Rotary Cam Switch - 3-Pole Changeover EMAS
The EMAS 3-pole 40A changeover switch enables safe, direct manual transfer between two independent 3-phase power supply lines, backup generators, or separate load circuits (Source 1 – OFF – Source 2). Featuring double-break silver-alloy contacts, a center OFF isolation position, and a smooth 60^\circ rotary handle, it prevents supply short circuits while providing reliable isolation and long service life in industrial distribution panels.
Specification | Parameter Value |
|---|---|
Brand / Manufacturer | EMAS |
Series / Product Code | PSA Series (e.g., PSA040KD334S) |
Switch Function | Changeover (1 - 0 - 2 with Center OFF) |
Number of Poles / Phases | 3 Poles (3-Phase / 3P) |
Rated Operational Current I_e | 40 A (AC-21A) |
Rated Insulation Voltage U_i | 690 V |
Impulse Withstand Voltage U_{imp} | 4 kV |
Switching Angle | 0^\circ Indexing |
Frame Size | 64 \times 64\text{ mm} |
Contact Material | Silver Alloy (AgNi) |
Protection Degree | IP54 (Front Plate) / IP20 (Terminals) |
Mechanical Life | \ge 100,000 Operations |
Electrical Life | \ge 50,000 Operations |
Operating Temperature | -25°C to +80°C |
Mounting Type | Front Panel Mount |
Ssaoco Dammam
- Started from: Jul 10, 2025
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