3-port isolation as standard
• Highest module/channel packing
densities
• Low power dissipation
• Quick install and release mechanism
• Multi-channel I/O modules

• Broken line and earth-fault protection

Isolation—protecting your system
Designing your plant with good clean
earth systems is not always possible. Poor
ground conductivity, large process areas and
heavy electrical machinery, all contribute to
increased noise. This noise is induced or
conducted into adjacent wiring, which in turn
degrades the quality of the signals passing
through the cables. Without isolation this
noise is superimposed on the process signal
causing a loss of accuracy, poor control and
possibly failures or false trips.
Many control systems, PLCs and safety
systems do not have full isolation between
channels. In compact well defined plant
layouts this is acceptable, but these are
not always guaranteed. To avoid interference
between channels, isolation is the solution.
The MTL4600 series isolators offer reduced
risk and greater protection to the system,
with all the advantages of a common design
approach for both IS and non-IS signals.

System Solutions
Building on the base of the MTL4500
series solutions, the MTL4600 offers a high
level of signal isolation for installations where
multiple loops on a common connection are
not desirable.
Signal isolation provides excellent
protection against surges, common faults
and noisy environments. It also eliminates
the risk of earth loops between different
areas of the plant, which, if not isolated, can
cause significant errors or failures under fault
conditions.
MTL4600 isolators are fully compatible with
all existing backplanes used with MTL4500
series and many control systems. The form
factor and signal types offer the user a
common approach for both IS and non-IS
signals.
The backplane mounting MTL4600 Series
is designed with system vendors in mind
for "project-focussed" applications such as
Distributed Control System (DCS), Emergency
Shutdown Systems (ESD) and Fire and Gas
monitoring (F&G).

ISOLATOR FUNCTION SELECTOR
Channels Function
Digital Input
MTL4604


1 switch/prox input, phase reversal + LFD
MTL4610 4 switch/prox input, solid-state output
MTL4611 1 switch/prox input, c/o relay output
MTL4613 2 switch/prox input, solid-state output
MTL4614 1 switch/prox input, relay + LFD
MTL4616 2 switch/prox input, relay + LFD outputs
MTL4617 2 switch/prox input, relay + LFD outputs
Digital Output
MTL4621 1 loop powered solenoid driver
MTL4623 1 solenoid driver with LFD
MTL4623L 1 loop powered solenoid driver with LFD
MTL4623R 1 solenoid driver with reverse LFD
MTL4624 1 switch operated solenoid driver
MTL4624S 1 switch operated solenoid driver, 24V override
MTL4626 2 switch operated relay
Pulse Output
MTL4632 1 pulse isolator, digital or analogue output
Analogue Input
MTL4641 1 2/3 wire transmitter repeater
MTL4641A 1 transmitter repeater, passive input
MTL4641AS 1 transmitter repeater, passive input, current sink
MTL4641S 1 2/3 wire transmitter repeater, current sink
MTL4644 2 2/3 wire transmitter repeater
MTL4644A 2 transmitter repeater, passive input
MTL4644AS 2 transmitter repeater, passive input, current sink
MTL4644S 2 2/3 wire transmitter repeater, current sink
MTL4644D 1 2/3 wire transmitter repeater, dual output
Analogue Output
MTL4646 1 4-20mA smart isolating driver + LFD
MTL4646Y 1 4-20mA smart isolating driver + oc LFD
MTL4649 2 4-20mA smart isolating driver + LFD
MTL4649Y 2 4-20mA smart isolating driver + oc LFD
Temperature Input
MTL4675 1 temperature converter, THC or RTD
MTL4676-RTD 2 temperature converter, RTD
MTL4676-THC 2 temperature converter, THC