Gefran GS 15A, GS 25A, GS 40A, GS 50A, GS 60A Data Sheet

Main applications

• Plastics extrusion lines
and injection moulding
machines

• Packing and packaging
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

GS 15 / 25 / 40 / 50 / 60 / 75 / 90 / 120A

SOLID STATE RELAYS WITH LOGIC CONTROL

Main features

• Alternating current solid state relay

• Zero crossing switching

• Control input from VDC/VAC logic
signal

• Copper/semiconductor coupling
technology

• 10, 15, 20, 25, 40, 50, 60, 90, and
120 Arms nominal current

• Non-repetitive voltage: up to
1200Vp

• Nominal Voltage: up to 600Vac

• Integrated SCR thermal protection
with LED signal (only for models
with > 40A current)

• 4000 Vrms optoinsulation
(input-output)

• LED, drive input signal indicator

• MOV (varistors)

PROFILE

Zero crossing relay with antiparallel thy­ristor output is the most used solid state
relay in industrial applications.

“Zero crossing” relay is energised
when voltage meets the zero point
and disenergised when current meets
the zero point, depending on the
signal control on the input circuit.
When the relay has to stand high
currents for a long period, it is neces­sary to grant a proper dissipation and
an adequate electrical connection
between relay terminals and the load.

Use the relè with an opportune heatsink
(see section accessories).

Varistors, fuses, thermostats and fans
are available as fittings.

ALARM OPTION:

for models with AC control
(Input type = “A”)

OPERATING DESCRIPTION

The alarm output option activates closing
of an isolated contact when it detects the
following fault conditions:

• Control signal active but no current on
load (zero current, interrupted load)

• Control signal active but no power line
voltage (no line)

• Control signal active but SCR / heatsink
is in overtemperature (GS thermal pro­tection)

NOTE: in the absence of the control, the
alarm output is always open (the alarm
memory latch function is not possible, as
with GS with Type “D” input).

ALARM OPTION:

for models with DC control
(Input type “D”)

OPERATING DESCRIPTION.
The alarm output option activates an
isolated contact (or a PNP digital output)
when it detects the following fault condi­tions:

• Control signal active but no current on
load (Zero Current, Interrupted Load)

• Control signal active but no power line
voltage (no line)

• Control signal active but SCR / heatsink
is in overtemperature (GS thermal pro­tection)
The alarm output is latched: its state is
maintained even when the control signal
is switched off.
The alarm output resets when load cur­rent is restored or when the 24V_supply of
the GS is switched off and then on again
(V_supply reset).
The alarm output option is available in the
order code as an isolated contact Solid
State Switch (or as a PNP digital output)
with normally open contact (or normally
deactivated PNP output), or with normally
closed contact (or normally active PNP
digital output).

TECHNICAL DATA

B

A

C

D

General features

Category of use: AC1
Nominal voltage

- 230Vac (max. range 24...280Vac)

- 480Vac (max. range 24...530Vac)

- 600Vac (max range 24 ... 660Vac)
Nominal frequency: 50/60Hz
Non-repetitive voltage:

• 500Vp for model with rated voltage

230Vac

• for model with rated voltage 480Vac

• 1400Vp for models with nominal

voltage of 600VAC
Switching voltage for zero: < 20V
Activation time: ≤ 1/2 cycle
Deactivation time: ≤ 1/2 cycle
Potential drop at rated current: ≤ 1.4V
Power factor = 1

Control inputs

DC INPUT (Type “D”):
Max. input: < 10mA@32V
Max. reverse voltage: 36Vdc

AC INPUT (Type “A”):
Control voltage: 20...260VAC/VDC
Activation voltage: > 15VAC /VDC
Deactivation voltage: < 6VAC/VDC
Current draw:
<= 8 mAac/dc@260Vac/Vdc

Alarm output option

Interruption of the load or of the line
commands a contact (solid state switch
or a PNP digital output (max 30V, 150mA
resistance <15 ohm).
Maximum delay in tripping of load interrupt
alarm < 400ms
Maximum length of wires between GS
and load for correct operation of load
diagnostics < 25m

O

uTPuTS

GS 15

Nominal currents of the device with
opportune heatsink in continuous
work:15A
Non-repetitive overcurren t=20 ms: 400A

2

I

t for blowout: ≤450A2s
dV/dt critical with output deactivated:
1000V/µs

GS 25

Nominal currents of the device with
opportune heatsink in continuous work:
25A
Non-repetitive overcurrent t=20 ms: 400A

2

I

t for blowout: ≤645A2s
dV/dt critical with output deactivated:
1000V/µs

GS 40

Nominal currents of the device with
opportune heatsink in continuous work:
40A
Non-repetitive overcurrent t=20 ms: 600A

2

I

t for blowout: ≤1010A2s
dV/dt critical with output deactivated:
1000 V/µs

GS 50

Nominal currents of the device with op­portune heatsink in continuous work: 50A
Non-repetitive overcurrent t=20 ms:1150A

2

I

t for blowout: ≤6600A2s
dV/dt critical with output deactivated:
1000 V/µs

GS 60

Nominal currents of the device with op­portune heatsink in continuous work: 60A
Non-repetitive overcurrent t=20 ms:1150A

2

I

t for blowout: ≤6600A2s
dV/dt critical with output deactivated:
1000 V/µs

GS 75

Nominal currents of the device with oppor­tune heatsink in continuous work: 75A
Non-repetitive overcurrent t=20 ms:1300A

2

I

t for blowout: ≤8000A2s
dV/dt critical with output deactivated:
1000 V/µs

GS 90

Nominal currents of the device with oppor­tune heatsink in continuous work: 90A
Non-repetitive overcurrent t=20 ms:1500A

2

I

t for blowout: ≤11200A2s
dV/dt critical with output deactivated:
1000 V/µs

GS 120

Nominal currents of the device with oppor­tune heatsink in continuous work: 120A
Non-repetitive overcurrent t=20 ms:1500A

2

I

t for blowout: ≤11200A2s
dV/dt critical with output deactivated:
1000V/µS

Thermal protection

(only on GS models with > 40A current):

The SCR module’s temperature is constan­tly monitored inside the device. When the
maximum temperature threshold (T=110°C)
is exceeded, current flow to the load is inter­rupted and the condition is signaled by ligh-

Isolation

Rated isolation voltage input/output :
4000VAC rms SCR version

Thermal features

GS 15

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 2.0 K/W
Rth junction/ambient: ≤ 12.5 K/W

GS 25

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 1.25 K/W
Rth junction/ambient: ≤ 12 K/W

GS 40

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.65 K/W
Rth junction/ambient: ≤ 12 K/W

GS 50

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.35 K/W
Rth junction/ambient: ≤ 12 K/W

GS 60

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.35 K/W
Rth junction/ambient: ≤ 12 K/W

GS 75

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.3 K/W
Rth junction/ambient: ≤ 12 K/W

GS 90

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.3 K/W
Rth junction/ambient: ≤ 12 K/W

GS 120

Junction temperature: ≤ 125°C
Rth junction/case: ≤ 0.25 K/W
Rth junction/ambient: ≤ 12 K/W

Solid State Relay Dissipated Power
Calculation

Single-phase relay
Pd = 1.4 * IRMS [W] (for GS)
IRMS = single-phase load current

ting of the yellow thermal protection LED.

TEMPLATE DIMENSIONS

GS 15-25 18 47,5 100 24 M4

GS 40 20 47,5 100 35 M4

GS 50-60-75-90-120 26 47,5 100 60 M5

A

(mm)B(mm)C(mm)D(mm)

Heatsink Thermal Resistance Calcu­lation

Rth = (90°C - max amb. T) / Pd
where Pd = dissipated power
Max. amb. T = 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% to 40°C

• Max. installation altitude:

2000m asl

• Pollution level 2

• 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 (max. value with
rated voltage and junction temperature of
125°C).

DIMENSIONS AND MOUNTING MEASUREMENTS

depth: 34 mm
weight: 90 gr.

depth: 34 mm
weight: 115 gr.

depth: 34 mm
weight: 200 gr.