Ptc Thermistors

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Preferred Buyer Location All over the world

Complete Protection from burning of winding Thermo System Thermistors are manufactured in accordance with DIN 44081 and 44082. In three phase motors, one Thermistor should be....

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Thermo Systems Pvt Ltd.

Goregaon, Mumbai, Maharashtra

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Member Since 16 Years
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Complete Protection from burning of winding

Thermo System Thermistors are manufactured in accordance with DIN 44081 and 44082. In three phase motors, one Thermistor should be embedded in each phase. Good thermal coupling between Thermistor and winding is essential. The resistance increases sharply in the region of the nominal response temperature. Because the PTC assemblies are very small and rugged, they can be located in compact locations where protection is needed, such as directly inside the motor windings and can withstand standard varnish dip and bake operations and other handling. Response times ≤ 5 sec. are achieved with THERMO SYSTEM Thermistor.

Features:

	Provides economical and reliable protection for 3-phase motors
	Wide range available: 60°C to 190°C switching temperature
	Available in compact size for easy assembly into windings
	Rapid response protection for electrical machines
	Long hysteresis free switch cycle life. Steep temperature-resistance curve characteristic allows for
	simple evaluation electronics.

Resistance-temperature diagram and main characteristics in accrodance to DIN 44081/44082

Thermo System motor protection sensors conform to DIN 44081 or 44082 and are characterised by very high temperature sensitivity. In the range of the nominal alternating temperature the resistance increases sharply. This change can be used by a relay to disconnect the load circuit. Electronic evaluation circuits in widely varying applications are also possible. The resistance temperature diagram shows the typical characteristics of the Thermo System PTC. Load must not be applied to the thermistors as this creates a self-heating effect.

At ambient temperature the resistance value of thermistors is normally between 30 and 250 Ω. At ambient temperature the resistance values have no relevance to the serviceability (functionality) at the ROT (rated operating temperature).The ROT of PTC-thermistors in the range of +60°C to +190°C progresses normally in steps of 10 K.

Max. Working Voltage	Vmax	25	25	Volts
Rated Temperature	Tk	60--190	60--190	Deg.c
Tolerance Temperature	Tk	±5	±5	Deg.c
Repeatability	T	±0.5	±0.5	Deg.c
Nominal Resistance @ 25 Deg.C.	R25	≤100	≤300	0hms
Trip Resistance below Nominal	Tκ - 5Deg.c	≤1650	≤550	0hms
Trip Resistance above Nominal	Tκ+ 5Deg.c	≥3990	≥1330	0hms
Trip Resistance will above Nominal	Tκ + 15Deg.c	≥12	≥4	KΩ
Reaction Time	tD	<5	<5	Secs
Insulation	V	2.5	2.5	kv
Maximum Storage Temperature	TLmax	160	160	Deg.c
Minimum Storage Temperature	TLmin	-25	-25	Deg.c
Colour	See Table Below
Weight	Wt	2	3.5	g

Colour Coding For Different Temperature Ratings

Trip Temp	60	70	80	90	100	105	110	115	120	125	130
I st Colour	White	White	White	Green	Red	Blue	Brown	Blue	Grey	Red	Blue
IInd Colour	Grey	Brown	White	Green	Red	Grey	Brown	Green	Grey	Green	Blue
Trip Temp	135	140	145	150	155	160	165	170	180	190
1st Colour	Red	White	White	Black	Blue	Blue	Blue	White	White	Orange
Last Colour	Black	Blue	Black	Black	Black	Red	Brown	Green	Red	Black