Product Details Portlet

G9EC-1(-B)-AQ DC Power Relay (200A type)

Capable of Interrupting Highvoltage, High-current Loads

  • A compact relay (L98 x W44x H86.7mm) capable of switching DC400V, 200A. (Capable of interrupting max. DC400V, 1,000A)
  • The switching section and driving section are gas-injected and hermetically sealed, allowing these compact relays to interrupt high-current. The sealed construction also achieves no arc space, space saving, and helps to ensure safe applications. In addition, the contacts have a high contact reliability that is unaffected by ambient atmosphere.
  • Downsizing of parts and optimum design allow no restrictions on the mounting direction.

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

ClassificationTerminal formContact structureRated coil voltageType name
Coil terminalsContact terminals
Switching / current
conduction type
Screw terminalsScrew terminals1aDC12V
Lead wiresG9EC-1-AQ
●Operation coil
Rated voltage(V)Rated current
Coil resistance
Operating voltage
Release voltage
Maximum voltage
Power consumption
DC 1258320.675% or less of rated
8% or more of rated
130% of rated
(at 23°C within
Approx. 7
DC 2429282.3

●Switching area
ItemResistance load
Rated loadDC400V 200A
Rated current200A
Maximum switching voltage400V
Maximum switching current200A

Contact resistance *130 mΩ or less (Typ. 0.2mΩ)
Contact voltage drop0.1V or less (at 200A)
Operating time50 ms or less
Release time30 ms or less
Between coil and contacts1,000 MΩ or more
Between homopolar contacts1,000 MΩ or more
Withstand voltageBetween coil and contactsAC2,500V for 1min.
Between homopolar contactsAC2,500V for 1min.
Vibration toleranceDurability5 to 200 to 5Hz Single amplitude 0.75mm (Acceleration: 2.94 to 88.9m/s2)
Malfunction5 to 200 to 5Hz Single amplitude 0.75mm (Acceleration: 2.94 to 88.9m/s2)
Shock resistanceDurability490m/s2
Mechanical endurance *3200,000 times or more
Electrical endurance (Resistance load) *4DC400V 200A 3,000 times or more
Short time carry current300A (for 15 min)
Maximum interruption currentDC400V 1,000A (10 times)
Overload interruptionDC400V 700A (40 times or more)
Reverse polarity interruptionDC200V -200A (1,000 times or more)
Minimum load current1A
Ambient temperature-40 to +85°C(with no icing or condensation)
Ambient humidity5% to 85%RH
Weight (including accessories)Approx. 650g
Note: All values above are in early time under an ambient temperature of +23°C unless stated.
*1. Measurement condition: By voltage drop method at DC5V 1A.
*2. Measurement condition: By insulation resistance at DC500V.
*3. Test condition / Switching frequency: 3,600 times/hour.
*4. Test condition / Switching frequency: 60 times/hour.
Relay with Screw Terminals G9EC-1-B-AQ
Relay with Lead Wires G9EC-1-B-AQ:Dimensions1

Relay with Lead Wires G9EC-1-AQ
Relay with Lead Wires G9EC-1-AQ:Dimensions1

Correct Use


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

Precautions for Correct Use

1. Be sure to tighten all screws to the appropriate torque given below. Loose screws may result in burning due to abnormal heat generation during energization.
• M8 screws: 8.82 to 9.80 N·m
• M6 screws: 3.92 to 4.90 N·m
• M5 screws: 1.57 to 2.35 N·m
• M4 screws: 0.98 to 1.37 N·m
• M3.5 screws: 0.75 to 1.18 N·m
2. The G9EA, G9EC, G9ED and G9EH Relays' contacts have polarity.Be sure to perform connections with the correct polarity. If thecontacts are connected with the reverse polarity, the switching characteristics specified in this document cannot be assured.
3. 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.
4. 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 flash over or insulation faults.
5. 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.
6. If the Relay is used for no-load switching, the contact resistance may increase and so confirm correct operation under the actual operating conditions.
7. These Relays contain pressurized gas. Even in applications with low switching frequencies, the ambient temperature and heat caused by arc discharge in the contacts may allow permeation of the sealed gas, resulting in arc interruption failure.In order to ensure safety of the system, replace Relays on a regular basis.
8. Do not use or store the Relay in a vacuum. Doing so will accelerate deterioration of the sealing.
9. 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.
10.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%.
11.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.
12.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.
13.The contact ratings are for resistive loads. The electrical endurancewith inductive loads is inferior to that of resistive loads. Confirm correct operation under the actual operating conditions.
14.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.
15.Be sure to turn OFF the power and confirm that there is no residual voltage before replacing the Relay or performing wiring.
16.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.
17.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.
18.Be sure to use the screws provided with the product for wiring coil terminals and contact terminals. The specified tightening torque cannot be achieved with different screws and may result in abnormal heat generation when energized.

Recommended Wire Size
Model                Size
G9EB-1-B-AQ : 5.5 mm2 min.
G9EA-1(-B)-AQ: 15 mm2 min.
G9ED-1(-B)-AQ: 38 mm2 min.
G9EC-1(-B)-AQ: 60 mm2 min.
G9EH-1:100 mm2 min.
*Note: Use flexible leads.