A 3-pole manual changeover switch with open-type Kit Kat fuses is an electrical switching device designed to manually transfer power supply from one source to another—commonly between main (public utility) and generator power.
Specifications
Electrical Ratings
• Poles: 3-pole (L1, L2, L3)
• Rated Voltage: 415V AC (3-phase)
• Rated Frequency: 50/60 Hz
• Rated Current Options: 32A, 63A, 100A, 200A, 250A, 400A (varies by model)
• Breaking Capacity: Based on installed Kit Kat fuse rating (typically 16kA to 20kA)
2. Construction
• Design: Open-type (fuse carriers and terminals exposed for inspection)
• Base Material: Porcelain or high-temperature phenolic resin (heat-resistant)
• Fuse Carrier Material: Ceramic/porcelain with copper or brass contacts
• Switch Mechanism: Heavy-duty mechanical lever for manual operation
• Enclosure: Usually supplied without enclosure (installer adds metal box if needed)
3. Fuse System (Kit Kat Fuse)
• Fuse Type: Rewirable or cartridge open-type
• Fuse Carrier: Porcelain with reinforced terminals
• Fuse Wire Rating: Based on load (commonly 30A, 60A, 100A, 200A, etc.)
• Protection: Overload and short-circuit protection
4. Terminals & Conductors
• Terminal Material: Copper or brass for efficient conductivity
• Conductor Compatibility: Aluminium and copper cables
• Cable Size Range: Matches current rating (e.g., 10–35 mm² for 63A; 35–95 mm² for 200A)
5. Switching Performance
• Operation Type: Manual changeover
• Position Settings:
• Main (I)
• Off (0)
• Generator (II)
• Simultaneous Switching: All poles switch together to prevent phase imbalance
• Mechanical Endurance: Typically >10,000 switching operations
6. Safety & Compliance
• Short-Circuit Protection: Provided through Kit Kat fuses
• Insulation: Heat-resistant porcelain parts
• Standards: Conforms to IEC 60947-3 for switch disconnectors
• Temperature Resistance: Suitable for high-heat electrical environments
7. Installation Features
• Mounting: Surface mounting on panel or flat board
• Cable Entry: Side or bottom depending on installation
• Easy Fuse Access: Open-type design enables fast fuse inspection and replacement
• Clearly marked terminals for incoming and outgoing supply
