Product Details Portlet

G4A PCB Power Relay

Miniature Single-pole Relay with 80A Surge Current and 20A Switching Current

  • Capable of Switching Motor Load of 80-A Surge Current and 20A Switching/Cut-off Current
  • Miniature, relay with high switching power and long endurance.
  • Creepage distance conforms to UL and CSA standards.
  • Highly noise-resistive insulation materials employed.
  • Standard model available with flux protection construction.
RoHS Compliant
Note: This web page provides an excerpt from a datasheet. Refer to Product Datasheet and other applicable documents for more information.
Quick-connect/PCB coil terminals
Contact form
Load Contact Terminal
Coil terminal
Rated voltage
packing unit
SPST-NO(1a)#250 quick-connect terminalsPCB terminalsG4A-1A-E12, 24 VDC50 pcs/tray
PCB terminals
Contact form
Load Contact Terminal
Coil terminal
Rated voltage
packing unit
SPST-NO(1a)PCB terminalsPCB terminalsG4A-1A-PE12, 24 VDC50 pcs/tray
Note:When ordering, add the rated coil voltage to the model number.

However, the notation of the coil voltage on the product case as well as on the packing will be marked as □□ VDC.
Coil Ratings
Rated voltage12 VDC24 VDC
Rated current75 mA37.5 mA
Coil resistance160 Ω640 Ω
Must operate voltage70% of rated voltage max.
Must release voltage10% of rated voltage min.
Max. permissible voltage160% of rated voltage at (23ºC)
Power consumptionApprox. 0.9 W
Note:1.The rated current and coil resistance are measured at a coil temperature of 23ºC with a tolerance of ±10%.

2.The inductances shown above are reference values.

3.Operating characteristics are measured at a coil temperature of 23ºC.

4.Max. permissible voltage refers to the maximum value in a varying range of operating power voltage, not a continuous voltage.

Contact Ratings
Contact typeSingle
Contact materialAg-Alloy (Cd free)
Rated carry current20 A
Max. switching voltage250 VAC
Max. switching current20 A

Motor Ratings
Load conditions
Switching frequency
Electrical endurance
250 VAC:
Inrush current: 80 A, 0.3 s (cosφ= 0.7)
Break current: 20 A (cosφ = 0.9)
ON: 1.5 s
OFF:1.5 s
200,000 operations

Inverter Ratings
Load conditions
Switching frequency
Electrical endurance
100 VAC:
Inrush current: 200 A (0-P)
Break current: 20 A
ON: 3 s
OFF:5 s
30,000 operations

Overload Durability (Reference Value)
Load conditions
Switching frequency
Electrical endurance
250 VAC:
Inrush current: 80 A (cosφ= 0.7)
Break current: 80 A (cosφ = 0.7)
ON: 1.5 s
OFF:99 s
1,500 operations

Contact resistance *1100 mΩ max.
Operate time20 ms max.
Release time10 ms max.
Max. operating frequencyMechanical18,000 operations/hr
Insulation resistance *21,000 MΩ min. (at 500 VDC)
Dielectric strengthBetween coil and contacts4,500 VAC 50/60 Hz for 1 min
Between contacts of the same polarity1,000 VAC 50/60 Hz for 1 min
Impulse withstand voltageBetween coil and contacts8.5 kV 1.2 x 50
Vibration resistanceDestruction10 to 55 to 10 Hz, 0.75 mm single amplitude
(1.5 mm double amplitude)
Malfunction10 to 55 to 10 Hz, 0.75 mm single amplitude
(1.5 mm double amplitude)
Shock resistanceDestruction1,000 m/s2
Malfunction200 m/s2
DurabilityMechanical2,000,000 operations min. (at 18,000 operations/hr)
Motor load200,000 operations min.
(ON/OFF: 1.5 s)
Inverter load30,000 operations min.
(ON: 3 s, OFF: 5 s)
Failure rate (P level) (reference value) *3100 mA at 5 VDC
Ambient operating temperatureOperating: -20ºC to 60ºC (with no icing or condensation)
Ambient operating humidityOperating: 5% to 85%
WeightApprox. 23 g
NOTE: The values here are initial values.

1.Measurement conditions: 5 VDC, 1 A, voltage drop method.

2.Measurement conditions: The insulation resistance was measured with a 500 VDC megohmmeter at the same locations as the dielectric strength was measured.

3.This value was measured at a switching frequency of 120 operations/min.
#250 quick-connect/PCB coil terminals
Mounting Holes

Terminal Arrangement /
Internal Connections

  (Top View)      (Bottom View)

Straight PCB/PCB coil terminals
PCB Mounting Holes
Terminal Arrangement /
Internal Connections


Correct Use


When mounting two or more relays side by side, provide a minimum space of 3 mm between relays.


The terminals fit FASTON receptacle 250 and are suitable for positive-lock mounting.
Use only Faston terminals with the specified numbers.
Select leads for connecting Faston receptacles with wire diameters that are within the allowable range for the load current.
Do not apply excessive force to the terminals when mounting or dismounting the Faston receptacle.
Insert and remove terminals carefully one at a time. Do not insert terminals at an angle, or insert/remove multiple terminals at the same time.
Refer to the following table for recommendations of connectors made by OMRON.

Type #250 terminalss(with: 6.35mm) Receptacle terminals XT3W-S441-12 XT3W-S442-12 XT3W-S443-12 Housing XT3B-1S white Note: The numbers shown in parentheses are for air-feeding.

●Other Precautions

This Relay is suitable for power load switching of air-conditioning compressors and power supplies, etc. Do not use the G4A to switch micro loads less than 100 mA, such as in signal applications.