TM-125-50 Tyco Electronics, TM-125-50 Datasheet

TM-125-50

Manufacturer Part Number

TM-125-50

Description

Shunt

Manufacturer

Tyco Electronics

Series

TMr

Datasheet

1.TM-10-50.pdf (2 pages)

Specifications of TM-125-50

Current Rating

125A

Accuracy

Â± 0.25%

Sensing Element

Manganin

Shunt Voltage

50mV

Supply Current

125A

Lead Free Status / RoHS Status

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Features

Compact space-saving

design

Accuracy class 0.5

Insulated base mounting

USA Mil. spec MIL-S-61B

Temperature coefficient

0.002% per 1°C

High overload withstand

ABS American Bureau of

Shipping Approved

Shunts

Specification

Construction

Potential Leads

Installation

W e b : w w w . c r o m p t o n - i n s t r u m e n t s . c o m • E m a i l : c r o m p t o n . i n f o @ t y c o e l e c t r o n i c s . c o m

Ratings

model:

Accuracy class:

Output:

Temperature

Co-efficient:

Ambient

temperature:

Lightweight Shunts

870 Series

The end blocks are machined from solid

section, high conductivity brass. They each

carry two terminals, current connection is

made by either threaded studs or bolts

depending on the model, terminals for

potential lead connection are provided by

UNC screws with spring and plain washers.

The resistance elements are made from

manganin sheet for its low temperature co-

efficient and long term stability and strength,

hard soldered into slots in the end blocks.

The shunt is mounted on a high strength

black phenolic base with integral fixing holes.

The resistance of the leads from the potential

terminals must be taken into account when

the instrument is calibrated. Details of

standard lead lengths and resistances are

available on request.

871

872

873

0.5 (0.25 USA)

50mV (std)

75, 100 and 150mV

available

0.002% per °C overall

Calibrated for 20°C, they

can be used in ambient

range -20°C to +60°C

This lightweight range is specifically suitable for applications

where there are space and/or weight limitations in the

installation such as in portable equipment, compact

electronic instrumentation, mobile installations such as

tanks and aircraft etc.

In addition to ammeters, shunts can be used to measure

and/or monitor current in a wide range of measurement,

protection and control devices.

The 870 series lightweight shunts are manufactured to

comply with the U.S.A. military specification MIL - S161B.

Standard outputs give 50mV potential drop.

By careful design and choice of materials, it has been

possible to produce a high performance shunt which is

mechanically strong, light in weight and of extremely

compact dimensions with the ability to withstand high

overloads without damage and possessing long term

calibration stability.

10 - 150A

151 - 600A

601 - 1200A

Warning

Temperature Rise:

Maximum Load

Indicator:

The heat generated by the current is

dissipated by conduction through the busbar

or cable and by convection in the air. The

shunt temperature should not exceed 145°C.

Conductors must be of adequate cross

sectional area and contact surface clean and

level, with a thin coating of silican grease

applied to the contact surface area.

Ensure clamping bolts or nuts and washers

are sufficiently tight. Shunts above 100 amps

should be mounted with leaves vertical and

longitudinal axis horizontal. Where this is

impractical, forced-air cooling may be

necessary to limit the temperature to 145°C.

Shunts are not fully insulated and protection

against accidental contact may be necessary

in order to comply with Health and Safety

regulations.

A momentary rise up to

200°C will not affect the

performance of these

shunts. When mounted as

recommended in freely

circulating air the

temperature rise should not

exceed 100°C.

20mA

The 870 series is designed

to comply with U.S. military

specification MIL-S-61B.

Its performance meets all

requirements including

those covering dielectric

withstanding voltage,

voltage drop, sustained

load, overload

2 0 0 2

Related parts for TM-125-50

TM-125-50 Summary of contents

Page 1

Features Compact space-saving design Accuracy class 0.5 Insulated base mounting USA Mil. spec MIL-S-61B Temperature coefficient 0.002% per 1°C High overload withstand ABS American Bureau of Shipping Approved Shunts Lightweight Shunts 870 Series This lightweight range is specifically suitable for ...

Page 2

Lightweight Shunts 870 Series Dimensions Model 871 Dimensions are in millimetres. 1mm = 0.0394 inches Shunts ...

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