G2R-1A-E-DC48 Omron, G2R-1A-E-DC48 Datasheet - Page 23
![RELAY](/photos/9/41/94184/g2r-1a-e_pwr_relay_sml.jpg)
G2R-1A-E-DC48
Manufacturer Part Number
G2R-1A-E-DC48
Description
RELAY
Manufacturer
Omron
Series
G2Rr
Specifications of G2R-1A-E-DC48
Relay Type
General Purpose
Contact Form
SPST-NO (1 Form A)
Contact Rating (current)
16A
Switching Voltage
380VAC, 125VDC - Max
Coil Type
Standard
Coil Current
11.5mA
Coil Voltage
48VDC
Turn On Voltage (max)
33.6 VDC
Turn Off Voltage (min)
7.2 VDC
Mounting Type
Through Hole
Termination Style
PC Pin
Circuit
SPST-NO (1 Form A)
Contact Rating @ Voltage
16A @ 250VAC
Control On Voltage (max)
33.6 VDC
Control Off Voltage (min)
7.2 VDC
Contact Rating
16 A
Contact Termination
Solder Pin
Mounting Style
Through Hole
Power Consumption
530 mW
Contact Material
Silver Alloy
Coil Resistance
4.17 KOhms
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
G2R-1A-E-DC48
G2R1AEDC48
Z2309
G2R1AEDC48
Z2309
I
7. Using the following formula, calculate the power dissipated by the
Total power dissipation vs. ambient temperature
In case the total dissipation exceeds the permissible power dissipa-
tion, either attach a radiator plate to the transistor, or replace the
transistor.
8. Determine the supply voltage to the relay.
C
vs. V
transistor to confirm that it is within the range of permissible
power dissipation of the transistor.
Total power dissipation P
pation P
P
(V
P
(For details on l
Confirm that P
representing the total power dissipation vs. ambient temperature
characteristics.
The maximum and minimum values of the supply voltage to the
relay are determined by the following expressions using the
upper- and lower-limit values of the pickup voltage V
step 6.
Maximum supply voltage ≤ Upperlimit pickup voltage + V
Minimum supply voltage ≥ Lowerlimit pickup voltage + V
C
B
CE
= Maximum value of pickup voltage/ Coil resistance x V
= l
is determined in step 6.)
CE
B
x 0.6 to 1
characteristics (Example)
B
where,
T
B
obtained by the above formula is within the curve
, refer to step 6.)
T
= Collector dissipation P
Electromechanical Relays
C
CE
+ Base dissi-
obtained in
CE
CE
CE
9. Verify that the following conditions are satisfied.
10.Check the following items during actual use of the relay.
From the above discussion, the best relay coil should be rated at
12 VDC or 24 VDC when the relay is driven by a transistor.
■ Driving by Darlington-
To reduce the current of the transistor to drive the relay (i.e., base
current of the transistor), two transistors may be used, via Darlington
connection. Darlington connected transistors are available enclosed
in a single package.
NPN-NPN Darlington Connection
When the Darlington-connected transistors are used, the required
value of V
reason, consideration must be given to designing the total power dis-
sipation and supply voltage for the second transistor, Tr2.
Rated voltage of relay
Coil current*
I
V
Driving current of transistor
Voltage drop V
Voltage dropV
Total power dissipation P
C
* Determine the safety factor giving consideration to external
* Inversely proportional to voltage
** Often used V
ECO
of switching transistor
V
V
• Is the upper-limit value of the pickup voltage equal to or less
• Is the lower-limit value of the pickup voltage equal to or more
• Are the above conditions satisfied within the operating tempera-
• Is there any abnormality found in a test run?
In addition to checking the above items, take into consideration
the items listed in this table.
Connected Transistors
CEO
CBO
surge (such as lightning and surge from other devices).
than the rated value when the maximum supply voltage is
applied?
than the rated value when the minimum supply voltage is
applied?
ture range?
, V
CEO
> (Maximum supply voltage + surge voltage) x safety factor*
> (Maximum supply voltage + surge voltage) x safety factor*
CE
of switching transistor**
Technical Information
is higher than when using a single transistor. For this
BE
CE
in transistor
in transistor
CEO
: 35 to 60 V
T
of transistor
Low
High
High
Low
High
High
High
High
High
Low
Low
High
Low
Low
Low
Low
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