305C21 Datasheet, PDF (5/6 Pages) Vishay Siliconix – PTCR Motor Start Packages PSC Single Phase Motor Start Assist

PTCR Motor Start Packages
305C Series
Vishay Cera-Mite
DIMENSIONS FOR PTCR MOTOR START DEVICES - IN INCHES
• PACKAGED MOTOR START PTCRs ARE OFFERED IN THREE DIFFERENT CASE SIZES TO
ACCOMMODATE THE RANGE OF PSC COMPRESSOR MOTORS SERVED.
CASE STYLE C
Case Style C is a 2-terminal single pellet
device with current carrying capacity
up to 10 amperes. It is furnished with a
round mounting bracket.
CASE C
305C20 — Black
305C21 — Black
305C22 — Black
MOUNTING BRACKET
36-520M — Round
Fig T-8
.920
.980
1.780
.609
max
.641
Weld
Projection (2)
.050 HT. TYP.
.175 WD. TYP.
.975
1.025
.298
.328
.329
.358
.135
.140
DIA.
Round Bracket — Spring Steel Phos-
phate & Oil Finish. Accepts #6 Sheet
Metal Screw
.810
.880
.200
max
.579
.609
CASE STYLE B
Case Style B is a 2-terminal single
pellet unit with current carrying capacity
up to 18 amperes. Depending upon
the model, either a U-shaped or round
bracket is furnished.
Fig T-9
Weld
Projection (3)
.050 HT. TYP.
.175 WD. TYP.
2.37 max
.15 OD x .055 HT
4 places
.650
max
.25 max.
2 places
1.344
1.406
.20
TYP.
1.50
max
CASE B
305C2 — Black
305C12 — Black or Blue
305C19 — Blue
.213
.223
DIA.
.550
.110 Nail Pierce .580
.120 REF.
.990
1.010
1.490
1.510
1.430
1.530
1.05
1.44
max
U-Bracket — Spring Steel Zinc Dichromate
Finish. Accepts #8 Sheet Metal Screw
MOUNTING BRACKET
7-36-5C — U-Shaped
36-520H — Round
1.475
1.525
.298
.328
.135
.140
DIA.
.579
.609
Round Bracket — Spring Steel Phosphate &
Oil Finish. Accepts #6 Sheet Metal Screw
CASE STYLE A
Case Style A is a 3-terminal device that
incorporates two pellets in parallel, resulting in
lower resistance values and current carrying
capacity up to 36 amperes. A jumper wire to
complete the parallel connection with the two
internal pellets is required.
Fig T-10
5.25 max
2.75 max
(To End of Q.C.)
.20 TYP.
.15 OD X .055 HT
4 Places
.25 max
3 Places
1.716
1.781
Weld
Projection (2)
.050 HT. TYP.
.175 WD. TYP.
.650
max
1.50
max
CASE A
305C1 — Blue
305C9 — Tan
305C11 — Tan
MOUNTING BRACKET
7-36-4C — U-Shaped
36-520H — Round
.185
.190
DIA.
.990
1.010
1.590
1.690
.550
.110 Nail Pierce .580
.120 REF.
1.490
1.510
1.05
1.44
max
U-Bracket — Spring Steel Zinc Dichromate Finish.
Accepts #8 Sheet Metal Screw
WIRE JUMPER
50-1278 — 9.75” Long
105°C Wire
1.475
1.525
.298
.328
.135
.140
DIA.
.579
.609
Round Bracket
— Spring Steel Phosphate & Oil Finish.
Accepts #6 Sheet Metal Screw
OPERATING TEMPERATURE
Under normal operation, the ceramic
pellet inside the case reaches a tem-
perature of 150°C. The plastic case
material has been recognized by UL for
operation up to this temperature. The
actual temperature on the outside of the
case will be approximately 100°C while
the motor is running. An appropriate
mounting location and 105°C, 600 volt
wiring are recommended.
CONNECTION DIAGRAMS
PTCR Motor Start units are connected directly across the PSC motor’s “run”
capacitor. Case style A is a 3-terminal device and uses an external jumper wire to
connect the two internal pellets in parallel. A special “piggyback” terminal on the
jumper wire provides for two connections on one side of the A-style case.
Fig T-11
Fig T-12
Motor Run
Cap
A Style
3-Terminal Case
Motor Run
Cap
B & C Style
2-Terminal Case
Document Number: 23086
Revision 14-May-02
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