Product Details Portlet

G5NB PCB Power Relay

A Miniature Relay with 1-pole 3A/5A Switching Capability and 10 kV Impulse Withstand Voltage

  • Highly efficient magnetic circuit for high sensitivity (200 mW).
  • Small, yet provides 10-kV impulse withstand voltage (between coil and contacts).
  • Standard model conforms to UL/CSA/VDE standards.
  • Satisfies EN61010 reinforced insulation requirements.
  • IEC/EN 60335-1 conformed. (-HA Model)
  • IEC/EN 60079-15 conformed. (Only for G5NB-1A4, G5NB-1A4-E Model)
  • Enable Smaller PCB Designs
    PCB Power Relays Type G5NB, Type G5Q
    Introduction of G5NB and G5Q

    Circuit designers face the constant challenge of shrinking PCB designs.
    Now, with OMRON G5NB and G5Q slim power relays, small PCB designs can be easier to create than ever.

RoHS Compliant
Model 2D/3D CAD
G5NB-1A Download
G5NB-1A-CF Download
G5NB-1A-CF-PW Download
G5NB-1A-HA Download
G5NB-1A-HA-CF Download
G5NB-1A-HA-CF-PW Download
G5NB-1A-HA-PW Download
G5NB-1A-PW Download
Note: This web page provides an excerpt from a datasheet. Refer to Product Datasheet and other applicable documents for more information.

Ordering Information

Terminal Shape Market Code Classification Contact form Enclosure ratings Model Rated coil voltage Minimum
packing unit
PCB terminals General purpose Standard SPST-NO (1a) Flux protection G5NB-1A(-SP) 5VDC
100 pcs/Tray
(50 pcs/tube)
Sealed G5NB-1A4(-SP)
Flux protection G5NB-1A-CF(-SP) 5VDC
High-capacity G5NB-1A-E(-SP) 5VDC
Sealed G5NB-1A4-E(-SP)
Home Appliance Standard Flux protection G5NB-1A-HA(-SP) 5VDC
High-capacity G5NB-1A-E-HA(-SP) 12VDC



Rated voltage Rated current
Coil resistance
Must operate voltage
Must release voltage
Max. voltage
Power consumption
% of rated voltage
5 VDC 40 125 75% max 10% min. 10 to 31%
  • Standard: 180% (at 23°C)
  • High-capacity: 170% (at 23°C)
Approx. 200
Approx. 32
12 VDC 16.7 720
18 VDC 11.1 1,620
24 VDC 8.3 2,880


Resistive load
Contact Type Single
Contact material Ag-alloy (Cd free)
Rated load 3 A at 125 VAC 5 A at 250 VAC
3 A at 30 VDC 3 A at 30 VDC
Rated carry current 3 A 5 A
Max. switching voltage 250 VAC, 30 VDC
Max. switching current 3 A 5 A


Contact resistance∗1 100 mΩ max.
Operate time 10 ms max.
Release time 10 ms max.
Insulation resistance∗2 1,000 MΩ min. (at 500 VDC)
Dielectric strength Between coil and contacts 4,000 VAC, 50/60 Hz for 1 min
Between contacts of the same polarity 750 VAC, 50/60 Hz for 1 min
Impulse withstand voltage Between coil and contacts 10 kV (1.2 x 50 νs)
Vibration resistance Destruction 10 to 55 to 10 Hz, 0.75 mm single amplitude
(1.5 mm double amplitude)
Malfunction 10 to 55 to 10 Hz, 0.75 mm single amplitude
(1.5 mm double amplitude)
Shock resistance Destruction 1,000 m/s2
Malfunction 100 m/s2
Durability Mechanical 5,000,000 operations min.
Electrical Standard (G5NB-1A, -1A4)
  • 200,000 operations at 125 VAC, 3A
  • 200,000 operations at 30 VDC, 3A
High-capacity (G5NB-1A-E, -1A4-E)
  • 100,000 operations at 250 VAC, 5A
  • 200,000 operations at 30 VDC, 3A
    (with a rated load at 1,800 operations/hour)
Failure rate (P level) (reference value)∗3 DC5V 10mA
Ambient operating temperature∗4 -40°C to 85°C (with no icing or condensation)
Ambient operating humidity 5% to 85%
Weight Approx. 4 g

Other data

Creepage distance 6.0 mm min.
Clearance distance 6.0 mm min.
Insulation Material Group III a
Type of insulation coil-contact circuit
  • Pollution degree 2 / Reinforced (Sealed)
    Pollution degree 3 / Basic (Flux protection) / Reinforced (Sealed)
  • Micro disconnection
open contact circuit
Rated Insulation Voltage 250V
Pollution degree 3
Rated voltage system 250V
Overvoltage category III
Category of protection according to IEC 61810-1 RT II (Flux protection) / RT III (Sealed)
Glow wire according to IEC 60335-1 < HA Models only >
GWT 750°C min. (IEC 60695-2-11) / GWFI 850°C min. (IEC 60695-2-12)
Tracking Index of relay base PTI 250V min. (housing parts)
Flammability class according to UL94 V-0


(Unit: mm)

G5NB-1A(4)(-E), G5NB-1A-E-HA

  • Dimensions: G5NB-1A(4)(-E), G5NB-1A-E-HA

    ∗ Average value

  • PCB Mounting Holes (BOTTOM VIEW)

    Tolerance: ±0.1 mm

    PCB Mounting Holes
    Terminal Arrangement / Internal Connections
    Terminal Arrangement / Internal Connections

    (No coil polarity)


Please refer to “PCB Relays Common Precautions” for correct use.

Correct Use

Coil Voltage Reduction (Holding Voltage) after Relay Operation
  • If the coil voltage is reduced to the holding voltage after Relay operation, first apply the rated voltage to the coil for at least 100 ms, as shown below.
  • A voltage of at least 40% of the rated voltage is required for the coil holding voltage. Do not allow voltage fluctuations to cause the coil holding voltage to fall below this level.
Coil Voltage Reduction (Holding Voltage) after Relay Operation
  Applied coil voltage Coil resistance Power consumption
Rated voltage 100% 125Ω (5 VDC)
720Ω (12 VDC)
2880Ω (24 VDC)
Approx. 200 mW
Holding voltage 40% Approx. 32 mW