Product Overview

YGM Motor Protectors PTC (Positive Temperature Coefficient) Thermistors are designed for rapid response thermal protection of electrical machines. They act as thermal protectors for electrical motors, featuring a non-linear resistance/temperature response where resistance rapidly increases to a very high value at a specified temperature. Available with or without an insulated sleeve and with flexible connecting leads, these compact PTC thermistors are suitable for easy assembly into windings. They are particularly suited for monitoring the windings of electric machines and for use in simple fail-safe circuitry. When a given temperature is exceeded, the PTC-sensor's extremely high ohmic value can switch off the circuit through a relay or amplifier, effectively acting as a circuit break or thermistor failure.

Product Attributes

• Brand: YGM
• Type: PTC (Positive Temperature Coefficient) Motor Protectors
• Construction Options: With or without insulated sleeve
• Connecting Leads: Flexible
• Lead Material: Silvered copper wire with teflon insulation (PTFE)
• Conductor Cross-section: 0.25 mm (for single, double, and triple PTC's)
• Insulation Strength: 2.5 kV (between leads and outer insulation, also for threaded sensor)
• Origin: Canada (Division of Microtherm)

Technical Specifications

Model	Response Temp. NAT (C)	Tolerance (C)	Colour Code	Max. Allowable Operating Temp. (Tmax) (C)	Max. Allowable Operating Voltage (Umax) at +25C (V per bead)	Max. Allowable Power Dissipation at +25C (mW)	Conductor Length (mm)
YGM1	80	5	white - white	200	25	690	500 10
YGM1	90	5	green - green				500 10
YGM1	100	5	red - red				500 10
YGM1	110	5	brown - brown				500 10
YGM1	120	5	grey - grey				500 10
YGM1	130	5	blue - blue				500 10
YGM1	140	5	white - blue				500 10
YGM1	145	5	white - black				500 10
YGM1	150	5	black - black				500 10
YGM1	155	5	blue - black				500 10
YGM1	160	5	blue - red				500 10
YGM1	170	5	white - green				500 10
YGM1	180	5	red - white				500 10
YGM3	80	5	white - yellow - yellow - white				500 - 180 - 180 - 500 10
YGM3	90	5	green - yellow - yellow - green	200	25	690	500 - 180 - 180 - 500 10
YGM3	100	5	red - yellow - yellow - red				500 - 180 - 180 - 500 10
YGM3	110	5	brown - yellow - yellow - brown				500 - 180 - 180 - 500 10
YGM3	120	5	grey - yellow - yellow - grey				500 - 180 - 180 - 500 10
YGM3	130	5	blue - yellow - yellow - blue				500 - 180 - 180 - 500 10
YGM3	140	5	white - yellow - yellow - blue				500 - 180 - 180 - 500 10
YGM3	145	5	white - yellow - yellow - black				500 - 180 - 180 - 500 10
YGM3	150	5	black - yellow - yellow - black				500 - 180 - 180 - 500 10
YGM3	155	5	blue - yellow - yellow - black				500 - 180 - 180 - 500 10
YGM3	160	5	blue - yellow - yellow - red				500 - 180 - 180 - 500 10
YGM3	170	5	white - yellow - yellow - green				500 - 180 - 180 - 500 10
YGM3	180	5	red - yellow - yellow - white				500 - 180 - 180 - 500 10
CEF1	80	5	white - white				200	25	690	Special versions available
CEF1	90	5	green - green	Special versions available
CEF1	100	5	red - red	Special versions available
CEF1	110	5	brown - brown	Special versions available
CEF1	120	5	grey - grey	Special versions available
CEF1	130	5	blue - blue	Special versions available
CEF1	140	5	white - blue	Special versions available
CEF1	145	5	white - black	Special versions available
CEF1	150	5	black - black	Special versions available
CEF1	155	5	blue - black	Special versions available
CEF1	160	5	blue - red	Special versions available
CEF1	170	5	white - green	Special versions available
CEF1	180	5	red - white	Special versions available

Specification	Value
Nominal Response Temperature Range	80 C to 180 C in 10 C steps, plus 145 C and 155 C
Resistance Values (Cold)	Ideally 40 - 200 ohms, can be between 35 - 250 ohms
Resistance Change	At least 15%/K between 5 C of NAT
Resistance Measuring Voltage (Single PTC)	2.5 V
Resistance Measuring Voltage (Triple PTC)	7.5 V
Quality Standard	DIN 44081/44082 for PTC resistance values for motor protection
Testing	Random testing according to DGQ P90/P10 (DIN 40080)
Insulation Stripping	Approx. 10 mm
Special Housings	Available, can be manufactured to customer specifications

Installation Tips for PTC Temperature Sensors in Electrical Windings:

• Thermistors can only be inserted in the windings before impregnation.
• Embed one thermistor in each phase, ideally in the center of the coil generating most heat, and generally on the outflow side of any air movement.
• Air inflow onto the temperature sensor will interfere with heat transfer.
• For varnishes/lacquers that are not chemically neutral, suitability tests must be undertaken by the customer.
• WARNING! Install the sensor parallel with the copper of the winding to ensure teflon leads assume the form of the winding and retain high-voltage resistance rating.