--- path: "/" locale: en-gb alternates: x-default: "/en-gb/information-resources/blog/guarding-devices-against-voltage-spikes" en-gb: "/en-gb/information-resources/blog/guarding-devices-against-voltage-spikes" nl-nl: "/nl-nl/informatie-resources/blog/Bescherm-apparaten-tegen-spanningspieken" title: "Citel Surge Protection Solutions for PV & AC Networks" description: "Protect solar inverters, battery storage, and AC distribution systems against grid voltage spikes and lightning surges with Citel Type 1+2 and Type 2 SPD solutions." type: information-resource --- # ESTG ![An electrician installing Citel DIN-rail surge protective devices (SPD) inside an AC distribution panel and DC combiner box to protect PV inverters and battery storage against grid voltage spikes.](https://a.storyblok.com/f/288569/2000x2000/437f028c9d/citel-spd-surge-protection-pv-installation-estg.jpg) Grid voltage fluctuations and high-energy transients pose a constant operational risk to modern electrical infrastructure. On days with peak solar generation or sudden grid switching, low-voltage networks frequently experience voltage spikes. Without dedicated overvoltage protection, these transients can degrade sensitive power electronics, disrupt operation, and cause catastrophic failure in PV **[inverters](/assortment/solar/inverters/)**, **[battery storage systems](/assortment/storage/batteries/)**, and **[EV charging hubs](/assortment/e-mobility/)**. Integrating surge protective devices (SPD) into both AC distribution panels and DC solar arrays safely diverts excess transient voltage to the ground, securing the entire system architecture. ## Why is surge protection critical for modern PV and energy systems? Surge protective devices (SPDs) protect electrical infrastructure by detecting transient overvoltages from grid spikes or lightning strikes and safely diverting the surge current to the earth within nanoseconds. Installing Type 1+2 or Type 2 SPDs at main AC distribution boards and DC PV combiner boxes prevents equipment damage, extends component lifespan, and ensures compliance with international safety standards like IEC 61643. ## Comprehensive protection with Citel SPD solutions To safeguard both AC building circuits and high-voltage DC solar arrays, ESTG supplies a targeted **[lineup of Citel](/brands/citel/)** surge protective devices: - **Citel DC surge protection for PV arrays (DS50VGPV & DS50PV series):** Engineered specifically for photovoltaic installations, these DIN-rail Type 2 and Type 1+2 DC SPDs protect PV inverters against direct and indirect lightning surges up to 1500 V DC. - **Citel AC surge protection for distribution panels (DS40 & DS240 series):** Compact Type 2 AC surge protectors designed for single-phase and three-phase low-voltage power supply networks, shielding sensitive control electronics and HEMS units from grid transients. - **Citel dataline & communication protection (DLA & DLD series):** Protects RS485, Ethernet, and data communication interfaces on smart meters and monitoring portals against signal-line surge coupling. ## Core commercial and technical advantages of Citel surge protection Integrating high-performance Citel surge protection provides distinct operational benefits across residential and commercial projects: - **Extensive equipment coverage:** Protects high-value power assets, including hybrid inverters, battery management systems, and EV chargers, against irreversible transient damage. - **Pluggable module architecture:** Citel SPDs feature replaceable plug-in modules, enabling rapid maintenance and module replacement without disconnecting the main wiring. - **Visual status indication & remote signaling:** Integrated mechanical indicators and remote contact outputs provide real-time status updates on protection availability. - **Standards compliance:** Fully compliant with IEC 61643-11 (AC) and IEC 61643-31 (PV DC) standards, meeting strict European building and insurance safety requirements. ## Order Citel surge protection directly at ESTG ESTG stocks a **[complete range of Citel](/brands/citel/)** Type 1+2 and Type 2 surge protection devices for AC, DC, and dataline applications, for European distribution. Explore the complete Citel product portfolio, technical datasheets, and B2B volume pricing directly in **your personal account**. Questions? Please **[contact us directly](/about-estg/contact)**. ## Frequently asked questions (FAQ) - **What is the difference between Type 1 and Type 2 surge protective devices?**Type 1 SPDs are designed to discharge direct lightning currents (10/350 µs waveform) and are typically installed at the main service entrance. Type 2 SPDs protect against indirect lightning surges and switching transients (8/20 µs waveform) and are installed at sub-distribution boards or directly upstream of PV inverters. - **Are Citel DC surge protectors required on both sides of a PV inverter?**Yes, comprehensive system protection requires installing DC surge protection between the solar array and the inverter inputs, as well as AC surge protection on the AC output side leading to the main distribution panel. - **How do you know when a Citel surge protection module needs replacement?**Citel SPDs feature a clear visual status indicator on the front panel (green for operational, red for disconnected/faulty). Additionally, models equipped with remote contact signaling can send alarm notifications to monitoring systems when a module needs replacing.