For mechanical and electrical equipment such as lathes, electric ovens, mushroom machines, and other unattended equipment that require continuous operation during production, accidents caused by motor overheating or temperature control failure are common. Using PTC thermistors for motor overheating protection can effectively prevent them. Accidents happen. A common method for protecting motors from overheating is to bury extremely small sensors with PTC thermistor temperature sensing heads in the windings of the motor stator. Under normal circumstances, the PTC thermistor used for motor overheating protection is in a low resistance state and does not affect the performance of the motor. normal operation.When the inside of the motor overheats due to a fault, the PTC thermistor used for motor overheat protection undergoes a sudden change in thermal resistance, and the relay associated with it loses power and is released, and the motor stops running and waits for the fault to be eliminated before it can start running again. The advantage of this protection method is to directly monitor the temperature changes inside the winding, so that the motor can be protected before the overheating temperature breaks through the insulation level of the motor. At the same time, due to the recoverability of the TC thermistor, there is no need to replace it with a new one like a fuse resistor.

　　product description

　　Product Overview of PTC Thermistors for Overheating Protection

　　SCRBH temperature-controlled PTC thermistor utilizes the characteristic that the resistance value of the PTC thermistor rises suddenly above the Curie temperature. When the ambient temperature rises abnormally, the protection circuit equipped with the PTC thermistor changes in resistance value. Connect or disconnect the circuit to protect the components.

　　Main parameters of SCRBH temperature control PTC thermostor

　　Protection temperature point TS(℃)

　　Rated zero power resistance value R25 (Ω)

　　Resistance value at protection temperature (Rs, Min)

　　Protection temperature -15℃ Resistance value (RS-15, Max)

　　1. SCRBH temperature-controlled PTC thermistor series products are divided into two shapes: A-lead type, B-surface mount type

　　2. Protection temperature range: 60~130℃

　　3. Fast response time

　　4. Long-term stability

　　5. Small size and easy installation

　　6. No further settings are required after the product is overheated. 3. Model name, appearance, structure and dimensions:

　　

 

　　DJRBH motor protection PTC thermistor

　　

 

　　Application scope:

　　This product is widely used in situations where over-temperature protection is required. When the product is installed in equipment that requires over-temperature protection, the PTC resistance signal is transmitted to the motor protector. When the temperature approaches the insulation heat-resistant grade, the motor protector disconnects the circuit to implement protection.

　　Features:

　　Made of ultra-small PTC thermistor, it has small size, long life, good stability and high sensitivity. The technical indicators have reached the international level of similar products.

　　use

　　It can be used alone or in series to control the temperature at different points in the same circuit.

　　Technical data

　　The control temperature range is Tk60℃～Tk180℃. The control temperature Tk is set to a specification every 5°C. One to six cores can be produced according to user requirements. The SCRBHC series adopts German DIN 44080, DIN 44081, and DIN 44082 standards.

　　naming method:

　　

 

　　E: 1 temperature sensing head Z: 2 temperature sensing heads D: 3 temperature sensing heads V: 4 temperature sensing heads S: 6 temperature sensing heads

　　Standard lead length DS: 520 200 200 520 DK 520 520 (unit: mm)

　　Regular model:

PTC thermistor parameter data		ES series (single core)	DS series (three cores)	unit
Maximum working voltage	Umax	25	25	V
Rated operating temperature	tk	60～180	60～180	℃
Tk tolerance		±5	±5	℃
Repeatability of Tk	ΔT	±0.5	±0.5	℃
Rated resistance value	R25℃±1℃	≤100	≤300	Ω
Lower limit temperature control point (V≤2.5V)	TK-5(℃)	≤550	≤1650	Ω
Upper limit temperature control point (V≤2.5V)	TK+5(℃)	≥1330	≥3990	Ω
Protection temperature +15℃ resistance value	TK+15(℃)	≥4	≥12	KΩ
Thermal response time	Ts	≤5	≤5	S
Insulation withstand voltage	V	2.5	2.5	KV
Wire pull		Withstand 10N, 10S pulling force without damage.	Withstand 10N, 10S pulling force without damage.	N
Maximum storage temperature	TLmax	160	160	℃
minimum storage temperature	TLmin	-25	-26	℃

working principle

　PTC thermistor has positive temperature coefficient resistance characteristics. When the temperature reaches its Curie point, the phase change of the semiconductor ceramic begins, and its resistance value increases rapidly with the increase of temperature. The change is especially obvious near the control temperature point Tk, thus serving the purpose of controlling the circuit.

　

It is recommended to use the thermistor sensor according to the following table (for reference only)

Control the lead color corresponding to the temperature

protection temperature

30

40

50

60

70

80

90

100

105

110

115

120

125

130

135

140

145

150

155

160

165

170

180

Thread color

Brown

Brown

Brown

white

white

white

green

red

orchid

Brown

orchid

Ash

red

orchid

red

white

white

black

orchid

orchid

orchid

white

white

Thread color

black

red

Ash

Ash

Brown

white

green

red

Ash

Brown

green

Ash

green

orchid

black

orchid

black

black

black

red

Brown

green

red

Hua Ju Temperature Sensor Co., Ltd. overheat protection type PTC thermistor and Murata overheat protection type PTC thermistor interchange comparison table

Huajuan	EPCOS model	KRIWAN model
DJRBH-60-ES	B59100M1060A070	01 D 116
DJRBH-70-ES	B59100M1070A070	01 D 117
DJRBH-80-ES	B59100M1080A070	01 D 118
DJRBH-90-ES	B59100M1090A070	01 D 119
DJRBH-100-ES	B59100M1100A070	01 D 200
DJRBH-110-ES	B59100M1110A070	01 D 210
DJRBH-120-ES	B59100M1120A070	01 D 220
DJRBH-130-ES	B59100M1130A070	01 D 230
DJRBH-140-ES	B59100M1145A070	01 D 240
DJRBH-145-ES	B59100M1140A070	01 D 245
DJRBH-150-ES	B59100M1150A070	01 D 250
DJRBH-155-ES	B59100M1155A070	01 D 255
DJRBH-160-ES	B59100M1160A070	01 D 260
DJRBH-170-ES	B59100M1170A070	01 D 270
DJRBH-180-ES	B59100M1180A070	01 D 280
DJRBH-060-DS	B59300M1060A070	01 D 456
DJRBH-070-DS	B59300M1070A070	01 D 457
DJRBH-080-DS	B59300M1080A070	01 D 458
DJRBH-090-DS	B59300M1090A070	01 D 459
DJRBH-100-DS	B59300M1100A070	01 D 460
DJRBH-110-DS	B59300M1110A070	01 D 461
DJRBH-120-DS	B59300M1120A070	01 D 462
DJRBH-130-DS	B59300M1130A070	01 D 463
DJRBH-140-DS	B59300M1140A070	01 D 468
DJRBH-145-DS	B59300M1145A070	01 D 464
DJRBH-150-DS	B59300M1150A070	01 D 469
DJRBH-155-DS	B59300M1155A070	01 D 465
DJRBH-160-DS	B59300M1160A070	01 D 470
DJRBH-170-DS	B59300M1170A070	01 D 466
DJRBH-180-DS	B59300M1180A070	01 D 467

Installation instructions:
Fix the sensor at the location where the temperature needs to be detected (usually installed in the winding). Do not knock or squeeze the sensor chip hard during installation. Do not let the lead bear tensile force. The lead is connected to the motor junction box. It must be used in conjunction with a motor protector to control motor over-temperature.
Each chip of the three-core sensor is installed at an appropriate position in the three-phase winding, with one core installed in each phase winding.

Motor PTC temperature sensor overheat protection module

Naming rules:

Dimensions

 

Wiring diagram

Technical Parameters

Operating Voltage	24（Vac/Vdc）	110Vac	220Vac
Power frequency	47～63Hz
Power consumption	<1VA
contact current	6A/250VAC (resistive)
Working relative humidity	5%～95%
Working temperature	-20℃～65℃
storage temperature	-25℃～70℃
Transport temperature	-25℃～70℃
The number of thermistors that can be connected in series	1-9 only
Action resistance	single	Double	three
	1KΩ×(1±10%)	2KΩ×(1±10%)	3KΩ×(1±10%)
Recovery resistance	single	Double	three
	500Ω～600Ω	1KΩ～1.2KΩ	1.5KΩ～1.8KΩ
Installation method	Guide rail/fixing hole

PTC temperature control module operating temperature

Thermistor temperature control point	PTC temperature control module action resistance			PTC temperature control module restores resistance value			PTC temperature control module operating temperature	PTC temperature control module restores temperature
TK	single	two	three	single	two	three	TK to TK+5℃	TK to TK-5℃
	1KΩ×(1±10%)	2KΩ×(1±10%)	3KΩ×(1±10%)	500Ω～600Ω	1KΩ～1.2KΩ	1.5KΩ～1.8KΩ

Reference wiring diagram: Take three series connections as an example

Motor overheating protection temperature switch:

DJWKG series temperature-controlled thermal switch (thermal protector) is a temperature-controlled switch specially used for motor overheat protection. This series of thermal switches are mainly suitable for industrial motor products, for motor under-voltage, over-voltage, overload, etc . Faults are reflected in the motor coil temperature, so DJWKG series thermal switches are ideal thermal sensor components for motor protection.

Features:

The DJWKG series temperature-controlled thermal switch (thermal protector) is small in size, sensitive in action, and reliable in performance. Its various indicators have reached the international advanced level. However, when the motor encounters a rapidly changing thermal overload, it cannot protect the motor.