Surge protection for photovoltaic systems In the midst of the energy transition, decentralized photovoltaic systems are becoming increasingly important. Whether large ground-mounted systems or smaller rooftop installations, surge protection measures are necessary in order to reliably and permanently protect photovoltaic systems and ensure system availability. Due to their conductor loops and installation locations, these systems are at risk from surge voltages caused by lightning strikes. Our string combiner boxes and surge protective devices not only ensure a long service life for your photovoltaic system, but also keep the payback time as short as possible. 2 Phoenix Contact

Directives and standards for lightning and surge protection for photovoltaic rooftop systems If signal and communication circuits are present in the photovoltaic system in question, these should also be equipped with surge protective devices. ❯ For the appropriate products for MCR and data lines, see page 23. When planning and installing new photovoltaic systems in Germany, it is important to comply with certain requirements. This applies not only to the systems themselves, but also to the surge protection of the corresponding system parts. DIN VDE 0100-712 describes how to plan and install photovoltaic systems in Germany. In order to optimally protect the systems against the effects of surge voltages, it is also important to ensure that the correct type of surge protection is used. On the alternating current side (AC side), surge protection is required in accordance with DIN VDE 0100-443. If the protection of the inverter is to be ensured, protection is also required on the direct current side (DC side) in accordance with DIN EN 62305-3 Supplement 5. AC side: Protective measures in the main distribution DIN VDE 0100-443 and DIN VDE 0100-534 specify whether and, if necessary, which surge protection measures must be provided on the AC side of the photovoltaic power supply system. DC side: Protection of the photovoltaic power supply system If it proves necessary to protect the inverter, DIN EN 62305-3 Supplement 5 stipulates that surge protective devices must primarily be installed in the proximity of the PV panels (DC 1). Additional protective measures may be necessary in the proximity of the inverter in the case of long cable lengths (> 10 m, DC 2). Protection of the inverter Do you have further questions about the normative principles or are you about to embark on a project and need advice? Then contact our experts for surge protection quickly and easily via WhatsApp. • Use the number +49 5235 343654 • Scan the QR code 4 Phoenix Contact

Find the right surge protection type Which type of surge protection is appropriate depends on the conditions at your planned photovoltaic system. There are three scenarios that each require different types of surge protection. 1. Photovoltaic rooftop system without external lightning protection DC 1 AC 1 AC 2 DC 2 DC 1 DC surge protection in the proximity of the PV panels DC 2 DC surge protection in the proximity of the inverter AC 2 AC surge protection on the AC side of the inverter Hauptverteilung Main distribution PV-Wechselrichter PV inverter PV generator field PV-Generatorfeld Netz Grid SPD AC 1 SPD AC 2 SPD DC 2 SPD DC 1 Haupterdungs- Main grounding klemme terminal block Type 2 Define the installation location of the SPD1) so that the device is installed as close as possible to the PV generator field, often directly after the entrance to the physical structure. Type 2 Surge protection is not required here if the cable length between “DC 1” and the inverter to be protected is less than 10 m. Type 2 A surge protective device is not required here if the cable length between “AC 1” and “AC 2” is less than 10 m. AC 1 AC surge protection in the main distribution Type 2 6 Phoenix Contact

Find the right string combiner box To determine the right string combiner box for your application, there are two options available in our online selection guide. If the inverter type is known, a preselection is already displayed after answering just three questions, which you can further refine using filters. If the inverter type is not known, simply use the filters directly to find the optimum solution for your application. You can access our online selection guide via the link or by scanning the QR code. ❯ phoenixcontact.com/ string-combiner-boxes Is the inverter type known? Yes No Which inverter will be used in your project? Huawei SMA Sungrow SolarEdge Fronius … Which inverter type will be used in your project? 1-phase (hybrid) 3-phase … Which inverter model will be used in your project? Model A Model B Model C Model D Model E … Preselection 8 Phoenix Contact

Standard string combiner boxes String combiner boxes need to be used in order to provide optimum protection for photovoltaic systems against surge voltages caused by lightning strikes, for example. Our ready-to-install string combiner boxes can be connected immediately, and are reliable system solutions that protect the inverter directly upstream of the DC and AC voltage inputs. All string combiner boxes with SUNCLIX connection technology come with the necessary field connectors included as standard. 10 Phoenix Contact

String combiner boxes with SUNCLIX connectors With SUNCLIX connectors MPP tracker Strings per MPP tracker Outputs per MPP tracker Current per string Arrester Size Designation 1 1 2 3 3 4 1 1 2 2 3 1 1 2 1 2 1 2 2 1 2 3 4 6 10 12 1 1 1 1 3 1 1 1 1 2 1 1 1 1 1 1 1 1 1 40 A 40 A 20 A 13 A 13 A 10 A 40 A 40 A 20 A 20 A 13 A 40 A 40 A 20 A 40 A 20 A 40 A 20 A 20 A With SUNCLIX connectors and switch disconnectors 1 2 2 1 2 1 1 1 With SUNCLIX connectors and fuses 1 2 4 3 1 1 16 A 32 A 16 A 10 A 13 A T1 / T2 T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 T1 / T2 1 1 2 2 2 2 2 2 3 3 3 3 3 4 4 4 4 7 7 2 4 4 3 4 SOL-SC-1ST-0-DC-1MPPT-1001 SOL-SC-1ST-0-DC-1MPPT-2001 SOL-SC-2ST-0-DC-1MPPT-1001 SOL-SC-3ST-0-DC-1MPPT-1001 SOL-SC-3ST-0-DC-1MPPT-1001EQ SOL-SC-4ST-0-DC-1MPPT-1001 SOL-SC-1ST-0-DC-2MPPT-1001 SOL-SC-1ST-0-DC-2MPPT-2001 SOL-SC-2ST-0-DC-2MPPT-1001SE SOL-SC-2ST-0-DC-2MPPT-1001EQ SOL-SC-3ST-0-DC-2MPPT-1001SE SOL-SC-1ST-0-DC-3MPPT-1001 SOL-SC-1ST-0-DC-3MPPT-2001 SOL-SC-2ST-0-DC-3MPPT-1001SE SOL-SC-1ST-0-DC-4MPPT-1001SE SOL-SC-2ST-0-DC-4MPPT-1001SE SOL-SC-1ST-0-DC-6MPPT-1001SE SOL-SC-2ST-0-DC-10MPPT-1001SE SOL-SC-2ST-0-DC-12MPPT-1001SE SOL-SC-2ST-0-DC-1MPPT-1101 SOL-SC-1ST-0-DC-2MPPT-1101 SOL-SC-2ST-0-DC-2MPPT-1101 SOL-SC-4ST-0-DC-1MPPT-1011 SOL-SC-3ST-0-DC-2MPPT-1011SE Item no. 2404298 2403338 1056073 2404765 1064363 2404296 2404299 2403337 1016813 1117754 1153124 2404301 2403336 1478915 1029990 1103205 1022360 1253218 1251937 2404297 1056071 2404569 2403335 1042281 Housing size 1 130 x 180 x 111 mm (W x H x D) Housing size 2 180 x 180 x 111 mm (W x H x D) Housing size 3 254 x 180 x 111 mm (W x H x D) Housing size 4 361 x 254 x 111 mm (W x H x D) 12 Phoenix Contact

Product list for special applications String combiner boxes with SUNCLIX connectors and switch disconnectors String entry on the top of the housing. DC output on the bottom of the housing MPP tracker Strings per MPP tracker Outputs per MPP tracker Current per string Arrester Size Designation 2 3 2 2 1 1 16 A 16 A T1 / T2 T1 / T2 String combiner boxes with cable gland and Push-in connection Versions with extended connection cross-section range in the DC output (max. 16 mm²) 1 2 3 2 2 2 1 1 1 20 A 20 A 20 A T2 T2 T2 Adapted to SolarEdge inverters with extended connection cross-section (max. 16 mm²) and increased maximum current of 75 A. 1 3 3 25 A T1 / T2 4 4 3 3 4 3 Version with extended connection cross-section (input strings max. 16 mm², DC output max. 35 mm²) and increased maximum current of 75 A. Connection of copper or aluminum conductors in the DC output. SOL-SC-2ST-0-DC-2MPPT-1101UD SOL-SC-2ST-0-DC-3MPPT-1101UD Item no. 1140111 1140960 SOL-SC-2ST-0-DC-1MPPT-2005 SOL-SC-2ST-0-DC-2MPPT-2005SE SOL-SC-2ST-0-DC-3MPPT-2005SE 1197141 1197145 1197147 SOL-SC-3ST-0-DC-1MPPT-1005EQ 1197151 1 3 1 25 A T1 / T2 4 SOL-SC-3ST-0-DC-1MPPT-1005AL 1216523 String combiner box with cable gland and Push-in connection and switch disconnectors Version with extended connection cross-section range in the DC output (max. 16 mm²) 1 2 1 16 A T2 3 SOL-SC-2ST-0-DC-1MPPT-2105 1428529 Housing size 3 254 x 180 x 111 mm (W x H x D) Housing size 4 361 x 254 x 111 mm (W x H x D) 14 Phoenix Contact

String combiner boxes with fire department switch disconnector Although no general regulation exists, fire protection organizations and insurers are increasingly recommending the use of fire department switch disconnectors. In the event of a fire, they allow the DC cables to be disconnected automatically directly at the PV panels. Switching off the mains voltage ensures that there is no voltage, which provides for safe firefighting without the need for additional measures. The motorization of the switch disconnector means that it is automatically restarted when the mains voltage is switched on. This is ideal for low-maintenance systems. 16 Phoenix Contact

String combiner boxes with fire department switch disconnector With SUNCLIX connectors and fire department switch disconnectors MPP tracker Strings per MPP tracker Outputs per MPP tracker Current per string Arrester Size Designation 1 2 2 2 1 1 20 A 20 A T1 / T2 T1 / T2 4 4 SOL-SC-2ST-0-DC-1MPPT-1301 SOL-SC-2ST-0-DC-2MPPT-1301SE With cable gland and Push-in connection and fire department switch disconnector MPP tracker Strings per MPP tracker Outputs per MPP tracker Current per string Arrester Size Designation 1 2 4 12 2 2 2 2 2 2 2 2 20 A 20 A 20 A 20 A T1 / T2 T1 / T2 T1 / T2 T1 / T2 4 4 6 7 SOL-SC-2ST-0-DC-1MPPT-1300EQ SOL-SC-2ST-0-DC-2MPPT-1300EQSE SOL-SC-2ST-0-DC-4MPPT-1300EQSE SOL-SC-2ST-0-DC-12MPPT-1300EQS Item no. 1809692 1809693 Item no. 1809684 1809690 1639245 1460946 Housing size 4 361 x 254 x 111 mm (W x H x D) Housing size 6 400 x 400 x 200 mm (W x H x D) Housing size 7 600 x 400 x 230 mm (W x H x D) 18 Phoenix Contact

Installation accessories Accessories for surge protection for the DC side S PV connector L PV connector Plug-in compatible Y distributor for collecting two strings Description Tool-free fast-connection technology Reduction of cable losses Greater flexibility in field cabling Cable connection Type Item no. Type Item no. 2.5 mm² ... 6 mm² PV-C3F-S 2,5-6 (+) 1386381 PV-C3M-S 2,5-6 (-) 1386384 6 mm² ... 16 mm² PV-C4F-S 6-16 (+) 1284634 PV-C4M-S 6-16 (-) 1284632 – PV-ED6/Y-120(2+/1-) 1030649 PV-ED6/Y-120(1+/2-) 1030650 Description Type Item no. Description Type Item no. Type Item no. PV protective cap IP67 protection for unused SUNCLIX connectors Self-sealing PV-C PROTECTION CAP 1785430 MC4 adapter MC4 to SUNCLIX Up to 35 A PV-AS-MC4/6-150MN-SET1 1079531 Replacement plug1) Replacement plug1) Replacement for faulty surge protection plugs Replacement for faulty surge protection plugs Type 2 or type 1/2 VAL-MS 1000DC-PV-ST 2800624 VAL-MS-T1/T2 1000DC-PV-ST 2801162 Type 2 or type 1/2 VAL-SPP-T2-1000DC-PV-P 1466779 VAL-SPP-T1-1000DC-PV-P 1466781 1) To find the appropriate replacement plug, go to the product page at: phoenixcontact.com 20 Phoenix Contact

Additional surge protection Surge protection for the AC side (suitable for 3-phase TN-S or TT systems) AC 1 ℹ Web code: #0291 Type of building With lightning protection, with / without overhead line Without lightning protection, with overhead line Without lightning protection, without overhead line Combined lightning current and surge arrester for the feed point of the low-voltage electrical installation. Installation downstream of the service panel (FLT-MB-T1) or in the grid-side wiring space of the meter panel (FLT-SEC-ZP2). In the case of overhead lines, the additional installation of an FLT-MB-T1 at the roof pole connection is recommended. Combined lightning current and surge arrester for the feed point of the low-voltage electrical installation. Installation in the grid-side wiring space of the meter panel (FLT-SEC-ZP2). The additional installation of an FLT-MB-T1 on the roof pole connection is recommended. Surge protection for the feed point of the low-voltage electrical installation. Installation in the system-side wiring space of the meter panel (VAL) or in the grid-side wiring space (FLT-SEC-ZP2). FLT-MB-T1-264/ 12.5-3+1-UT-R 1) 2) FLT-SEC-ZP2-3S- 255/12.5 2) 3) FLT-MB-T1-264/ 12.5-3+1-UT-R 1) FLT-SEC-ZP2-3S- 255/7.5 3) VAL-SEC-T2-3S- 350/40-FM 1) FLT-SEC-ZP2-3S- 255/7.5 3) 1380667 1168943 1380667 1168940 2909635 1168940 Description Type Item no. Surge protection for the AC side (suitable for 1- and 3-phase TN-S or TT systems) AC 2 ℹ Web code: #0291 Type of building With lightning protection, separation distance “s” maintained, or without lightning protection With lightning protection, separation distance “s” not maintained Description Additional surge protection in the immediate proximity of the inverter. Required if the distance to the surge protective device (SPD) at the feed point of the system is more than 10 m. the immediate proximity of the inverter. Always required if the separation distance has not been maintained, regardless of the distance to the surge protective device (SPD) at the feed point Additional combined lightning current and surge arrester in of the system. Inverter type 1-phase 3-phase Type Item no. VAL-SPP-T2-275-1+1-UT-R 1) VAL-SPP-T2-275-3+1-UT-R 1) 1466212 1466214 1-phase FLT-MB-T1-264/ 12.5-1+1-UT-R 1) 2) 1380657 3-phase FLT-MB-T1-264/ 12.5-3+1-UT-R 1) 2) 1380667 1) With remote indication contact. Also available without remote indication contact. 2) Can only be used for lightning protection level III/IV. FLT-MB-T1 is also available for lightning protection level I/II. 3) The remote signaling module shown is not supplied as standard and is available as an option under item no. 1168947. 22 Phoenix Contact

Contact our experts Via email We will be happy to assist you in selecting the right string combiner box for your photovoltaic system: ❯ Email: pm-combinations@phoenixcontact.com Find your local distributor ❯ phoenixcontact.com/ find-a-distributor Via WhatsApp Contact our experts with any questions regarding surge protection: Phoenix Contact ist ein weltweit agierender Marktführer mit Unternehmenszentrale in Deutschland. Die Unternehmensgruppe steht für zukunftsweisende Produkte und Lösungen für die umfassende Elektrifizierung, Vernetzung und Automatisierung aller Sektoren von Wirtschaft und Infrastruktur. Ein globales Netzwerk garantiert die wichtige Nähe zum Kunden. Watch our videos for help and instructions on our string combiner boxes. Our tutorials on YouTube ❯ Use the number +49 5235 343654 ❯ phoenixcontact.com/videos-scb ❯ Scan the QR code Ihren lokalen Partner finden Sie auf phoenixcontact.com PHOENIX CONTACT Deutschland GmbH Flachsmarktstraße 8 32825 Blomberg, Germany Phone: +49 5235 3-12000 Fax: +49 5235 3-12999 Email: info@phoenixcontact.com phoenixcontact.com 3 0 / 4 2 - 1 1 - 5 2 0 2 / 0 9 7 6 8 1 1 R N M 7 8 9 8 0 9 2 1 0 3