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Air Cooled Shunts

Type 4638

The type 4638 high current air cooled shunts cover the range 1.5 to 2,000 Amperes and were designed to comply with the E.S.M. Act.

Limit of Error

The type 4638 shunts having rated values up to 100 Amperes are calibrated to maintain resistance within 0.03% for any current up to full rated current. Between 100 and 2,000 Amperes they will keep within 0.05% for any current up to their full rating.

Stability

The stability of these shunts under steady current conditions is better than 0.01%. Their stability with time is of the same order.

Thermal Errors

Errors due to thermal E.M.F.s are less than 0.01% of the Volt drop with full rated current and under zero current conditions will be a few micro Volts only.

Construction

The shunts are constructed of high grade Manganin, the resistive elements being solidly soldered to the current terminals and the whole assembly is mounted on a strong base and fitted with a protecting cover which allows the convection currents to circulate freely and effect cooling.

For more information about this product contact Tinsley

Specifications

See the table below for a run-down of this product's specifications.

Current Amperes	Resistance Ohm	Volt Drop Volts	Wattage Watts	Dimensions Millimetres (approx.)
1.5	1.0	1.5	2.25	230 x 100 x 100
5	0.2	1.0	5	410 x 100 x 100
15	0.1	1.5	23	410 x 130 x 110
15	0.01	0.15	2.25	230 x 130 x 110
50	0.01	0.5	25	280 x 130 x 130
50	0.02	1.0	50	580 x 130 x 140
75	0.002	0.15	11	500 x 155 x 110
150	0.01	1.5	225	860 x 255 x 180
150	0.001	0.15	2.5	500 x 255 x 110
300	0.001	0.3	90	835 x 155 x 200
500	0.0002	0.1	50	410 x 155 x 155
750	0.0002	0.15	110	700 x 210 x 200
1000	0.0001	0.1	100	450 x 210 x 260
1500	0.0001	0.15	225	675 x 210 x 260
2000	0.00005	0.1	200	860 x 245 x 260

275 King Henry's Drive
New Addington
Croydon
CR0 0AE

Precision Instruments

Air Cooled Shunts

Type 4638

Limit of Error

Stability

Thermal Errors

Construction

Specifications

1.5

1.0

1.5

2.25

230 x 100 x 100

5

0.2

1.0

5

410 x 100 x 100

15

0.1

1.5

23

410 x 130 x 110

15

0.01

0.15

2.25

230 x 130 x 110

50

0.01

0.5

25

280 x 130 x 130

50

0.02

1.0

50

580 x 130 x 140

75

0.002

0.15

11

500 x 155 x 110

150

0.01

1.5

225

860 x 255 x 180

150

0.001

0.15

2.5

500 x 255 x 110

300

0.001

0.3

90

835 x 155 x 200

500

0.0002

0.1

50

410 x 155 x 155

750

0.0002

0.15

110

700 x 210 x 200

1000

0.0001

0.1

100

450 x 210 x 260

1500

0.0001

0.15

225

675 x 210 x 260

2000

0.00005