Products catalog

Home/Product Catalog/Electrical distribution and installation/Surge Protection and Lightning Protection/Surge Arresters | Electrical Equipment Protection from Lightning Strikes/Surge protectors | Protection from direct lightning current impact
  • New item   Surge protective device for PV (DC) Type 1+2 (B+C) | 3P | Ucpv 1200 V DC | Iimp 8 kA | Imax 50 kA | IP20 | SCHELINGER A53-SPD-MOV-DC-3P-T1T2

    Surge protective device for PV (DC) Type 1+2 (B+C) | 3P | Ucpv 1200 V DC | Iimp 8 kA | Imax 50 kA | IP20 | SCHELINGER A53-SPD-MOV-DC-3P-T1T2

    Code: A53-SPD-MOV-DC-3P-T1T2
    Barcode: 5900280950598
    Inquire about this item
    Price 36.17 € VAT incl.
    ( 29.90 € VAT excl. )

    SCHELINGER A53-SPD-MOV-DC-3P-T1T2 is a Type 1+2 (B+C) surge protective device for the DC side of a PV plant, for PV systems up to 1000 V DC. Iimp 8 kA (10/350 µs), Imax 50 kA. Installed in the DC combiner next to the inverter or at the strings.

  • Product description

    Surge protective device for PV (DC) Type 1+2 (B+C) | 3P | Ucpv 1200 V DC | Iimp 8 kA | Imax 50 kA | IP20 | SCHELINGER A53-SPD-MOV-DC-3P-T1T2

    SCHELINGER A53-SPD-MOV-DC-3P-T1T2 is a Type 1+2 (B+C) surge protective device for the DC side of a PV plant, for PV systems up to 1000 V DC. Iimp 8 kA (10/350 µs), Imax 50 kA. Installed in the DC combiner next to the inverter or at the strings.

    Key point:
    PV DC cables on the roof are often the closest to a lightning strike. The DC-side SPD protects the inverter inputs – the most expensive part of the system.
    Class
    Type 1+2 / Class I+II / B+C
    Iimp (10/350 µs)
    8 kA
    Up
    < 4.5 kV
    Configuration
    DC Y

    Operating principle

    The SPD is mounted in the DC combiner box next to the inverter (or next to the module strings) and connected between DC+, DC− and PE in a Y configuration.

    The varistors, which normally conduct no current, open during a surge and divert the partial lightning current (10/350 µs) or induced impulse to the equipotential bonding bar.

    The inverter's MPPT inputs see only a limited voltage, and worn modules disconnect and show their status on the indicator.

    What does SCHELINGER A53-SPD-MOV-DC-3P-T1T2 do for you?
    SCHELINGER A53-SPD-MOV-DC-3P-T1T2 protects the most expensive part of a solar PV plant – the inverter's DC inputs – when the building has a lightning protection system and the modules cannot be kept at a safe separation distance.

    Technical specifications

    Product type Surge protective device for PV (DC) Type 1+2
    Manufacturer / model SCHELINGER A53-SPD-MOV-DC-3P-T1T2 (EAN 5900280950598)
    Class (IEC / EN 61643-11) Type 1+2 / Class I+II / B+C
    Poles / configuration 3P (Y circuit) – two varistors from DC+ and DC− to a common point, the third from it to PE
    Max. continuous operating voltage Ucpv 1200 V DC (for PV systems up to 1000 V DC)
    Impulse current Iimp (10/350 µs) 8 kA
    Max. discharge current Imax (8/20 µs) 50 kA
    Voltage protection level Up < 4.5 kV
    Mounting DIN rail 35 mm
    Degree of protection IP20
    Operating temperature −40…+70 °C
    Dimensions (D × H × W) 81 × 90 × 54 mm

    Main functions

    • T1+T2 for the DC side – Iimp 8 kA (10/350 µs), Imax 50 kA (8/20 µs).
    • Y configuration – DC+ → PE and DC− → PE, for ungrounded PV systems.
    • Ucpv 1200 V DC – for PV systems up to 1000 V DC.
    • Plug-in modules and status indication.
    • DIN mounting – 3 modules, IP20 inside the enclosure.

    Wiring diagram – DC (Y configuration) – DC side of a solar PV plant

    DC (Y configuration) – DC side of a solar PV plant – SCHELINGER A53-SPD-MOV-DC-3P-T1T2 | elsprendimai.eu
    ☝ Click the diagram to open an enlarged version.
    ⚠ The diagram is for guidance only and may contain inaccuracies. Before wiring, check it against the manufacturer's instructions and the markings on the device.
    The qualified electrician carrying out the installation is responsible for it. UAB "Elektrotechnikos sprendimai" is not liable for the connection or any errors.

    Most common wiring mistakes

    ✗ Ucpv too low On a cold day the string Uoc rises by ~15–20 % – the SPD conducts continuously and overheats.
    ✗ Separate PE without bonding DC and AC SPDs on different bars – a voltage difference arises between them and the inverter gets damaged.
    ✗ Large loop between DC+ and DC− The loop acts as an antenna and picks up induced surges.
    ✗ T2 DC instead of T1+T2 With a lightning protection system and an insufficient separation distance, a T2 DC SPD is not designed for partial lightning current.

    How does it differ from similar models?

    • LSP FLP12.5-275/4S – 4P TN-S | Iimp 12.5 kA | Up ≤ 1.5 kV – AC T1+T2 SPD in the same switchboard – for the inverter's AC side.
    • SCHELINGER A51-SPD02-4P-B+C – 4P | Iimp 8 kA | Up ≤ 1.5 kV – AC T1+T2 SPD in the same switchboard – for the inverter's AC side.

    Where is it used?

    • DC combiner box at the inverter when the modules are more than 10 m away
    • Solar PV plant on a building with a lightning protection system
    • PV systems up to 1000 V DC on farm and production buildings
    • Ground-mounted plants with long DC lines
    • PV plant upgrades according to a lightning protection design
    • Inverter replacement after lightning damage

    Selection and installation

    • Type 1+2 on the DC side is needed when the building has an LPS and the separation distance to the modules is not kept. Otherwise Type 2 DC is usually enough.
    • Ucpv must not be lower than the maximum string Uoc on a cold winter day (about Uoc × 1.15–1.2).
    • Connected DC+ → PE and DC− → PE (Y circuit), keep the leads as short as possible.

    Use by need

    For the plant owner.
    Repairing an inverter after a lightning strike costs more than the SPD – the DC side is protected in advance.
    For the installer.
    Simple Y configuration and DIN mounting in the DC combiner box.
    For the designer.
    A T1+T2 DC solution when the separation distance to the lightning protection system cannot be maintained.

    Practical application

    If a 30 kW plant is installed on a farm building with a lightning protection system and the modules are closer to the air termination than the separation distance, install a T1+T2 DC SPD for each MPPT input in the DC combiner box at the inverter, and a T1+T2 AC SPD on the AC side, on the same equipotential bonding.

    Pros

    • T1+T2 protection for the DC side
    • Ucpv 1200 V DC – for PV systems up to 1000 V DC
    • Plug-in modules and indication
    • Compact – 3 DIN modules

    Cons / limitations

    • Up < 4.5 kV – an additional T2 DC stage may be needed close to the inverter
    • The manufacturer's datasheet is not publicly available – parameters are based on distributor data
    • A separate SPD is needed for each MPPT input

    ⚡ Safety and installation notes

    • The DC circuit is live in daylight even with the inverter disconnected – before work, open the DC isolator and cover the modules or work in the dark.
    • Ucpv must be no lower than the maximum string Uoc on a cold winter day.
    • PE goes to the same equipotential bonding bar as the AC SPD.
    • DC+ and DC− conductors run side by side, without large loops.
    • Work must be carried out by a qualified electrician familiar with PV systems.
    ☝ From experience
    • The inverter DC inputs have internal protection, but it is designed for low energy. If the separation distance between modules and the air termination is not kept, only an external Type 1+2 DC SPD protects the MPPT inputs; if it is kept, Type 2 DC is usually enough.
    • Run the PE from the DC SPD to the same equipotential bonding bar as the AC-side SPD – otherwise a voltage difference appears between them.
    • Route the DC+ and DC− conductors side by side – a large loop between them acts like an antenna and picks up induced overvoltage.
    ☝ Elsprendimai.eu recommends: On the AC side, in the same switchboard, it is worth installing a T1+T2 AC SPD, and for earthing – an equipotential bonding bar. If the separation distance is maintained, a T2 SPD is sufficient.

    Quick selection guide

    Type 1+2 / Class I+II / B+C
    8 kA
    < 4.5 kV
    DC Y

    Suitable when you need:

    • To protect the inverter's DC inputs when the building has a lightning protection system
    • PV systems up to 1000 V DC
    • A T1+T2 solution for the DC combiner box

    Check before use:

    • The maximum string Uoc on a cold day
    • Whether the separation distance to the lightning protection system is maintained
    • The number of MPPT inputs – how many SPDs you will need

    Important reminder: A DC SPD does not replace AC-side protection or the lightning protection system – protection is planned for the whole system.

    FAQ

    Is T1+T2 needed if the building has no lightning protection system?
    T2 DC is usually sufficient; T1+T2 DC is needed when there is a lightning protection system and the separation distance is not maintained.
    How many SPDs are needed?
    Usually one per MPPT input, and for long lines – also at the modules.
    Is it suitable for a 1000 V DC system?
    Yes, Ucpv 1200 V DC; check that the string Uoc on a cold day does not exceed this value.
    Where to install – at the inverter or at the modules?
    First at the inverter; if the DC line is longer than 10 m – also at the modules.
    Can an AC SPD be used on the DC side?
    No, AC SPDs are not designed for direct voltage or for extinguishing a DC arc.
    What should I do when the indicator is red?
    Open the DC isolator and replace the module with an insert from the same series.
    Not sure which one to choose? See the Type 1+2 SPD selection guide or contact us – we will select it from your board diagram.

    Documents and sources

    Surge protective device for PV (DC) Type 1+2 (B+C) | 3P | Ucpv 1200 V DC | Iimp 8 kA | Imax 50 kA | IP20 | SCHELINGER A53-SPD-MOV-DC-3P-T1T2

    SCHELINGER A53-SPD-MOV-DC-3P-T1T2 – T1+T2 surge protective device for the DC side of a solar PV plant: Ucpv 1200 V DC, Iimp 8 kA, Imax 50 kA. Protects the inverter's MPPT inputs in buildings with a lightning protection system.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

  • Alternative products

  • Subscribtion to new arrivals

    privacy policy

    Information