PTC305CSERIES datasheet(5/8 Pages) VISHAY

5 / 8 page

PTC305C Series

www.vishay.com

Vishay Cera-Mite

Revision: 11-Sep-15

Document Number: 23086

For technical questions, contact: ceramitesupport@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

PTC SELECTION

• Choosing the best PTC for an application is a simple

matter. See Table 4 and Table 2. Vishay Cera-Mite PTCs

are available in three case sizes (A, B, and C)

• Table 4 indicates the correct case size for the application.

Table 2 shows how to choose the correct resistance value

• Using a device too small or resistance too high will give

inadequate starting performance. An oversize device will

not harm the motor, but may not be optimum with regards

to acceleration dynamics, or power dissipation

• The PTC is generally self protecting when applied within

the voltage and current ratings

• All

PTC305C

Series

starters

and

accessories

are

RoHS compliant

Table 4

Notes

(1) Preferred values.

(2) Part number is stamped on the device for UL recognition. The customer part number can also include 1 or 3 character alpha-numeric suffix

to designate specific customer marking and accessory furnished. The suffix is not marked on the part. Certified outline drawing and

complete part number will be furnished on request for specific applications.(Example: PTC305C19K01.) Mounting brackets and other

accessories are to be ordered separately.

(3) RDYN is nominal resistance equal to U/I when 230 V, 50 Hz/60 Hz is applied (see Fig T-7). This resistance determines current and maximum

starting torque at the moment of application of voltage to the motor and can be measured with an oscilloscope.



For receiving inspection or routine trouble shooting, the DC resistance at 25 °C (R25) as measured with an ohmmeter is approximately 50 %

greater. For example: PTC305C20 measured with an ohmmeter would be 35

 ± 30 % tolerance.

(4) Resistance values are duplicated in several case sizes (i.e.: PTC305C20, C12, and C1) to provide longer switch time (t) and higher current

ratings (see Fig. T-7). Larger parts may be needed for more difficult starting conditions (voltage or temperature) or may be used for

accelerating fans against back pressure.

(5) Maximum current in the PTC is determined by



Motor auxiliary winding impedance is usually small compared to PTC resistance, and does not materially affect PTC current.



Current in PTC is a percentage of the full motor inrush (locked rotor) current; usually 30 % to 50 % (see Fig T-5).

(6) In application, the maximum voltage is the voltage that appears across the run capacitor at rated speed, high line, light load. This is not the

applied line voltage (see Fig T-6).



THESE DEVICES ARE INTENDED FOR APPLICATION ON 240 VOLT LINES OR SYSTEMS WITH MAXIMUM LINE VOLTAGE UP TO

265

V. The PTC305C20, 21 and 22 are also used on 120 V systems where the motor is designed to use same run capacitor and PTC as equivalent

230 V compressor.

(7) This is the power used to keep the PTC switched in a high impedance state under full load running conditions at typical ambient

temperature.

(8) BTU and horsepower ranges are for reference only. PTC may be applied outside those ranges as long as maximum voltage and maximum

current are not exceeded. Scroll and rotary compressors may require less starting assistance allowing use of smaller devices.

PTC MOTOR START SELECTION CHART

VISHAY

CERA-MITE

PART



NUMBER (2)

CASE

STYLE (2)

RESISTANCE (

) (3) SWITCH

TIME (4)

(t) s

AT 230 V

CURRENT

RATING (5)

(ARMS)

MAX. VOLTAGE

RATING (6)

(VRMS)

AVG. POWER

DISSIPATION (7)

(W)

COMPRESSOR

RANGE (8)

RDYN

± 20 %

R25

± 30 %

BTU (000)

PTC305C20 (1)

0.25

410

3.5

10 to 28

0.75 to 2.0

PTC305C21

0.35

410

3.5

8 to 18

0.5 to 1.5

PTC305C22 (1)

0.50

410

3.5

5 to 12

0.25 to 1.0

PTC305C19 (1)

0.50

500

20 to 50

1.5 to 4.0

PTC305C12 (1)

0.60

500

18 to 42

1.5 to 3.5

PTC305C2

1.00

500

10 to 25

1.0 to 2.5

PTC305C9 (1)

0.50

500

28 to 68

3.0 to 7.0

PTC305C11

12.5

0.60

500

28 to 62

3.0 to 6.0

PTC305C1 (1)

42.5

1.00

500

14 to 36

1.5 to 3.5

UL File E97640

Maximum Line Voltage

Minimum R

DYN

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