Omron G9SA-301, G9SA-501, G9SA-321-T075, G9SA-321-T15, G9SA-321-T30 Datasheet

Safety Relay Unit

G9SA

• Four kinds of 45-mm wide Units are
available:
A 3-safety contact model, a 5-safety
contact model, and models with 3 safe­ty contacts and 2 OFF-delay safety
contacts.
Also available are 17.5-mm wide Ex­pansion Units with 3 safety contacts
and 3 OFF-delay safety contacts.

• Two hand controller (type III C, EN 574)

• Simple expansion connection.

• OFF-delay models have 15-step OFF­delay settings.

• Conforms to EN standards. (BG ap­proval)

• Approved by UL and CSA.

• Both DIN track mounting and screw
mounting are possible.

• Suitable for PNP OSSD outputs of
safety sensors, F3SN, F3SH, F3S-B,
F3S-TGR, F3SL

The G9SA Series Offers a Complete
Line-up of Compact Units.

Ordering Information

Emergency-stop Units

Main contacts Auxiliary contact Number of input channels Rated voltage Model Category

3PST-NO SPST-NC 1 channel or 2 channels possible

5PST-NO SPST-NC 1 channel or 2 channels possible

Emergency-stop OFF-delay Units

Main contacts

3PST-NO DPST-NO SPST-NC

Note: The following 15-step OFF-delay time settings are available:

T075: 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, and 7.5 s
T15: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 s
T30: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30 s

Two-hand Controller

Main contacts Auxiliary contact Number of input channels Rated voltage Model Category

3PST-NO SPST-NC 2 channels

Expansion Unit

The Expansion Unit connects to a G9SA-301, G9SA-501, G9SA-

Main contacts Auxiliary contact Model Category

OFF-delay

contacts

3PST-NO SPST-NC G9SA-EX301 4

Auxiliary

contact

Number of

input channels

1 channel

or 2 channels

possible

OFF-delay

time

7.5 s

15 s

30 s

24 VAC/VDC

100 to 240 VAC

24 VAC/VDC

100 to 240 VAC

Rated voltage Model Category

24 VAC/VDC

100 to 240 VAC

24 VAC/VDC

100 to 240 VAC

24 VAC/VDC

100 to 240 VAC

24 VAC/VDC

100 to 240 VAC

321, or G9SA-TH301.

G9SA-301

G9SA-501

G9SA-321-T075

G9SA-321-T15

G9SA-321-T30

G9SA-TH301 4 (IIIc, EN574)

Main contacts:

4

4

OFF-delay

contacts:

3

G9SA

G-109G9SA

Expansion Units with OFF-delay Outputs

The Expansion Unit connects to a G9SA-301, G9SA-501, G9SA-321, or G9SA-TH301.

Main contact form Auxiliary contact OFF-delay time Model Category

7.5 s G9SA-EX031-T075

3PST-NO SPST-NC

30 s G9SA-EX031-T30

Note: The following 15-step OFF-delay time settings are available:

T075: 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, and 7.5 s
T15: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 s
T30: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30 s

Model Number Legend

315 s G9SA-EX031-T15

G9SA-######-####

1 2 3 4 5 6

1. Function

None: Emergency stop
EX: Expansion Unit
TH: Two-hand Controller

2. Contact Configuration (Safety Output)

0: None
3: 3PST-NO
5: 5PST-NO

3. Contact Configuration (OFF-delay Output)

0: None
2: DPST-NO
3: 3PST-NO

4. Contact Configuration (Auxiliary Output)

0: None
1: SPST-NC

5. Input Configuration (for G9SA-301/501/321)

None: 1-channel or 2-channel input possible

6. OFF-delay Time (Max. setting time)

None: No OFF-delay
T075: 7.5 seconds
T15: 15 seconds
T30: 30 seconds

G-110 Safety Sensors / Components

Specifications

Ratings

Power Input

Item G9SA-301/TH301 G9SA-501 G9SA-321-T#

Power supply voltage

Operating voltage range 85% to 110% of rated power supply voltage
Power consumption

(See note.)

Note: When an Expansion Unit is connected, the power consumption is increased by 2 VA/2 W max.

Inputs

Item G9SA-301/321-T#/TH301 G9SA-501

Input current (See note.) 40 mA max. 60 mA max.

Note: When an Expansion Unit is connected, the input current is increased by 30 mA max.

Contacts

Item

Rated load 250 VAC, 5 A
Rated carry current 5 A

Characteristics

Item G9SA-301/TH301 G9SA-501/321-T# G9SA-EX301/EX031-T#
Contact resistance (see note 1) 100 mΩ
Operating time 30 ms max. (not including bounce time)
Response time (see note 2) 10 ms max. (not including bounce time)
Insulation resistance (see note 3) 100 MΩ min. (at 500 VDC)

Between different outputs

Dielectric
strength

Vibration resistance 10 to 55 Hz, 0.75-mm double amplitude
Shock

resistance

Durability

Minimum permissible load (reference value) 5 VDC, 1 mA

Ambient temperature

Ambient humidity

Terminal tightening torque 0.98 N·m
Weight (see note 4) Approx. 210 g Approx. 270 g
Approved standards EN954-1, EN60204-1, EN574 (-TH301), UL508, CSA C22.2 No. 14

EMC

Between inputs and outputs
Between power inputs and outputs
Between power inputs and other inputs

(only for 100 to 240-V models)

Destruction 300 m/s
Malfunction 100 m/s
Mechanical 5,000,000 operations min. (at approx. 7,200 operations/hr)
Electrical 100,000 operations min. (at approx. 1,800 operations/hr)

24 VAC/VDC:24 VAC, 50/60 Hz, or 24 VDC
100 to 240 VAC:100 to 240 VAC, 50/60 Hz

24 VAC/VDC: 1.8 VA/1.7 W max.
100 to 240 VAC: 9 VA max.

G9SA-301/501/321-T#/TH301/EX301/EX031-T#

Resistive load (cos φ =1)

2,500 VAC, 50/60 Hz for 1 min

Operating:-25°C to 55°C (with no icing or condensation)
Storage:-25°C to 85°C (with no icing or condensation)

Operating:35% to 85%
Storage:35% to 85%

EMI: EN55011 group 1 class A
EMS: EN50082-2 group 1

24 VAC/VDC: 2.8 VA/2.6 W max.
100 to 240 VAC: 11 VA max.

2

2

24 VAC/VDC: 3.5 VA/3.3 W max.
100 to 240 VAC: 12.5 VA max.

Approx. 130 g

G9SA

Note: 1. The contact resistance was measured with 1 A at 5 VDC using the voltage-drop method.

2. The response time is the time it takes for the main contact to open after the input is turned OFF.

3. The insulation resistance was measured with 500 VDC at the same places that the dielectric strength was checked.

4. Weight shown is for 24-VAC/VDC type. For 100 to 240-VAC type, add approximately 20 g.

G-111G9SA

Application Examples

G9SA-301 (24 VAC/VDC) with 2-channel Limit Switch Input/Auto-reset

Feedback loop

Open

Timing Chart

Limit switches
S1 and S2

K1 and K2
(NC)

K1 and K2
(NO)

KM1 and KM2
(NC)

KM1 and KM2
(NO)

Control
circuit

G9SA-301 (24 VAC/VDC) with 2-channel Limit Switch Input/Manual-reset

Feedback loop

Open

S1: Safety Limit Switch

S2: Limit switch
KM1 and KM2: Magnetic Contactor
M: 3-phase motor

Note: This circuit achieves EN954-1

Safety Category 4.

with direct opening mechanism
(D4N or D4B)

Timing Chart

Limit switches
S1 and S2

Reset switch
S3

K1 and K2
(NC)

K1 and K2
(NO)

KM1 and KM2
(NC)

KM1 and KM2
(NO)

PC input

PC output

KM3

Control
circuit

G-112 Safety Sensors / Components

S1: Safety Limit Switch

S2: Limit switch
S3: Reset switch
KM1 and KM2: Magnetic Contactor
KM3: Solid-state Contactor
M: 3-phase motor

Note: This circuit achieves EN954-1

with direct opening mechanism
(D4N or D4B)

Safety Category 4.

G9SA-301 (100 to 240 VAC) with 2-channel Limit Switch Input/Auto-reset

Limit switches
S1 and S2

K1 and K2
(NC)

K1 and K2

Feedback loop

Open

(NO)
KM1 and KM2

(NC)
KM1 and KM2

(NO)

Timing Chart

Control
circuit

S1: Safety Limit Switch

S2: Limit switch
KM1 and KM2: Magnetic Contactor
M: 3-phase motor

Note: This circuit achieves EN954-1

with direct opening mechanism
(D4N or D4B)

Safety Category 4.

G9SA-301 (24 VAC/VDC) with 2-channel Emergency Stop Switch Input/Manual-reset

Timing Chart

Emergency
stop switch S1

Reset switch
S2

Feedback loop

K1 and K2
(NC)
K1 and K2
(NO)

KM1 and KM2
(NC)

KM1 and KM2
(NO)

PC input

PC output

KM3

Control
circuit

S1: Emergency stop switch

S2: Reset switch
KM1 and KM2: Magnetic Contactor
KM3: Solid-state Contactor
M: 3-phase motor

Note: This circuit achieves EN954-1

with direct opening mechanism
(A165E or A22E)

Safety Category 4.

G9SA

G-113G9SA

G9SA-321-T# (24 VAC/VDC) with 2-channel Limit Switch Input/Manual-reset

Feedback loop

Open

S1: Safety Limit Switch

S2: Limit switch
S3: Reset switch
KM1 and KM2: Magnetic Contactor
M: 3-phase motor

with direct opening mechanism
(D4N or D4B)

Timing Chart

Limit switches
S1 and S2

Reset switch
S3

K1 and K2
(NC)

K1 and K2
(NO)

K3 and K4
(NC)

K3 and K4
(NO)

KM1 and KM2
(NC)

KM1 and KM2
(NO)

Operation
instruction

Motor rotation

OFF-delay time

Off delay
timer

Control
circuit

Operation
instruction

Note: This circuit achieves EN954-1 Safety Category 4.

The OFF-delay output, however, achieves EN954-1
Safety Category 3.

Motor controller

G-114 Safety Sensors / Components

G9SA-321-T# (24 VAC/VDC) + G9SA-EX031-T# with 2-channel Limit Switch Input/Manual-reset

Feedback loop

Open

Off delay

Off delay
timer

Control
circuit

timer

S1: Safety Limit Switch

S2: Limit switch
S3: Reset switch
KM1, KM2,
KM3, and KM4: Magnetic Contactor
M1, M2: 3-phase motor

with direct opening mechanism
(D4N or D4B)

Timing Chart

Limit switches
S1 and S2

Reset switch
S3

G9SA-321-T#
K1 and K2 (NC)

G9SA-321-T#
K1 and K2 (NO)

G9SA-321-T#
K3 and K4 (NC)

G9SA-321-T#
K3 and K4 (NO)

KM1 and KM2
(NC)
KM1 and KM2
(NO)

Operation
instruction

Motor M1
rotation

G9SA-EX031
K1 and K2 (NC)

G9SA-EX-031
K1 and K2 (NO)

KM3 and KM4
(NC)

KM3 and KM4
(NO)

Operation
instruction
Motor M2
rotation

OFF-delay time 1

OFF-delay time 2

Operation
instruction

Operation
instruction

Note: This circuit achieves EN954-1 Safety Category 4.

The OFF-delay output, however, achieves EN954-1
Safety Category 3.

Motor controller

Motor controller

G9SA

G-115G9SA

G9SA-301 (24 VAC/VDC) with 2-channel Safety Area Sensor/Manual-reset

Timing Chart

F3SN-A Incident
Interrupted

Reset switch S1
K1 and K2

(NC)
K1 and K2
(NO)

KM1 and KM2
(NC)

KM1 and KM2
(NO)

PC input

PC output

KM3

F3SN-A: Safety area sensor
S1: Reset switch
KM1 and KM2: Magnetic Contactor
KM3: Solid-state Contactor
M: 3-phase motor
E1: 24-VDC Power Supply

Note: This circuit achieves EN954-1

Safety Category 4.

Feedback loop

Shield

Emitter Receiver

F3SN-A
F3SH-A

RS-485(A) (Gray)

RS-485(B) (Pink)

(Red)

Open

EDM input (Red)

0V (Blue)

Interlock selection

input (White)

Reset input (Yellow)

Test input (Green)

Open

+24V (Brown)

+24V (Brown)

Auxiliary (Yellow)

Open

OSSD2 (White)

OSSD1 (Green)

Open

Shield

0V (Blue)

KM3

E1

Control
circuit

G-116 Safety Sensors / Components

G9SA-TH301 (24 VDC) with 2-hand Inputs/Auto-reset

(See note 1.)

Feedback loop

Control circuit

Timing Chart

S11 (NC)

S11 (NO)

S12 (NC)

S12 (NO)
KM1 and KM2

(NC)
KM1 and KM2

(NO)

Input time difference operates only
when the difference is 0.5 s max.

S11, S12: Two-hand pushbutton switches
KM1 and KM2: Magnetic Contactor

Note: 1. Use a 1NC+1NO switch for S11

and S12.

2. This circuit achieves EN954-1

Safety Category 4.
Typ III C (EN 574)

0.5 s max.

G9SA

G-117G9SA

G9SA-501 (24 VAC/VDC) and G9SA-EX301 with 2-channel Limit Switch Input/Manual-reset

Feedback loop

Open

Control
circuit

S1: Safety Limit Switch

S2: Limit switch
S3: Reset switch
KM1 and KM2: Magnetic Contactor
M: 3-phase motor

with direct opening mechanism
(D4N or D4B)

Timing Chart

Limit switches S1
and S2

Reset switch
S3
G9SA-501
K1, K2, K3 and
K4 (NC)
G9SA-501
K1, K2, K3, and
K4 (NO)
G9SA-EX301
K1 and K2 (NC)

G9SA-EX301
K1 and K2 (NO)

KM1 and KM2
(NC)

KM1 and KM2
(NO)

Note: This circuit achieves EN954-1 Safety Category 4.

G-118 Safety Sensors / Components

Dimensions

Note: All units are in millimeters unless otherwise indicated. The diagrams are drawn in perspective.

G9SA-301
G9SA-501
G9SA-321-T#
G9SA-TH301

76 max.

4.6 dia.

G9SA-301 G9SA-TH301

G9SA-301: Twenty, M3
G9SA-501: Twenty-four, M3
G9SA-321-T#: Twenty-four, M3
G9SA-TH301: Twenty-one, M3

OFF-delay time
setting switch
(see note)

Connector cover

Terminal Arrangement

G9SA-501
G9SA-321-T#

OFF­delay
time
setting
switch
(see
note)

Mounting Holes

Two, 4.2 dia. or M4

C
D

Note: The OFF-delay time setting switch is

found on the G9SA-321-T# only.

G9SA-EX301
G9SA-EX031-T#

45 max.

76 max.

4.6 dia.

Eight, M3

OFF-delay time
setting switch
(see note)

111 max.

Mounting Holes

Two, 4.2 dia. or M4

Terminal Arrangement

G9SA-EX301
G9SA-EX031-T#

OFF-delay time
setting switch
(see note)

G9SA

Note: The OFF-delay time setting switch is

found on the G9SA-EX031-T# only.

17.5 max.

111 max.

G-119G9SA

Installation

Internal Connections

G9SA-301 (24 VAC/VDC)

T11

A1 A2

T12 T31

a

K2

K1

K1

b

K2

6

T23

T21

PE

T22

(See note 3.) (See note 1.)

G9SA-501 (24 VAC/VDC)

T11 T12

A1 A2

K1

a

K1

K3

6

T21

PE

(See note 3.) (See note 1.)

G9SA-321-T# (24 VAC/VDC)

A1 A2

T11 T12

a

K1

K2

K1

b

K2

6

T23

PE

T21

(See note 3.) (See note 1.)

G9SA-TH301 (24 VAC/VDC)

A1 A2

T11 T12 T31 T32T13

1

6

T23 T21 T22

PE

(See note 2.)

G9SA-EX301

12 5 4

1
2
3
4
5
6

K1
K2

K1 K2

36

G9SA-EX031-T#

1

5

2

K2

1
2
3
4
5
6

Off delay
timer

K1

6

1

a

Control
circuit

b

AB 14

K2

b

K2

T23

T22

K3

K4

T22

Control circuit

CD

13 23 33 41

14 24 34 42

13 23 33 41

4

K1

K2

3

142434

T32

K1
K2

K4

a
b

Off delay
timer

K2

3
4

2

2
5

5

T31 T32

1

Control
circuit

AB

K1

K1

42

13 23 33 41

JP

34

24

42

13 23 33 43 53 61

3

K3

K4

4

2

K1

5

K2

142434

T31

T32

K3

a

K4

2

Control

5

circuit

b

AB 142434

13 23 33 41

K2

3
4

2
5

142434

1
2
3
4
5
6

44 54 62

13 23 33 43 53 61

3
4

K1

K2

JP

42

1
2
3
4
5
6

G9SA-301 (100 to 240 VAC)

(See note 3.)(See note 1.)

G9SA-501 (100 to 240 VAC)

1
2
3
4
5

JP

6

(See note 3.)(See note 1.)

G9SA-321-T# (100 to 240 VAC)

1
2
3
4
5

JP

6

44 54 62

(See note 3.) (See note 1.)

G9SA-TH301 (100 to 240 VAC)

Control circuit

(See note 2.)

Note: 1. Use terminals A and B to switch reset mode.

A to B open: Manual reset
A to B closed: Auto-reset

2. Use terminals C and D to switch input conditions.

C to D open: DPDT input.
C to D closed: DPST-NC input. (Make sure T11 and
T21 are open.)

3. Use terminal T23 with + common 2-channel input.

When using T23, make sure that T21 and T22 are
open. For 1-channel input, make sure T12 and T23 are
closed.

4. With 100 to 240-VAC type, be sure to connect PE to a

protective ground. With 24-VAC/VDC type, if the power
supply is not connected to a protective ground, be sure
to connect PE to a protective ground.

5. With 24-VAC/VDC type, the power supply terminals A1

and A2 have polarities. A2 is the negative pole.

Control
circuit

Control
circuit

Off delay
timer

Control
circuit

G-120 Safety Sensors / Components

Precautions

Do not touch the terminal area of the Relays or the socket terminal
area (charged area) while power is ON. Electric shock will result.

Wiring

Turn OFF the G9SA before wiring the G9SA. Do not touch the termi­nals of the G9SA while the power is turned ON, because the termi­nals are charged and may cause an electric shock.

Use the following to wire the G9SA.
Stranded wire: 0.75 to 1.5 mm
Solid wire: 1.0 to 1.5 mm

Tighten each screw to a torque of 0.78 to 1.18 N·m, or the G9SA
may malfunction or generate heat.

External inputs connected to T11 and T12 or T21 and T22 of the
G9SA-301 must be no-voltage contact inputs.

PE is a ground terminal.
When a machine is grounded at the positive, the PE terminal should

not be grounded.

2

2

Mounting Expansion Units

Turn OFF the G9SA before connecting the Expansion Unit.
When an Expansion Unit is being used, remove the connector cover

from the G9SA Safety Relay Unit (G9SA-301, G9SA-501, G9SA­321#, or G9SA-TH301) and insert the connector of the Expansion
Unit’s connector cable.

Applicable Safety Category (EN954-1)

G9SA-series Relays meet the requirements of Safety Category 4 of
the EN954-1 standards when they are used as shown in the exam­ples provided by OMRON. The Relays may not meet the standards
in some operating conditions. The OFF-delay output of models
G9SA-321-T# and EX031-T#, however, conform to Safety Category

3.
The applicable safety category is determined from the whole safety

control system. Make sure that the whole safety control system
meets EN954-1 requirements.

Mounting Multiple Units

When mounting multiple Units close to each other, the rated current
will be 3 A. Do not apply a current higher than 3 A.

Connecting Inputs

If using multiple G9SA models, inputs cannot be made using the
same switch. This is also true for other input terminals.

G9SA G9SA

Earth Short

A positive thermistor is built into the G9SA circuits, so you can detect
earth short breakdowns and breakdown shorts between channel 1
and channel 2. If the short breakdown is canceled, reset is auto­matic.

G9SA

G-121G9SA

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

Cat. No. J121-E2-03A-X

In the interest of product improvement, specifications are subject to change without notice.

G-122 Safety Sensors / Components