1000 pf, 5 KV Peak, Jennings UCSL-1000-5S


Capacitance 7-1000 pf
Voltage Rating 5 KV
Current Rating 42 Amps RMS

The capacitor is a Glass, VARIABLE capacitance, vacuum capacitor. 7-1000 pf capacitance rated at 5 KV peak voltage. These units are removed from equipment, checked, and guaranteed.

Out of stock

Jennings UCSL-1000-5S glass, vacuum, variable capacitor

Rated Capacitance 7-1000 pf
Peak Voltage 5 KV
Current Amps (RMS) Maximum 42 Amps
Shaft Diameter 1/2 inch
Turns for Full Travel Max 14
Important Dimensions
Max Length 8.25 in / 209.55 mm (including shaft)
Max Diameter 3.25 in / 82.55 mm
Weight 29.50 oz. / 836.31 g
The front (shaft and puller end) neck of this capacitor has a larger-than-normal diameter. This model has a front neck diameter of 2.137″, and the FM2 flange will NOT fit. Instead, this model was designed for the front shoulder (the flat end closest to the blue “puller”) to be mounted through a panel or bulkhead by means of three drilled and tapped holes to accommodate mounting screws. The puller would then be mounted on the other side of the panel, with the shaft extending through the panel to operate the capacitor. (Panel would also be drilled with a center hole to accommodate the brass center piston of the capacitor.) With purchase of capacitor, we can furnish a front aluminum L-bracket to take the place of a panel, AT NO ADDITIONAL CHARGE (just request it in “comments”).
FM1C Flange needed for rear end mounting (Available at additional cost) See our flange page: Vacuum Capacitor Flanges
Condition Removed from equipment, checked and guaranteed
(Other variations of this capacitor are sometimes available, inquire)
UCSL-750-3S UCSL-1000-3S UCSL-750-3
UCSL-750-5S UCSL-1000-5S UCSL-750-5
UCSL-1000-3 UCSL-1000-5


“Out of spec” and “budget” capacitors:  If you want the quality and performance of vacuum capacitors, but the budget just won’t allow it, (or if you are just looking to save some money) we frequently have “out of spec” capacitors. These capacitors do not meet the specifications for the particular model. This can happen because of many reasons, but they are still perfectly usable in other capacitance ranges or maximum voltages. For instance, we might have a type that is listed at 15 kv, but tests good to 12 kv.  In this case, we will not sell it to a user who needs 15 kv ratings, but if you need only 5 kv, 7.5 kv, or 10 kv, this capacitor would do nicely.  If you want us to check our “out of spec” shelves for current stock, just tell us your capacitance range and voltage requirements (and current rating if you know it… or approximate power level) and we will let you know what we have available at steep discounts!

“SCRATCH AND DENT” We also frequently have in stock many vacuum capacitors which have cosmetic blemishes such as dents, which would not meet our high standards for regular sale, but which still check good, both in range, and in their ability to withstand voltage.

Some dents will damage or totally destroy a capacitor. Others, if they occur in just the right places, cause no harm at all. We have the knowledge and test capability to make these determinations, and if they pass our stringent testing, sell these units at discounted prices with our regular guarantee! If interested in these units, please inquire as to current availability.

If you don’t see what you wanted: These pages show only a fraction of the stock we have available. We have many thousands of vacuum capacitors, both fixed and variable, as well as vacuum relays. This stock changes daily. If you have requirements for items not listed in these product lines, please Email, and our knowledgeable staff will search our inventory. (Don’t forget to give us your email address and contact information!)

Additional information

Shipping Weight 29.50 oz
Shipping Dimensions 9.25 × 9.25 × 14.25 in


Min Capacitance

Max Capacitance


5 KV

Current Rating

42 Amps

Shaft Diameter

1/2" OD Shaft



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