The SUNTREE SISO-40MD-B DC ISOLATING SWITCH 1000V 4P 32A is a Direct Current (DC) Isolating Switch specifically designed for use in high-voltage DC electrical systems. This device is used for disconnecting and isolating parts of a DC circuit for maintenance or in emergency situations, particularly in solar power systems. The switch has a voltage rating of up to 1000V DC, is a 4-pole (4P) configuration, and supports a maximum current of 32A, making it suitable for installation in medium-sized solar power systems and other high-voltage DC applications.