G3NA Datasheet, PDF (15/18 Pages) List of Unclassifed Manufacturers – Solid-state Relay

Preventing Overheating with a
High-capacity Heat Sink (Y92B-P250NF)
• When the High-capacity Heat Sink is used, high-capacity switching
at 75 A or 90 A requires forced cooling with a fan. Connect the Fan
to a power supply according to its ratings specifications.
• If the Fan stops due to a power supply error, due to foreign matter
in the power supply connection, or due to aging, the Heat Sink will
heat to high temperatures, possibly resulting in failure of the SSR or
adverse affects on other devices. Implement an overheating pre-
vention measure, such as turning OFF the load current, if the Heat
Sink overheats.
• A thermostat is provided to detect overheating. The thermostat
uses a NC contact, i.e., the circuit will be opened for overheating.
This thermostat can be used to stop the operation of the SSR.
Implement an overheating prevention measure by using this signal
to output an alarm or perform another response applicable to the
system. Also, confirm that there is no problem with the overall sys-
tem.
• Do not connect the thermostat directly to the load power supply.
Connect it to a contactor or other shutoff device connected above
the SSR.
• Terminals equivalent to Faston #187 are used for the thermostat
terminals.
• Do not place heat-dissipating silicon grease on the thermostat.
• Do not solder the thermostat terminals.
• The following diagram shows a protective circuit example.
Circuit breaker
(coil side)
Coil
power
supply
Thermostat
(NC contact)
Y92B-P250NF
Circuit breaker
(contact side)
Load
G3NA
Load side
Input side
Circuit
breaker
Ventilating a High-capacity Heat Sink
(Y92B-P250NF)
• Refer to Ventilation Outside the Control Panel.
Operating Conditions
• Do not apply currents exceeding the rated current otherwise, the
temperature of the G3NA may rise excessively.
• As protection against accidents due to short-circuiting, be sure to
install protective devices, such as fuses and no-fuse breakers, on
the power supply side.
• Do not apply overvoltages to the input circuit or output circuit. Fail-
ure or burning may result.
• Do not drop the G3NA or otherwise subject it to abnormal shock.
Malfunction or failure may result.
• Keep the cooling system running continuously during the ON/OFF
operation of the SSR. This is to allow residual heat to dissipate
while the SSR is OFF.
Noise Terminal Voltage
According to EN55011
The G3NA-UTU complies with EN55011 standards when a capacitor
is connected to the load power supply as shown in the following cir-
cuit diagram.
3 m max.
C1
Input
G3NA-UTU
type
Output
Capacitor C2
• G3NA-2@@: 1 µF, 250 VAC
• G3NA-4@@: 0.5 µF, 500 VAC
Load
C2
Capacitor C1
0.1 µF
Varistor
• G3NA-2@@: 470 V, 0.6 W
• G3NA-4@@: 910 V, 0.8 W
• Connect capacitor C1 to both sides of the input terminals for a
G3NA with a DC input.
• Connect capacitor C2 to both sides of the load power supply out-
put.
• Connect the varistor to both sides of the G3NA output terminals.
• Do not use an input line that is longer than 3 m.
Loss Time
The loss time will increase when the G3NA is used at a low applied
voltage or current. Be sure that this does not cause any problems.
Loss time
Using DC Loads
For a DC or L load, a diode should be connected in parallel the load
to absorb the counter electromotive force of the load.
Input
SSR
Load
Load power
supply
Fuses
Connect a quick-break fuse in series with the load as a short-circuit
protection measure. Use one of the fuses in the following table or one
with equivalent or better characteristics.
Recommended Fuses
G3NA rated
load current
5A
8A
10 A
15 A
20 A
25 A
30 A
40 A
45 A
50 A
75 A
80 A
100 A
Fuse model Manufacturer
60LFF5
60LFF8
60LFF10
60LFF15
60LFF20
50SHA20
60PFF25
50SHA25
60PFF30
50SHA30
50SHA40
50SHA45
50SHA50
50SHA75
50SHA80
50SHB100
Kyosan Electric
Manufacturing
Company
Applicable SSR
G3NA-205B
G3NA-210B
G3NA-220B
G3NA-240B
G3NA-275B-UTU
G3NA-290B-UTU
Reverse Connection
The output terminal side of the G3NA-D210B is connected to a built-
in diode to protect the SSR from damage that may result from
reverse connection. The SSR, however, cannot withstand one minute
or more if the wires are connected in reverse. Therefore, pay the
utmost attention not to make polarity mistakes on the load side.
Solid State Relay G3NA 465