EDS8-5H Datasheet, PDF (1/2 Pages) Fuji Electric – ARRESTER

ARRESTER
DATA SHEET
PXC
At places such as water purification plants, sewage treat-
ment plants and dams, there are often cases where instru-
ments are damaged due to lightning.
This arrester is used for protecting transmitters and receiv-
ing instruments from surge voltage induced in transmission
lines due to lightning etc. Two types of arresters, field-
mount type and panel-mount type, are available.
The arrester, using FUJl's Z-trap, offers high performance
and reliability, and is optimum for protecting semiconduc-
tor circuits in instruments from surges.
FEATURES
1. Used as the arrester element is the Z-trap, which was
developed at FUJl's central research laboratory and is al-
ready being widely used in products. The Z-trap is a
gapless arrester made from a sintered body which con-
sists mainly of zinc oxide, and offers the following re-
markable features.
• An excellent voltage limiting characteristic.
• A large surge absorption capacity despite its small size.
• Can absorb rapidly pulsating surge because of its fast
response.
• Voltage and current characteristics are symmetrical,
so surges of both positive and negative polarity are
equally absorbed.
• Stable against repetitive surge.
• High reliability.
2. Performance is boosted by adding secondary and tertiary
protective circuits made up of resistors and zener diodes
as back-up circuit elements together with the Z-trap. This
provides excellent protection for semiconductors.
3. This is the panel-mount type (PXC) for receiving instru-
ment protection.
The panel-mount type can be wired systematically at the
bottom of the instrument panel together with external
wiring and junction terminal board.
4. Being an exclusive arrester for FUJI instruments the anti-
surge characteristic of the system instruments and the
excellent protection afforded by the arrester combine to
allow utilizing the system with no worry whatever.
The arrester can also be used with 4 to 20mA signal cir-
cuits of other manufacturers instruments.
SPECIFICATIONS
Construction:
Housing
Synthetic resin, junction terminal
strip structure
Arrester element
FUJI-Z trap
Secondary protective cct. Resistors, zener diodes
Tertiary protective cct. Zener diodes
Panel-mount type (PXC)
Working voltage: 27V DC or less (for 4 to 20mA DC)
Wiring method: 2 wire system
Internal resistance:
Between terminals 1–2, 5–6;
10Ω each … total 20Ω
(max. 24Ω)
Discharge starting voltage:
85V DC ± 15%
Protective performance:
Limiting voltage; 50V or less between transmission line
and ground or another transmission line
(at 100A discharge)
Operation delay; nearly 0 µs
Impulse discharge withstand current;
2000A with 8 x 20 µs impulse wave
No. of repetitive discharges;
400 times with 8 x 20 µs impulse wave,
100A discharge current and 15 sec. re-
peating interval.
Note: Although this is a highly effective arrester, there are no de-
vices that guarantee 100% protection against any type of light-
ning. From the data collected so far it can be said that the
surge voltage induced by most lightning is done in (10x200) µs
with crest value 5kV. In certain regions it is said to strike over
a hundred times every year. It is probable that protection might
be insufficient against impulses generated due to high volt-
ages in direct lightning.
Error due to addition of arrester:
Less than 0.1%
Grounding system:
Grounding in coupled condition with in-
strument
Grounding construction JIS class 1 or
special class 3
Ambient temperature:
0 to 45°C
Mounting method:
On copper busbar with two M4 screws
External dimensions (HxWxD):
55 x 70 x 39mm
Mass{weight}: Approx. 250g
Finish color: Synthetic resin (black)
EDS8-5h
Date Nov. 22, 2001