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Electronic Systems Protection furse
ESP RTD Local protectors for three wire RTD applications

Suitable for three wire RTD installations.
Available for a working voltage of up to 6V.

For For two wire or 4-wire RTD applications, use one or two ESP 06D protectors respectively. For three wire RTD applications where multiple RTDs are being protected see the ESP RTDQ.

Application

Use on three wires to protect monitoring equipment in RTD systems.

Features and benefits

Protects all three wires on a 3-wire RTD system with a single protector.

Low let-through voltage between all lines.

Provides repeated protection in lightning intense environments.

Low in-line resitance minimises unecessary reductions in signal strength.

Strong, flame retardent, ABS housing.

Supplied ready for flat mounting on base or side.

Duilt-in DIN rail foot for simple clip-on mounting to top hat DIN rails.

ESP RTD Mounting
Protectors can be flat mounted via their base (left) or side, or mounted on top hat DIN rail (right) via an integral spring loaded DIN rail foot.

Colour coded terminals give a quick and easy installation check - grey for dirty (line) end and green for the clean end.

ESP RTD

Substantial earth stud for effective earthing.

Integral earthing plate enables enhanced connection to earth via a CME kit.

Installation

Connect in series with the signal line either near where it enters or leaves the building or close to the equipment being protected (eg within its control panel). Either way, it must be very close to the systems earth star point. The screen connection should be made via the earth stud. Install protectors either within an existing cabinet/cubicle or in a separate enclosure.

ESP RTD Installation

Suitable Accessories

Simultaneously mount and earth up to 4 of these protectors on a CME 4, up to 8 on a CME 8, up to 16 on a CME 16 or up to 32 on a CME 32. Details of the Combined Mounting and earthing kits can be found here.

Enclosures suitable for up to two (WBX 2/G) or three (WBX 3/G) protectors, or a CME 4 and its associated protectors (WBX 4), CME 8 and protectors (WBX 8) or two CME 16 kits and protectors (WBX 16/2/G) can be found here.

PDF

ESP RTD Brochure

Electrical Specification


ESP RTD
Nominal voltage
(note 1) 		6V
Maximum working voltage
(note 2) 		7.79V
Current rating (signal) 200mA
In-line resistance (per line +/-10%) 10ohms
Bandwidth (-3dB 50ohm system) 800kHz
1 Nominal voltage (DC or AC peak) measured at <200µA
2 Maximum working voltage (DC or AC peak) measured at <10mA

Transient Specification


ESP RTD
Let-through voltage - all conductors (note 1)
5kV, 10/700µs test to:
BS 6651:1999 Appendix C, Cat C-High
ITU (formely CCITT) IX K17 		10.5V
Maximum surge current (note 2)
per signal wire
per pair
10kA
20kA
1 The maximum transient voltage let-through the protector throughout the test (+/-10%) line to line and line to earth. Response time <10ns.
2 Tested with 8/20µs waveshape to ITU (formely CCITT), BS 6651:1999 Appendix C.

Mechanical Specification


ESP RTD
Temperature range -25°C to +70°C
Connection type Screw terminal
Earth connection M6 stud
Weight
unit
packaged (per 10)
0.08kg
0.85kg
Dimensions

Dimensions