ZHUCO SZW26-125/D202.2 1-0-2 Three-position two-section changeover switch

The SZW26-125/D202.2 is a three-position (1-0-2), two-pole rotary changeover switch with a rated current of up to 125A, designed for reliable manual switching and safe isolation between two high-current loads or power sources. Its robust construction and high contact capacity make it a core manual component for controlling extra-high power circuits.
Key Parameters and Features:
Electrical Specifications: Rated operating voltage AC 440V (50/60Hz) / DC 240V, rated current 125A.
Contact Configuration: Uses two independent double-throw circuits, with a total of 8 terminals.
Position 1: First circuit connected (contacts 1-2 and 5-6).
Position 0 (OFF): All contacts are completely disconnected, providing a clear electrical isolation point.
Position 2: Second circuit connected (contacts 3-4 and 7-8).
Structure and Materials:
Contacts: Made of high-capacity silver alloy material, ensuring extremely low contact resistance, excellent conductivity, and resistance to welding at 125A current.
Conductors: Thickened copper components to meet the long-term current carrying and heat dissipation requirements of extra-high currents.
Housing: Flame-retardant, high-temperature resistant, environmentally friendly engineering plastic, providing reliable insulation performance and high mechanical strength.
Environmental Adaptability: Operating temperature range -25°C to +40°C, altitude ≤ 2000m. Meets the humidity requirements of typical industrial environments.
Lifespan: Mechanical life ≥ 300,000 cycles; Electrical life ≥ 60,000 cycles (at rated 125A load, operating frequency ≤ 120 times/hour).
Application Scenarios:
This switch is specifically designed for critical industrial applications requiring manual selection, switching, or safe isolation of extra-high current (125A level) circuits.
Main/Backup Power Switching: Used as a manual changeover switch for two ultra-high capacity power sources (such as mains power and generator, or two independent incoming lines), providing power supply assurance for critical heavy loads. High-power load switching: Controls the "one-in-use, one-in-standby" operating mode selection for two ultra-high-power devices (such as large motors, electric heating systems, and electrolytic power supplies).
Safe maintenance isolation:  Utilizes its intermediate "0" position to provide a safe and reliable electrical isolation point during maintenance of power distribution systems or heavy equipment, making it ideal hardware for implementing lockout/tagout (LOTO) procedures.