242 / 336
12/16
Total Solution to Earthing & Lightning Protection |
9AKK106354A3360
12
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
0
to protect against flashover
(typically the service entrance location) through to LPZ 3 to protect sensitive
electronic equipment (e.g. transmitters, monitors, controllers).
Data & signal protection
ESP SL LED 4-20 mA Series
Installation
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.
Accessories
ESP SL30L/4-20/M
Module replacement
ESP SL/B
Base replacement
Full product range order codes can be found on pages 17/8-17/9
1
S
2
3
S
4
LightningBarrier
From line
LINE
CLEAN
Earth
To equipment
Furse
WilfordRoad,
Nottingham,
NG21EB,UK
Clean
Line
Nominal voltage
Maxworking voltage,U
c
Current rating
In-line resistance
Max surge current
Let-through voltage,U
p
30V
36.7V
750mA
1.0
Ω
20kA
63V
From line
To equipment
LINE
CLEAN
Earth
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.
Features & benefits
–– Very low let-through voltage (enhanced protection to
IEC/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
Application
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.
NOTE:
The ESP SL ‘Slim Line’ Series is also available for protection of systems up to 110 V as well as 3-wire, RS 485, RTD & telecommunication applications
(ESP SL/3W, ESP SL RS485, ESP SL RTD & ESP SL TN). The ESP SL X Series has approvals for use in hazardous areas.