PTC305C Series www.vishay.com Vishay Cera-Mite PTC Thermistors Motor Start Packages FEATURES • Large diameter ceramic pellets for high starting current • Various package sizes for optimum inrush current and switching time • Rugged mechanical construction for reliable long life operation • UL approved packages • Plastic case mold UL 94 V-0 approved • Adapted accessories for easy mounting • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 QUICK REFERENCE DATA PARAMETER VALUE UNIT Resistance value at 25 °C 15 to 75 APPLICATIONS ± 30 % • Single phase motor start assist in 6 to 36 ARMS Switching temperature 110 to 120 °C Switching times (typical) 0.25 to 1.0 s Maximum voltage rating 410, 500 VRMS Operating temperature range -10 to +80 °C Storage temperature range -25 to +105 °C Tolerance on resistance value Maximum current ratings - Refrigerator systems - Air-conditioning systems - Heat-pumps - Small compressors PTC MOTOR START SELECTION CHART VISHAY CERA-MITE PART NUMBER CASE STYLE RDYN () R25 () ± 20 % ± 30 % SWITCH TIME t (s) at 230 V CURRENT RATING (ARMS) MAX. VOLTAGE RATING (VRMS) COMPRESSOR RANGE (BTU 000) COMPRESSOR RANGE (HP) 0.75 to 2.0 PTC305C20 C 25 35 0.25 10 410 10 to 28 PTC305C21 C 35 50 0.35 8 410 8 to 18 0.5 to 1.5 PTC305C22 C 50 75 0.50 6 410 5 to 12 0.25 to 1.0 PTC305C19 B 20 30 0.50 18 500 20 to 50 1.5 to 4.0 PTC305C12 B 25 40 0.60 15 500 18 to 42 1.5 to 3.5 PTC305C2 B 50 85 1.00 12 500 10 to 25 1.0 to 2.5 PTC305C9 A 10 15 0.50 36 500 28 to 68 3.0 to 7.0 PTC305C11 A 12.5 20 0.60 30 500 28 to 62 3.0 to 6.0 PTC305C1 A 25 42.5 1.00 24 500 14 to 36 1.5 to 3.5 PTC MOTOR START ACCESSORY SELECTION CHART ACCESSORY PART NUMBER DESCRIPTION PTCAUX36-520M Round mounting bracket for case style C PTCAUX36-520H Round mounting bracket for case style A and B PTCAUX7-36-5C U-shaped mounting bracket for case style B PTCAUX7-36-4C U-shaped mounting bracket for case style A PTCAUX50-1278 Jumper wire for case style A Revision: 11-Sep-15 Document Number: 23086 1 For technical questions, contact: [email protected] 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 PTC305C Series www.vishay.com Vishay Cera-Mite ECONOMICAL SOLID STATE TORQUE ASSIST FOR HEAT PUMPS, ROOM AIR, COMMERCIAL AND RESIDENTIAL AIR CONDITIONING AND REFRIGERATION SYSTEMS Positive Temperature Coefficient Themistors (PTC) have been used for many years in millions of HVAC applications to provide starting torque assistance to Permanent Split Capacitor (PSC) single phase compressor motors. Safety Agency Recognition Vishay Cera-Mite motor start PTC thermistors are recognized by Underwriter Laboratories file E97640 in accordance with standard for controllers and refrigeration components UL 873 or UL 60730; and Canadian Standard C22.2 No. 24. All packages and accessories are RoHS-compliant. Sizes are available to cover the full range of 120 V/240 V PSC compressor motors. RELATIVE COMPARISON OF VARIOUS MOTOR STARTING METHODS Three methods have historically been employed to generate The importance of each category is dependent upon the motor application and industry sector. starting torque for PSC motors. All are well-proven technologies and may be compared relative to one another based upon categories shown below. In general, if the PTC starter produces sufficient starting torque, it is considered the simplest and most economical choice. Table 1 MECHANICAL ELECTRICAL FINANCIAL SENSITIVE STARTING EASE PANEL ACCELERATION ACCELERATION RESET INVENTORY TO EMI/RFI PURCHASED METHOD OF SPACE TORQUE (SWITCH) TIME TECHNOLOGY MIX RELIABILITY MOUNTING GENERATED COST WIRING REQUIRED PRODUCED TIME REQUIRED REQUIRED DIRECTION Lowest No Lowest Fixed 3 min to 5 min No Solid State Lowest Highest Lowest Start cap Moderate with PTC 2 wire or acting as a 3 wire current relay Medium Yes Medium Fixed 2 min to 5 min No Solid State Medium Medium Medium Start cap Difficult used with 4 wire or potential or 5 wire current relay Highest Yes Highest Variable based on motor speed None Yes Electro Mechanical Highest Lowest Highest PTC starter Simple 2 wire SIMPLIFIED PTC STARTING DIAGRAM Start Sequence When starting the compressor, contactor (M) closes; the PTC, which is at low resistance, provides starting current to the motor’s auxiliary winding. After time delay (t), the current passing through the PTC causes it to heat and “switch” to a very high resistance. At this point the motor is up to speed and the run capacitor (CR) determines the current in the auxiliary winding. The PTC remains hot and at high resistance as long as voltage remains on the circuit. When contactor (M) opens, shutting off voltage to the compressor, the PTC cools to its initial low resistance and is again ready to provide torque assist on the next startup. Restart It is important to provide time between motor starts to allow the PTC to cool to near its initial temperature. This time is usually 3 min to 5 min and is determined by the thermostat (THERM) or separate time-delay relay (TR). Attempts to restart in less time may be successful depending on compressor equalization, line voltage, temperature, and other conditions. If the motor were to stall in a locked-rotor state, overload device (PD or TS) would open the line and a further time delay would occur until the motor overload is reset. Motor start PTCs are applied to compressors having means to equalize pressure during shutdown. Fig T-2 TYPICAL PTC CHARACTERISTICS AS A MOTOR START DEVICE PD TR M AC Line 120 or 240 VOLTS AC M Optional OFF Time Delay TR Relay Protective Device L2 Revision: 11-Sep-15 M PSC MOTOR TS Fig T-3 10 000 Internal Motor Winding Overtemp Switch CURRENT 10.0 MAIN CR AUX. PTC Low Voltage Control Transformers Not Shown 1.0 1000 100 Switch Time (t) 0.1 RESISTANCE PTC Current (ARMS) M Protective Device THERM PTC Resistance () L1 0.01 10 50 150 100 PTC Temperature °C Document Number: 23086 2 For technical questions, contact: [email protected] 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 PTC305C Series www.vishay.com Vishay Cera-Mite START AND ACCELERATION TORQUES SINGLE PHASE PSC HIGH EFFICIENCY COMPRESSORS The use of a PTC start assist insures sufficient acceleration torque to overcome not only breakaway friction, but also parasitic asynchronous torques associated with the 5th and 7th motor harmonics or lamination slot harmonics. The time to accelerate a rotating machine is: 2 2 RPM x WK lb ft accelerating time (s) = -------------------------------------------------------------------------average torque lb ft x 308 average torque = curve B - curve A 1. If (curve B - curve A) is zero or less, the motor may stall. A1 Percent Rated Speed Acceleration Time Considerations 100 2. In calculating torque available from curve B, allowance should be made for cusps in the torque curve due to harmonics. The time needed to accelerate from rest to 1/2 speed is critical, as the average torque available in this region is limited. Select a PTC with sufficient switching time (t) to accelerate the compressor. Full Load Operating Point A2 max. Torque 75 50 B1 B2 25 5th Possible Region of Harmonic Torques 7th Slot 0 100 CURVE A2 Torque req’d to accelerate compressor at partial differential pressure CURVE A1 Torque req’d to accelerate unloaded compressor 3. Scroll and rotary compressors may have less breakaway torque than shown. 200 Percent Rated Torque Cold Breakaway Torque CURVE B1 Motor speed versus torque with run cap only CURVE B2 Motor speed versus torque with run cap and PTCR 4. A compressor with no equalization may require over 100 % starting torque and time as long as several seconds. PTC starters not recommended. CONSIDERATIONS FOR CURRENT IN PTC APPROXIMATE EQUIVALENT CIRCUIT PSC MOTOR AT ZERO SPEED HP x 746 I L run = ---------------------------------- x I L start I L run V M x pf x eff Line Voltage V M For running conditions: If V aux = V M then I M and I aux IL = ------2 IL VM VM If V aux V M then I aux = ------- x ------------ and Z aux = ---------V I 2 aux aux Fig. T-5 L2 L1 IL Then at start, with PTC in series: +Z aux VM I Rstart through PTC = ------------ Z aux VM 1 I Cstart through Run Cap = -------; X C = ------------- XC 2fC I aux start = I R start +I Vaux IR * R and X are total of stator and rotor Fig T-6 Simplified voltage diagram of the PSC motor at operating speed. Note (1) I (auxiliary current) leads I (main current) by 80° to 90° when C A M (run capacitor) is chosen for balanced operation at 3/4 to full load. Line Power Factor = sine 2 C start C This closely approximates the condition for motors over 1/2 HP Xaux Raux PTC If Zaux is low impedance, less than 10 % of RPTC VM then it can be ignored and IPTC at start = ---------------- R PTCR Revision: 11-Sep-15 Ic C V M x I M = V aux x I aux . In many cases the auxiliary Volt-Amperes are limited to about 50 % of the main winding Volt-Amperes to get 50 % to 70 % rated torque. PTC XM (1) I aux For the greatest starting torque, PTC should be chosen to make: Z' aux = R RM (1) IM V PT =V C xC = IA VM Applied Voltage (1) IA IM (1) VA Document Number: 23086 3 For technical questions, contact: [email protected] 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 PTC305C Series www.vishay.com Vishay Cera-Mite EFFECT OF PTC RESISTANCE ON STARTING TORQUE OF PSC MOTORS Table 2 MOTOR HP LOCKED ROTOR TORQUE WITH (TABLE 4) RUN CAP ONLY % RATED TORQUE (NOTE 7) (SEE A) STARTING TORQUE WITH RUN CAP AND PTC (% RATED TORQUE) (SEE B) RESISTANCE (RDYN) 20 12.5 10 0.5 25 % to 35 % 70 % to 100 % 80 % to 100 % 50 25 NA NA NA 1 25 % to 35 % 50 % to 70 % 70 % to 100 % NA NA NA 2 20 % to 30 % 40 % to 60 % 60 % to 90 % 3.5 20 % to 30 % NA 40 % to 60 % 50 % to 85 % 60 % to 90 % 5 15 % to 25 % NA NA 40 % to 60 % 50 % to 75 % 60 % to 90 % 6.5 15 % to 25 % NA NA NA 40 % to 70 % 50 % to 80 % A. Rated torque is the torque at full speed rated load. It is calculated as: HP x 5250 Torque lb - ft = ---------------------------RPM The range shown includes both normal slip and high efficiency low slip motors. Starting torque varies as: (Line Voltage)2 70 % to 100 % 70 % to 100 % 80 % to 100 % 70 % to 100 % B. Figure T-4 shows effect of using PTC to increase starting torque. For reciprocating compressors, it is advised to choose a resistance value that gives at least 50 % rated torque at locked rotor. Scroll and rotary compressors may require less torque. TYPICAL PTC CURRENT VS. TIME SHOWING DEFINITION OF RDYN AND SWITCH TIME (t) Fig T-7 Time (t) KM (130 °C - T0) OSCILLOSCOPE Peak Current IPTC (ARMS) (Normalized) SHUNT R DYN = 20 % Peak Current M = PTC mass (g) T0 = PTC temp at time 0 K = 0.75 J/g/°C IPTC ERMS 230 VRMS IPTC max. RDYN V2PTC PTC Switch Time (t) 0 0.1 0.2 Motor Contactor Closes 0.3 0.4 0.5 0.6 0.7 Time to Switch (s) START CAPACITOR REPLACEMENT Capacitor Starting Comparison Some PSC motors have historically been started with a capacitor and relay. To deliver the same starting current as a start capacitor, a PTC resistance is available for approximately equal ohms. Table 3 can be used for conversion. Even though the start current may be the same, the start torques may differ depending on the motor design.The PTC has a fixed time built in. The start capacitor will stay in the circuit until a relay switches it out. The longer time provided by the capacitor and relay may be needed on applications where equalization is not present or adequate reset time is not available. Revision: 11-Sep-15 0.8 PTC Switchout STARTING CURRENT APPROXIMATION BASED ON 1 X C = ------------2fC Table 3 START CAPACITOR PTC VALUE 50 μF 50 75 μF 37.5 100 μF 25 125 μF 20 200 μF 12.5 250 μF 10 Document Number: 23086 4 For technical questions, contact: [email protected] 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 PTC305C Series www.vishay.com Vishay Cera-Mite 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) 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 • Table 4 indicates the correct case size for the application. Table 2 shows how to choose the correct resistance value • All PTC305C Series starters and accessories are RoHS compliant • Using a device too small or resistance too high will give inadequate starting performance. An oversize device will Table 4 PTC MOTOR START SELECTION CHART VISHAY CERA-MITE PART NUMBER (2) CASE STYLE (2) RESISTANCE () (3) RDYN ± 20 % R25 ± 30 % SWITCH TIME (4) (t) s AT 230 V CURRENT RATING (5) (ARMS) COMPRESSOR MAX. VOLTAGE AVG. POWER RANGE (8) (6) (7) RATING DISSIPATION (VRMS) (W) BTU (000) HP PTC305C20 (1) C 25 35 0.25 10 410 3.5 10 to 28 PTC305C21 C 35 50 0.35 8 410 3.5 8 to 18 0.5 to 1.5 PTC305C22 (1) C 50 75 0.50 6 410 3.5 5 to 12 0.25 to 1.0 PTC305C19 (1) B 20 30 0.50 18 500 7 20 to 50 1.5 to 4.0 PTC305C12 (1) B 25 40 0.60 15 500 7 18 to 42 1.5 to 3.5 PTC305C2 B 50 85 1.00 12 500 7 10 to 25 1.0 to 2.5 PTC305C9 (1) 0.75 to 2.0 A 10 15 0.50 36 500 9 28 to 68 3.0 to 7.0 PTC305C11 A 12.5 20 0.60 30 500 9 28 to 62 3.0 to 6.0 PTC305C1 (1) A 25 42.5 1.00 24 500 9 14 to 36 1.5 to 3.5 UL File E97640 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 Maximum Line Voltage ------------------------------------------------------------Minimum R DYN 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. Revision: 11-Sep-15 Document Number: 23086 5 For technical questions, contact: [email protected] 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 PTC305C Series www.vishay.com Vishay Cera-Mite DIMENSIONS FOR PTC MOTOR START DEVICES in inches (millimeters) • PACKAGED MOTOR START PTCS 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 A. For proper mounting a bracket has to be ordered separately. Fig T-8 0.609 (15.45) 0.641 (16.30) 1.780 (45.2) max. Weld Projection (2) SAP ORDERING PART NUMBER CASE C PTC305C20 PTC305C21 PTC305C22 0.975 (24.75) 1.025 (26.05) 0.25 (6.35) Typ. MOUNTING BRACKET PTCAUX36-520M (Round) 0.329 (8.35) 0.358 (9.10) 0.135 0.140 DIA. (3.50 ± 0.07) 0.050 (1.25) HT. TYP. 0.175 (4.45) WD. TYP. Round Bracket - Spring Steel Phosphate & Oil Finish. Accepts #6 Sheet Metal Screw 0.200 (5.1) max. 0.810 (20.6) 0.880 (22.4) 0.920 (23.35) 0.980 (24.90) 0.298 (7.55) 0.328 (8.35) Case Style B Case Style B is a 2-terminal single pellet unit with current carrying capacity up to 18 A. For proper mounting a U shaped or round bracket has to be ordered separately. 0.579 (14.7) 0.609 (15.5) SAP ORDERING PART NUMBER CASE B PTC305C2 PTC305C12 PTC305C19 MOUNTING BRACKET PTCAUX7-36-5C (U-shaped) PTCAUX36-520H (Round) Fig T-9 Weld Projection (3) 0.050 (1.27) HT. Typ. 0.175 (4.45) WD. Typ. 0.15 (3.81) OD x 0.055 (1.4) HT 4 places 0.25 (6.35) Typ. 0.650 (16.5) max. 2.37 (60.2) max. 1.344 (34.1) 1.406 (35.9) 0.25 (6.35) max. 2 places 0.20 (5.1) Typ. 1.50 (38.1) max. 1.475 (37.45) 1.525 (38.75) 0.550 (13.95) 0.213 0.223 DIA. 0.110 (2.8) Nail Pierce 0.580 (14.75) (5.54 ± 0.13) 0.120 (3.05) Ref. 0.990 (25.1) 1.010 (25.7) 0.135 DIA. 0.140 (3.50 ± 0.07) 1.490 (37.8) 1.510 (38.4) 1.430 (36.3) 1.530 (38.9) 1.05 (26.7) 0.298 (7.55) 0.328 (8.35) 1.44 (26.7) max. Steel U-Bracket - Accepts #8 Sheet Metal Screw Case Style A Case Style A is a 3-terminal device that incorporates two pellets to be connected in parallel, resulting in lower resistance values and current carrying capacity up to 36 A. For proper mounting a U shaped or round bracket has to be ordered separately. To connect the two PTC pellets in parallel, a jumper wire can be ordered separately. CASE A PTC305C1 PTC305C9 PTC305C11 2.75 (69.9) max. (to end of Q.C.) 0.20 (5.1) Typ. 0.15 (3.8) OD x 0.055 (1.4) HT 4 Places 0.990 (25.1) 1.010 (25.7) 1.716 (43.6) 1.781 (45.4) Weld Projection (2) 0.050 (1.27) HT. Typ. 0.175 (4.45) WD. Typ. 1.50 (38.1) max. 0.650 (16.5) max. WIRE JUMPER PTCAUX50-1278 (9.75" (248) Long 105 °C wire) 0.135 DIA. 0.140 (3.50 ± 0.07) 1.490 (37.85) 1.510 (38.35) 1.590* (40.4) 1.690 (43.0) 0.25 (6.35) max. 3 Places MOUNTING BRACKET PTCAUX7-36-4C (U-shaped) PTCAUX36-520H (Round) 1.475 (37.45) 1.525 (37.75) 0.550 (13.95) 0.185 DIA. 0.110 (2.8) Nail Pierce 0.580 0.190 (14.75) (4.75 ± 0.08) 0.120 (3.05) Ref. 0.25 (6.35) Typ. Round Bracket - Spring Steel Phosphate & Oil Finish. Accepts #6 Sheet Metal Screw SAP ORDERING PART NUMBER Fig T-10 5.25 (133.5) max. 0.579 (14.7) 0.609 (15.5) * Installed Dimension 1.05 (26.7) 1.44 (36.6) max. 0.298 (7.55) 0.328 (8.35) Steel U-Bracket - Accepts #8 Sheet Metal Screw 0.579 (14.7) 0.609 (15.5) Round Bracket - Spring Steel Phosphate & Oil Finish. Accepts #6 Sheet Metal Screw OPERATING TEMPERATURE CONNECTION DIAGRAMS Under normal operation, the ceramic pellet inside the case can reach a temperature 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 V wiring are recommended. PTC Thermistors 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 Motor Run Cap A Style 3-Terminal Case Revision: 11-Sep-15 B & C Style 2-Terminal Case Document Number: 23086 6 For technical questions, contact: [email protected] 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 PTC305C Series www.vishay.com Vishay Cera-Mite VISHAY CERA-MITE MOTOR START FEATURES ADVANCED CERAMIC ENGINEERING FOR HVAC Vishay Cera-Mite’s capability in large diameter ceramic pellets, unique formulations tailored to motor starting, and heavy duty electrode systems, have been developed and proven with the cooperation of HVAC industry experts over a period of more than 30 years. INHERENT PERFORMANCE Large diameter pellets make possible low resistance start devices needed to match torque requirements of high efficiency compressor motors. Various package sizes offer selection of timing intervals, providing optimum switching time without dependence on sensing speed, counter EMF, or current. RUGGED MECHANICAL CONSTRUCTION Vishay Cera-Mite PTC cases are molded from a UL 94 V-0 high temperature, engineered plastic/glass composite. Heavy duty aluminum contact plates and stainless steel force springs are scaled to the pellet sizes and current ratings to insure no internal arcing and to enhance quick reset time. Unbreakable metal mounting brackets, sold separately, attach securely with a single screw. The “U” - brackets developed by Vishay Cera-Mite feature lower power consumption and greater reliability by maximizing case to ground thermal impedance. SIMPLE AND ECONOMICAL A solid state device requiring only 2 quick connect wires and one bracket screw to install. Compared to the alternative start capacitor and relay, PTC start devices save several wires, occupy less panel space, mount more easily, and cost less. OUTSTANDING RELIABILITY Over a twenty year period, with an installed base of millions of Vishay Cera-Mite PTC start devices, experience has demonstrated reliability at 1.0 FIT or less. Users have benefited from very low warranty expense. RESTART CONSIDERATIONS A properly sized PTC will provide adequate starting current and starting time with a cool down time of 3 min to 5 min, coordinating perfectly with standard “off delay” equalization timers restart characteristics of the three case sizes are shown. Fig T-13 Fig T-14 Fig T-15 CASE STYLE C CASE STYLE B 100 100 CASE STYLE A 100 Cold Start Cold Start Cold Start 75 75 75 % Initial 50 Current 50 50 5 Min Cooling 25 0 Revision: 11-Sep-15 3 Min Cooling 0 0.2 3 Min Cooling 5 Min Coolin g 3 Min Cooling 5 Min Cooling 25 25 0.4 0.6 Time (s) 0.8 0 0 0.2 0.4 0.6 Time (s) 0.8 1.0 0 0 0.2 0.4 0.6 0.8 Time (s) 1.0 1.2 Document Number: 23086 7 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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