Current Operated Switches,  Adjustable and LED indicator
The  641 a solid state current switches that operate when the current level sensed by the internal current transformer exceeds a adjusted setpoint. Internal circuits are totally powered by induction from the conductor being monitored. There is zero off-state leakage current in the solid state relay output which can switch AC or DC circuits. Currents up to 250 amps can be monitored. For higher currents or larger diameter conductors, use an external current transformer.

• Adjustable from 1.5 to 150 Amp.
• Lowest cost
• Switch AC or DC circuits
• Applicable for VFD applications down to 6Hz
• Powered by monitored line
• Split core model clamps easily around cables
• 5 year warranty
• UL listed and CE Certified