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    AI Overview
    Sp5-40 Surge Protection Device T2 Class Surge Arrester SPD ...
    40kA Power Surge Protective Devices (SPDs) are critical components designed to protect electrical systems and sensitive equipment from voltage spikes, typically handling a maximum surge current of
    40
    kA
     per phase. These are commonly used in residential, commercial, and industrial, often in Type 2, or Type 1+2 configurations. 
    This video explains the basics of a Surge Protection Device (SPD) and how it works:
    Related video thumbnail
    39s
    What is a Surge Protection Device (SPD)? and How Do They ...
    eFIXX
    YouTube• Jun 10, 2023
    Key Features and Types 
    • Capacity: Rated for a 40kA maximum discharge current (
      Imaxcap I sub max end-sub
      𝐼max
      ).
    • Types: Available in Type 1 (main service panel), Type 2 (sub-panels), or combination Type 1+2.
    • System Compatibility: Suitable for various AC power systems (3-phase 400Y/230V, 1-phase) and DC systems (up to 1000V DC).
    • Monitoring: Frequently equipped with green/red status indicator LEDs and remote signaling contacts for maintenance.
    • Installation: Designed for 35mm DIN rail mounting. 
    Common Applications 
    • Industrial, commercial, and residential main distribution boards.
    • Solar PV DC side protection.
    • Protection against switching transients and induced lightning strikes. 
    Common Examples and Providers 
    • 40kA Surge Protective Device - Larson Electronics (Type 1, NEMA 4X, $662.47).
    • ABB OVRT23N40550PTSU Type 2 3P+N SPD.
    • 40KA AC Power SPD - CHENZHU (Hot-pluggable type 2).
    • Various 2P-4P Type 2 40kA units (e.g., LSP) are widely available on sites like Amazon or eBay. 
    You can watch this video to learn how to install a surge protection device in a distribution board:
    Related video thumbnail
    56s
    What is SPD (Surge Protection Device) and how to install it ...
    ElectricalEngineeringPlanet
    YouTube• Jul 27, 2024
    Note: For maximum effectiveness and safety,ensure the voltage rating (
    Uccap U sub c end-sub
    𝑈𝑐
    ) is appropriate for your electrical system and that the unit is installed by a qualified professional.     
    Show more

    Web results

    Aexit AC 385V Power Protection 40KA 3 Phase Lighting ...


    Amazon.com
    https://www.amazon.com › Aexit-Protection-Lightning-...
    Amazon.com
    https://www.amazon.com › Aexit-Protection-Lightning-...
    Product Name : Surge Protector;Model : LYD2-C/3;Pole : 3 Phase; Voltage(Uc) : AC 385V;Maximum Dishcharging Current : 40KA;Nominal Dishcharging Current (In) ...Read more
    30-day returns

    What is A 40KA Type 2 SPD? Features and Installation Points ...


    britecelectric.com
    https://www.britecelectric.com › blog › what-is-a-40ka-...
    britecelectric.com
    https://www.britecelectric.com › blog › what-is-a-40ka-...
    Dec 18, 2025 — 40KA Type 2 SPD is surge protection device installed in the main distribution panel, protection against induced lightning strikes and ...

    DS43S-480 - UL TYPE 1 SPD - Imax 40kA - In 20kA


    citel.us
    https://citel.us › AC POWER › DIN RAIL AC
    citel.us
    https://citel.us › AC POWER › DIN RAIL AC
    UL1449 TYPE 1 LISTED SPD; MOV Technology; 40kA Surge Current Rating; Visual fault indicator and remote contacts; 10-Year warranty.Read more
    $237.00 · Free delivery over $1,000 · 30-day returns

    40KA AC Power SPD


    Shanghai Chenzhu Instrument CO., LTD.
    https://www.chenzhuisolator.com › products › 40ka-ac-...
    Shanghai Chenzhu Instrument CO., LTD.
    https://www.chenzhuisolator.com › products › 40ka-ac-...
    This 40kA power SPD features a hot-pluggable design that enables true zero-downtime maintenance. Unlike our 80kA surge protector, which is designed for main ...Read more
    $100.00

    abb ovrt23n40440ptsu - surge protect - ovr spd 3p+n 40ka ...


    All Data Resource
    https://www.alldataresource.com › ... › ABB
    All Data Resource
    https://www.alldataresource.com › ... › ABB
    ABB OVRT23N40440PTSU - SURGE PROTECT - OVR SPD 3P+N 40KA 440V P. Part Number: 616932. 0 Review(s) 0 0 5. Write a ReviewRead more
    $885.72$984with code
    google (Copy)google
    )
    Copied(
     · In stock · $10.99 delivery · 90-day returns

    DOWIN YD40K320 SPD For Three Phase Power Supply ...


    eBay
    https://www.ebay.com › itm
    eBay
    https://www.ebay.com › itm
    DOWIN YD40K320 SPD For Three Phase Power Supply 255V~ 40KA. DOWIN. SPD FOR POWER SUPPLY. YD40K320. YD40K255. UC: 255V~. IN: 20KA (8/20µS). IMAX: 40KA (8/20µS).Read more
    $131.99 · In stock · $7.95 delivery

    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 — Type 2 40kA SPD from LSP is mainly installed in branch circuits after the main power supply for extra protection.

    2P DC Surge Protector SPD 20KA-40KA DC 12V 24V 48V ...


    Amazon.com
    https://www.amazon.com › PYKFVTGL-Protector-20K...
    Amazon.com
    https://www.amazon.com › PYKFVTGL-Protector-20K...
    Ultimate Protection: Our surge protector is designed to shield electrical systems and load devices from the damaging effects of lightning strikes and sudden ...
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    People also ask
    What is the difference between 20kA and 40kA SPD?
    Surge Handling Capacity: The most obvious difference is the amount of current they can handle. A 40kA surge protector can handle twice as much current as a 20kA one. This means it can protect your equipment from more powerful surges.Aug 12, 2025

    What is the difference between a 40kA and a 20kA surge protector? - Blog


    Zhejiang Handele Electric Co., Ltd.
    https://www.handelespd.com › blog › what-is-the-differe...
    Zhejiang Handele Electric Co., Ltd.
    https://www.handelespd.com › blog › what-is-the-differe...
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    Web results

    Question about DC Surge Protection Devices for Solar ...


    DIY Solar Power Forum
    https://diysolarforum.com › threads › question-about-d...
    DIY Solar Power Forum
    https://diysolarforum.com › threads › question-about-d...
    Jun 6, 2025 — Type 1 PV SPDs exist, but I only found 10kA rated ones for PV. I'm not sure why, because you can easily get type 1 for 40kA for AC power.Read more

    275v type 2 40ka ac power surge protective device spd


    Anhui Jinli Electric Tech. Co., Ltd
    https://www.jinlispd.com › 275v-type-2-40ka-ac-power...
    Anhui Jinli Electric Tech. Co., Ltd
    https://www.jinlispd.com › 275v-type-2-40ka-ac-power...
    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 ...Read more
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