Product Details Portlet

G9EJ DC Power Relays

DC Power Relays Capable of DC Loading at High Voltage and Current

  • Actualize improvement of inrush-withstand performance and a long-life by adopting Omron’s own contact driving system.
  • Actualize a high capacity interruption through the function of extinction of magnetic arc by adopting high-efficiency magnetic circuit.
  • Small and lightweight type. Size: H30 mm × W27 mm × L31 mm, Weight: approx. 50 g.

Please confirm Omron Safety Precautions for all automotive relays first.
Omron can not guarantee automotive relays before finish making a contract with product specifications.

RoHS Compliant
Model 2D/3D CAD ECAD(Download symbol,FootPrint,3DCAD)
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G9EJ-1 DC12 Download Download
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Note: This web page provides an excerpt from a datasheet. Refer to Product Datasheet and other applicable documents for more information.
Models Terminals Contact form Rated coil voltage Model
Coil terminals Contact terminals
Switching type #250 Tab #250 Tab SPST-NO 12 VDC G9EJ-1
Rated voltage Rated current Coil resistance Must-operate voltage Must-release voltage Maximum voltage(See note 3) Power consumption
12 VDC 167 mA 72 Ω 60% max. of rated voltage 5% min. of rated voltage 130% of rated voltage
(at 23°C within 2 minutes)
Approx. 2 W
Note: 1. The figures for the rated current and coil resistance are for a coil temperature of 23°C and have a tolerance of ±10%.
Note: 2. The figures for the operating characteristics are for a coil temperature of 23°C.
Note: 3. The figure for the maximum voltage is the maximum voltage that can be applied to the relay coil.

Item Condenser load
Rated load 25 A at 400 VDC
Maximum switching voltage 400 V
Maximum switching current 25 A

Item G9EJ-1
Contact voltage drop 0.5 V max. (for a carry current of 5 A)
Operate time 50 ms max.
Release time 30 ms max.
Insulation resistance *1 Between coil and contacts 1,000 MΩ min.
Between contacts of the same polarity 1,000 MΩ min.
Dielectric strength Between coil and contacts 2,500 VAC 1 min
Between contacts of the same polarity 2,500 VAC 1 min
Impulse withstand voltage *2 4,000 V
Vibration resistance *3 Destruction 5 to 200 to 5Hz, Acceleration: 44.1 m/s2
Malfunction 5 to 200 to 5Hz, Acceleration: 44.1 m/s2
Shock resistance Destruction 490 m/s2
Malfunction Energized 490 m/s2
Deenergized 98 m/s2
Mechanical endurance *4 200,000 min.
Electrical endurance (condenser load) *5 400 VDC, 25 A, 100,000 ops. min.
Short-time carry current 20 A (1min)
Maximum interruption current(resistive load) 30 A at 400 VDC (100 times min.)
Overload interruption(resistive load) 20 A at 400 VDC (300 times min.)
Ambient operating temperature -40 to 85°C (with no icing or condensation)
Ambient operating humidity 5% to 85%
Weight(including accessories) Approx. 50 g
Note: The above values are initial values at an ambient temperature of 23°C unless otherwise specified.
*1. The insulation resistance was measured with a 500-VDC megohmmeter.
*2. The impulse withstand voltage was measured with a JEC-212 (1981) standard impulse voltage waveform (1.2 × 50 μs).
*3. The Upper limit of double amplitude: 10 mm P-P
*4. The mechanical endurance was measured at a switching frequency of 3,600 operations/hr.
*5. The electrical endurance was measured at a switching frequency of 60 operations/hr.
(Unit: mm)
Terminal Arrangement

Dimension (mm) Tolerance (mm)
10 or lower ±0.3
10 to 50 ±0.5


Take measures to prevent contact with charged parts when using the Relay for high voltages.

Precautions for Correct Use

Refer to the relevant catalog for common precautions.
1. The G9EJ Relays’ contacts have polarity. Be sure to perform connections with the correct polarity. If the contacts are connected with the reverse polarity, the switching characteristics specified in this document cannot be assured.
2. Do not drop or disassemble this Relay. Not only may the Relay fail to meet the performance specifications, it may also result in damage, electric shock, or burning.
3. Do not use these Relays in strong magnetic fields of 800 A/m or higher (e.g., near transformers or magnets). The arc discharge that occurs during switching may be bent by the magnetic field, resulting in flashover or insulation faults.
4. This Relay is a device for switching high DC voltages. If it is used for voltages exceeding the specified range, it may not be possible to interrupt the load and burning may result. In order to prevent fire spreading, use a configuration in which the current load can be interrupted in the event of emergencies. In order to ensure safety of the system, replace the Relay on a regular basis.
5. If the Relay is used for no-load and/or low-load switching, the contact resistance may increase and so confirm correct operation under the actual operating conditions.
6. With this Relay, if the rated voltage (or current) is continuously applied to the coil and contacts, and then turned OFF and immediately ON again, the coil temperature, and consequently the coil resistance, will be higher than usual. This means that the must operate voltage will also be higher than usual, exceeding the rated value ("hot start"). In this case, take the appropriate countermeasures, such as reducing the load current or restricting the energizing time or ambient operating temperature.
7. The ripple percentage for DC relays can cause fluctuations in the must-operate voltage or humming. For this reason, reduce the ripple percentage in full-wave rectified power supply circuits by adding a smoothing capacitor. Ensure that the ripple percentage is less than 5%.
8. Ensure that a voltage exceeding the specified maximum voltage is not continuously applied to the coil. Abnormal heating in the coil may shorten the lifetime of the insulation coating.
9. Do not use the Relay at a switching voltage or current greater than the specified maximum values. Doing so may result in arc discharge interruption failure or burning due to abnormal heating in the contacts.
10.The contact ratings are for resistive loads. The electrical endurance with inductive loads is inferior to that of resistive loads. Confirm correct operation under the actual operating conditions.
11.Do not use the Relay in locations where water, solvents, chemicals, or oil may come in contact with the case or terminals. Doing so may result in deterioration of the case resin or abnormal heating due to corrosion or contamination of the terminals. Also, if electrolyte adheres to the output terminals, electrolysis may occur between the output terminals, resulting in corrosion of the terminals or wiring disconnections.
12.Be sure to turn OFF the power and confirm that there is no residual voltage before replacing the Relay or performing wiring.
13.The distance between crimp terminals or other conductive parts will be reduced and insulation properties will be lowered if wires are laid in the same direction from the contact terminals. Use insulating coverings, do not wire in the same direction, and take other measures as required to maintain insulation properties.
14.Use either a varistor, or a diode plus Zener diode as a protective circuit against reverse surge in the relay coil. Using a diode alone will reduce the switching characteristics.