Electrical Connections

All electrical connections should meet national and local

electrical codes and standards.

The controller should be located or so protected that they will

not be damaged by water escaping from pumps or pump

connections.

Prior to starting, verify the AC line voltage on the nameplate

matches the supply voltage onsite. Also verify the motor FLA

matches the information on the nameplate.

Inspect all electrical connections, components and wiring for

any visible damage and correct as necessary. Ensure that all

electrical connections are tightened before energization.

Install necessary conduit using proper methods and tools.

Incoming AC line voltage is clearly marked L1. L2. L3 and

ground, located at the top of the motor circuit protector.

The Crouse-Hinds series MTL4850 SIL3 HART multiplexer delivers a compact,

high-performance solution for both retrofit and new project installations in

industrial automation. Its small footprint makes it ideal for space-constrained

environments, while its modular design supports flexible integration with a

wide range of instrumentation applications.

The MTL4850 interfaces seamlessly via termination boards, carriers, and

integrated backplanes, enabling efficient connectivity to smart field devices

and HART-enabled instruments. It is SIL3 rated, making it suitable for functional

safety applications and safety-related systems without disrupting analog signal

integrity.

Approved to the latest IEC61508 standards, the MTL4850 is the preferred choice

for process control, diagnostics, and instrument management in sectors such as

oil & gas, chemical processing, and pharmaceutical manufacturing.

Its robust design and proven reliability make it a trusted component in intrinsically

safe and hazardous area installations.

Certifications and compliances

• Zone 2 (mounting)

• Division 2 (mounting)

• ATEX and IECEx

• CSA, FM and FMC

• Certified for use with safety related sub-systems to IEC61508

• SIL3 certified

• Operating temperature range: -40°C to +70°C

• Non-operating temperature range: -40°C to +85°C

Design features of our SIL3 rated HART multiplexer for process safety

• The module has a compact self-contained structure which enables optimized

and repeatable performance due to fixed capacity, 32 channels, per module

• Channel-to-channel isolation

• Isolated power supply

• Auto baud-rate detection

• LED indication for fault diagnosis

• Supports HART Rev. 5-7 devices

• SIL3 certified for connection to safety loop

• Onboard event log

• ATEX, FM and CSA certification

Features, benefi ts, and functions

• Complete motor protection and control in a single compact case

reduces panel space requirements and wiring costs

• Microprocessor design with self diagnostics eliminates calibration

and reduces installation, commissioning, and maintenance

• Programmable stop 2–20% of PCT

• Intel-I-Trip overload protection develops customized curve from

manufacturer’s supplied motor data

• Intel-I-Trip overload protection provides adaptive trip characteris

tics based on motor temperature when motor RTDs are

connected through an optional URTD module

• Meets UL 1053 ground fault protection standards that eliminates

the need for a separate ground relay saving cost, space, wiring,

and time

• Voltage dip/loss ride through capability reduces unnecessary trips

caused by poor power quality

• Motor currents, temperatures, and conditions are monitored and

displayed either locally or remotely

• Event log provides motor operating records for the most recent

20 trip or alarm events with date and time stamping. This

information can improve troubleshooting and reduce downtime

• Log book records the most recent 100 events such as motor

START/STOP and set point changes to provide a log of motor

operation with date and time stamping

• RTD diagnostics reduce unnecessary tripping caused by faulty

RTD, RTD wiring, or communications

• Arm/disarm feature improves security for critical

motor applications

• Motor start profile verifies protection and motor starting

coordination. This feature can be used to develop protection

settings on old motors where data is not available

• Optional communication module and Eaton’s Cutler-Hammer

software simplifies setting, configuration, monitoring, commis

sioning, and data retrieval either locally or remotely

• Optional quick release drawout case construction simplifies relay

removal and replacement

The MTL4854 mounts on the same range of backplane as

the MTL4850 but includes four HART modems that enable

simultaneous communications with connected field devices to

be carried out.

The primary application for this is to enable monitoring of other

channels to continue while one channel is being used for valve

positioner diagnostics.

The benefits of utilising these powerful software packages online

include:

• Reduced commissioning time and costs

• Reduced maintenance costs

• Reduced documentation

• Reduced process downtime

The MTL4850/54 offers connectivity to a comprehensive range

of FDT based software packages via the comms Device Type

Manager (DTM). The DTM can be downloaded from

www.mtl-inst.com. Other software packages work with the

MTL4850/54 through custom software drivers or by the inclusion

of the device description (DD) file for the MTL multiplexers.

Connectivity to HART Configuration and Instrument

Management Software

The online access to the information contained within HART

devices allows users to diagnose field device troubles before they

lead to costly problems. Software can capture and use diagnostic

data from HART field instruments via the MTL HART connection

hardware. This allows users to realise the full potential of their

field devices to optimise plant assets, which results in significant

operations improvement and direct maintenance savings.

IMS products provide essential configuration, calibration,

monitoring and maintenance history functions for conventional

analogue (4-20 mA) and HART protocol compatible smart process

instruments and field devices. They deliver powerful tools to meet

the need for standardised instrument maintenance procedures

and record keeping mandated by some quality standards and

regulatory bodies.

The MTL4850 HART multiplexer provides a simple interface

between smart devices in the field, control/safety systems and

HART® instrument management software running on a PC.

The system is based on 32-channel modularity to provide a

compact, easily configurable and expandable system. Using a

standard RS485 serial link, up to 2016 individual HART devices can

be connected to a single network.

For the optimum solution, the modules mount directly to either a

range of generic or customised connection units/backplanes.

The MTL4850 is certified for the use with safety related sub

systems to IEC 61508. and is the first choice of HART multiplexer

for these applications. It can be connected to signal loops that

are part of safety instrumented functions up to SIL3.

With the fixed modularity of 32 channels, the speed of scanning

field devices and responsiveness to PC software requests is

optimised when compared to master/slave configurations.

The MTL4854 mounts on the same range of backplane as

the MTL4850 but includes four HART modems that enable

simultaneous communications with connected field devices to

be carried out.

• Mount directly to a range of customised connection units

• MTL4850 designed for use with SIL3 loops (non interfering)

• MTL4854 designed for use in partial-stroke test valve

positioner applications

• Connect over 2000 loops on one RS485 network

• Auto baud rate detection

• LED indication for fault diagnosis

• Isolated Power Supply

• Firmware upgradeable

For the optimum solution, the modules mount directly to either a

range of generic or customised connection units/backplanes.

The MTL4850 is certified for the use with safety related sub

systems to IEC 61508. and is the first choice of HART multiplexer

for these applications. It can be connected to signal loops that

are part of safety instrumented functions up to SIL3.

With the fixed modularity of 32 channels, the speed of scanning

field devices and responsiveness to PC software requests is

optimised when compared to master/slave configurations.

The 4850-TR HART multiplexer provides a simple interface between

smart devices in the field; Triconex safety systems and FDT based

HART® instrument management software running on a PC.

The system is based on 32-channel modularity to provide a compact,

easily configurable and expandable system. Using a standard RS485

serial link, up to 992 individual HART® devices can be connected to a

single network.

The benefits of utilising these powerful software packages online

include:

• Reduced commissioning time and costs

• Reduced maintenance costs

• Reduced documentation

• Reduced process downtime

The 4850-TR will offer connectivity to a comprehensive range of FDT

based software packages via the 4850-TR Device Type Manager (DTM). 

• Designed to mount directly to Tricon Interface

cards and Trident backplanes

• Designed for use in SIL3 loops (non interfering)

• Connect up to 992 loops on one RS485 network

• Auto baud rate detection

• Automatic addressing for Tricon and Trident systems

• LED indication for fault diagnosis

• Isolated Power Supply

• Firmware upgradeable

• Onboard Diagnostics

• Alarm output

The 4850-TR HART multiplexer provides a simple interface between

smart devices in the field; Triconex safety systems and FDT based

HART® instrument management software running on a PC.

The system is based on 32-channel modularity to provide a compact,

easily configurable and expandable system. Using a standard RS485

serial link, up to 992 individual HART® devices can be connected to a

single network.

For the optimum solution, the 4850-TR mounts directly to either

the Tricon (Interface) card or the Trident backplanes via a 100-way

connector.

Connectivity to HART Configuration and Asset Management

Software

The online access to the information contained within HART devices

allows users to diagnose field device troubles before they lead to costly

problems. Software such as PACTWARE can capture and use diagnostic

data from HART field instruments via the MTL HART connection

hardware. This allows users to realise the full potential of their field

devices to optimise plant assets, which results in significant operations

improvement and direct maintenance savings.IMS products provide

essential configuration, calibration,

monitoring and maintenance history functions for conventional analog

(4-20 mA) and HART protocol compatible smart process instruments

and field devices. They deliver powerful tools to meet the need for

standardised instrument maintenance procedures and record keeping

mandated by some quality standards and regulatory bodies.