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    Leviton 51120-3R — NEMA 3R Outdoor Panel Mount Surge Protective Device Specifications

    September 08, 2026 2 min read

    Product specifications for the Leviton Cat. No. 51120-3R NEMA 3R-rated outdoor panel mount Surge Protective Device (SPD), a UL 1449 transient voltage surge suppressor for outdoor installations.

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    Full text manual (for reference)

    Product specifications for the Leviton Cat. No. 51120-3R NEMA 3R-rated outdoor panel mount Surge Protective Device (SPD) — a UL 1449 transient voltage surge suppressor for outdoor equipment locations.

    Application

    The Cat. No. 51120-3R outdoor panel mount SPD is designed for use at the service entrance, utility kWh meter, or other outdoor equipment locations in homes, pumping stations, radio towers, and small businesses where protection from high-energy, high-voltage transients is desired. It features a NEMA 3R-rated steel enclosure for protection against falling rain, sleet, and external ice formations.

    Standards & Compliance

    • UL 1449 Transient Voltage Surge Suppressor listing
    • Tested to ANSI/IEEE C62.41 standards for Categories A, B, and C environments
    • Agency Approval: UL Standard 1449 / CSA
    • Backed by Leviton's 5-year limited warranty

    Functional Overview

    • Circuit Type: High-energy 40mm metal-oxide varistor circuitry protecting each phase
    • Configuration: Used for 120/240V single-phase operation
    • Diagnostic LEDs: One diagnostic LED per phase; illuminates while the unit is powered ON, indicating each phase of the SPD is active and operating properly. Failure of the green LED to illuminate indicates line power failure and the unit should be replaced (use replacement module No. 120-3R).

    Performance

    Parameter Value (Cat. No. 51120-3R, 120/240V Single-Phase)
    Rated Single Pulse Transient Energy (10 x 1000 µs Joules) 950J
    Max. Single Pulse Transient Current (8 x 20 µs, Amperes Peak) 50,000A
    Clamping Response Time Instantaneous
    Cat. B3 Combination Wave (8 x 20 µs) Clamping Voltage 640V
    UL 1449 Rating (L-N) 800V

    Electrical Requirements

    Parameter Value
    Line Voltage 120VAC
    Max. Continuous Line-Neutral Voltage (VRMS) 180V
    Phase/Wire Designation L1 – Black, L2 – Red, N – White, G – Green
    Operational Frequencies 50, 60Hz

    Physical Specifications

    Spec Value
    Operating Temperature Range -10°C to 60°C
    Storage Temperature Range -20°C to 85°C
    External Enclosure Dimensions 8.0" (203.2mm) x 6.0" (152.4mm) x 4.0" (101.6mm), NEMA-3R steel enclosure
    Internal Housing Dimensions 3.0" (76.2mm) x 3.0" (76.2mm) x 2.7" (68.58mm), impact-resistant fire-retardant plastic

    Mounting

    The module is installed by engaging the module mounting clip on the left side of the rail. The right side is then pressed down until locked. The module slides down until it contacts the ground block, aligning the LEDs with the cover lenses. The pigtail ground wire is then connected to a terminal on the rail-mounted ground block. The plastic enclosure face is secured to a DIN rail module to permit LED visibility and provide an easy means for replacement.

    Warranty

    5-year limited warranty.

    Manufacturer

    © 1996 Leviton Manufacturing Co., Inc. All Rights Reserved.