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Installation instructions for mains wire-in protectors
Care should be taken against static discharge when
handling the remote display unit - avoid contact with the
exposed connector.
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.
Figures 6 & 7
show connection diagrams for single
phase and three phase star power supplies.
5
Connecting leads to the unit need to be kept short in
order to minimise additive inductive voltages.
Series connection
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 mm
2
stranded 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.
6
PE
Enhanced
Mains
Protector
EN/IEC 61643
PATENT
APPLIED
FOR
L
L'
L2
L2'
L3
L3'
N
N'
11
14
12
STATUS
SURGE
PROTECTION
ACTIVE
Figure 7 - Parallel
connection for
three phase
star (4 wire and
earth) supplies.
L
N
T2
C
T1
I
imp
4kA
I
n
20kA
I
max
oc
40kA
U
6kV
c
z
ac
U
280V 47-63H
B
D
T3
125 AgL
!
GREEN FULL PROTECTION
GREEN & RED
REDUCED
PROTECTION
(replace unit)
RED
NO PROTECTION
WARNING: If lit /
flashing disconnect
unit & check Neutral
to Earth voltage
EN/IEC 61643
PATENT
APPLIED
FOR
STATUS INDICATION
ESP 240D1
L
L
1
N
1
N
11
14
12
STATUS
Figure 6
- Parallel
connection
for single
phase supplies.
TNB 1639 ESP D1 Instructions (Final Art) new size 1/4/10 09:51 Page 10
