gefran GT 25 User manual

PROFILE
The GT family of solid-state relays has
been designed with the aim of providing
very accurate control of the load thanks
to an analog control input, in voltage at
0…5V; 0…10V or in current at
0…20/4…20mA or a potentiometer (from
1KΩto 10 KΩ).
The electronic design ensures that the
cycle time for proportioning the power is
automatically optimized.
Il numero di periodi che il GT fornisce al
carico (“treni d’ onda”) per un certo
valore di segnale di ingresso, è calcolato
in modo da essere il minimo possibile,
pur mantenendo la precisione
necessaria.
The number of cycles that the GT
supplies to the load (wave trains) for a
given input signal is calculated to be the
minimum possible to maintain the
necessary accuracy.
The GT can be used in three phase
systems, using master-slave control
architecture in which the control signal
drives only one GT (master) and this unit
supplies the synchronized signals to the
other slaves. Two GS modules can also
be used as slaves (logic control).
A load interrupt control option (HB) is
available without having to use an
external current transformer; alarm limit
is settable with trimmer and yellow LED
signal, with voltage-free contact, normally
open.
The GT solid-state relay has a green
LED to indicate the presence of the
24Vac power supply and a red LED to
indicate the switching based on the
analog control input signal.
The LED signal will be continuous (off at
minimum, on at maximum) at the ends of
the scale, pulsing for intermediate
values.
The units offer optional accessoires for
panel mounting, fuses and fuseholders,
current transformer, isolation
transformers.
Use the relè with an opportune heatsink
(see section accessories).
TECHNICAL DATA
General features
Category of use AC1
Nominal voltage
- 480Vac (max. range 24...530Vac)
Nominal frequency: 50/60Hz
Non-repetitive voltage: 1200Vp
Zero switching voltage: ≤20V
Voltage drop at nominal current ≤1.4Vrms
Power factor = 1
Control inputs
Voltage: 0...5Vdc, 0...10Vdc
(impedance ≥100KΩ)
Current: 0...20mA, 4...20mA
(impedance 125Ω)
Potentiometer: da1K a 10KΩ
(auto-fed by GT)
OUTPUTS
GT 25 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
25A
Non-repetitive overcurrent t=20 ms: 400A
I2t for blowout: ≤645A2s
dV/dt critical with output deactivated:
1000V/µs
GT 40 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
40A
GT 25 / 40 / 50 / 60 / 75 / 90 / 120A
SOLID STATE RELAYS WITH ANALOG CONTROL
Main features
•Command input from analogue voltage
or current signal or potentiometer.
•Switching at voltage zero crossing.
•Partialization of wave train power with
dynamically optimized time cycle.
•Antiparallel double SCR
•2 led for supply indication, “ON” state,
1 optional LED for load interrupt alarm
•4000V isolation between input circuit
and power output
•MOV (varistor)
•Optional monitoring of interrupted load
Main applications
•Plastics extrusion lines
and injection moulding
machines
•Polymerization plant for
synthetic fibre production
•Rubber moulding
machinery
•Driers for ceramics and
components for the
building industries
•Chemical and
pharmaceutical industries
•Industrial electric furnaces
•Food processing plants

Non-repetitive overcurrent t=20 ms: 600A
I2t for blowout: ≤1010A2s
dV/dt critical with output deactivated:
1000V/µs
GT 50 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
50A
Non-repetitive overcurrent t=20 ms: 1150A
I2t for blowout: ≤6600A2s
dV/dt critical with output deactivated:
1000V/µs
GT 60 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
60A
Non-repetitive overcurrent t=20 ms: 1150A
I2t for blowout: ≤6600A2s
dV/dt critical with output deactivated:
1000V/µs
GT 75 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
75A
Non-repetitive overcurrent t=20 ms: 1300A
I2t for blowout: ≤8000A2s
dV/dt critical with output deactivated:
1000V/µs
GT 90 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
90A
Non-repetitive overcurrent t=20 ms: 1500A
I2t for blowout: ≤11200A2s
dV/dt critical with output deactivated:
1000V/µs
GT 120 (SCR version)
Nominal currents of the device with
opportune heatsink in continuous work:
120A (complete with fan and standard
thermostat).
Non-repetitive overcurrent t=20 ms: 1500A
I2t for blowout: ≤11200A2s
dV/dt critical with output deactivated:
1000V/µs
Isolation
Rated isolation voltage input/output:
4000Vac
Power supply:
24Vac ±10%, 50/60 Hz
Absorption: 1.5VA
Max. isolation voltage: 300Vdc
Options:
Interrupted HB load alarm.
Controls the load by measuring current
on a shunt inside the device.
The alarm limit is set with a multirev
monorev trimmer.
The alarm output is obtained by means of
a solid state relay.
The contact is normally open (max. 30V,
150mA, conduction resistance 15Ω).
Thermal features
GT 25
Junction temperature: ≤125°C
Rth junction/case: ≤1.25 K/W
Rth junction/ambient: ≤12 K/W
GT 40
Junction temperature: ≤125°C
Rth junction/case: ≤0.65 K/W
Rth junction/ambient: ≤12 K/W
GT 50
Junction temperature: ≤125°C
Rth junction/case: ≤0.35 K/W
Rth junction/ambient: ≤12 K/W
GT 60
Junction temperature: ≤125°C
Rth junction/case: ≤0.35 K/W
Rth junction/ambient: ≤12 K/W
GT 75
Junction temperature: ≤125°C
Rth junction/case: ≤0.3 K/W
Rth junction/ambient: ≤12 K/W
GT 90
Junction temperature: ≤125°C
Rth junction/case: ≤0.3 K/W
Rth junction/ambient: ≤12 K/W
GT 120
Junction temperature: ≤125°C
Rth junction/case: ≤0.25 K/W
Rth junction/ambient: ≤12 K/W
Solid State Relay Dissipated Power
Calculation
Singol-phase static relay
Pds = 1.4 * IRMS [W]
IRMS = singol phase load current
Heatsink thermal resistance
Calculation
Rth = (90°C - T.amb. max) / Pd
where Pd = dissipated power
T.amb.max = max air temperature inside
the electrical cabinet.
Use a heatsink with thermal resistance
inferior to the calculated one (Rth).
Ambient conditions
• Working temperature: 0 to 80°C.
• Max. relative humidity: 50% at 40°C
• Max. installation altitude:
2000m asl
• Pollution level: 3
• Storage temperature: -20..85°C
Installation notes
- The heat sink must be grounded.
- The device must be protected by an
appropriate high-speed fuse (accessory).
- Applications with solid state power units
must also include an automatic safety
switch to cut out the load power line.
- Protect the solid state relay by using an
appropriate heat sink (accessory).
The heat sink must be sized according to
room temperature and load current (see
the technical documentation).
- Procedure for mounting on heat sink:
The module-heat sink contact surface
must have a maximum planarity error of
0.05mm. and maximum roughness of
0.02mm. The fastening holes on the heat
sink must be threaded and countersunk.
Attention: spread 1 gram of
thermoconductive silicone (we
recommend DOW CORNING 340
HeatSink) on the dissipative metal
surface of the module.
The surfaces must be clean and there
must be no impurities in the
thermoconductive paste.
Alternately tighten the two fastening
screws until reaching a torque of 0.60
Nm for the M4 screws and 0.75 Nm for
the M5 screws.
Wait 30 minutes for any excess paste to
drain.
Alternately tighten the two fastening
screws until reaching a torque of 1.2 Nm
for the M4 screws and 1.5 Nm for the M5
screws.
We advise you to randomly check for
proper installation by dismantling the
module to make sure there are no air
bubbles under the copper plate.
Limits of use
• dissipation of thermal power of device
with restrictions on temperature of
installation site.
• requires exchange with outside air
or an air conditioner to transfer
dissipated power outside the panel.
• installation restrictions (distances
between devices to guarantee dissipation
by natural convection).
• max. voltage limits and derivative
of transients in line, for which the
solid state unit has internal protection
devices (depending on model).
• presence of dispersion current
< 3mA for SCR version GS
< 4mA for TRIAC version GS
(max. value with rated voltage
and junction temperature of 125°C).

WORKING TYPOOLOGY
“Zero crossing” with variable cycle time
Examples of the operation of the GT for different values of the input drive signal and the consequent different cycle times
(100msec and 40msec respectively).
V
V
Example of input at 20% = 2V (IN 0-10V) or 4mA (IN 0-20mA)
V=Voltage across load
Example of input at 50% = 5V (IN 0-10V) or 10mA (IN 0-20mA)
V=Voltage across load
Logic output control for GT
GT thermal protection
t
t
t
ON
OFF
Red LED
ON Red LED Thermal alarm
V = Load voltage
Control
input
Thermal protection
activation

CALIBRATION PROCEDURE OF THE INPUT SIGNAL
FACEPLATE DESCRIPTION
g
c
b
f
e
d
a
Green LED (power on),
Red LED (GT running)
Red LED (thermal alarm), yellow LED
(load interrupt alarm, HB option)
Monorev trimmer for calibration of load
interrupt (HB) alarm limit
Monorev trimmer for minimum
calibration of input signal
Monorev trimmer for maximum
calibration of load signal
Dip switch for selection of input signal
(S1, S2, S3)
LINE connection LOAD connection
Reference connection of 230V line voltage
(HB option with 150V to 300V load) Reference connection of 480V line voltage (HB option with 300V to 530V load)
Alarm output
(solid state relay, HB option)
Synchronism signal for
Master/Slave connection - control signal
+ control signal
Reference voltage for potentiometer power supply (+ 10V)
24 Vac 50/60 Hz power terminal
The solid-state power unit, Gt, is supplied factory calibrated for 0..5V, 0..10V, 0..20mA, 4..20mA, 10Kohm potentiometer.
Minimum and maximum values are adjusted with two monorev trimmers (d,e).
Input signal type is selected with the adjustment f dip switches (S1,S2,S3).
125Ω
100KΩ
100KΩ
d
4% T
18%
V/mA
eIn
82%
96%
0-10V
4-20mA
0-20mA
f
S1-S3
0-5V
V/mA
In Rin
On
Off
125Ω
Control signal Dip Switch Position
S1 S2 S3
0...5Vdc OFF OFF ON
0...10Vdc ON OFF ON
0...20mA OFF ON ON
4...20mA OFF ON OFF
Minimum adjustment trimmer (d) turned fully counterclockwise sets the start conducting limit at 4% of the signal; turned fully
clockwise, the minimum conducting limit is set at 18% of the input signal.
Maximum adjustment trimmer (e) turned fully clockwise sets the full conducting limit at 96% of the signal; turned fully
counterclockwise, the full conducting limit is set at 82% of the input signal.

Notes on use of the GT with the digital On/Off control
CALIBRATION PROCEDURE OF THE INTERRUPTED LOAD ALARM
The interrupted load alarm function enables the GT to diagnose a variation of the load current (compared to a set limit),
distinguishing it from one caused by a change in grid voltage. The solid state power unit must therefore be supplied with the
voltage applied to the load terminals, i.e.: LOAD (L2): already connected internally;
LINE (hor i): connect terminal hfor voltages from 150 to 300V; connect terminal ifor voltages from 300 to 530V.
The alarm activates (relay closed and yellow alarm LED on) when the current, during the conduction of the device, falls below
a preset level that may be adjusted using the trimmer on the faceplate.
Calibration procedure (refer to the faceplate description drawing)
1) Use the adjustment system (or a calibrator) in order to supply the maximum signal (100% conduction or thered “ON” LED
always illuminated). As an alternative, you can configure the GT to 0-10 V DC input configuration and connect terminals 5
and 6.
2) Use a current sensing pliers to check that the load current is at rated level.
3) Turn alarm limit adjustment trimmer (g) fully clockwise. Check that yellow alarm LED (b) turns on.
4) Slowly turn trimmer (g) counterclockwise until the alarm LED turns off.
5) Turn the trimmer counterclockwise another 1/10 of a turn (1 notch on the scale).
In this way, the alarm limit is set below 10% of the rated load current.
N.B:
the partial load break alarm function operates with power partialization exceeding 15%. For partializations below 20%, tripping
times increase due to the reduced load activation time. For correct operation of the option, the load current has to exceed 30%
of rated current for the GT.
- The logic control signal has to be connected with the correct polarities to terminals 4 and 5 of the analog input.
- Turn minimum adjustment trimmer (d) fully counterclockwise and maximum adjustment trimmer (e) fully clockwise.
- Set the 3 dip switches (f) to off.
For applications with a very short work cycle, you can drive the solid state group by means of the Master/Slave signal by
driving it with a digital signal (OFF = 0 V dc; ON = from 4 V dc to 10 V dc)
Inhibiting the GT
You can inhibit operation of the GT by means of the Master/Slave signal.
To inhibit, connect control signal - (4) with the synchronism signal for Master/Slave connection (3).
Notes on use of the GT in Master/Slave configuration
The GT can be used as a master to drive other solid state groups (slaves). With Master/Slave signal (3), you can drive up to 9
GTs (see connection examples for GT solid state power relays with three-phase load). You can also use a GT to drive GS solid
state power relays (maximum of 2), as shown in the connection diagrams for GT/GS solid state power relays with three-phase
load (attention: the HB option cannot be used for a three-phase application with neutral).

Depth 34 mm. Weight 200gr.
DIMENSIONS AND CUT-OUT
100mm
60 mm
+10 Vdc
OutSupply
87
24 Vac Master
Slave
564
Input
Analog
30 Vdc/ac
231
Alarm
Out
PWR ON
GT 25A/480 Vac
AL
AC1 50/60 Hz
480 V
Load
e Max Adj
d Min Adj
c Reset Alarm
0..20mA
4..20mA
Line
230 V
f Input selection
g Alarm Adj
0..10V
0..5V
Line Line
L2 ihL1
47.5 mm 26 mm
100 mm
60 mm
Accessory
LAB-1
GT 25 - 40 - 50 - 60 - 75 - 90 - 120A
TEMPLATE DIMENSIONS
CONNECTION EXAMPLES
L2 hL1i
Master
AL
PWR
Line
230 V
GT 25A/480 Vac
e Max Adj
d Min Adj
c Reset Alarm
f Input selection
g Alarm Adj
Line
30 Vdc/ac
ON
2
Out
Alarm
1
Slave
3
Line
480 V
0..10V
0..20mA
4..20mA
0..5V
AC1 50/60 Hz
Load
+10 Vdc
Out
Input
Analog
456
24 Vac
Supply78
Neutral
Ground
Phase
Relay output - Alarm
(solid state relay)
Potentiometer
Load
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Single-phase connection (command input from analog signal or potentiometer)
Fuse
Controller 24Vac 1,5VA
*Connections regarding the
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect hor i
according to the load
tension.
**
*

CONNECTION EXAMPLES
Ground
Phase R
Phase T
Phase S
AC1 50/60 Hz
GT 25A/480 Vac
4..20mA
0..20mA
0..5V
0..10V g Alarm Adj
c Reset Alarm
f Input selection
e Max Adj
d Min Adj
Load
L2 Line
480 V
i
230 V
Line Line
hL1
AL
PWR ON
Analog
Supply
8Out 67 5
24 Vac +10 Vdc Input Slave 30 Vdc/ac
4321
Out
Alarm
Master
AC1 50/60 Hz
GT 25A/480 Vac
4..20mA
0..20mA
0..5V
0..10V g Alarm Adj
c Reset Alarm
f Input selection
e Max Adj
d Min Adj
Load
L2 Line
480 V
i
230 V
Line Line
hL1
AL
PWR ON
Analog
Supply
8Out 67 5
24 Vac +10 Vdc Input Slave 30 Vdc/ac
4321
Out
Alarm
Master
Potentiometer
Relay output - Alarm
(Solid state relay)
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Star or delta three-phase connection without neutral, with control of two phases.
Controller
24Vac 1,5VA
Fuse Fuse
*Connections regarding the
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect hor i
according to the load
tension.
** **
*
Three-phase connectionStar connection
45678
+10 Vdc24 Vac
Supply Out
Input
Analog
123
Out
30 Vdc/ac
Alarm
Master
Slave
ONPWR
AL
4..20mA d Min Adj
AC1 50/60 Hz
GT 25A/480 Vac
0..20mA c Reset Alarm
L1hiL2
0..5V
0..10V
Load Line
480 V
f Input selection
g Alarm Adj
e Max Adj
Line
Line
230 V
45678
+10 Vdc24 Vac
Supply Out
Input
Analog
123
Out
30 Vdc/ac
Alarm
Master
Slave
ONPWR
AL
4..20mA d Min Adj
AC1 50/60 Hz
GT 25A/480 Vac
0..20mA c Reset Alarm
L1hiL2
0..5V
0..10V
Load Line
480 V
f Input selection
g Alarm Adj
e Max Adj
Line
Line
230 V
45678
+10 Vdc24 Vac
Supply Out
Input
Analog
123
Out
30 Vdc/ac
Alarm
Master
Slave
ONPWR
AL
4..20mA d Min Adj
AC1 50/60 Hz
GT 25A/480 Vac
0..20mA c Reset Alarm
L1hiL2
0..5V
0..10V
Load Line
480 V
f Input selection
g Alarm Adj
e Max Adj
Line
Line
230 V
Potentiometer
Relay output - Alarm
(Solid state relay)
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Controller 24Vac 1,5VA
Phase R
Phase S
Phase T
Ground
Load Fuse Fuse Fuse
** ** **
*
*
Connections regarding the
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect hor i
according to the load
tension.
Star or delta three-phase connection without neutral, with control of three phases.

CONNECTION EXAMPLES
Phase S
Ground
Phase T
Neutral
Phase R
45678
+10 Vdc24 Vac
Supply Out
Input
Analog
123
Out
30 Vdc/ac
Alarm
Master
Slave
ONPWR
AL
4..20mA d Min Adj
AC1 50/60 Hz
GT 25A/480 Vac
0..20mA c Reset Alarm
L1
h
i
L2
0..5V
0..10V
Load Line
480 V
f Input selection
g Alarm Adj
e Max Adj
Line
Line
230 V
45678
+10 Vdc
24 Vac
Supply Out
Input
Analog
123
Out
30 Vdc/ac
Alarm
Master
Slave
ONPWR
AL
4..20mA
AC1 50/60 Hz
GT 25A/480 Vac
0..20mA
L1
h
i
L2
0..5V
0..10V
Load Line
480 V Line
Line
230 V
45678
+10 Vdc
24 Vac
Supply Out
Input
Analog
123
Out
30 Vdc/ac
Alarm
Master
Slave
ONPWR
AL
4..20mA d Min Adj
AC1 50/60 Hz
GT 25A/480 Vac
0..20mA c Reset Alarm
L1
h
i
L2
0..5V
0..10V
Load Line
480 V
f Input selection
g Alarm Adj
e Max Adj
Line
Line
230 V
d Min Adj
c Reset Alarm
f Input selection
g Alarm Adj
e Max Adj
Carico
Potentiometer
Three-phase star connection with neutral.
Controller
Relay output - Alarm
(solid state relay)
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Three-phase connection (triangle or star) without neutral, with control of two phases using one GT in Master configuration
and one GS in Slave configuration.
Ground
Phase R
Phase T
Phase S
GT 50A/480 Vac
AC1 50/60 Hz
g Alarm Adj
230 V
f Input selection
c Reset Alarm
d Min Adj
e Max Adj
Line
0..10V
0..20mA
4..20mA
0..5V
480 V
L2
Load i
Line hL1
Line
AL
PWR ON
21354768
Master
Slave
+10 Vdc
OutSupply
24 Vac
Analog
Input Alarm
30 Vdc/ac
Out ON/OFF Control
6÷32Vcc
ON
AL
AC1 50/60 Hz
GS 50A/480 Vac
LoadLine
Three-phase connection
Star connection
Potentiometer
Relay output - Alarm
(solid state relay)
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
Controller
Fuse
24Vac 1,5VA
Fuse Fuse
Fuse Fuse
24Vac 1,5VA
*
*Connections regarding the
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect hor i
according to the load
tension.
*****
*
**
*Connections regarding the
load interrupted option (see
paragraph “Interrupted load
alarm)
Note: connect hor i
according to the load
tension.
*

CONNECTION EXAMPLES
480 V
Line
0..20mA
GT 50A/480 Vac
AC1 50/60 Hz
4..20mA
+10 Vdc
876
OutSupply
24 Vac
L2
Load
Phase T
Ground
Neutral
Phase S
Phase R
32154
PWR ON
30 Vdc/ac
Master
Analog
Input Slave
Alarm
Out
AL
f Input selection
c Reset Alarm
d Min Adj
0..10V
0..5V e Max Adj
g Alarm Adj
ihL1
230 V
Line Line
ON/OFF Control
6÷32Vcc
ON
Line
GS 50A/480 Vac
AL
AC1 50/60 Hz
Load
AC1 50/60 Hz
AL
ON/OFF Control
6÷32Vcc
ON
Line
GS 50A/480 Vac
Load
Load
Potentiometer
Three-phase star connection with neutral using one GT in Master configuration and two GSs in Slave configuration.
Controller
24Vac 1,5VA
Digital output
0-20mA
4-20mA
0-10Vdc
0-5Vdc
ACCESSORIES
A wide range of accessories is available (including fuses and fuse holders, supports for fastening DIN bar, ID
plates, thermostats, current transformers and isolation transformers). To choose accessories, see the section
"Solid state relays - Accessories."
Fuse Fuse Fuse
TABLE OF TERMINALS AND CONDUCTORS
25/40A 6,3x9 Eye/fork / 2.5mm2
50/60A M3 tip 0.6Nm Max
75-90A 6,3x9 Eye/fork / 2.5mm2
M3 tip 0.6Nm Max
120A 6,3x9 Eye/fork / 2.5mm2
M3 tip 0.6Nm Max
16x18 Eye/fork 50mm2
M6 3.5-6 Nm
16x18 Eye/fork 50mm2
M6 3.5-6 Nm
16x18 Eye/fork 50mm2
M6 3.5-6 Nm
14x16 50mm2
M5 1.8-2.5Nm
14x16 50mm2
M5 1.8-2.5 Nm
14x16 50mm2
M5 1.8-2.5 Nm
Contact Type of pre- Max section. **
Size area isolated terminal conductor
(WxD) tightening
screwtype torque
Contact Type of pre- Max section. **
area isolated terminal conductor
(WxD) tightening
screwtype torque
Contact Max section. **
area conductor
(WxD) tightening
screwtype torque
CONTROL TERMINAL POWER TERMINAL GROUND TERMINAL •
(**) The max. sections specified refer to unipolar copper wires isolated in PVC.
• Note: For the ground terminal, you have to use an eye wire terminal.
(WxD) = Width x depth

WARNING: this symbol indicates danger.
Before installation, please read the following advices:
• follow the indications of the manual scrupulously when making the connections to the instrument.
• use a cable that is suitable for the ratings of voltage and current indicated in the technical specifications.
• if the instrument is used in applications where there is risk of injury to persons and damage to machines or materials, it is essential that it is used with
an auxiliary alarm device.
It is advisable to verify frequently that the alarm device is functional even during the normal operation of the equipment.
• The instrument must NOT be used in environments where there could be the presence of dangerous atmospheres (inflammable or explosive).
• During continuous operation, the heatsink may reach 100°C and remain at a high temperature due to thermal inertia even after the device is switched
off. Therefore, DO NOT touch the heat sink or the electrical wires.
• do not operate on the power circuit untless the main supply is disconnected.
• DO NOT open the cover if device is “ON”!
(use the holes in the cover for eventual re-calibration).
Installation:
• connect the device to the ground using the proper ground terminal.
• the power supply wiring must be kept separate from that of inputs and outputs of the instrument; always check that the supply voltage corresponds to
that indicated on the instrument cover.
• evitare la polvere, l’ umidità, i gas corrosivi, le fonti di calore.
• keep away from dust, humidity, corrosive gases and heat sources.
• The connection cable must be shorter than 3 meters if the current transformer is used.
Maintenance: Check the correct operation of the cooling fans at regular intervals; clean the ventilation air filters of the installation at regular intervals.
• Repairs must be performed only by specialized or appropriately trained personnel. Cut off power to the device before accessing internal parts.
• Do not clean the box with solvents derived from hydrocarbons (trichloroethylene, gasoline, etc.). Using such solvents will compromise the mechanical
reliability of the device. To clean external plastic parts, use a clean cloth wet with ethyl alcohol or water.
Technical service : GEFRAN has a technical service department. Defects caused by use not conforming to the instructions are excluded from the
warranty.
ORDER CODE
GEFRAN spa via Sebina, 74 - 25050 Provaglio d’Iseo (BS)
Tel. [phone] - fax [phone] - Internet: http://www.gefran.it DTS_GT_0709_ENG
Model GT
Nominal current 2525Aac
40Aac
50Aac
60Aac
75Aac
40
50
60
75
Nominal voltage 480480Vac
Load interrupt
(HB) option 0
Without option
With load
interrupt option 1
GT 480
/
•WARNINGS
-
GEFRAN spa reserves the right to make any kind of design or functional modification at any moment without prior notice
Please contact GEFRAN personnel for information on availability of codes.
90Aac
120Aac 90 120
This device conforms to European Union Directive 2004/108/CE and 2006/95/CE as amended with reference to generic standards:
EN 61000-6-2 (immunity in industrial environment) EN 61000-6-4 (emission in industrial environment) - EN 61010-1 (safety
regulations).
In Conformity with UL508 - File: E243386