Guangdong Uchi Electronics Co.,Ltd
Guangdong Uchi Electronics Co.,Ltd Manufactuer of Varistor, Thermistor, Capacitor,Fuse & Resistor since 2006 !
Add to Cart
Black PTC Resistor / Smart PTC Thermistor For Degaussing Circuit , Degausser
Quick Details
Single phase induction motors (e.g in compressors for refrigerators and air conditioners) can effectively be started when an auxiliary coil is used in the starting phase. The auxiliary coil is cut off from the circuit after the starting phase. For this purpose, PTC thermistor is employed.
When high voltage is applied to the PTC thermistor, the high current causes PTC thermistor to heat up and eventualy the resistance to increase. A high current flows initially (starting phase ) and then decreases in relation to the increase in resistance. After the starting phase, a low residual current flows the auxiliary coil.
Descirption
PTCR Motor start packages can be economical solid state torque assist for heat pumps, room air, commercial and residential air conditioning and refrigeration systems. PTC thermistors can be used to protect the auxiliary starter winding of induction motors or single phase motors. Compared to the alternative start capacitor and relay, PTCR Motor start devices save several wires, occupy less panel space, mount more easily, and cost less.
Application
Single-phase motorstart assist in refrigerator systems, aircondtioning systems, heat-pumps, small compressors.
Inrush current generation.
Specification
PTCR Motor starter Operating Principles
Single phase induction motors (e.g in compressors for refrigerators and air conditioners) can effectively be started when an auxiliary coil is used in the starting phase. The auxiliary coil is cut off from the circuit after the starting phase. For this purpose, PTC thermistor is employed.
When high voltage is applied to the PTC thermistor, the high current causes PTC thermistor to heat up and eventualy the resistance to increase. A high current flows initially (starting phase ) and then decreases in relation to the increase in resistance. After the starting phase, a low residual current flows the auxiliary coil.
Simple starter circuit of PTC thermistor mortor starter usded in single phase AC motors.
The PTC thermistor is used for delaying the switch-off of the starter auxiliary winding (after the motor has accelerated) to protect the winding from damage.
| | |
PTC motor starter pellets (disk) data sheet
| Nominal Resistance | Max. Voltage | Max. Current | Starting Time | Power Consumption | Recovery Time | Coil Resistance | Switching Temperature | Diameter | Thickness (mm) |
| 4.7 ohm | 180V | 12A | 0.5-2.5S | 3.5W | 100S | 10 ohm | 120C | 19.5+-1.0 | 2.5+-0.2 |
| 6.8 ohm | 200V | 10A | 0.2-1.5S | 3.5W | 100S | 25 ohm | |||
| 15 ohm | 350V | 8A | 0.2-1.5S | 3.0W | 100S | 30 ohm | |||
| 22 ohm | 350V | 7A | 0.2-1.5S | 3.0W | 85S | 30 ohm | |||
| 33 ohm | 350V | 6A | 0.2-1.5S | 3.0W | 85S | 55 ohm | |||
| 47 ohm | 400V | 5A | 0.2-1.5S | 3.0W | 75S | 55 ohm | |||
| 4.7 ohm | 180V | 12A | 0.2-1.3S | 3.3W | 85S | 10 ohm | 120C | 16+-0.5 | 2.5+-0.2 |
| 6.8 ohm | 180V | 10A | 0.2-1.2S | 3.3W | 90S | 10 ohm | |||
| 15 ohm | 350V | 8A | 0.2-1.2S | 2.8W | 100S | 30 ohm | |||
| 22 ohm | 350V | 7A | 0.2-1.0S | 2.8W | 85S | 30 ohm | |||
| 33 ohm | 350V | 6A | 0.2-1.0S | 2.8W | 85S | 30 ohm | |||
| 47 ohm | 350V | 5A | 0.2-1.0S | 2.8W | 80S | 30 ohm |
PTC Thermistor Motor Starter Reliability Data
| Test | Standard | Test conditions | |ΔR25/R25| |
| Switching test at room temperature | IEC 60738-1 | Imax Vmax Number of cycles: 10000 | <25% |
| Rapid change of temperature in air | IEC600628-2-14, Test Na | T=TLCT, T=TUCT Number of cycles: 5 T:30min | <20% |
| Endurance at max. operating temperature and max. operating voltage | IEC 60738-1 | Ambient temperature: +60C Maximum Operating Voltage Current limited to Imax. Time: 24 hours | <25% |
| Storage in damp heat | IEC 600628-2-3 | Temperature of air: 40C Relative humidity of air: 93% Duration: 56 days | <20% |
PTC Thermistor Motor Starter Application Examples
Competitive Advantage:
Factory supply directly
Completed certificates such as UL,VDE,SGS,etc and high quality available
Quick delivery
Best after-sales services
OEM & ODM available