Resistors

The Laet company has produced series of non-inductive power resistors with a compact housing type TO-247(resistor PA6) and the original case (RA7), designed to work in harsh conditions. The resistors are capable of working at a power of 20 to 500 watts.

The Laet resistors have nominal values ​​ from 1 ohm to 1 Mohm with a tolerance of 1% and temperature coefficient of resistance of less than 100rrm/0C. They can be placed immediately on the device or on the radiator (PA6, RA7) or executed without housing and without a heat sink (PA-8).This allows developers to use them in powerful electronic circuits that experience elevated temperatures during operation. Operating temperature range is from-50 C to  260 C.

Combining high performance with low temperature coefficient resistors are able to provide excellent vibration endurance. They are intended for use in a wide range of applications including power supplies, locking, starter, brake resistors, pulse generators, high-frequency amplifiers, and voltage dividers, etc.

Available resistors

RА 6

Nominal capacity

from 20 Watt to 300 Watt

The range nominal resistance

from 1 Ohm до 1 Mohm

Precision

1%, 5%, 10%

TCS

performance 1 - no more than 100 ppm

TCS

performance 2 - no more than 300 ppm

Electrical strength

no less than 2 kV at normal humidity, which is determined by 2 mm air gap between the findings of the resistor and the surface of the radiator.

Insulation resistance

more than 1012 Оhm.

Maximal working temperature

260 0С.

Nominal power is saved

to 60 0С of environment

Mass, g

4


RА 7

Nominal capacity

from 100 Watt. to 500 Watt.

The range nominal resistance

from 1 Оhm to 1 Mohm

Precision

1%, 5%, 10%

TCS

performance 1- no more 100 ppm

TCS

performance 2- no more 300 ppm

Electrical strength

no less 2 kV at normal humidity, which is determined by 2 mm air gap between the findings of the resistor and the surface of the radiator.

Insulation resistance

more than 1012 Оhm

Maximal working temperature

260 0С

Nominal power is saved

to 60 0С of environment

Mass, g

8

Sizes, mm



RА 8

Nominal capacity

to 20 Vt

The range nominal resistance

from 1000 Оhm  to 2 Mohm

Precision

1%, 5%, 10%

ТСS

performance 1- no more 100 ppm

ТСS

performance 2- no more 300 ppm

Electrical strength

to 100 kV

Working voltage

to 10 kV

Insulation resistance

More than 1012 Ohm

Maximal working temperature

280 0С.

Nominal power is saved

to 70 0С of environment

Mass, g

6

Sizes, mm


* To increase the electrical strength of RA6 and RA7, complete with a resistor seals can be supplied from the high-heat ceramic based on AlN (180 W / m K).


Radiator assembly.


Power of 500 watts.

The operating voltage of 2 kV.

The breakdown voltage of more than 5kV.

The resistance of 5.6 ohms. Weight 3.5 kg.

Used for electrical substations.


Radiator assembly with fan.

Power 500 W

The operating voltage 36 V.

The resistance of 4.0 ohms. Weight 1.7 kg.

Used for electric vehicles.



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