SURGE PROTECTION DEVICES
TRANSIENT SURGES ARE CAUSED MAINLY BY LIGHTNING, SWITCHING AND ELECTRICAL FAULTS. The Secondary effect of
lightning causes transient over voltages which damages sensitive electrical and Electronic equipments installed
Indoor/Outdoor. The commonly used protective devices like HRC Fuses, MCBs, ELCBs etc. are current sensing devices
and they sense /operate in a few milli seconds. Since the surge is a Transient over voltage which occurs for few
microseconds, these devices cannot sense them.
Hence, Indian and International Standards recommend installation of Surge Protection Devices. The SPDs are to be
installed in addition to the UPS to protect the sensitive electrical and electronic equipments. In fact, the IEC and IEEE
standards have made it mandatory that, wherever external lightning protection is provided, Surge Protection Devices also
shall be installed. The function of a surge protection device is to sense and limit the transient over voltages to levels
which the connected equipment can withstand safely.
The surge protection is required to be provided for POWER,SIGNAL ,ETHERNET and TELECOM lines.
POWER LINES
SPDs for Power lines are available for DC, AC, Single phase and Three phase applications. International Standards
recommend graded protection for power Lines. i.e different types of SPDs shall be provided at various levels of the power
system namely, the Main switchboard, sub switchboard, distribution board and near the equipment etc,. To make the
protection simple & effective we are offering four types of SPDs for Power Lines which meet the requirements of the
international standards.
Type I (Class B) –High performance spark gap type SPD for Installation at the Main switch board in
monoblock format.
Maximum Continous operating Voltage (Uc)
Lightning impulse current (10/350) (I imp)
Nominal discharge current (8/20) (In)
Voltage protection level at In (Up)
Short circuit withstand (ICC)
Response time (L-N) (tA)
Follow through current (L-N) (Ifi)
Maximum back up fuse (gL)
CSH1
:
:
:
:
:
:
:
50/230 (L-N)
275 V
50 KA
50 KA
<2 KV
50 KA
100 ns
50 KA
: 200 A
CSH1-100 (N-E)
255 V
100 KA
50 KA
< 2 KV
25
KA
100 ns
100 KA
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JEF CPT PSC4 : A Din Rail Mount type, combined Type I & II (Lightning &swiching Surges) Class B & C suitable for
installation at SSB / DB
SALIENT PARAMETERS OF JEF CPT PSC 4
Maximum Continous Operating Voltage (Uc )
Lightning Impulse current (10/350)(Iimp)
Maximum discharge current (8/20)(Imax)
Nominal discharge current (8/20)(In)
Voltage Protection level (Up)
Maximum back-up fuse( gL)
Short circuit withstand capacity (Icc)
Response time (tA)
: 275 /480V Three phase
: 12.5 kA (L-N)/50kA (N-PE)
: 65 kA (L-N & N-PE)
: 20 kA (L-N)/50kA (N-PE)
: <1.3kV (L-N)/1.5kV (N-PE)
: 125 A
: 25 kA
: 25 (L – N) / 100 (N-PE) nano seconds
SALIENT FEATURES: * Combined Class I and II protection * Pluggable elements Ease of Maintenance
* Local Status Indication and remote indication with potential free contacts * Compact – 4 pole * High Lightning
surge handling capability *Single phase model also *Iimp of 7.5 kA
JEF CPT PSM4 : A DIN Rail mount type II SPD suitable for installation near the end equipment.
Maximum Continous Operating Voltage (Uc)
Maximum discharge current (8/20) (Imax)
Nominal discharge current (8/20)(In)
Voltage protection level
Maximum back-up fuse(gL)
Short circuit withstand capacity (Icc)
Response time (tA)
Follow through current (Ifi)
: 275 V (L – N) / 265 V (N-PE)
: 40 kA
: 20kA / 40kA
: <1.3kV (L-N) / 1.5kV(N-PE)
: 125 A
: 25k A
: 25 (L-N) / 100 (N –PE) nano seconds
: 100 A (N-PE)
CPT – MSPD –A Multi element combined protector :
JEF CPT MSPD Is designed for installation at SSB or DB level. This offers combined (Class I & II ) protection. Since
these surge protection devices are generally connected parallel to the power circuit, they are independent of
load current.
Complies with the performance requirements of IEC 61643-11. Each Surge arrester (which is provided between
phase to earth or phase to neutral and neutral to earth) has 3 elements, out of which, when one element
disconnects, its’ status indicator flag turns red, gets automatically disconnected and the balance elements are in
service. Remote indication about the status of the element can also be
Salient Parameters of Jef CPT MSPD
Salient Features Of Jef CPT MSPD
* Maximum Continous Operating Voltage (Uc) : 320 volts
* Combined Type I & II (B + C) protection
* Lightning lmpulse Current (limp) : 15 kA (10/350µs) Per Phase * Modular configuration Ease of Maintenance
* Maximum Surge Current(Imax) : 100 kA (8/20µs) Per Phase
* Exceeds the surge current handling parameters
* Nominal surge Current (Inom)
: 30 kA (8/20µs) Per Phase
Mandated by IEC standards.
* Voltage protection level
: < 1.8 KV (L – N, L-G, N-G )
* Residual Voltage at 5kA
: Less than 1000 V
* Local Status indication with potential free
* Response time (tA)
: Less than 25 nano seconds
contacts for remote indication
* Available in IP 65 enclosure OR DINRAIL FORMAT
* Multiple levels of Redundancy
The MSPD is recommended for every office, factory wherever Computers, CNC machines, sophisticated
electronics systems and drives are deployed.
JEF CPT MSPD REGULAR
The Regular model offers common mode protection, where the configuration is between each phase to earth and
neutral to earth.
JEF CPT MSPD ALL MODE
Model offers common and differential Protection. Between each phase to neutral, each phase to earth and
between neutral to earth. Hence, this model is highly recommended for installation at the main incomer even at
remote areas where periodical maintenance is difficult. Because of its’ ability to handle higher surge currents &
built redundancy, it has longer life.
SPD for Telephone Lines
All the equipments connected to any type of telephone lines, whether RTC, ADSL, PP or RDSI
must be protected due to the fact that they are very sensitive with very low surge withstand
capacity. Operating voltage of this kind of lines do not normally exceed one hundred volts.
Many installations include data transmission equipment such as modems, telecom switches,
etc. We offer a wide range of protector for telephone and internet lines, including protectors
in different formats : DIN rail, Aerial , Krone and 19” rack.
Protected equipments : EPABX, Modems, Computers, Routers, Telecom Switches
SPDS for Data Networks The increased use of computers as a management tool and the
information stored on these equipments makes the Ethernet a critical part of an installation.
The computers are highly sensitive to transient overvoltages. In addition to the cost of
replacing the damaged equipment, there is also the loss of data, which in many cases, can
be of an incalculable value.
* Ethernet UTP CAT 6 & Cat 5E and POE
* 19” Rack protector upto 24 ports
* Connections by IDC and RJ 45 connectors
Protected equipment : Computers, Servers, Network Switches
SPD for Radio Frequency
The RF signal receiver or transmitter generally located at High elevations are normally
prone to atmospheric surges and needs protection. Our CT10 range of products, based on
GDT technology are designed to protect equipments connected to RF signals such as
cameras, receivers, satellite TV or CCTV equipment.
SPD for Load Cell Specially designed to protect load cells, weighbridge, 3 and 4 wire RTD sensors, strain gauge
sensors, and the measuring instrument of the weighbridge against surges and transients.
Provides all mode protection in a waterproof enclosure for harsh environment with failsafe design.
JEF’s other activities include turnkey solutions from design to installation and commissioning of
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Environment Friendly and Maintenance Free Earthing Solutions
External Lightning Protection with conventional type & ESE type.