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5/116 ELECTRICAL INSTALL ATION SOLUTIONS FOR BUILDINGS 2CHC 420 001 C0201

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Protection and safety
Data & signal protection
OVR SL LED 4-20 mA Series

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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).

Features & benefits
• Very low let-through voltage (enhanced protection to • Very low (1 Ω) in-line resistance for minimal system
IEC/BS EN 62305) between all lines - Full Mode protection interference
• Full Mode design capable of handling partial lightning • High (75 mA) maximum running current - can also be used
currents as well as allowing continual operation of on 10-50 mA systems (e.g. process control)
protected equipment • Screen terminal enables easy connection of cable screen
• Repeated protection in lightning intense environments to earth
• Innovative LED indication of protection status provides • Strong, flame retardant, polycarbonate housing
easy visual checking and quick maintenance • Built-in innovative DIN rail foot with locking feature for
• Ultra slim 7 mm width ideal for compact protection of simple positioning and clip-on mounting to top hat DIN rails
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large numbers of lines (e.g. process control installations) • 4 mm terminals allow for larger cross section wiring,
• Two stage removable protection module with simple quick stranded wires terminated with ferrules or fitting two
release mechanism allowing partial removal for easy line wires into a single terminal
commissioning and maintenance as well as full removal for • Convenient earthing through DIN foot and/or earth
protection replacement terminal

Application Installation
Use these protectors on 4-20 mA loop systems - ideal where Connect in series with the 4-20 mA current loop either near
installation space is at a premium and large numbers of lines where it enters or leaves the building or close to the
require protection, or for systems with long signal lines. 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.

LINE CLEAN
CLEAN
LINE
Lightning Barrier
Nominal voltage 30V
Max working voltage, U c 36.7V
Accessories 1 Current rating 750mA 1.0Ω 20kA 63V 3
In-line resistance
Max surge current
Let-through voltage, U p
OVR SL30L/4-20/M Weatherproof enclosure: S Furse Wilford Road,
Nottingham,
NG2 1EB, UK
Module replacement OVR WBX SLQ S
OVR SL/B 2 4
Base replacement
From line To equipment
To equipment
From line
Earth
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 OVR SL30L/4-20 device installed within the loop introduces a 1.7 V loop drop.
NOTE: The OVR 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 (OVR SL/3W, OVR SL RS485, OVR SL RTD & OVR SL TN). The OVR SL X Series has approvals for use in hazardous areas.