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[China]
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Address: No.1, Yixiang ,Liwu Industrial Park,Liwuyuan Village,Xihu District, Shilong Town,Dongguan 523325,Guangdong ,China
Contact name:James Lai
Dongguan Ampfort Electronics Co., Ltd. |
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Precise Repeatability 91-KD3x5 MZ6-120-DS Triple PTC Thermistor Motor Protection
- Basic information Of The PTC Thermistor Motor Protection
PTC thermistors are ceramic semi-conductors which because of the
very high Positive Temperature Coefficient lend themselves to
a variety of applications.
- Applications Of The PTC Thermistor Motor Protection
Specially constructed versions of these products are available
and this facility enables most applications to be catered for.
Most typical application for PTC thermistors is to protect the
windings of heavy duty motors and transformers.
- General function Of The PTC Thermistor Motor Protection
The PTC thermistor, for the thermal protection of electrical
machines, is a temperature dependent component. The rated
operating temperature (ROT) corresponds to the curie point
temperature of the ceramic. The resistance, of the PTC
thermistor, rises very steeply with relatively small increases
in temperature, thus triggering the switching function.
- Advantages Of The PTC Thermistor Motor Protection
• Precise repeatability of the response point.
• Long hysteresis free switch cycle life.
• Extremely cost effective.
• Steep temperature-resistance curve characteristic allows for
simple evaluation electronics.
• Current self-limiting.
• Light weight.
• Low thermal time constant.
• Extremely small designs are available.
- Technical Specifications Of The PTC Thermistor Motor Protection
| Technical Specifications | Single PTC | Triple PTC | Units | |
| Max working voltage | Umax | 30 | 30 | V |
| Normal using voltage | V | ≤2.5 | ≤2.5 | V |
| Rated action temperature | Tk | 60~180 | 60~180 | ℃ |
| Tk tolerance | ±5 | ±5 | ℃ | |
| Tk repeatability | △T | ±0.5 | ±0.5 | ℃ |
Resistance in norm al temperature T=25±1℃(V≤2.5V) | R25 | ≤100 | ≤300 | Ω |
PTC resistance at some temperature(V≤2.5V) | TK-5℃ | ≤550 | ≤1650 | Ω |
PTC resistance at some temperature(V≤2.5V) | Tk+5℃ | ≥1330 | ≥3990 | Ω |
PTC resistance at some temperature(V≤2.5V) | Tk+15℃ | ≥4 | ≥12 | KΩ |
| -20℃~Tk-20℃ | ≤250 | ≤750 | Ω | |
| Tk reaction time | Td | <5 | <5 | S |
| Insulation strength | V | 2.5 | 2.5 | KV |
| Maximum storage temperature | T1max | 125 | 125 | ℃ |
| Minimum storage temperature | T1min | -25 | -25 | ℃ |
| Lead wire color | See the colorful coding below | |||
| Weight | Wt | 2 | 3.5 | g |
- Operating Instruction Of The PTC Thermistor Motor Protection
The electric motor of different insulation rank selects the
different Tk temperature thermistor, its parameter is shown at
following table(only reference).
| Electric motor insulation rank | Limited Working Temperature | Thermistor(TK) |
| Y | 90 | 80~85℃ |
| A | 105 | 95~100℃ |
| E | 120 | 110~115℃ |
| B | 130 | 120~125℃ |
| F | 155 | 145~150℃ |
| H | 180 | 170~175℃ |
| C | Above 180 | Above 180 |
- Note for mounting Of The PTC Thermistor Motor Protection
1.Insert wire in the winding wire slot of the motor,make it tidy,
and then mount the PTC thermistor in the coil of motor(as shown in
figure).
2.White mounting,do not hard beat or press the sensing area of the thermistor for fear that the internal precise structure of the product might be damaged.
3. While mounting,do not extremely hard pull the outgoing line of the product for fear that the outgoing line might be pulled apart.
4.Before connecting,read the technical information about PTC temperature control module(the former GRB motor overheat protector) for fear that the thermistor might be damaged.
5.Securely connect the outgoing line in the specified connection position.
- Error and Measure
| Breakdown | Reason | Measure |
| Resistance value is too high(measure resistance of the outgoing line by Ohm band of an AVO meter,the resistance value of a single line is higher than 100Ω at 25℃) | 1. The lead of the thermistor opened a way or was in a bad contact. 2. The thermistor was damaged. | 1.Check the lead of the thermistor whether open or not,or in the bad contact 2.Replace the themistor |
| Resistance value is too high(measure resistance of the outgoing line by Ohm band of an AVO meter,the resistance value of a single line is higher than 20Ω at 25℃) | 1.The lead of thermistor was in short circuit; 2.The thermistor was damaged
| Check the lead of the thermistor is in short circuit or not,and connect it. 2,Replace the thermistor
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| Sometimes be Normal,Sometimes be abormal, | 1.The lead of thermistor was in in bad contact; 2.The thermistor was damaged
| Connect the lead of the thermistor and the binding post tightly. 2.Replace the thermistor |
