Current Limiting System Protection


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With the ever-increasing demand for electrical energy, electrical systems have been forced to expand and grow. Increased substation capacity, on site and distributed generation all contribute to subsequent increases in available fault currents imposed on equipment. This short-circuit current may exceed the thermal, mechanical and interrupt capability of the system, potentially causing a catastrophic failure.

The CLiP-LV® is an electronically sensed and triggered, commutating form of current limiter, sometimes referred to generically as an Is-Limiter. A built-in current transformer (CT) provides real time current values to the internal electronics. The CLiP-LV® has a field adjustable instantaneous pickup setting referred to as the trigger level. If the current exceeds the user-defined trigger level, a signal is sent by the firing logic to interrupt the current. A continuous copper busbar path carries the continuous current, which is opened during overcurrent conditions, while a parallel connected current-limiting fuse interrupts the fault. The CLiP-LV®’s unique ability provides high continuous current ratings with current limitation and ultra-high-speed operation in one package. This makes it an economical solution to protect against short-circuit interruptions without having to add new equipment.


CLiP®-LV Brochure
Key Benefits
  • Single phase & three phase protection

  • Field-selectable trigger levels (pick-up)

  • Remote enable / disable

  • Remote trip indication

  • Outdoor compatible without an enclosure

  • No fuse aging associated with transients or inrushes

  • Copper busbar for lowered system losses

  • Threshold current sensing (does not use transient susceptible rate of rise current sensing)

Electrical Ratings Chart for CLiP-LV®
Voltage Class 750V
Continuous Current (rms, stm) Up to 4,000A*
Interrupting rating (rms, sym) Up to 200kA*
Available trip levels Up to 30kA* instantaneous
Clearing time Interrupt between 1/4 – 1/2 cycle in accordance with
UL-248-1 and IEC 60269
Input Voltage requirements 24 – 250V AC/DC; 150W peak, 60W nominal
*Contact your local G&W sales representative for alternate ratings.