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    An AI Overview is not available for this searchCan't generate an AI overview right now. Try again later.
    AI Overview
    A 40kA Surge Protective Device (SPD) is a, usually DIN-rail mounted, device designed to protect electrical systems from sudden, high-voltage surges (up to 40,000 Amperes) caused by lightning or switching operations. Typically utilized in residential, commercial, or industrial sub-distribution boards, these Type 2 or Type 1/2 devices safeguard sensitive electronics and equipment. 
    This video explains how a Surge Protection Device (SPD) works:
    Related video thumbnail
    54s
    Electro Academy
    YouTube• Oct 1, 2021
    Key features and considerations include: 
    • Protection Level: 40kA is the maximum surge current capacity (
      Imaxcap I sub m a x end-sub
      𝐼𝑚𝑎𝑥
      ), often accompanied by a lower nominal discharge current (
      Incap I sub n
      𝐼𝑛
      , e.g., 15kA or 20kA).
    • Components: Most employ Metal Oxide Varistor (MOV) technology to divert excess current.
    • Design: Often pluggable for easy maintenance and replacement without disconnecting wiring.
    • Installation: Installed on DIN rails in electrical panels; some models, like the Square D by Schneider Electric, offer versatile mounting for panel-side protection.
    • Indicators: Diagnostic LEDs (e.g., green for good, red for replace) allow for easy monitoring of the unit’s health. 
    Popular models include 1-pole (e.g., Hager SPB140D) or 3-pole/3-phase configurations for robust industrial protection. 
    • Surge-Trap® Pluggable STPT2 Series - 40kA - Mersen
      Surge-Trap® Pluggable STPT2 Series - 40kA Surge Protection | Mersen. ... IEC SPD Type, Class II. UL SPD Type, Type 2 Component Ass...
      Mersen
    • GSP9-C40 40ka Surge Protection Device
      The GSP9-C40 is a surge protection device that can be used in sub-distribution boards. It has the following specifications: * **Ho...
      GEYA Electrical Equipment Supply
    • MX9SP340 - Surge Protection Device, MAX9, SPD, 3P, 40kA
      The maximum discharge current is 40kA. The nominal discharge current is 15kA. It ensures protection of electronic devices against ...
      Schneider Electric
    • SPD 40KA-80KA 1P Surge Arrester Protection Device Electric ...
      Product Summary: PYKFVTGL SPD 40KA-80KA 1P Surge Arrester Protection Device Electric House Surge Protector B ~385V AC * Stable Per...
      Amazon.com
    • The Ultimate Protection: Type 2 40kA Surge Protector - LSP
      Jul 3, 2025 — Where Is a 40kA SPD Typically Used? A 40kA Surge protector (SPD) is used in many places to protect electrical systems from sudden ...
      lsp.global
    • Hager SPB140D 1 Pole 40kA Surge Protection Device With ...
      Sep 4, 2022 — Hager SPB140D 1 Pole 40kA Surge Protection Device With Replaceable Cartridge
      YouTube·Sparky Direct
      16s
    • 3 Pole Surge Protection Device | 40kA
      Jan 31, 2021 — 3 Pole Surge Protection Device | 40kA
      YouTube·Sparky Direct
      12s
    • Square D Surgelogic 40-kA Indoor and Outdoor Surge Protective ...
      The Square D by Schneider Electric Hardwired Type 1 Surge Protective Device is suitable for both indoor and outdoor applications. ...
      Lowe's
    • Surge-Trap® Pluggable STPT2 Series - 40kA - Mersen
      Surge-Trap® Pluggable STPT2 Series - 40kA Surge Protection | Mersen. ... IEC SPD Type, Class II. UL SPD Type, Type 2 Component Ass...
      Mersen
    • GSP9-C40 40ka Surge Protection Device
      The GSP9-C40 is a surge protection device that can be used in sub-distribution boards. It has the following specifications: * **Ho...
      GEYA Electrical Equipment Supply
    • MX9SP340 - Surge Protection Device, MAX9, SPD, 3P, 40kA
      The maximum discharge current is 40kA. The nominal discharge current is 15kA. It ensures protection of electronic devices against ...
      Schneider Electric
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    My Ad Center

    Web results

    40kA Surge Protective Device - 480V Delta 3PH, 50/60Hz


    Larson Electronics
    https://www.larsonelectronics.com › product › 40ka-surg...
    Larson Electronics
    https://www.larsonelectronics.com › product › 40ka-surg...
    This Type 1 SPD is compatible with three-phase 480V AC Delta, 50/60Hz and is rated at 40kA maximum surge current per phase.

    Surge-Trap® Pluggable STPT2 Series - 40kA


    Mersen
    https://www.mersen.com › ... › Surge Protection
    Mersen
    https://www.mersen.com › ... › Surge Protection
    STP T2 40 is the series of Type 2/Class II devices for discharging voltage surges, in accordance with EN/IEC 61643-11.Read more
    surge spd 40ka from www.mersen.com

    Arrester T1 T2 SPD 275V 20kA 40kA Surge Protection ...


    Amazon.com
    https://www.amazon.com › Arrester-Surge-Protection-D...
    Amazon.com
    https://www.amazon.com › Arrester-Surge-Protection-D...
    Top highlights · Brand. OPXTEEGW · Color. 20-40KA · Voltage. 275 Volts · Special Feature. Surge Protection · Shape. Rectangle · Item Weight. 50 Grams. Surge ...Read more
    surge spd 40ka from www.amazon.com

    GSP9-C40 40ka Surge Protection Device


    GEYA Electrical Equipment Supply
    https://www.geya.net › product › gsp9-c40-40ka-surge-p...
    GEYA Electrical Equipment Supply
    https://www.geya.net › product › gsp9-c40-40ka-surge-p...
    GSP9-C40 40ka Surge Protection Device Welcome to the future of energy renewable, Geya Electrical's foray into providing Solar Energy systems.
    surge spd 40ka from www.geya.net

    SDSA4040D - Surge protection device, Surgelogic, 50kA ...


    Schneider Electric
    https://www.se.com › ... › Square D™ SDSA Type SPDs
    Schneider Electric
    https://www.se.com › ... › Square D™ SDSA Type SPDs
    Ideal for residential and light commercial use, these SPDs provide a dependable first layer of surge protection. It is designed to protect electrical service ...Read more
    surge spd 40ka from www.se.com

    The Ultimate Protection: Type 2 40kA Surge Protector - LSP


    lsp.global
    https://lsp.global › the-ultimate-protection-type-2-40ka-s...
    lsp.global
    https://lsp.global › the-ultimate-protection-type-2-40ka-s...
    Jul 3, 2025 — A 40kA Surge Protector is a tool that guards electrical systems. It protects them from sudden voltage increases, often caused by lightning or power changes.Read more
    surge spd 40ka from lsp.global

    Surge Protection Device, Type 2, 20/40/60/80kA


    ATO.com
    https://www.ato.com › ... › Surge Protection Devices
    ATO.com
    https://www.ato.com › ... › Surge Protection Devices
    With max. discharge current of 20kA / 40kA / 60kA / 80kA, the SPD is designed in accordance with IEC Class II, reliable performance and low price.Read more
    surge spd 40ka from www.ato.com
    $62.63 · In stock · 5.0(2) · Free delivery · 30-day returns

    Square D SDSA4040 Surge Protection Device T1 Sdsa ...


    Gordon Electric Supply, Inc.
    https://www.gordonelectricsupply.com › Square-D-Sdsa...
    Gordon Electric Supply, Inc.
    https://www.gordonelectricsupply.com › Square-D-Sdsa...
    Technical Description: 3 Inch W X 3.39 Inch D X 3.6 Inch H Size; Electrical Panel, Meter/Socket/Inside Electrical Control Cabinet Used on; ...Read more
    surge spd 40ka from www.gordonelectricsupply.com
    $261.00 · In stock · $18.52 delivery · 30-day returns
    People also ask
    What should you never plug into a surge protector?
    An error has occurred. Please try again later.
    Is 25kA surge protection enough?
    The answer to “How much kA do I need for a surge protector?” is different from residential settings. Factories, data centers, and hospitals typically require Type 1 or Type 1+2 SPDs with Iimp ≥ 25kA (10/350 µs) at the main service entrance.Feb 5, 2026

    Selection Guide: How Much kA Do I Need for a Surge Protector - LSP


    LSP
    https://lsp.global › how-much-ka-do-i-need-for-surge-pr...
    LSP
    https://lsp.global › how-much-ka-do-i-need-for-surge-pr...
    What is SPD in surge protection?
    Surge Protective Devices
    Surge Protective Devices (SPD) Surge Protective Devices (SPD) are used to protect the electrical installation, which consists of the consumer unit, wiring and accessories, from electrical power surges known as transient overvoltages.

    Surge Protective Devices (SPD) - IET Electrical


    IET Electrical
    https://electrical.theiet.org › consumer-guidance › surge-...
    IET Electrical
    https://electrical.theiet.org › consumer-guidance › surge-...
    What is a 50kA surge protector good for?
    Engineered for easy installation at your main electrical panel, this 50kA surge protector is ideal for residential and light commercial use, including HVAC systems, mini split AC units, and other high-value equipment.

    Schneider Electric HEPD50 Surge protection device, HEPD, 50kA, 120 ...


    Amazon.com
    https://www.amazon.com › Schneider-Electric-HEPD50-...
    Amazon.com
    https://www.amazon.com › Schneider-Electric-HEPD50-...

    Web results

    3 phase spd 40kA surge protection device


    Anhui Jinli Electric Tech. Co., Ltd
    https://www.jinlispd.com › 3-phase-spd-40ka-surge-pro...
    Anhui Jinli Electric Tech. Co., Ltd
    https://www.jinlispd.com › 3-phase-spd-40ka-surge-pro...
    AC power surge protective device is used in AC power supply system (50/60Hz) and low-voltage control system to protect from lightning striker and transient over ...Read more
    surge spd 40ka from www.jinlispd.com

    AC 350V 40kA spd manufacturer surge protective device 2P


    eBay
    https://www.ebay.com › itm
    eBay
    https://www.ebay.com › itm
    AC 350V 40kA spd manufacturer surge protective device 2P ; Voltage protection level Up (kV). ≤1.7kV ; Max. backup fuse (A). 100 (gG) ; Response time tA. ≤25ns.Read more
    surge spd 40ka from www.ebay.com
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