Gefran GRS-H 15A, GRS-H 25A, GRS-H 30A, GRS-H 40A, GRS-H 50A Data Sheet

GRS-H 15/25/30/40/50/60/75/90/120A

ULTRA-COMPACT STATIC POWER UNITS
WITH DC / AC LOGIC CONTROL

Main applications

• Extrusion, injection, blow moulding,
thermoforming of plastics

• Vulcanization of rubber

• Synthetic fibre production and
polymerisation

• Packing and packaging

• Dryers for ceramics and building
elements

• Industrial electric ovens

• Food processing plants

• Chemical and pharmaceutical industry

Main features

• Ultra-compact dimensions from 15A to
120A

• DIN rail and panel mounting

• Switching at zero voltage changeover

• Input command from DC/AC logic signal
with push-in connectors; signalling leds

• Cage clamps for power cables

• Load voltage 480V, 600V AC

• Thermal alarm option with led and
alarm output

• Interrupted load option with led and
alarm output

• Internal overvoltage protection

PROFILE

Correct management of electrical
heating elements for industrial heating
applications
requires robust, safe, interference­free, fast and diagnostically capable
static contactors.
The range of static contactors with
GRS-H heatsink meets all these
requirements, with current ratings
from 15 to 120 Amperes and voltages
up to 600 V AC, with extremely
compact size in every single current
level.
The thermal design of all models
guarantees the continuous supply
of the rated current at an ambient
temperature of 40°C through high
efficiency heat sinks, assisted by fans
for the 90A and 120A models.
The derating curves show how higher
current values can also be achieved,
at lower temperatures, and illustrates
the possibility of mounting various
devices packed together on the DIN
rail.

GRS COMMAND SIGNAL
CONNECTION

The GRS-H series can be controlled
by DC and AC logical signals
managed through push-in connectors
for a faster and easier connection,
even without tools.
The ON / OFF status of the static
device is always displayed by a
green LED on the front panel, for an
immediate view of its operation.

POWER CONNECTIONS

Both the line voltage terminal available
on the upper part of the device and
the load terminal on the lower part are
of the “cage” type, which offers the
best and safest seal even for cables
of different cross-sections, whether
mounted with a cable lug or simply
stripped.

DIAGNOSTICS AND ALARMS

It is increasingly vital for operators
and maintainers to recognize possible
anomalies in the system immediately
and solve them quickly in order to
ensure the efficiency and profitability
of machinery and plants. The GRS-H
series offers a series of diagnostic

information associated with a physical
alarm output with voltage-free or
PNP-type isolated contact.
The thermal alarm is triggered if
heat dissipation exceeds a critical
threshold, signalling it with a yellow
led on the front panel, interrupting the
power supply and triggering the alarm
output (NO or NC). This function is
always present for current levels from
50 A up to 120 A, and is available as
an option for other current levels.
The absence of current on the load (for
models with DC control) is indicated
by a red led on the front panel and by
the activation of the alarm output, as
well as by the absence of line voltage.
Alarm output status is memorized: in
the presence of a 24 V DC auxiliary
power supply, the alarm will be
memorized even in the event of an
OFF command.
The alarm is reset when normal
operating conditions are restored, or
when the 24 V DC auxiliary power
supply is switched off and on again.

TECHNICAL DATA

Main features

Category of use: AC51
Rated working voltage

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

- 600Vac (max range 24 ... 660Vac)

Rated frequency: 50/60Hz
Non-repetitive voltage:

• 1200Vp for model with rated voltage
480Vac

• 1400Vp for model with rated voltage

600Vac
Switching voltage for zero: < 20V
Activation time: = 1/2 cycle
Deactivation time: = 1/2 cycle
Potential drop at rated current:

= < 1,2Vrms

Power factor = 1

Control input

- DC INPUT (Type “D”):
Max. input: < 9mA @32V
Max. reverse voltage: 36Vdc
Control voltage: 6...32Vdc
Activation voltage: > 5,1Vdc
Deactivation voltage:< 3Vdc

- AC INPUT (Type “A”):
Control voltage: 20...260 Vac/Vdc
INSTALL FUSE (3A MAX) ON THE
CONTROL INPUT CIRCUIT
Activation voltage: > 15Vac/Vdc
Deactivation voltage: < 6Vac/Vdc
Current draw: <= 8 mAac/dc @ 260

Vac/Vdc

alarm output option
(type “D” input Version)

A load or line failure or an overtemperature
alarm commands:

- Options 1/2/5: one voltage-free contact
(solid state N.C or N.O.), max. properties:

- N.O. version 30V-150mA conduction

resistance: ≤ 1Ω

- N.C. version 30V-50mA conduction

resistance: ≤ 15Ω

- Option 3: two normally inactive
(parallelable) PNP digital outputs,
one for load failure and the other for
overtemperature (properties: Imax
=150mA Vout= + V DC power supply

-1V).

Maximum interrupted load alarm trip
delay < 400ms
Maximum cable length between GRS-H
and load for correct load fault diagnostics
< 25m

alarm output option
(type “a” input Version)

The over-temperature alarm commands
a voltage-free contact (solid state N.C.),
max. properties:

30V-50mA conduction resistance: ≤ 15 Ω

outputs

GRS-H 15

Rated current: 15 A@40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
620A
I2t for blowout: ≤ 1800A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 25

Rated current: 25 A@40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
620A
I2t for blowout: ≤ 1800A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 30

Rated current: 30 A@40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
620A
I2t for blowout: ≤ 1800A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 40

Rated current: 40 A@40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
620A
I2t for blowout: ≤ 1800A2s
dV/dt critical with output deactivated:
1000 V/µs

GRS-H 50

Rated current: 50 A@ 40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
1600A
I2t for blowout: ≤ 12800A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 60

Rated current: 60 A@ 40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
1600A
I2t for blowout: ≤ 12800A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 75

Rated current: 75 A@ 40°C in
continuous service
Non-repetitive overcurrent t=20 ms:
1600A
I2t for blowout: ≤12800A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 90

Rated current: 90A@ 40°C in
continuous service (complete with
specified fan)
Non-repetitive overcurrent t=20 ms:
1500A
I2t for blowout: ≤ 11250A2s
dV/dt critical with output deactivated:
1000V/µs

GRS-H 120

Rated current: 120A@ 40°C in
continuous service (complete with
specified fan)
Non-repetitive overcurrent t=20 ms:
1500A
I2t for blowout: ≤ 11250A2s
dV/dt critical with output deactivated:
1000V/µS

THERMAL PROTECTION

(Optional, always present in GRS-H with

current size ≥ 50A):

The temperature of the SCR module is
constantly monitored inside the device.
When the maximum temperature
threshold of the internal SCR is
exceeded, current conduction to the load
is interrupted and the yellow thermal
protection LED comes on to signal the
condition.

Isolation

Rated isolation voltage input/output:

4000VACrms 1min

Ambient conditions

• Working temperature:

from 0 to 80°C (according with
heat sink curves)

• Max. relative humidity:

90% non-condensing at 40°C

• Max. installation altitude:
6600ft above sea level

• Pollution level : 2

• Storage temperature:

-20..+85°C

Installation notes

Use the extra-rapid fuse shown in the
catalogue according to the connection
example supplied.
Applications with static units must also
include a safety circuit breaker for
disconnecting the power line from the
load.
To obtain high reliability of the device,

• Horizontal distance between one
device and another at least 20mm
(in the event of installation at shorter
distances, see derating curves).
Make sure that the cable ducts do
not reduce these distances; in this
case, mount the units overhanging the
panel, so that the air can flow vertically

on the heat sink without hindrance.
it is essential to install it correctly inside
the panel in order to obtain adequate
heat exchange between the heat
sink and the surrounding air under
conditions of natural convection.
Mount the device vertically (maximum
10° inclination from the vertical axis)

• Vertical distance between a device
and the panel wall >100mm

• Horizontal distance between a device
and the panel wall at least 20mm

• Vertical distance between one device
and another at least 300mm.

Limits of use

• Ambient temperature limits, depending
on derating curves.

• Need for air exchange with the outside
or an air conditioner to transfer the
dissipated power to the outside of the
panel.

• Installation limits (distances between
devices to ensure dissipation under
natural convection conditions)

• Maximum voltage limits and derivative
of the transients present on the line, for

DIMENSIONS AND MOUNTING MEASUREMENTS

which the static unit provides internal
protection devices (depending on the
models).

• Presence of leakage current < 3mA
(max. value with nominal voltage and
junction temperature of 125°C).

Model 15-25A 30A 40-50A 60-75A 90-120A

Weight [g] 194 237 388 688 796

Notes:

The dimensions are representative of all models of the series (command “D” type, “A” type and with options)

DIN RAIL FIXING

DIN rail coupling sequence DIN rail release sequence

(*) Use of a slotted screwdriver with a max. diameter of 6mm is recommended

SCREW DRIVER (*)

PANEL FIXING

DESCRIPTION OF CONNECTIONS

GRS-H...D-0 GRS-H...D-1 GRS-H...D-2

Description of terminal/connector versions with type “D” input

Power terminals (common to all versions)

Rif. Description Notes

1/L1 Line Connection

2/T1 Load Connection

Signal connector version without options (GRS-H...D-0)

3/A2- GND Control input ON/OFF Control input ground

4/A1+ +Vdc control input ON/OFF Range from 6 to 32 Vdc, Imax <9 mA a 32V

Signal connector version with options “1 “ and “2 “ type (GRS-H…D-1/2)

GND for power supply and control input

3/A2-

ON/OFF

4/Us + Vdc power supply

5/A1+ +Vdc control input ON/OFF Range: ON from 5 to 32Vdc, Imax <0,5 mA a 32V OFF< 1,8V

GND Control input ON/OFF

6/A2-

(common to terminal 3/A2-)

GND Control input ON/OFF

6/A2-

(common to terminal 3/A2-)

7/AL

Alarm output:

- Interrupted load

- Line voltage absent

8/AL

- Overtemperature

Control input ground

Power supply for optional functions (Range from 6 to 32 V DC, Imax < 14 mA at 32V

GRS-H-90..120A-..FAN63: Power supply options + Fan
(Range from 20 to 27 V DC, Imax <150 mA at 24V with Fan active)

Additional connection to be used only as GND for the control signal

Version with option 1 Version with option 2

Additional connection to be used only as GND for the control signal

Solid state N.O. contact
Imax =150mA
Vmax = 30 V DC/25V AC

Z_closed < 1 Ω
Z_open > 1 MΩ

Solid state N.C. contact
Imax = 50mA
Vmax = 30 Vdc/25Vac

Z_closed < 15 Ω
Z_open > 1 MΩ

Note: The connections are also representative of 90-120A models