250 pf, 10 KV Peak, Jennings UCSF-250-10S


Capacitance 5-250 pf
Voltage Rating 10 KV
Current Rating 50 Amps RMS

The capacitor is a Glass, VARIABLE capacitance, vacuum capacitor. 5-250 pf capacitance rated at 10 KV peak voltage. These units are removed from equipment, checked, and guaranteed.

0 in stock

Jennings UCSF-250-10S glass vacuum variable capacitor

Rated Capacitance 5-250 pf
Peak Voltage 10 KV
Current Amps (RMS) Maximum 50 Amps
Shaft Diameter 1/2 inch shaft
Turns for Full Travel Max 27
Important Dimensions
Max Length 7.69 in / 195.33 mm (including shaft)
Max Diameter 3.57 in / 90.69 mm
Weight 34.00 oz / 963.88 g
FM2 Flange needed for front end mounting and FM2B 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)
UCSF-250-7.5S UCSF-250-10S UCSF-250-15S
UCSF-500-7.5S UCSF-500-10S UCSF-500-15S


“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 34 oz
Shipping Dimensions 11.56 × 11.56 × 15.69 in


Min Capacitance

Max Capacitance


10 KV

Current Rating

50 Amps

Shaft Diameter

1/2" OD Shaft

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