Product Overview

YGM Motor Protectors PTC (Positive Temperature Coefficient) Thermistors are designed as thermal protectors for electrical motors, offering rapid response protection for electrical machines. They feature a compact size for easy assembly into windings and are available with or without an insulated sleeve, equipped with flexible connecting leads. These PTC thermistors exhibit a non-linear resistance/temperature response, rapidly increasing to a very high value at a specified temperature, effectively acting as a fail-safe mechanism. They are particularly suited for monitoring the windings of electric machines and for use in simple fail-safe circuitry, switching off the circuit through a relay or amplifier when a given temperature is exceeded.

Product Attributes

• Brand: YGM
• Type: PTC Thermistors
• Lead Material: Silvered copper wire with teflon insulation (PTFE)
• Conductor Cross-section: 0.25 mm (for single, double, and triple PTCs)
• Insulation Strength: 2.5 kV (between leads and outer insulation, also for threaded sensor)
• Origin: Canada (Division of Microtherm)

Technical Specifications

Type	Model	Response Temp. NAT (C)	Tolerance (C)	Colour Code	Nominal Response Temperature Range (C)	Maximum Allowable Operating Temp. Tmax (C)	Max. Allowable Operating Voltage Umax (V per bead) at +25C	Max. Allowable Power Dissipation (mW) at +25C
YGM3	C508	80	5	white - yellow - yellow - white	80 to 180 in steps of 10, plus 145 and 155C	200	25	690
YGM3	C509	90	5	green - yellow - yellow - green
YGM3	C510	100	5	red - yellow - yellow - red
YGM3	C511	110	5	brown - yellow - yellow - brown
YGM3	C512	120	5	grey - yellow - yellow - grey
YGM3	C513	130	5	blue - yellow - yellow - blue
YGM3	C514	140	5	white - yellow - yellow - blue
YGM3	C545	145	5	white - yellow - yellow - black
YGM3	C515	150	5	black - yellow - yellow - black
YGM3	C655	155	5	blue - yellow - yellow - black
YGM3	C516	160	5	blue - yellow - yellow - red
YGM3	C517	170	5	white - yellow - yellow - green
YGM3	C518	180	5	red - yellow - yellow - white
CEF1	C508	80	5	white - white
CEF1	C509	90	5	green - green	... (other CEF1 models follow similar pattern)
YGM1	C508	80	5	white - white	... (other YGM1 models follow similar pattern)

Characteristic	Value	Unit
Insulation Stripping	approx 10	mm
Conductor Length (Single PTC)	500 10	mm
Conductor Length (Triple PTC)	500 - 180 - 180 - 500 10	mm
Standard Resistance (Cold)	Ideally 40-250 (can be anywhere between 35-250)	ohms
Resistance Change Rate	at least 15%/K
Resistance Values (Single PTC) below NAT-20	Not specified
Resistance Values (Triple PTC) below NAT-20	Not specified
Quality Standard	DIN 44081/44082
Testing	Random testing according to DGQ P90/P10 (DIN 40080)

Standard Resistance Values

Type	Temperature (C)	Resistance ()	Measuring Voltage (V)
Single PTC	20 to NAT 20	max. 250 / 100 max.	2.5
	NAT 5	max. 550	2.5
	NAT	1.000	2.5
	NAT + 5 to NAT + 15	min. 1.330 / min. 4.000	2.5 / 7.5
Triple PTC	20 to NAT 20	max. 750 / 300 max.	7.5
	NAT 5	max. 1.650	7.5
	NAT to NAT + 15	min. 4.000	7.5