Eaton Photovoltaic DC String Box 1x IN+1x OUT SPD Type 2 MC4 (EP-501987)

For solar installers and PV system integrators, the Eaton EP-501987 DC string box consolidates one input string and one output string in a compact, wall-mounted enclosure. It combines a 2-pole DC disconnector and a Type 2 surge protective device with MC4 connectors, simplifying DC-side protection and isolation in rooftop and small commercial photovoltaic arrays.

Key specifications

• Number of input strings: 1
• Number of output strings: 1
• Nominal DC voltage: 1000 V DC
• Max. rated current: 32 A
• Surge protective device type: Type 2
• SPD max. continuous operating voltage: 1060 V DC
• SPD nominal discharge current: 20 kA
• SPD max. discharge current: 40 kA
• DC disconnector: included, 2-pole
• Connector type: MC4
• Enclosure protection rating: IP65
• Enclosure material: UV-resistant polycarbonate
• Operating temperature range: -25°C to +50°C
• Mounting type: wall mounting

Why choose it

This string box integrates surge protection and DC isolation in one IP65-rated enclosure, reducing wiring complexity and installation time. The UV-resistant polycarbonate housing withstands outdoor exposure, while MC4 connectors ensure reliable, tool-free connections.

Ideal use cases

• Rooftop PV systems with a single string
• Small commercial solar arrays
• Retrofit projects requiring DC-side protection

Good to know

The EP-501987 is designed for wall mounting and operates reliably in ambient temperatures from -25°C to +50°C. It is suitable for outdoor installation thanks to its IP65 protection.