three key additions in one factory-configured unit. The 900-4RL relay board gives installers field-programmable control over security interlocks, automatic operators, and time delay functions. The 900-BBK battery backup kit keeps the system running through power outages using two included 7A/hour batteries. The key lock cover secures the cabinet from unauthorized access. Output voltage is selectable between 12 and 24 VDC with a jumper, and the polarized plug-in board connectors keep installation and future expansion straightforward.

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Overview

The Schlage PS904-4RL-BBK-KL is a factory-configured 4-amp access control power supply built for commercial and institutional installations that need relay logic, battery backup, and a secure enclosure in one package.

The PS904 base unit delivers clean, filtered, and regulated output at either 12 or 24 VDC, selected by an internal jumper. It uses overload protection with a current-limited foldback circuit to prevent downstream devices from being damaged by excessive current draw. The universal 120-240 VAC input and two polarized option board connectors keep installation simple and future expansions practical without the need for racks or side connectors.

The included 900-4RL board adds four independently controllable relay outputs with integrated logic. The board is field programmable and supports individual or sequential operation, making it suitable for security interlocks, automatic door operators, and time delay functions. Relay outputs are rated 30 VDC at 3 amps dry and 12/24 VDC at 3 amps wet when AC powered.

Product at A Glance

Factory-configured with everything you need for a complete access control power installation. The 4RL relay board handles interlocks, auto operators, and time delays without extra programming hardware. The BBK kit means the system stays online during a power outage, batteries included. The key lock cabinet keeps it all secured from unauthorized access. Field expandable with additional option boards if needs change.
Voltage(s) 12 or 24 VDC output, field selectable; 120/240 VAC universal input
Output rating 4 amps, Class 2, filtered and regulated
Included option board 900-4RL: 4-relay with integrated logic, field programmable
Battery backup 900-BBK included: backup board plus two 7A/hour batteries
Cabinet type Grey baked enamel, NEMA Grade 1, hinged cover with key lock

More Info

The PS904 is part of Schlage's PS900 Series, which covers the 2-amp PS902, the 4-amp PS904, and the 6-amp PS906. All models share the same enclosure design, option board system, and wiring layout, which makes it straightforward for installers already familiar with one model to work with the others. The PS914 from Von Duprin is the recommended choice when high in-rush current is needed, such as with Von Duprin EL and Falcon EL exit devices. The PS904 is not rated for those applications.

The 900-4RL board inside this configuration supports dry contact inputs on I1 through I4 using a signal common connection. Outputs O1 through O4 are Form C contacts. The board draws a maximum of 0.18 amps from the power supply output to operate, which factors into the usable current available for downstream devices. Combined output across all relay outputs cannot exceed the power supply's total 4-amp rating or 6 amps per the board's combined output limit, whichever is lower.

Battery fuse replacement uses a 7.5A 32V ATO blade-style fuse. AC primary fuse is a T4A 250VAC 5x20mm type. AC input termination is a 3-position terminal block rated for up to 10 AWG wire. DC output termination is a 2-position terminal block rated for up to 12 AWG wire.

The unit carries a 10-year mechanical warranty through Allegion's commercial warranty program.

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