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ESP SL LED 4-20 mA Series NEW
TSC-0912 - 09.10.12
Features and benefits
Combined Category D, C, B tested protector (to BS EN 61643)
suitable for twisted pair 4-20 mA loop systems with innovative LED
protector status indication. For use at boundaries up to LPZ 0B to
protect against flashover (typically the service entrance location)
through to LPZ 3 to protect sensitive electronic equipment (e.g.
transmitters, monitors, controllers).
Connect in series with the 4-20 mA
current loop either near where it
enters or leaves the building or
close to the equipment being
protected (e.g. within its control
panel). Either way, it must be
very close to the system’s earth
star point.
Install protectors either within an
existing cabinet/cubicle or in a
separate enclosure.
Installation
Use these protectors on 4-20 mA
loop systems - ideal where
installation space is at a premium
and large numbers of lines require
protection, or for systems with
long signal lines.
Application
Technical note
4-20 mA current loops can serve multiple devices over a long distance. The devices and wiring produce a voltage
drop (also known as “loop drops”) but these do not reduce the 4-20 mA current as long as the power supply
voltage is greater than the sum of the voltage drops around the loop at the maximum signalling current of 20 mA.
For design considerations, each ESP SL30L/4-20 device installed within the loop introduces a 1.7 V loop drop.
Very low let-through voltage (enhanced protection to BS EN 62305)
between all lines - Full Mode protection
Full mode design capable of handling partial lightning currents as
well as allowing continual operation of protected equipment
Repeated protection in lightning intense environments
Innovative LED indication of protection status provides easy visual
checking and quick maintenance
Ultra slim 7 mm width ideal for compact protection of large numbers
of lines (e.g. process control installations)
Two stage removable protection module with simple quick release
mechanism allowing partial removal for easy line commissioning and
maintenance as well as full removal for protection replacement
Very low (1 Ω) in-line resistance for minimal system interference
High (75 mA) maximum running current - can also be used on 10-50 mA
systems (e.g. process control)
Screen terminal enables easy connection of cable screen to earth
Strong, flame retardant, polycarbonate housing
Built-in innovative DIN rail foot with locking feature for simple
positioning and clip-on mounting to top hat DIN rails
4 mm 2 terminals allow for larger cross section wiring, stranded wires
terminated with ferrules or fitting two wires into a single terminal
Convenient earthing through DIN foot and/or earth terminal
ESP SL30L/4-20/M
Module replacement
ESP SL/B
Base replacement
For suitable enclosures for the
ESP SL LED 4-20 mA Series, please
contact us.
Accessories