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For forced commutation of SCRs such as in inverters and choppers
these capacitors are ruggedly designed to carry heavy currents.
They employ a non-inductively wound oil impregnated paper
polypropylene mixed dielectric coil with aluminium foil as
electrode. Encased in aluminium can and offered in axial threaded
screw terminals these are generally popular in values from
1 mF to 4 mF and in voltage rating of 1000 VDC. A special
constructional feature provides for an explosion proof performance
through the means of an open circuiting of the element when
excessive current flows through the capacitor under fault
conditions
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