INCH-POUND
MIL-PRF-19E
31 July 2007
SUPERSEDING
MIL-PRF-19D
11 June 1999
PERFORMANCE SPECIFICATION
RESISTOR, VARIABLE, WIREWOUND (LOW OPERATING
TEMPERATURE), GENERAL SPECIFICATION FOR
This specification is approved for use by all Department
and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers the general requirements for variable resistors having a resistance element of
wirewound on an insulating strip shaped in an arc, so that a contract bears uniformly on the resistance element when
adjusted by a control shaft. These resistors are capable of full load operation at an ambient temperature of +40OC
and are capable of continuous operation when properly derated, at a maximum temperature of +105OC.
1.2 Classification
1.2.1 Part or Identifying Number (PIN). The PIN is identified in the following form and as specified (see 3.1 and
6.2):
RA30
N
A
SK
103
A
⏐
⏐
⏐
⏐
⏐
⏐
Operating
Resistance
Resistance
shaft and
Style
Bushing
Switch
Characteristic
(1.2.1.5)
length
(1.2.1.1)
(1.2.1.3)
(1.2.1.2)
(1.2.1.6)
(1.2.1.4)
1.2.1.1 Style. The style is identified by the two letter symbol "RA" followed by a two-digit number; the letters
identify low operating temperature, wirewound, variable resistors and the number identifies the size and power rating.
1.2.1.2 Bushing. The type of bushing is identified by a single letter in accordance with table I.
TABLE I. Bushing.
Symbol
Bushing
N
Standard
L
Locking
S
Shaft and panel-seal (standard)
T
Shaft and panel seal (locking)
Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus,
ATTN: DSCC VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or by email Resistor@dla.mil. Since contact
information can change, you may want to verify the currency of this address information using the ASSIST Online
database at https://assist.daps.dla.mil/ .
AMSC N/A
FSC 5905
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