Thomas & Betts furse ESP 120 D1, furse ESP 415 D1 Series, furse ESP 208 D1 Series, furse ESP 277 D1, furse ESP 240 D1 Installation Instructions Manual

Installation instructions

for mains wire-in protectors

ESP D1, D1R, D1/LCD and D1R/LCD variants

Installation instructions for mains wire-in protectors

Introduction

This document explains how to install Furse Electronic
Systems Protectors for mains power supplies:

Single phase ESP 120 D1 | Single phase ESP 240 D1 | Single
phase ESP 277 D1 | Three phase ESP 208 D1, D1R, D1/LCD
& D1R/LCD | Three phase ESP 415 D1, D1R, D1/LCD &
D1R/LCD | Three phase ESP 480 D1, D1R, D1/LCD & D1R/LCD

These instructions are prefaced by a summary of the
Key points of installation. Each key point is explained in
detail in the section entitled Installation.

WARNING: Incorrect installation will impair the

Contents

effectiveness of the ESP units

Key points of installation 3
Before installation 4
Installation 6
Installation check (LED units) 24
Neutral-earth warning light (LED units) 25
Status indication (LED units) 26
Status indication (LCD units) 26
LCD display settings 30
Remote indication 34
Maintenance 35
Application notes 36
Remote display cut-out template 39

Key points of installation

1

Install protectors very close to the power supply to be
protected, either within the distribution panel or directly
alongside it.

2

Mount units within a panel or WBX enclosure.

3

ESP D1 units can be installed in parallel or, for power
supplies ≤125A, in-line (series) with the power supply.

4

Connect to phase(s), neutral and earth.

NOTE: Units must have a neutral connection.

5

Units installed at power distribution boards can be
installed either:

on the load side of the incoming isolator, or

on the closest available outgoing way to the
incoming supply

6

Provide a means of isolation for the ESP unit.

7

The connecting leads to phase/live terminals should be
suitably fused (125A maximum) ensuring full
discrimination with the immediate upstream supply fuse.

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Installation instructions for mains wire-in protectors

8

Connecting leads should be 10 mm2multi stranded
cable for parallel/shunt installation. For series installation,

refer to section 6.

9

For parallel/shunt installation, keep the connecting leads as
short as possible and ideally less than 25 cm (10 inches) in
length. For series installation, keep earth lead as short as
possible.

This may be better achieved with the equivalent D1R or
D1R/LCD unit with remote display mounting flexibility.

10

Bind the connecting leads tightly over their entire length.

Before installation

1

Check that the voltage between neutral and earth does
not exceed 10 volts.

If this voltage does exceed 10 volts, the installation
is unsafe.

Find and rectify the cause of this fault before proceeding.
(For delta supplies with no neutral, see page 13).

2

Make sure that the supply voltage is suitable for the unit.

Supply Rated Unit Voltage
Voltage Range
(V

)(V

ESP 120 D1

Phase to

RMS

RMS

Neutral/Earth 110/120/127 90-150

ESP 208 D1 Series

Phase to Phase 190/208/220 156-260

ESP 240 D1

Phase to
Neutral/Earth 220/230/240 200-280

ESP 415 D1 Series

Phase to Phase 380/400/415 346-484

ESP 277 D1

Phase to
Neutral/Earth 240/254/277 232-350

ESP 480 D1 Series

Phase to Phase 415/440/480 402-600

)

Page |5Page |4

Installation

1

Location

Protectors need to be installed very close to the power
supply to be protected. Usually the protector will be
installed at a power distribution panel either inside it
(Figure 1) or right next to it (Figure 2).

ESP D1 protectors have been designed to fit onto a
standard 35mm DIN rail (see 3 - DIN Installation) or within
a Furse WBX D enclosure.

2

Enclose the ESP unit

The ESP unit has exposed terminals. For electrical safety,
the unit must be installed within a panel or enclosure.
For standard single and three phase units, where possible,
install the unit within the power distribution panel behind
a suitable viewing window.

Figure 1 ­ESP 415
D1/LCD
installed on
a DIN rail
within a
power
distribution
panel.

Installation instructions for mains wire-in protectors

Figure 2 - ESP 415 D1/LCD installed next to a power
distribution panel in a suitable WBX D enclosure.

Alternatively, for three phase units, a remote display option
is available. Units can be installed within the power
distribution panel with the remote display mounted on the
front of the panel (see 4 - remote display).

When mounting the units in existing metal panels or
enclosures, ensure that the enclosure is securely bonded
to the earth bar to which the ESP unit will be connected.

If it is not possible to install the unit within the distribution
panel it should be mounted in a separate enclosure,
see Figure 2, as close as possible to the distribution panel
(see 12 & 13 - Length of connecting leads). Gland the
enclosure onto the power distribution panel. Suitable
enclosures are available from Furse.

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Installation instructions for mains wire-in protectors

3

DIN Installation

ESP D1 Series protectors have been designed with an
innovative DIN foot for connection to standard 35mm DIN rails.
This DIN foot, comprising spring loaded steel DIN mounts,
enables rapid positioning of D1 protectors onto the rail.

Figure 3 - Reverse of
3 phase protector
showing innovative
spring loaded
DIN foot.

The spring loaded steel DIN mounts pull down and out
to lock into place ready for siting the protector.
Position the D1 protector at the preferred location on the
DIN rail and press the protector back to release the springs.
The protector locks into place.

Figure 4 - Reverse
of 3 phase protector
showing spring
loaded DIN foot
locked onto DIN rail.

Page |8

4

Remote display

Three phase ESP D1R and D1R/LCD units include a remote
mounting display to ensure optimum positioning of the
unit along with quick and easy status checking.

The remote display should be mounted in a clearly visible
position, typically on the front of the distribution panel
(see Figure 5).

For remote display connection, ensure the cable is of
sufficient length, and is unimpeded within the cabinet.
Allow a minimum of 60 mm behind the front panel for the
interconnection cable.

ESP D1R and D1R/LCD units are supplied with 1 m
interconnection cable as standard, with a 4 m cable
available as an option (contact Furse).

Figure 5 ­ESP 415 D1R/LCD
remote display
installed on the
front of a power
distribution panel.

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Installation instructions for mains wire-in protectors

S

PROTECTION

AC

E

Care should be taken against static discharge when
handling the remote display unit - avoid contact with the
exposed connector.

5

Parallel connection

ESP D1 protectors can be connected in parallel with the
supply to be protected, or connected in-line (series), for
power supplies ≤125A (see 6).

For parallel connection, the connecting leads do not carry
the load current of the supply, only the current associated
with suppressing the transient overvoltage.

I

T1

imp

I

20kA

n

T2 C

I

max

U

oc

125 AgL

4kA

B

40kA

DT3

6kV

Figure 6

- Parallel
connection
for single
phase supplies.

LL1N1N

PATENT
APPLIED

ESP 240D1

FOR

STATUS INDICATION

L N

GREEN

U

280V 47-63H

zac

c

GREEN & RED REDUCED

EN/IEC 61643

RED NO PROTECTION

WARNING: If lit /
flashing disconnect
unit & check Neutral
to Earth voltage

STATUS

11

14

12

FULL PROTECTION

PROTECTION
(replace unit)

!

Figures 6 & 7 show connection diagrams for single
phase and three phase star power supplies.

Connecting leads to the unit need to be kept short in
order to minimise additive inductive voltages.

Figure 7 - Parallel
connection for
three phase
star (4 wire and
earth) supplies.

6

Series connection

LL' L2 L2' L3 L3' NN'

PATENT
APPLIED

FOR

EN/IEC 61643

STATUS

11

14

12

Enhanced

URGE

Mains

Protector

TIV

The twin terminal design of ESP D1 units enables
installation in-line (series) with the power supply
(for power supplies ≤125A). The supply cables should be
suitably rated for the specific load current. The terminals of
the ESP unit can receive up to 35 mm2stranded cable.

Any type of protector installed in parallel (shunt) with the
supply will have additive inductive voltage on the connecting
leads. This resultant voltage let-through the protector is
hence seen by the equipment to be protected (see 5
and 12). Series installation eliminates the additive voltage
associated with connecting leads on parallel installations.

PE

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Installation instructions for mains wire-in protectors

R

SURG

P

N

A

E

Ensure the power supply does not exceed 125A
for series installations. The connecting leads to
phase/live terminals should be suitably fused (125A
maximum) ensuring full discrimination with the
immediate upstream supply fuse.

Figure 8 shows the connection diagram for three phase
star power supplies.

Figure 8 - Series
connection for
three phase star
(4 wire and
earth) supplies.

7

Connection to phase, neutral and earth

LL'L2 L2' L3 L3' NN'

PATENT

APPLIED

FOR

ESP 415D1

ROTECTIO

EN/IEC 61643

CTIV

STATUS

11

14

12

Connections are made to each supply conductor including
earth. Terminals marked L, N, (single phase units) or L1,
L2, L3, N, (three phase units) must be connected to
phase/live, neutral and earth respectively.

Under no circumstances must the ESP unit be installed
without connection to its neutral.

Where no neutral is present (eg delta supplies) the neutral (N)
terminal on the ESP unit must be connected to earth in
addition to the earth ( ) terminal. This will result in a greatly
increased earth leakage current.

On some delta supplies the voltage between phase and
earth/neutral may exceed the rating of the ESP unit.

Consequently, the supply’s phase to earth voltage must be
checked before installing the ESP unit.

We recommend that you consult Furse ESP before
installing ESP units on delta supplies.

Enhanced

E

Mains

Protector

PE

8

Connection point

(a) Protecting supplies feeding equipment in the building

The ESP unit is typically connected to the power supply
at a power distribution board/panel, either:

(i) on the load side of the incoming isolator (Figure 9).

(ii) on the closest available outgoing way to the incoming

supply (ie the incoming isolator).

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