Gefran GTD 25A, GTD 40A Data Sheet
PROFILE
The GTD series of power solid state
relays (zero crossing type) are solid state
actuators with built-in heatsink, heater
break diagnostics (Hb function),
selectable current scale, and adjustable
setpoint.
Junction overheat protection is available
as an option.
An alarm signal is provided in output.
The GTD series of power solid state
relays are offered with currents of 25A
and 40A, rated voltage 480 VAC, and
Vdc input control signal.
Voltage transistors are protected by MOV
(varistor).
All models are designed to guarantee
performance at rated currents, with
continuous power conduction at 40°C.
See the dissipation curves for other
performance conditions.
Thanks to their high performance, they
are appropriate for very short switching
times, with millions of operations without
wear on components.
Various accessories are available, such
as a front panel attachment, fuses and
fuse holders.
TECHNICAL DATA
General features
Category of use: AC1
Nominal voltage:
480Vac (max. range 48...530Vac)
Nominal frequency: 50/60Hz
Non-repetitive voltage: 1200Vac
Zero switching voltage: < 20V
Activation time: =1/2 cycle
Deactivation time: =1/2 cycle
Voltage drop at nominal current:
= 1,4Vrms
Power factor = 1
Control inputs
Max. input: < 5mA@30V
Max. reverse voltage: 36Vdc
Control voltage: 5...30Vdc
Activation voltage: > 4,25Vdc
Deactivation voltage: < 3Vdc
Power supply
Vs = 20...30Vdc ±10%
Input 30mA at 30Vdc
Outputs
GTD 25
Nominal current: 25A@40°C in continuous service
Non-repetitive overcurrent t=20ms: 400A
I
2
t for blowout: 645A2s
dV/dt critical with output deactivated:
1000V/µs
GTD 40
Nominal current: 40A@40°C in continuous service
Non-repetitive overcurrent t=20ms: 600A
I
2
t for blowout: 1010A2s
dV/dt critical with output deactivated:
1000V/µs
DIAGNOSTICS
Heater break Alarm (Hb)
Checks load by measuring current inside
the device.
Current full scale is selectable: 5, 10, 15,
20, 25, 30, 35, 40A.
The alarm setpoint can be set at 10
levels within the selected scale.
Overtemperature alarm (optional)
Provides protection against junction
overtemperature in “or” with the Hb
alarm.
Alarm output
The alarm output is PNP type (not
protected against short circuit)
(output voltage = Vs - 0.7Vdc,
Rout = 82Ω, Iout max. = 20mA)
The alarm is signaled by a yellow LED.
GTD 25 / 40A
POWER SOLID STATE RELAYS WITH LOGIC CONTROL AND
DIAGNOSTICS
Main features
• AC power solid state relays with logic
signal control
• Switching at voltage zero crossing
• Built-in heatsink
• Rated current: 25Arms, 40Arms
• Non-repetitive voltage: 1200 Vp
• Rated voltage: up to 530VCArms
• Input control range: 5…30 Vdc
• Optical isolation: 4000Vrms
(input/output)
• Built-in HB diagnostics (partial heater
break, junction in short circuit)
• Overheat protection (optional)
• 2-color control signal LED in
input/alarm state
• On-board MOV (varistor)
• DIN rail or panel mounting (optional)
Main applications
• Plastics extrusion lines
and injection moulding
machines
• Packing and packaging
machines
• Polymerization plant for
synthetic fibre production
• Chemical and
pharmaceutical industries
• Industrial electric ovens
• Food processing plants
HEA TER BREAK (Hb) ALARM FUNCTION
Isolation
Rated isolation voltage for power
control/output: 4000VACrms
Ambient conditions
• Working temperature:
0 to 80°C (see the dissipation curves)
• Max. relative humidity: 50%...40°C
• Max. installation altitude:
2000m asl
• Pollution level: 3
• Storage temperature: -20...85°C
Installation notes
Use the high-speed fuse specified in the
catalog according to the connection
example given.
Applications with solid state relays must
provide an automatic safety switch to cut
power to the load.
In order to obtain best reliability, it is
important to install a heatsink correctly
inside the panel, to reach an adequate
thermal exchange between the device
and the surrounding air in natural convection conditions.
Mount it vertically (max. 10° dinclination
from the vertical axis)
• Vertical distance between a device and
the panel walls >100mm
• Horizontal distance between a device
and the panel walls: at least 20mm
• Vertical distance between devices: at
least 300mm.
• Horizontal distance between devices: at
least 20 mm. Make sure that the wire
raceways do not reduce such distances:
if they do, install the groups cantilevered
to the panel so that air can flow vertically
over the heat sink without obstructions.
Limits of use
• Dissipation of thermic power on the
device with restraints on the ambient
temperature of the installation.
• Equip the cabinet with an external air
change or air-condition it, to put out dissipated power.
• Installation restraints (distances to be
respected to grant dissipation with natural convection).
• Line transistor max. voltage and derivative limits, for which the power solid state
relay is equipped with inside safety devices (based on the models).
• Leakage current < 3mA
(max. value with rated voltage and junction temperature of 125°C).
The heater break (Hb) alarm function lets the instrument diagnose a drop in load current (II) below a settable limit
(It) during operation.
The unit in short circuit is also diagnosed by monitoring any current conducted in the absence of the control signal.
Setting the alarm
The full scale (maximum value) of the limit is set with the dip switches located under the instrument cover.
With the single-turn trimmer, you can shift the set point from 0% (turning the trimmer clockwise) to 100% (turning
the trimmer counterclockwise) on the set full scale.
FACEPLATE DESCRIPTION
1: Aux. power supply 24Vdc (Vs)
2: Common (0V)
3: Control signal (+)
4: Alarm output
5: Load terminal
6: Ground terminal
7: Line terminal
8: 2-color signal LED (red/yellow)
9: Internal trimmer to set Hb
diagnostics setpoint
10: Dip switch to select Hb diagnostics
scale
11: LAB-1 relay ID label
11
5 6 7
1 2 3 4
10
9
8
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