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The LW28-20A/2P is an industrial universal rotary cam changeover switch used in power distribution, control panels, generator transfer switching, and motor control circuits. It features flame-retardant PC housing, silver-alloy contacts for high electrical endurance, and a 2-pole configuration designed for manual switching between two circuits or power sources.
Versatile Switching: Commonly configured as a 3-position switch (1 – 0 – 2 or ON – OFF – ON) for changeover or a 2-position switch (0 – 1 or OFF – ON).
High Electrical Reliability: Uses silver-alloy contacts to prevent arc flash oxidation and maintain low contact resistance under load.
Compact Panel Mounting: Fits standard panel cutout dimensions for installation inside electrical control cabinets, bridge consoles, and power distribution boxes.
Common Uses: Manual dual-power transfer (e.g., Shore Power to Generator), AC motor forward/reverse control, ammeter/voltmeter selector switching, and circuit isolation.
| Category | Parameter | Technical Details |
| Model & Series | Model Code | LW28-20A/2P (Equivalent to HZ5 / CA10 series) |
| Poles & Positions | Pole Count | 2 Poles (2P) |
| Positions / Positions State | 3-Position (1 – 0 – 2) or 2-Position (0 – 1 / OFF – ON) | |
| Mechanical Action | Latching / Maintained position | |
| Electrical Ratings | Rated Insulation Voltage (Ui) | 690V AC |
| Rated Thermal Current (Ith) | 20A | |
| Rated Operational Voltage (Ue) | 220V / 380V / 440V AC | |
| Rated Operational Current (Ie) | AC-15: 2.5A (380V) | AC-3: 5.5kW (380V) | AC-23A: 7.5kW (380V) | |
| Endurance & Performance | Mechanical Life | 300,000 Operations |
| Electrical Life | 100,000 Operations | |
| Operating Frequency | 120 operations per hour | |
| Physical & Environmental | Contact Material | Silver Alloy (AgSnO2 / AgCdO) |
| Body Material | High-temp Flame Retardant PC / ABS Plastic | |
| Terminal Type | Screw Clamp Connection | |
| Ingress Protection | IP40 (Front Knob Panel) / IP65 with protective enclosure box | |
| Operating Temperature | -25°C to +55°C | |
| Standards & Compliance | Applicable Standards | IEC 60947-3, GB/T 14048.3, CE Certified |
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