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    • Home  / Product Manuals & Documentation
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    SECO-LARM ST-Series Power Supply/Chargers & Transformers — Specifications

    August 31, 2026 2 min read

    Specifications for SECO-LARM's ST-1206/ST-2406 series power supply/chargers and matching open-frame transformers, with a full transformer selection guide.

    💾 Download Original PDF
    Full text manual (for reference)

    Specification sheet for SECO-LARM's ST-Series Power Supply/Chargers and matching Open-Frame Transformers — low-voltage AC-to-DC power converters with built-in backup battery charging, commonly used in access control and alarm installations.

    Power Supply/Charger Models

    • ST-1206-1.5AQ — 1.5A continuous, 6/12 VDC
    • ST-2406-2AQ — 1.5A continuous, 6/12/24 VDC
    • ST-2406-3AQ — 2.5A continuous, 6/12/24 VDC
    • ST-2406-5AQ — 4.0A continuous, 6/12/24 VDC
    • ST-2406-7AQ — 7.0A continuous, 6/12/24 VDC
    • ST-2406-10AQ — 9.0A continuous, 6/12/24 VDC

    Features

    • Converts low-voltage AC input power to low-voltage DC output power
    • Regulated and filtered output voltage
    • Short circuit protection
    • Thermal protection and compensation
    • Built-in backup battery charger, switches automatically on power loss
    • Fused protection for the battery charger
    • 2 LEDs indicating AC power input and DC power output status
    • Compatible with lead-acid or gel-type rechargeable batteries
    • Reverse polarity protected
    • Includes foam tape and battery terminals for easy installation

    Power Supply Specifications

    Model # DC Voltage Current (continuous) Current (peak) Maximum Charge Current PCB Size
    ST-1206-1.5AQ 6/12 1.5A 2.0A 6V=200mA, 12V=400mA 2-7/8" x 2-1/4" x 1" (73 x 57 x 25 mm)
    ST-2406-2AQ 6/12/24 1.5A 3.0A 6V=180mA, 12V=350mA, 24V=700mA 2-7/8" x 2-1/2" x 1-3/8" (73 x 64 x 35 mm)
    ST-2406-3AQ 6/12/24 2.5A 3.0A 6V=180mA, 12V=350mA, 24V=700mA 3-3/8" x 2-7/8" x 1-5/16" (81 x 73 x 33 mm)
    ST-2406-5AQ 6/12/24 4.0A 5.0A 6V=180mA, 12V=350mA, 24V=700mA 3-3/4" x 2-7/8" x 1-9/16" (95 x 73 x 40 mm)
    ST-2406-7AQ 6/12/24 7.0A 7.5A 6V=180mA, 12V=350mA, 24V=700mA 5-1/2" x 5-1/8" x 2-11/64" (140 x 130 x 55 mm)
    ST-2406-10AQ 6/12/24 9.0A 10.0A 6V=180mA, 12V=350mA, 24V=700mA 5-1/2" x 5-1/10" x 2" (140 x 130 x 51 mm)

    Transformer Selection Guide

    SECO-LARM carries a full line of Open-Frame Transformers designed to complement the ST-2406 Series Power Supply/Chargers. Use the table below to find the correct transformer for a specific power supply and output voltage combination.

    Output ST-1206-1.5AQ ST-2406-2AQ ST-2406-3AQ ST-2406-5AQ ST-2406-7AQ ST-2406-10AQ
    6VDC 12VAC/20VA 12VAC/20VA ST-UV24-W50Q, 24VAC/50VA ST-UV16-W100Q, 16VAC/100VA ST-UVDA-W180Q, 24-28VAC/180VA ST-UV16-W100Q, 16VAC/100VA
    12VDC 16VAC/40VA 16VAC/40VA ST-UVDA-W100Q, 24-28VAC/100VA ST-UV-W100Q, 16VAC/100VA ST-UVDA-W180Q, 24-28VAC/180VA ST-UVDA-W180Q, 24-28VAC/180VA
    24VDC N/A ST-UV24-W50Q, 24VAC/50VA ST-UVDA-W100Q, 24-28VAC/100VA ST-UVDA-W180Q, 24-28VAC/180VA 24-28VAC/210VA 28VAC/350VA

    Open-Frame Transformer Models

    • ST-UV24-W50Q — 24VAC / 50W
    • ST-UV16-W100Q — 16VAC / 100W
    • ST-UVDA-W100Q — 24/28VAC / 100W
    • ST-UVDA-W180Q — 24/28VAC / 180W

    Transformer Features

    • Shielded windings to reduce electromagnetic interference (EMI)
    • Selectable input voltage
    • Selectable output voltage on some models

    Transformer Specifications

    Model Output Voltage Amperage VA Input Voltage
    ST-UV24-W50Q 24VAC 2.1 50VA 120VAC or 240VAC 50/60Hz
    ST-UV16-W100Q 16VAC 6.3 100VA 120VAC or 240VAC 50/60Hz
    ST-UDVA-W100Q 24VAC 4.2 100VA 120VAC or 240VAC 50/60Hz
    ST-UDVA-W100Q 28VAC 3.6 100VA 120VAC or 240VAC 50/60Hz
    ST-UVDA-W180Q 24VAC 7.5 180VA 120VAC or 240VAC 50/60Hz
    ST-UVDA-W180Q 28VAC 6.4 180VA 120VAC or 240VAC 50/60Hz
    ST-UV28-T350Q 28VAC 12.5 350VA 120VAC or 240VAC 50/60Hz

    SECO-LARM® U.S.A., Inc. — 16842 Millikan Avenue, Irvine, CA, 92606. Phone: (949) 261-2999 | (800) 662-0800. Fax: (949) 261-7326. Website: www.seco-larm.com | Email: sales@seco-larm.com. SECO-LARM reserves the right to change prices and specifications without notice and is not responsible for misprints.