The 1494G-EF3H2 is a 400A model within Allen-Bradley®'s 1494G series of heavy-duty industrial safety disconnect switches, specifically designed for high-load industrial applications.
Core Electrical Parameters
Parameter Category Specification Value
Rated Current 400 A
Rated Voltage 600V AC / 250V DC
Insulation Class UI (UL/IEC): 660V
Horsepower Output - 250 HP at 480V AC
- 350 HP at 600V AC
Short-Circuit Withstand 200,000 A (with Class J/R fuses)
Dielectric Strength 2200V for 1 minute
Contact Type SPDT (Single Pole Double Throw)
Mechanical and Structural Characteristics
Enclosure Protection
• Protection Rating: Type 4/4X (IP66 dustproof and waterproof, stainless steel construction)
• Corrosion Resistance: Suitable for Class I Div 2/Class II Div 1 hazardous environments
• Visual Blade: Directly displays circuit on/off status, complying with NFPA 79 safety standards
Operating Mechanism
• Handle Type: Side-mounted metal handle, supporting three padlocks to lock in the OFF position
• Mechanical Life: 10,000 operations (typical)
• Switching Frequency: ≤240 operations/hour (upper limit for the 400A model)
Mounting Interface
• Conduit Connection: 1/2 NPT standard interface
• Terminal Torque:
◦ Wire Terminals: 275 lb-in (31.07 N·m)
◦ Terminal Mounting Bolts: 175-200 lb-in (19.77-22.60 N·m)