3020-01101-0【PDF 1/4 页】SHUNT CURRENT DC 200A/50MV

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www.murata-ps.com

DMS Accessories

50mV and 100mV Base-mounted DC Shunts

Murata Power Solutions’ 50mV and 100mV base-mounted current shunts

are designed for measuring dc currents from 5A to 1200A. These preci-

sion shunts (+/–0.25% accuracy) connect directly to MPS’s DCA5-20PC

Series of dc ammeters. Installation is straightforward: simply connect the

load circuit to the shunt’s threaded studs and the shunt’s mV Kelvin-

outputs to the digital ammeter’s input terminals.

All models feature a rugged phenolic base that provides 750V isolation

to the shunt’s brass terminals, allowing for direct attachment to metal

surfaces. A highly stable (+/–15ppm/°C) manganin sensing-element

provides a wide –40 to +60°C operating temperature range. Please see

the DCA5-20PC data sheet for additional ammeter-related information

and detailed connection diagrams.

General Speci?cations (All Models)

Rated Accuracy ±0.25% max.

To ensure that the manganin sensing element does not exceed 125°C

under worst case operating conditions, please read and follow the guide-

lines in the mounting and derating sections of this data sheet. Tighten

Sensing Element

Terminal Posts/Screws

Tightening Torgue

Current Rating

Operating Temperature

Manganin

Brass

See Mechanical Dimensions

See Selection Guide

–40 to + 60°C (–40 to +137°F)

all connections on the shunt per the torque speci?cations given in the

mechanical dimensions and selection guide on page 3. Please note, the

user is responsible for selecting the correct wire sizes (gauge) and wire

type for the given application.

2. Mounting Considerations: All shunts should be mounted with their resis-

tance blades in a vertical position to allow for natural convection cooling

(see Figure 1). Forced-air cooling must be provided when vertical mounting

Technical Notes

IMPORTANT! To ensure safe and reliable operation, dc shunts and all

associated equipment must be installed and serviced by quali?ed

technical personnel. Never make any connections to the shunt, the

load, or the ammeter with energized power sources. Contact Murata

Power Solutions if you have any questions regarding the installation

or operation of any of our instruments and accessories.

1. Base-Mounted Shunt Precautions: DC current shunts are low value

resistors that develop a mV output when current passes through their

highly-stable manganin resistive element. Under high current, contin-

uous use operation, dc shunts will dissipate considerable power and

may undergo a signi?cant temperature rise. For example, if allowed

to operate continuously at its full rated load, a 500A/50mV shunt

dissipates 25 Watts (500A x 0.050V = 25 Watts). Therefore, whenever

possible, be sure to specify 50mV shunts due to their inherently lower

power dissipation and voltage drop.

is impractical, or in installations where the shunt is installed in a con?ned

location. The shunt’s manganin blades must never be allowed to exceed

+125°C; doing so will cause permanent damage to the shunt.

Shunts must be installed in a manner that protects them from damage due

to thermal expansion forces produced by high- or short-circuit currents. In

most cases, shunts are weaker than their external-circuit connections, so

provisions for additional wiring-?exibility may be required in high current

and/or high-vibration applications.

Whenever practical, all shunts should be connected in the grounded side

(normally the ‘chassis’) of the dc supply. However, these shunts must be

connected in the grounded side of the circuit when the dc supply exceeds

750 volts (the rated limit for the shunt’s phenolic insulating base). When

more than one wire is to be connected to each end of a shunt, the wires

must be evenly distributed between both terminals (see Figure 1).

Mount shunt on a vertical surface

50A

50mV

LOAD

CURRENT

50mV

OUTPUT

For full details go to

www.murata-ps.com/rohs

Figure 1. Typical installation

www.murata-ps.com/support

MPM_DMS Accessories.C01 Page 1 of 4

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