Products catalog

Home/Product Catalog/Solar Energy Generation and Management Equipment/Solar Power Plant Balancing | Automation Control | Analysis | Monitoring/Surge protectors for solar | photovoltaic systems
  • New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA
    New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA 1
    New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA 2
    New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA 3
    New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA 4
    New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA 5
    New item   Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA 6

    Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA

    Code: ES-TXSD-R240KA
    Inquire about this item
    Price 20.33 € VAT incl.
    ( 16.80 € VAT excl. )
    Want another price? Suggest yours!

    ES-TXSD-R240KA is a modular surge protective device (SPD), designed to protect solar power plants and other DC systems from unexpected voltage spikes caused by lightning or mains disturbances. The device protects circuits up to 1000 V DC and is mounted on a standard 35 mm DIN rail in a distribution box. Used in photovoltaic (PV) systems – between the solar modules and the inverter, or at each end of a DC line.

  • Product description

    Modular surge protective device for photovoltaic systems | 2P | 40 kA | 1000 V DC | DIN | ES-TXSD-R240KA

    ES-TXSD-R240KA is a modular surge protective device (SPD), designed to protect solar power plants and other DC systems from unexpected voltage spikes caused by lightning or mains disturbances. The device protects circuits up to 1000 V DC and is mounted on a standard 35 mm DIN rail in a distribution box. Used in photovoltaic (PV) systems – between the solar modules and the inverter, or at each end of a DC line.

    Main point:
    A photovoltaic system is one of the parts of an electrical installation most exposed to lightning and surges – long outdoor cables from the modules to the inverter act like an antenna for a nearby lightning strike, and even an indirect strike can induce a pulse of several thousand volts in the DC circuit. Such a pulse can burn out the inverter input within milliseconds, and repairing or replacing it costs far more than the surge protective device itself. ES-TXSD-R240KA reacts in under 25 ns and diverts up to 40 kA of discharge current to the earthing system, so the inverter and modules stay protected before the voltage reaches a dangerous level.
    Max. discharge current (Imax)
    40 kA
    Rated operating voltage
    DC up to 1000 V
    Number of poles
    2P
    Mounting
    35 mm DIN rail

    Operating principle

    The SPD is mounted in a distribution box between the solar module row and the inverter, or ahead of the inverter itself, connected in parallel to the DC line and the earthing system. Under normal operating conditions the device's internal elements have high resistance and have no effect on the circuit. When voltage exceeds the permitted limit due to a lightning discharge or mains disturbance, the SPD's resistance drops sharply and it diverts the discharge current to the earth conductor in under 25 ns, protecting the equipment beyond it.

    The device suppresses both common-mode (line-to-earth) and differential-mode (line-to-line) surges, which matters in PV systems, where a lightning-induced pulse can occur both between a DC pole and the housing and between the two DC conductors. The rated discharge current In = 20 kA indicates the value the SPD withstands repeatedly without losing its properties, while Imax = 40 kA is the single maximum pulse limit. The voltage protection level Up ≤ 3.2 kV shows to what residual voltage the pulse is reduced downstream of the SPD, which determines the stress on the protected inverter.

    What makes ES-TXSD-R240KA useful?
    The double-pole (2P) construction protects both DC conductors with one module, and DIN mounting allows installation in a standard distribution box without an additional enclosure. An indicator shows the device's status in real time, so during a routine inspection it is immediately visible whether the SPD is still fit for use or needs replacing.

    Technical specifications

    Model ES-TXSD-R240KA
    Product type Modular surge protective device (SPD) for photovoltaic systems
    Rated operating voltage DC up to 1000 V
    Number of poles 2P (double-pole)
    Voltage protection level (Up) ≤ 3.2 kV
    Max. discharge current (Imax) 40 kA
    Rated discharge current (In) 20 kA
    Response time < 25 ns
    Mounting 35 mm DIN rail
    Degree of protection IP20
    Housing material PA66 non-flammable, heat-resistant plastic
    Protection mode Common-mode and differential-mode surge suppression
    Certificates CE

    Key features

    • Lightning strike suppression – protects inverters, solar modules and other DC circuit equipment from the effects of lightning.
    • Comprehensive surge protection – effectively suppresses unexpected voltage spikes in both common-mode and differential-mode circuits.
    • Fast response – trips in under 25 ns.
    • Status indication – allows real-time monitoring of whether the SPD is still functional.
    • Resistant housing – PA66 non-flammable, heat-resistant plastic.
    • Easy installation – standard mounting on a 35 mm DIN rail, fits all distribution boxes.

    Where is it used?

    • Solar photovoltaic power plants (PV systems)
    • Protection of solar module row and inverter DC inputs
    • Industrial and commercial DC networks
    • Long outdoor DC lines from module to inverter
    • Residential solar power plants up to 1000 V DC
    • DC distribution boxes on rooftop or ground mounting structures
    • Both ends of the DC line – at the modules and at the inverter, when the line is long and runs outdoors

    Use by need

    For home users.
    In a home rooftop solar power plant, long DC cables run outdoors from the modules to the inverter in a garage or technical room – this is a direct path for lightning impact. An SPD at the inverter input reduces the risk that a summer storm will damage the system's most expensive component.
    For businesses and industry.
    In industrial or commercial PV installations with many inverters, each DC input should have its own protection – repairing one inverter is usually cheaper than downtime of the whole line. ES-TXSD-R240KA allows standardising protection across all panels with a single solution.
    For electricians / engineers.
    When designing, check three things: the system's DC voltage does not exceed 1000 V, the SPD is mounted as close as possible to the protected equipment with short connecting leads, and a suitable earthing circuit exists to carry away the discharge current – without a good earthing system the SPD's effectiveness is reduced.

    Practical application

    If a rooftop solar power plant consists of two rows of 20 modules connected to the inverter via a 30 m outdoor cable, an ES-TXSD-R240KA is installed in the DC distribution box at the inverter input. If lightning strikes nearby, the induced voltage in the DC line can reach several thousand volts within milliseconds – the SPD diverts up to 40 kA of current to earth in <25 ns and reduces the residual voltage to ≤3.2 kV, so the inverter's DC input does not burn out.

    Pros

    • Protection from lightning and surges up to 40 kA – Imax is sufficient for most PV systems.
    • Fast response <25 ns – the pulse is diverted before it reaches the inverter.
    • Simple, quick installation – standard DIN rail.
    • Status indication – continuous operation monitoring without extra equipment.
    • Compatible with any PV system up to 1000 V DC. –
    • Fire-resistant PA66 housing – additional safety in the distribution box.

    Cons / limitations

    • Only IP20 protection – not intended for mounting in damp or open locations without an additional enclosure.
    • Installation requires electrical expertise – proper connection and earthing.
    • Does not protect against prolonged low- or high-voltage conditions – designed only for impulse surges.
    • After a major trip, the device may need to be checked or replaced – this is shown by the indicator.
    • Dimensions and weight are not stated in the source, so the panel space requirement must be confirmed separately.

    Safety and installation notes

    • Install as close as possible to the protected equipment, keeping connecting leads as short as possible.
    • Before installation, disconnect the system from voltage and make sure the DC line is not live.
    • Ensure a quality earthing circuit – without it the SPD's effectiveness decreases.
    • Mount on a 35 mm DIN rail inside an enclosed distribution box – IP20 is not intended for outdoor conditions without an enclosure.
    • Periodically check the status indicator, especially after storms or lightning.
    • Follow the manufacturer's specified connection polarity and sequence.

    Quick selection guide

    Max. discharge current (Imax)
    40 kA
    Rated operating voltage
    DC up to 1000 V
    Number of poles
    2P
    Mounting
    35 mm DIN rail
    Suitable when you need to:
    • protect a PV system's DC circuit up to 1000 V from lightning-induced surges;
    • a fast, automatic DIN-rail SPD solution with status indication;
    • double-pole protection for both DC conductors with a single module.
    Check before use:
    • whether the system's DC voltage does not exceed 1000 V;
    • whether there is a suitable earthing circuit to carry away discharge current;
    • whether the mounting location is enclosed (IP20);
    • whether there is free space on a DIN rail in the distribution box.
    Important reminder:
    The SPD protects against short-term impulse surges but does not replace a proper earthing system and does not protect against continuous overvoltage – these are separate design tasks.

    FAQ

    Where should the SPD be mounted in a PV system?
    At the inverter's DC input, or at both ends of the line when the cable is long and runs outdoors.
    What maximum DC voltage does it withstand?
    Up to 1000 V DC.
    How quickly does it react to a surge?
    Under 25 nanoseconds.
    Is it suitable for outdoor mounting without an enclosure?
    No – the degree of protection is only IP20, an enclosed distribution box is required.
    How do you know whether the SPD is still working?
    The device has an indicator showing its status in real time.
    Does it protect against a continuous voltage rise?
    No – it is designed for short-term impulse surges, not long-term conditions.

    Modular surge protective device for photovoltaic systems | 2P

    ES-TXSD-R240KA is a modular double-pole surge protective device for photovoltaic and other DC systems up to 1000 V, mounted on a 35 mm DIN rail. It suppresses common-mode and differential-mode surges up to 40 kA (Imax), responds in under 25 ns, and has a status indicator, making it suitable for both residential and industrial solar power plants.

    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

    U-FTP Cable | 6A CAT | 4x2x23 AWG | shielded | copper | UV resistant | outdoor use | black U-FTP Cable | 6A CAT | 4x2x23 AWG | shielded | copper | UV resistant | outdoor use | black  
    U-FTP Cable | 6A CAT | 4x2x23 AWG | shielded | copper | UV resistant | outdoor use | black
    Code: KIF6AOUTS500
    Price 0.73 € VAT incl.
    ( 0.60 € VAT excl. )
    Add to cart 
    Cable for solar modules | 1x4mm² | black | H1Z2Z2K | Dca | SOLAR IEMMEQU HAR  
    Cable for solar modules | 1x4mm² | black | H1Z2Z2K | Dca | SOLAR IEMMEQU HAR
    Code: H1Z2Z2K
    Price 0.98 € VAT incl.
    ( 0.81 € VAT excl. )
    Add to cart 
    Network plug | RJ45 connector (8P8C) | for UTP CAT 6e cable | unshielded | through-plug | transparent Network plug | RJ45 connector (8P8C) | for UTP CAT 6e cable | unshielded | through-plug | transparent  
    Network plug | RJ45 connector (8P8C) | for UTP CAT 6e cable | unshielded | through-plug | transparent
    Code: WT117
    Price 0.20 € VAT incl.
    ( 0.17 € VAT excl. )
    Add to cart 

  • Subscribtion to new arrivals

    privacy policy

    Information