Eaton PKZ-SOL20 DC String Protection Switch, 2-Pole, 16-20 A, 1000 V DC, DIN Rail 120938

The Eaton PKZ-SOL20 is a 2-pole DC string protection switch engineered for photovoltaic systems operating up to 1000 V DC. Its thermal-magnetic trip unit provides reliable overload and short-circuit protection with an adjustable overload setting from 16 A to 20 A and a fixed instantaneous short-circuit release at approximately 12 times the rated current.

Advantages

Designed for DIN rail mounting, this switch offers a short-circuit breaking capacity of 10 kA at 1000 V DC, ensuring safe interruption of fault currents in solar DC circuits. The adjustable overload release allows precise matching to the connected PV string current, while the compact 2-pole design saves space in combiner boxes and inverter enclosures.

Suitable for

• Photovoltaic string protection on the DC side
• DC circuit protection in solar combiner boxes
• Inverter DC input protection
• Industrial DC applications up to 1000 V

Key specifications

• Rated operational voltage: 1000 V DC
• Rated current range: 16 - 20 A (adjustable)
• Number of poles: 2
• Short-circuit breaking capacity: 10 kA at 1000 V DC
• Tripping characteristic: Thermal-magnetic
• Instantaneous short-circuit release: fixed, approx. 12 x In
• Mounting: DIN rail (35 mm)
• Terminal capacity: 1 x 1.5 - 16 mm² (solid/stranded) / 2 x 1.5 - 6 mm²
• Rated impulse withstand voltage: 6 kV
• Operating temperature range: -25 to +55 °C
• Electrical life: 10,000 operations
• Mechanical life: 100,000 operations

Recommendations

For PV installations requiring reliable DC string protection, the Eaton PKZ-SOL20 offers a robust solution with adjustable overload settings and high breaking capacity. Verify that the short-circuit current of your PV array does not exceed 10 kA and that the continuous current is within the 16-20 A range.