Phoenix Contact SOL-SC-2ST-0-DC-2MPP PV Combiner Box 2x2 String 2404295

Solar installations with multiple PV strings often face a common challenge: safely combining and protecting DC circuits before they reach the inverter. The Phoenix Contact SOL-SC-2ST-0-DC-2MPP (2404295) is a pre-wired PV combiner box that consolidates two input strings into two independent MPPT outputs, eliminating the need for custom DC wiring in the field. Its integrated surge protection and DC disconnect switch provide a compact, code-compliant solution for residential and small commercial PV systems.

Who is it for

This combiner box is ideal for solar installers and system integrators working on rooftop or ground-mounted PV arrays with up to two strings per MPPT. It suits projects where space is limited, but safety and reliability are non-negotiable. Whether you are commissioning a new installation or retrofitting an existing one, this unit simplifies DC-side wiring and enhances protection.

Main features

• Combines 2 PV input strings into 2 MPPT outputs (1 string per MPPT)
• Integrated Type II surge protection device (SPD) for overvoltage protection
• Built-in 2-pole DC disconnect switch for safe isolation during maintenance
• MC4-compatible PV input connectors for quick, tool-free connections
• IP65-rated polycarbonate enclosure for outdoor use
• No string fuses required, reducing maintenance and potential failure points
• Wall-mounting design with cable glands for output wiring

Specifications

• Product Type: PV Combiner Box
• Number of PV Strings (Input): 2
• Number of MPPTs (Output): 2
• Max. Input Voltage (Uoc max): 1000 V DC
• Max. Input Current per String (Isc max): 15 A
• Max. Total Input Current (Imax): 30 A
• Overvoltage Protection: Type II SPD
• DC Disconnector: Integrated 2-pole DC switch
• Fuse Protection: No string fuses
• Enclosure Material: Polycarbonate (PC)
• Protection Rating: IP65
• Ambient Temperature Range (Operation): -25 °C to 60 °C
• PV Input Connectors: MC4-compatible
• PV Output Connection: Cable glands (M20)
• Mounting Type: Wall mounting
• Standards: IEC 61439-2, IEC 62446-1

Tips

For optimal performance, mount the combiner box close to the PV array to minimize DC cable runs. Ensure the DC disconnect switch is in the OFF position before connecting or disconnecting strings. Periodically inspect the enclosure for damage and verify that cable glands remain tight to maintain the IP65 rating. If your system expands beyond two strings, consider using multiple combiner boxes or a larger model.