Product Overview

YGM Motor Protectors PTC (Positive Temperature Coefficient) Thermistors are designed as thermal protectors for electrical motors. They offer rapid response protection for electrical machines and are compact for easy assembly into windings. These PTC thermistors feature a non-linear resistance/temperature response, rapidly increasing resistance to a very high value at a specified temperature, acting as a fail-safe mechanism. They are suitable for monitoring motor windings and for use in simple fail-safe circuitry, effectively switching off the circuit via a relay or amplifier when a critical temperature is exceeded. Available with or without an insulated sleeve and flexible connecting leads, they are manufactured by YGM.

Product Attributes

• Brand: YGM
• Type: PTC (Positive Temperature Coefficient) Thermistors
• Features: Rapid response protection, Compact size, Silvered copper leads, Non-linear resistance/temperature response
• Availability: With or without insulated sleeve, Flexible connecting leads
• Conductors: Silvered copper wire with Teflon insulation (PTFE)
• Conductor cross-section: 0.25 mm (for single, double, and triple PTCs)

Technical Specifications

Model	Type	Response Temp. NAT (C)	Tolerance (C)	Colour Code	Nominal Response Temperature Range (C)	Max. Allowable Operating Temp. (Tmax) (C)	Max. Allowable Operating Voltage (Umax) at +25C (V per bead)	Max. Allowable Power Dissipation at +25C (mW)	Insulation Strength (kV)	Conductor Lengths
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	80	5	white - white	80 to 180 in steps of 10, plus 145 and 155C	200	25	690	2.5	500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	90	5	green - green						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	100	5	red - red						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	110	5	brown - brown						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	120	5	grey - grey						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	130	5	blue - blue						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	140	5	white - blue						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	145	5	white - black						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	150	5	black - black						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	155	5	blue - black						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	160	5	blue - red						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	170	5	white - green						500 mm 10 mm
YGM1	Single Thermistor with shrunk-sleeve & epoxy seal	180	5	red - white						500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	80	5	white - yellow - yellow - white						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	90	5	green - yellow - yellow - green	80 to 180 in steps of 10, plus 145 and 155C	200	25 (per bead)	690	2.5	500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	100	5	red - yellow - yellow - red						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	110	5	brown - yellow - yellow - brown						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	120	5	grey - yellow - yellow - grey						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	130	5	blue - yellow - yellow - blue						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	140	5	white - yellow - yellow - blue						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	145	5	white - yellow - yellow - black						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	150	5	black - yellow - yellow - black						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	155	5	blue - yellow - yellow - black						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	160	5	blue - yellow - yellow - red						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	170	5	white - yellow - yellow - green						500 - 180 - 180 - 500 mm 10 mm
YGM3	Triple Thermistor with shrunk-sleeve & epoxy seal	180	5	red - yellow - yellow - white						500 - 180 - 180 - 500 mm 10 mm
CEF1	Mount-on Sensor in isolated brass/aluminium housing	80	5	white - white						80 to 180 in steps of 10, plus 145 and 155C	200	25 (per bead)	690	2.5	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	90	5	green - green	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	100	5	red - red	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	110	5	brown - brown	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	120	5	grey - grey	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	130	5	blue - blue	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	140	5	white - blue	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	145	5	white - black	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	150	5	black - black	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	155	5	blue - black	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	160	5	blue - red	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	170	5	white - green	Not Specified
CEF1	Mount-on Sensor in isolated brass/aluminium housing	180	5	red - white	Not Specified
Standard Resistance Values (per bead)
Condition	Temperature (C)	Resistance (Ohms)			Measuring Voltage (V)	Notes
Cold (approx. -20 to -5)	-20 to NAT - 20	max. 250 (Single PTC) / max. 750 (Triple PTC)			2.5 (Single PTC) / 7.5 (Triple PTC)	Resistance when cold is not an indication of PTC condition. Ideally between 40 - 200 ohms, can be 35 - 250 ohms.
Cold (approx. -5 to 0)	NAT - 5	max. 550 (Single PTC) / max. 1650 (Triple PTC)			2.5 (Single PTC) / 7.5 (Triple PTC)
At NAT	NAT	1000 (Single PTC) / 4000 (Triple PTC)			2.5 (Single PTC) / 7.5 (Triple PTC)
Hot (approx. +5 to +15)	NAT + 5	min. 1330 (Single PTC) / min. 4000 (Triple PTC)			2.5 (Single PTC) / 7.5 (Triple PTC)
Hot (approx. +15)	NAT + 15	min. 4000 (Single PTC) / min. 4000 (Triple PTC)*			7.5 (Single PTC) / 7.5 (Triple PTC)	*One PTC might reach NAT + 15 C, while others may still be at room temperature.
Quality Standard
PTC thermistor resistance values for motor protection are specified in DIN 44081/44082. Random testing is carried out according to DGQ P90/P10 (DIN 40080). AQL values can be fixed by arrangement.
Insulation Stripping
Approx. 10 mm

Ordering Information Example: Quantity Type Temp. code No. Resistance max.

1.000 YGM1 C 510 250 ohms

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 air movement.
• Air inflow onto the temperature sensor can interfere with heat transfer.
• If using varnish/lacquer which is not chemically neutral, suitability tests must be undertaken by the customer.
• WARNING! Install the sensor parallel with the copper of the winding so that the Teflon leads can assume the form of the winding, thereby retaining the high-voltage resistance rating.

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