PV combiner box CNC NV822553 DC 10-in 10-out IP66

PV combiner box CNC NV822553 is a DC junction enclosure for photovoltaic systems with 10 inputs and 10 outputs, rated IP66 for dust and water protection. The polycarbonate housing (528 x 458 x 358 mm) is UV resistant and V0 flame-retardant, and the unit integrates MC4 connectors, surge protection devices and lockable DC switches to centralize string connections and enhance safety and maintainability in outdoor solar installations.

Advantages

The CNC NV822553 provides consolidated string termination for 10-in/10-out PV arrays, built-in DC surge protection (1000 V, 40 kA per SPD) and four lockable 1000 V/50 A DC switches with patented arc extinguishing chambers. The enclosure meets IP66 and IEC60529 standards, offers flame retardancy (UL94 V0), and supports a wide operating temperature range (-20 °C to +60 °C). Compact dimensions and standardized cable gland sizes simplify installation and cable management.

Suitable for

• Medium to large rooftop and ground-mounted PV systems requiring 10 string inputs
• Outdoor installations needing IP66-rated DC junction enclosures
• Solar arrays where integrated SPD and lockable DC switching are required for safety and maintenance

Key specifications

• Model: CNC NV822553
• Inputs / Outputs: 10 in / 10 out
• Maximum system voltage: 1000 V DC
• DC switch: 1000 V, 50 A (4 pcs), lockable handle, patented arc extinguishing chamber — standards UL508i, IEC 60947-3 Pv2
• SPD: 1000 V, Imax 40 kA (10 pcs), In 20 kA, response time <25 ns — standards IEC 61643-31, EN 50539-11+A1
• Short-circuit current per input (Isc): configurable 15 A–30 A
• Max output current: 50 A
• Voltage protection level (Up): 3.6 kV
• Enclosure material: polycarbonate; protection class IP66; flame rating UL94 V0
• Dimensions: 528 x 458 x 358 mm
• Cable gland sizes: input PG09 (2.5–16 mm), output PG21 (2.5–16 mm)
• Operating temperature: -20 °C to +60 °C
• Standards: IEC60529 and listed electrical standards as above
• Warranty: 24 months

How to use

Mount the PV combiner box on a suitable outdoor surface following local electrical codes and ensure the enclosure is positioned to avoid water pooling. Terminate each PV string using the provided MC4-compatible connections and route cables through the specified PG09/PG21 glands. Connect the combined outputs as required to the inverter or downstream DC protection. Use the lockable DC switches for isolating strings during maintenance and verify correct SPD connections to ensure surge protection is active. Commissioning should include continuity, polarity and insulation resistance checks before energizing the array.

Usage recommendations

Inspect cable terminations and gland seals periodically and replace SPDs after they operate or if their rated capacity is exceeded. Ensure switches are locked out during service, and follow manufacturer installation instructions and applicable standards for DC systems.