G3PA24 Datasheet, PDF (14/18 Pages) Omron Electronics LLC – Extremely Thin Relays Integrated with Heat Sinks

Close Mounting
SSR Mounting Pitch
Panel Mounting
(At a rated ambient temperature of 40°C).
Duct or airflow obstruction
SSR
Mounting direction
Vertical direction
80 mm min.
Space between
SSRs
60 mm min.
Between duct
or airflow
obstruction
and SSR
30 mm min.
Close Mounting
min.
An SSR uses a semiconductor in the output element. This causes
the temperature inside the control panel to increase due to heating
resulting from the passage of electrical current through the load. To
restrict heating, attach a fan to the ventilation outlet or air inlet of the
control panel to ventilate the panel. This will reduce the ambient tem-
perature of the SSRs and thus increase reliability. (Generally, each
10°C reduction in temperature will double the expected life.)
Load current (A)
10 A 20 A 30 A 40 A 60 A
Required number of fans 0.16 0.31 0.47 0.62 0.93
per SSR
Example: For 10 SSRs with load currents of 20 A,
0.31 x 10 = 3.1
Thus, 4 fans would be required.
Size of fans: 92 mm², Air volume: 0.7 m³/min,
Ambient temperature of control panel: 30°C
If there are instruments that generate heat in the control panel
other than SSRs, additional ventilation will be required.
Relationship between SSRs and Ducts
Duct Height
Countermeasure (1) Countermeasure (2)
Duct or
airflow
obstruction
G3PA
50 mm max.
(A height of no
more than half
the SSR's height is
recommended.)
G3PA
G3PA
Airflow
Vertical
direction
Duct or
airflow
obstruction
Do not surround the SSR
with ducts, otherwise the
heat radiation of the SSR
will be adversely affected.
Use short ducts.
Ventilation
If the ducts cannot be
shortened, place the SSR
on a metal base so that it
is not surrounded by the
ducts.
G3PA
Be aware of air flow
Duct or
air flow
obstruction
G3PA
Ventilation
outlet
G3PA
Air inlet
If the air inlet or air outlet has a filter, clean the filter regularly to pre-
vent it from clogging and ensure an efficient flow of air.
Do not locate any objects around the air inlet or air outlet, otherwise
the objects may obstruct the proper ventilation of the control panel.
A heat exchanger, if used, should be located in front of the SSR Units
to ensure the efficiency of the heat exchanger.
Please reduce the ambient temperature of SSRs.
The rated load current of an SSR is measured at an ambient
temperature of 25 or 40°C.
450
Solid State Relays G3PA