307C Motorstart Thermistors
Vishay Cera-Mite
PTCR Motor Start Pellets
SOLID CERAMIC
DISC
APPLICATION DATA
• Complete range of size/resistance combinations for 120 and 240 volt
compressor motors.
• Rugged silver electrodes well suited for long life pressure contact
mounting.
BASE
ELECTRODE
D
• Withstand voltage is 2 times Voltage Max. rating.
• Application engineering assistance provided for custom
pellet designs.
SILVER
ELECTRODE
PTCR MOTOR START PELLETS
T
VOLTAGE CURRENT DIAMETER (D) x
RESISTANCE
MAX.
MAX.
THICKNESS (T)
(mm)
PART
Vishay Cera-Mite offers a complete line of PTCR
motor start pellets designed for OEM pressure
contact mounting. Compressor and refrigerator
manufacturers, as well as selected HVAC after-
market distributors have chosen to design and
build their own proprietary motor start devices.
Such cost effective units allow for unique mounting
styles, special terminal arrangements, and
combination devices including start capacitors or
overload protectors.
R25 (OHMS) RDYN (OHMS)
(VRMS
200
180
200
150
200
200
250
300
300
180
180
200
200
265
320
300
300
350
400
160
180
180
200
230
250
300
400
355
400
430
175
350
350
380
400
400
400
400
)
(ARMS
10
12
10
10
10
10
7.5
6.5
5.5
15
12
10
10
6
)
NUMBER
307C1674*
307C1670
307C1700*
307C1280
307C1711*
307C1713
307C1490
307C1136
307C1043
307C1614
307C1668
307C1644
307C1651
307C1190
307C1720
307C1066
307C1040
307C1284
307C1283
307C1411
307C1484
307C1544
307C1399
307C1489
307C1476
307C1530
307C1531
307C1282
307C1533
307C1292
307C1487
307C1529
307C1545
307C1640
307C1518
307C1024
307C1409
307C1410
5
4
4.2
5
5.8
16 x 2.5
16 x 2.5
16 x 2.5
16 x 2.5
16 x 2.5
16 x 2.5
16 x 2.5
16 x 2.5
16 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
17.5 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 2.5
20 x 3.2
20 x 3.2
20 x 3.2
20 x 3.2
20 x 5.0
20 x 5.0
20 x 5.0
20 x 5.0
5.5
6.8
8
10
10
20
47
68
4
7.2
7.2
13.5
30
42
3.2
4
5
6.8
10
15
20
25
33
47
68
3.3
4.7
5.6
6.8
10
12
15
22
33
47
68
3.9
12
14
30
25
38
50
75
5
7.2
10.5
FOR USE IN:
13
8
17
22
30
7.5
6.5
4
42
4
2.6
3.5
4.1
5
7.2
12
12
12
10
9
8.5
10.5
8.5
8
Motor Start Relays
15
22
8
6
30
42
5
4
3 (@ 50V)
10.3 (@ 100V)
12 (@ 100V)
15.9 (@ 240V)
18 (@ 240V)
25 (@ 240V)
35 (@ 240V)
50 (@ 240V)
16
8
8
12
9
9
7.5
5.5
R25 = zero power resistance ± 30% at 25°C; other tolerances available.
RDYN = nominal dynamic (effective) resistance, 120V applied unless otherwise noted.
*High performance ceramic formulation, lower transition temperature provides reduced
power consumption for energy concious applications.
Note: All motor start pellets receive 100% resistance and 100% voltage pulse burn-in
simulating actual motor start-up.
Combination Assemblies
Note: Selected pellets carry UL recognition per File E107611.
Note: Usage requires packaging materials appropriate for maximum pellet surface
temperature of 180°C.
Document Number: 23087
Revision 14-May-02
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