Rheostats

Description

Rheostats are mainly used for regulating electric current in industry and laboratory where these are used as adjustable resistors in electrical circuits. With three terminal provisions, these can be used to vary a D C potential smoothly from zero to maximum.

Toshniwal Rheostats consist of resistance wire wound on a former which is made from solid drawn hexagonal steel tube vitreous enameled, ensuring good mechanical strength and sturdiness. The tube is fitted in two end castings insulated with micanite cups.

The Brush gear slides on a highly polished square slide rod. The brush is of copper graphite with pigtail connections. Two heat resisting compression spring hold brush family in contact with the resistance wires. Copper graphite brush provides necessary lubrication to prevent wear and tear of wire even at elevated temperatures.

  • Industrial quality components.
  • Trouble-free long service.
  • Wide range of resistance values and current – carrying capacities.

Tolerance on resistance value

+20% to -5%

H.T. Test

2kV for 1 minute

Temperature rise

375ºC*

Maximum working voltage

500 V

Ambient Temperature

0-45ºC

 *The temperature rise above ambient temperature is with Rheostats mounted vertically in free air, with hotter end of the winding above the brush.

Type

Single Tube

Double Tube

Open

PL11.01

PL12.01

PL13.01

PL14.01

PL15.01

PL16.01

Protected

PL11.02

PL12.02

PL13.02

 

 

 

Back of Panel Mounting

PL11.03

PL12.03

PL13.03

 

 

 

TUBE SIZE (AF)

1 ½ "

2"

2 ½"

1 ½"

2"

2 ½"

LENGTH

6"

8"

12"

8"

12"

16"

16"

20"

6"

8"

12"

8"

12"

16"

16"

20"

AMPS *

OHMS

18

0.4

0.6

1

0.84

1.4

2

2.3

3

0.8

1.2

2

1.68

2.8

4

4.6

6

15

0.6

0.9

1.4

1.2

2

2.7

3.3

4.3

1.2

1.8

2.8

2.4

4

5.4

6.6

8.6

12

1.2

2

3

2.52

4.2

6

7

9

2.4

4

6

5

8.4

12

14

18

8.5

2.6

4

6.5

5.4

9

12

14

19

5.2

8

13

10.8

18

24

28

38

5.0

7.5

11

18

15

25

35

40

50

15

22

36

30

50

70

80

100

2.8

21

32

55

42

70

100

110

145

42

64

110

84

140

200

220

290

1.7

45

65

110

84

140

200

230

300

90

130

220

168

280

400

460

600

1.2

110

160

270

216

360

500

570

750

220

320

540

432

720

1000

1140

1500

0.6

260

400

650

510

850

1200

1350

1750

520

800

1300

1020

1700

2400

2700

3500

0.3

800

1230

2000

1650

2750

3900

4250

5500

1600

2460

4000

3300

5500

7800

8500

11000

*The above current ratings are continuous and are based on the tube being mounted vertically in free air are with the hot portion of the winding above the brush. Should it be necessary to mount the tubes horizontally, the current should be reduced to 75% of the rated value. Ohms values for double tube are with both tubes connected in series.

 Ordering Data: When placing order, please mention Cat. No. tube size & length in inches, current & ohms rating. Example: PL 12.01, 2” X 12”, 5A/25 Ohms.

The application of rheostats is in the field circuits of motors or generators for the control of speed or voltage, or in control circuits. The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.

Fields marked with * are mandatory fields.

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