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PTC Thermistors Limit Temperature Sensors for Motor protection
1 PTC Single Sensor & 3 PTC Triple Sensors

PTC Thermistors Limit Temperature Sensors for Motors protection Description

PTC Thermistors, Sleeve Type for Over-Temperature Protection, intended for over-temperature sensing of windings in electric motors, coils, transformers, equpment, machines, etc. Available as 1 PTC single sensor & 3 PTC in series triple sensors.

PTC Thermistors Limit Temperature Sensor for Motor protection Application

°§Thermal protection of winding in electric motors.
°§Limit temperature monitoring.
°§PTC relay units.
°§Industrial electronics.
°§Power supplies.
°§Electronic data processing.
°§Electric equipment machines.

Features of PTC Thermistors Limit Temperature Sensors for Motor protection

°§Thermistor pellet with insulating encapsulation
°§Low resistance type, steep R/T curve.
°§Fast response due to small dimensions.
°§Characteristics for sensing temperatures conform with DIN 44081 for 1 PTC single sensor, DIN 44082 for 3 PTC in series triplet sensors.
°§No need to reset supply after over-temperature switch.
°§For 1 PTC single sensor, color coding of litz wires to DIN 44081. For 3 PTC in series triplet sensors, color coding of litz wires to DIN 44082, connecting wires in yellow.

PTC Thermistors Limit Temperature Sensors for Motor protection Operating Principle

The PTC thermistor sensor is mounted in thermal contact with the equipment to be protected, and connected into the bridge arm of a comparator circuit, such as shown in Fig.1. At normal temperature, the PTC thermistor resistance (Rp) is lower than Rs (see Fig.2), so the comparator's output voltage VO will be low. If an equipment over temperature occurs, the PTC thermistor sensor will quickly heat up to its trigger or nominal reference temperature Tn, whereupon its resistance will increase to a value much higher than Rs, causing VO to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit.

PTC thermistor in bridge arm of a comparator circuit

Fig.1 PTC Thermistor connected into the bridge arm of a comparator circuit

PTC thermistor switch characteristic

Fig.2 PTC thermistor switch characteristic

Motor temperautre protection using PTC thermistors
Fig.3 Electric Motor Temperature Protection Using PTC Thermistors Sensors
As soon as one or more of the windings becomes too hot, the motor is switched off.

PTC Thermistors Limit Temperature Sensor for Motor protection Dimensional Drawing (Unit:mm)

PTC Thermistors Limit Temperature Sensor for Motor protection 1 PTC Single Sensor Dimension

PTC Thermistors Limit Temperature Sensor for Motor protection 1 PTC Single Sensor Dimension




PTC Thermistors Limit Temperature Sensor for Motor protection 3 PTC Triple Sensor Dimension

PTC Thermistors Limit Temperature Sensor for Motor protection 3 PTC triplet Sensor Dimension



AMWEI PTC Thermistors Limit Temperature Sensor for Motor protection General Data Sheet

Max. operating voltage Vmax 30V
Max. measuring voltage Vmeas,max 2.5V
Rated resistance (2.5V max) R25 °‹100 ohm
Insulating test voltage Vins 2.5kV
Ts trip time t °‹5 Seconds
Ts Sensing temperature tolerance ¶§T °ņ5C
Max. Operating temperature range (V°‹Vmeas,max) Top 200C

AMWEI PTC Thermistors Limit Temperature Sensor for Motor protection 1 PTC Single Sensor Data Sheet

Sensing temperature
Tsense
£®Centigrade£©
Resistance @25C
R25
£®Ohm£©
Resistance
@ Tsense -5C
Rsense-5
£®Ohm£©
Resistance
@ Tsense +5C
Rsense+5
£®Ohm£©
Resistance
@ Tsense +15C
Rsense+15
£®Ohm£©
Wire color Part no.
90C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm Green/Green AMZ6-MT90C1
100C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm Red/Red AMZ6-MT100C1
110C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm Brown/Brown AMZ6-MT110C1
120C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm grey/grey AMZ6-MT120C1
130C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm blue/blue AMZ6-MT130C1
140C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm white/blue AMZ6-MT140C1
150C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm black/black AMZ6-MT150C1
160C °‹100 Ohm °‹550 Ohm °›1330 Ohm °›4k ohm Blue/Red AMZ6-MT160C1

AMWEI PTC Thermistors Limit Temperature Sensor for Motor protection 3 PTC Triple Sensor Data Sheet

Sensing temperature
Tsense
£®Centigrade£©
Resistance @25C
R25
£®Ohm£©
Resistance
@ Tsense -5C
Rsense-5
£®Ohm£©
Resistance
@ Tsense +5C
Rsense+5
£®Ohm£©
Resistance
@ Tsense +15C
Rsense+15
£®Ohm£©
Wire color Part no.
90C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm Green/Green AMZ6-MT90C3
100C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm Red/Red AMZ6-MT100C3
110C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm Brown/Brown AMZ6-MT110C3
120C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm grey/grey AMZ6-MT120C3
130C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm blue/blue AMZ6-MT130C3
140C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm white/blue AMZ6-MT140C3
150C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm black/black AMZ6-MT150C3
160C °‹300 Ohm °‹1650 Ohm °›3990 Ohm °›12k ohm Blue/Red AMZ6-MT160C3
Note: The Intermediate connection wire is in yellow color.

Read more: ‘PTC Thermistors for Motor Transformer Overload and Short Circuit Protection’ »


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