EB3C Relay Barriers
Input contacts can be used in any explosive gas and Zone 0/Class I Div. 1 areas.
Explosion
protection

Relay Barrier:
Switch (EB9Z-A):
Switch (EB9Z-A1):[Ex ia Ga] II C
Exia II CT6
Exia II BT6• IEC60079 compliant.
• Wide variety of models ranging from 1-circuit to 16 circuit models.
• 8- and 16-channel are available in common wiring, ideal for connection to
PLCs. 16-circuit also available with a connector.
• No grounding required.
• IDEC’s original spring-up terminal minimizes wiring time.
• 35-mm-wide DIN rail mounting or direct screw mounting.
• Global usage
IECEx
North America: FM, UL, c-UL
Europe: CE marking, ATEX, UKCA
China:
EX-CCC
Korea: KCS
TaiwanTS
Japan:DEKRA• Ship class: NK (Japan), KR (Korea)

Connector Model

Relay Barriers
Power
Voltage

Package quantity:1
Connection to
Non-intrinsically
Safe Circuit

Number of
Channels

OutputRelay

100 to 240V AC
Transistor (Sink/Source)

Transistor (Sink)
Transistor (Source)
Screw Terminal

Relay

24V DC
Transistor (Sink/Source)

Sink
Transistor
Connector

SourceSink
Source

1
2
3
5
6
8 (*)
10
8
1
2
3
5
6
8
10
8 (*)
16 (*)
8 (*)
16 (*)
1
2
3
5
6
8
8 (*)
10
16 (*)
1
2
3
5
6
8
10
8 (*)
16 (*)
8 (*)
16 (*)
16 (*)Part No.

Weight (g)EB3C-R01AN
EB3C-R02AN
EB3C-R03AN
EB3C-R05AN
EB3C-R06AN
EB3C-R08AN
EB3C-R10AN
EB3C-R08CAN
EB3C-T01AN
EB3C-T02AN
EB3C-T03AN
EB3C-T05AN
EB3C-T06AN
EB3C-T08AN
EB3C-T10AN
EB3C-T08CKAN
EB3C-T16CKAN
EB3C-T08CSAN
EB3C-T16CSAN
EB3C-R01DN
EB3C-R02DN
EB3C-R03DN
EB3C-R05DN
EB3C-R06DN
EB3C-R08DN
EB3C-R08CDN
EB3C-R10DN
EB3C-R16CDN
EB3C-T01DN
EB3C-T02DN
EB3C-T03DN
EB3C-T05DN
EB3C-T06DN
EB3C-T08DN
EB3C-T10DN
EB3C-T08CKDN
EB3C-T16CKDN
EB3C-T08CSDN
EB3C-T16CSDN
EB3C-T16CKD-CN
EB3C-T16CSD-CN

150
180
190
260
270
300
380
280
140
170
180
250
260
320
340
260
260
260
260
130
170
180
250
260
260
270
360
390
120
160
170
240
250
250
320
250
350
250
350
330
330

Note: Models marked with (*) are for common wiring only.
The transistor output sink model can be connected to a positive common PLC input module.
The transistor output source model can be connected to a negative common PLC input module.

1

EB3C Relay Barriers

Accessories
Name
DIN Rail
End Clip
Static Electricity Caution Plate

Part No.
BAA1000
BNL6
EB9Z-N1

Ordering No.
BAA1000PN10
BNL6PN10EB9Z-N1PN10

Package Quantity
10
10
10

Description
Aluminum (1m long)
For fastening EB3C units on the DIN rail.
Polyester 20 (W) x 6 (H) mm

Explosion-Protection and Electrical Specifications

Certification No.

Explosion Protection
Degree of Protection

Intrinsic safety type
IP20 (IEC 60529)
Safe indoor place(safe area: non-hazardous area)
For zone 0, 1, 2

Certification
Organization

250V AC (UL: 125V)

UL
c-UL

Installation Location

Relay Barrier

SwitchNon-intrinsically Safe Circuit
Maximum Voltage (Um)Intrinsically Safe Circuits

Wiring Method
Rated Operating Voltage
Rated Operating Current
Maximum Output Voltage (Uo)Maximum Output Current (lo)Maximum Output Power (Po)Maximum External
Capacitance (Co)Maximum External
Inductance (Lo)Allowable Wiring Resistance (Rc)
Maximum Channels per
Common Line
Contact Configuration
Rated Insulation Voltage (Ui)

Relay Output

Resistive Load
Rated Load

Inductive Load

Minimum Applicable Load
Contact ResistanceTurn ON Time
Turn OFF Time
Mechanical Life
Electrical Life

Transistor Output

Non-intrinsically Safe Circuits

Thermal Current (lth)
Resistive Load
Contact
Allowable
Inductive Load
Power

Short-circuit Protection
Rated Voltage
Maximum Voltage
Maximum Current
Leakage Current
Voltage Drop
Inrush Current
Turn ON Time
Turn OFF Time
Short-circuit Protection

1-channel
Separate Wiring
12V DC ±10%10 mA DC ±20%13.2V DC14.2 mA
46.9 mW

16-channel
Common Wiring

470 nF490 nF88.0 mH

0.6 mH

300Ω

600/(N+1)Ω
(N = number ofcommon channels)—

FM

DEKRA (IECEx)
DEKRA (ATEX)

227.2 mA
750 mW

16

1NO
250V AC, 125V DC(UL: 125V AC, 24V DC)
3A (common terminal: 8A)
AC: 750 VA (UL: 375 VA), DC: 72W
AC: 750 VA (UL 375 VA)(cos ø = 0.3 to 0.4)
DC: 48W (L/R = 7 ms)
250V AC (UL: 125V AC) 3A, 24V DC 3A
250V AC (UL: 125V AC) 3A (cos ø = 0.3 to 0.4)
24V DC 2A (L/R = 7 ms)
0.1V DC, 0.1mA (reference value)
50mΩ maximum (initial value)
12ms maximum (rated voltage)
10ms maximum (rated voltage)
20,000,000 operations minimum(at 18,000 operations/hour, without load)
100,000 operations minimum(at 1,800 operations/hour, at rated resistive load)
None
24V DC
30V DC
100mA (connector model: 15 mA)
0.1mA maximum
1.5V maximum (operating temperature: 25°C)
0.5A maximum (1 sec)
0.1ms maximum (resistive load)
0.4ms (typical) (resistive load)
None

CSA (UKCA)
CQC (Ex-CCC)

KCs (Korea)
DEKRA (Japan)
TS (Taiwan)
NK (Japan)
KR (Korea)
TIIS (Japan)

AIS Class I, II, III Division 1,
Groups A, B, C, D, E, F, GAIS Zone 0, 1 [AEx ia Ga] II C, II B, II A
Class I, II, III Division 1,
Groups A, B, C, D, E, F, G
Class I, Zone 0 [AEx ia Ga] II C
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
II (1) G [Ex ia Ga] II C: Gas, Vapour
II (1) D [Ex ia Da] III C: Dust
II (1) G [Ex ia Ga] II C: Gas, Vapour
II (1) D [Ex ia Da] III C: Dust
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
[Ex ia Ga] II C: Gas, Vapour[Ex ia Da] III C: Dust
Switch (EB9Z-A): Ex ia IIC T6
Switch (EB9Z-A1): Ex ia IIB T6

Certification No.
FM22US0085X

E234997
IECEx DEK 21.0070
DEKRA 21ATEX0103
CSAE 22UKEX1312
2020012316310050

14-AV4BO-0373
14-AV4BO-0374
DEK21.0084
TD04010Z
TA22539M
TKY17821-EL003
TC15758
TC15961• Switches are not certified except by TIIS (Technology Institution of Industrial Safety,
Japan).
For details on switches, see “Switch Explosion-Protection Specifica­tions” on page 3 and“3. Switches in the Hazardous Area” on page 7.
• Certificaton bodies, explosion-proof performance, and approval/certification numbers are
subject to change due to revisions of standards or updates by certification bodies.
For the latest information, contact IDEC.
• For FM, UL, and c-UL explosion-proof approved models, add “-2” to the end of the part number.
“-2” is not added to the ordering number.
Example of part numbers that represent FM, UL, and c-UL certification: EB3C-R01AN-2
Example of ordering part number: EB3C-R01AN

General Specifications
Power Voltage
Rated Power Voltage
Allowable Voltage Range
Rated Frequency
Inrush Current

Dielectric Strength(1 minute, 1 mA)
Operating Temperature
Operating Humidity
Storage Temperature
Atmosphere
Pollution Degree
Insulation ResistanceVibration Resistance(damage limits)
Shock Resistance(damage limits)
Terminal Style
Mounting
Power Consumption(approx.)2Explosion Protection

AC Power
DC Power
100 to 240V AC
24V DC (UL: When using Class 2(UL: 100 to 120V AC)
power supply)–15 to +10%
±10%50/60 Hz—(allowable range: 47 to 63 Hz)
10A (100V AC)
10A (24V DC)
20A (200V AC)
Between intrinsically safe circuit and non-intrinsically safe
circuit: 1527V AC
Between AC power and output terminal: 1500V AC
Between DC power and transistor output terminal:
1000V AC (screw terminal model only)–20 to +60°C (no freezing)
45 to 85% RH (no condensation)–20 to +60°C (no freezing)
800 to 1100 hPa
2 (IEC 60664)
10 MΩ minimum (500V DC megger, between the same poles as
the dielectric strength)
Panel mounting: 10 to 55 Hz, amplitude 0.75mm
DIN rail mounting: 10 to 55 Hz, amplitude 0.35mm
Panel mounting: 500 m/s2 (3 times each on X, Y, Z)
DIN rail mounting: 300 m/s2 (3 times each on X, Y, Z)
M3 screw terminal
35mm-wide DIN rail or panel mounting (M4 screw)
9.6 VA (EB3C-R10AN at 200V AC)
4.8W (EB3C-R16CDN at 24V DC)

EB3C Relay Barriers

Switch Explosion-Protection Specifications (Japan only)
Simple apparatuses in accordance with relevant standards of each country can be installed in the hazardous area and connected to the EB3C located in the safe area.
In Japan, any switches, though regarded as simple apparatuses, must be certified for explosion-proof devices. EB9Z-A and EB9Z-A1 are IDEC’s generic Part No. of
any single apparatuses certified by TIIS for use with the EB3C, therefore simple appa­ratuses with specifications shown below can be used as those approved by theJapanese explosion-proof certification.
Switch Part No.
Explosion Proof (Note 1)
Operating Temperature
Operating Humidity
Degree of Protection
Dielectric Strength

Intrinsic Safety Ratings and Parameters

EB9Z-A
EB9Z-A1
Exia II CT6
Exia II BT6–20 to +60°C (no freezing)
45 to 85% RH (no condensation)
IP20
500V AC, 1 mA
1-channel Separate Wiring
16-channel Common Wiring
Maximum input voltage (Ui): 13.2V
Maximum input voltage (Ui): 13.2V
Maximum input current (Ii): 14.2 mA
Maximum input current (Ii): 227.2 mA
Maximum input power (Pi): 46.9 mW
Maximum input power (Pi): 750 mW
Internal inductance (Li):≤ 5 µHInternal inductance (Li):≤ 80 µH
Internal capacitance (Ci):≤ 2 nF
Internal capacitance (Ci):≤ 32 nF
Metallic: Magnesium content must be 7.5% or less (steel and aluminum are acceptable)

CautionTo prevent electrostatic
charges, do not rub theswitch surface during
operation. Use a soft cloth
dipped with water for
cleaning.
Caution Label Example

Plastic: Switch operator exposed area
IIC: 20 cm2 maximum
IIB: 100 cm2 maximum
When the switch has a wider exposed area, attach a caution label asshown at right.

Enclosure Material

Contact rating:Ui, Ii minimum
Contact:
With contact, no voltage
Contact resistance:
0.5Ω maximum
Cross sectional area of wire: 0.000962 mm2 minimum
Printed circuit board:
Thickness 0.5mm minimum
Copper foil width 0.15mm minimum
Thickness 18µm minimum one/both side(s)A resistor to prevent contact welding and an LED can be connected to 1-channel separate wiring circuits.
Consult IDEC for details.

Switch Ratings (Note 2)

Note 1: See “Operating Instructions” on page 7.
Note 2: For details, see “3. Switches in the Hazardous Area” on page 7.

Internal Circuit Block Diagram
AC Power, Relay Output

DC Power, Transistor Output

Connector Wiring, Sink Output
Hazardous Area••••••••P1 N1 P2 N2 P3 N3P1 N1 P2 N2 P3 N3
GreenYellow

Yellow

Yellow

Green

Yellow

Yellow

P1 • • • • P16 N1

Yellow

Green

~
~
~

~
L

N

+

A1 C1 A2 C2 A3 C3Yellow

N2

Safe Area(Non-hazardous Area)

Yellow~~~–

A1 C1 A2 C2 A3 C3+–

A1 • • • • A16 C1 C2

The power LED blinks in green at normal status. If the power LED blinks in red, replace the product.

Dimensions
Applicable Crimping Terminalø3.2 min.

6 max.

M3
ø675

3 max.

5.4 min.

65

171.5

4-ø4.4 hole

Connector Model
EB3C-T16C-CN

Stripping the Wire End
Solid Wire

83.7
(4)

6 to 8 mm

Stranded Wire (Ferrule)

65

77.5

4-M4
or
4-4.5 holes

6

6 to 8 mm

10

10
97

97

All dimensions in mm.

Mounting Hole Layout

3EB3C Relay Barriers

EB3C-∗03N
EB3C-∗02N

EB3C-∗06N
EB3C-∗05N
EB3C-∗08CN

65

110.5

77.5

65

171.5

61
75

42

EB3C-∗10N
EB3C-∗08N
EB3C-∗16CNø4.4

Screw Terminal
EB3C-∗01N

4

6

77.5

(4)

M3
ø6 hole

10

10

10

10

10

2-M4 tapped or
2-ø4.5 mounting holes

4-M4 tapped or
4-ø4.5 mounting holes

97

97

65

2-M4 tapped or
2-ø4.5 mounting holes

2-M4 tapped or
2-ø4.5 mounting holes

28

51

65

Mounting Hole Layout (Screw Mounting)External Wiring Examples
Transistor Output(Ex.: EB3C-T06AN)

P5

P6

P7

P8

N1

N2

A1

A2

A3

A4

A5

A6

A7

A8

C1

C2

P1

P2

P3

P4

P5

P6

P7

P8

N1

N2

24V DC

+

–

A1

A2

A3

A4

A5

A6

A7

A8

C1

C2

Load Power
24V DC

P1

P2

P3

P4

P5

P6

P7

P8

N1

N2

P9 P10 P 11 P12 P13 P14 P15 P16 N3

N4

A1

A2

A3

A4

A5

A6

A7

A8

C1

C2

A9 A10 A 11 A12 A13 A14 A15 A16 C3C4

24V DC

Note: On the sink/source transistor output model, ter­minals
A can be used as a positive common line.

Relay Output Common Wiring(Ex.: EB3C-R16CDN)

Relay Output(Ex.: EB3C-R06AN)–

24V DC

4

Load

Load

Load

Load

Load

100 to240V AC

Load

+

Load

Load
Power
AC/DC

Load

C6

Load

A6

Load

C5

Load

A5

N6

Load

C4

P6

Load

A4

N5

Load

C3

P5

Load

A3

N4

Load

C2

P4

Load

A2

N3

Load

C1

P3

Load

A1

N2

Load

N

P2

Load

L

N1

Load

P1

Load
Power
AC/DC

Load

Load
Power
24V DC

–

Load

Load

Load

Load

Load

Load

Load

P4

C6
+

100 to240V AC

P3

Load

A6

P2

Load

C5

P1

Load

A5

N6

Load

C4

P6

Load

A4

N5

Load

C3

P5

Load

A3

N4

Transistor Source Output(Ex.: EB3C-T08CSDN)

Load

C2

P4

Load

A2

N3

Load

C1

P3

Load

A1

N2

Load

N

P2

Load

L

N1

Load

P1

Transistor Sink Output(Ex.: EB3C-T08CKDN)Load Power
24V DCEB3C Relay Barriers

Connector Model Output Wiring Diagram
EB3C-T16CKD-CN (Sink)

Wiring Example with IDEC’s MicroSmart FC6A PLC Input Modules

CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16

A10 A11 A12 A13 A14 A15 A16

NC

NC

CHn

19

1

20

2

A1

A2

A3

A4

A5

A6

A7

A8

C1

C2

CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH8

+V

COM

EB3C

PLC
+V (C1)

Internal Circuit

24V DC(common +with load
power )

–
COM

+
An

COM
Internal Circuit

A9

A1-A16Input
I0-I15
COM (C2)

EB3C-T16CSD-CN (Source)
CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16A9

A10 A11 A12 A13 A14 A15 A16

NC

NC

19

1

20

2

A1

A2

A3

A4

A5

A6

A7

A8

C1

C2

CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH8

–V

COM

EB3C

CHn
–
An

+
COM

PLC

EB3C-T16CSD-CN

FC6A-N16B3

Input

Terminal

Terminal

OutputInput

Terminal

20

A1

I0

20

20

A1

I0

20

19

A9

I10

19

19

A9

I10

19

18

A2

I1

18

18

A2

I1

18

17

A10

I11

17

17

A10

I11

17

16

A3

I2

16

16

A3

I2

16

15

A11

I12

15

15

A11

I12

15

14

A4

I3

14

14

A4

I3

14

13

A12

I13

13

13

A12

I13

13

12

A5

I4

12

12

A5

I4

12

11

A13

I14

11

11

A13

I14

11

10

A6

I5

10

10

A6

I5

10

9

A14

I15

9

9

A14

I15

9

8

A7

I6

8

8

A7

I6

8

7

A15

I16

7

7

A15

I16

7

6

A8

I7

6

6

A8

I7

6

5

A16

I17

5

5

A16

I17

5

4

+V

COM

4

4

–V

COM

4

3

NC

COM

3

3

NC

COM

3

2

COM

NC

2

2

COM

NC

2

1

NC

NC

1

1

NC

NC

1

Internal Circuit

Internal Circuit

Input
I0-I15

A1-A16

FC6A-N16B3

OutputNote: The wiring in dashed line does not affect the operation of the EB3C.
Applicable connector: FL20A2F0 (Oki Electric Cable) or XG4M-2030-T (Omron)A separate power supply does not need to be connected to the PLC input module
because the power to the PLC input module is supplied from the relay barrier.

COM (C2)

24V DC+(commonwith load
power )

EB3C-T16CKD-CN
TerminalCOM

Wiring Example of Intrinsically Safe External Inputs
1. Common Wiring (Maximum 16 circuits)

P1
N1
P2
N2
P3
N3
P4
N4
P5
N5
P6
N6
L
N
A1
C1
A2
C2
A3
C3
A4
C4
A5
C5
A6
C6

N

N

N

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2

P1
N1
P2
N2
P3
N3
L
N
A1
C1
A2
C2
A3
C3

N

L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2

P1
N1
N2
L
N
A1
C1
C2

N

L
N
A1
P1
C1
N1
A2
P2
C2
N2
A3
P3
C3
N3
A4
P4
C4
N4
A5
P5
C5
N5
A6
P6
C6
N6
A7
P7
C7
N7
A8
P8
C8
N8
A9
P9
C9
N9
A10 P10C10 N10

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2
P9
P10
P11
P12
P13
P14
P15
P16
N3
N4

L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2
A9
A10
A11
A12
A13
A14
A15
A16
C3
C4

All input lines are wired to a common line inside the intrinsically safe switch (one common line per intrinsically safe circuit).

N

N

N

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2
L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2

P1
N1
P2
N2
P3
N3
P4
N4
P5
N5
P6
N6
L
N
A1
C1
A2
C2
A3
C3
A4
C4
A5
C5
A6
C6

N

N

L
N
A1
P1
C1
N1
A2
P2
C2
N2
A3
P3
C3
N3
A4
P4
C4
N4
A5
P5
C5
N5
A6
P6
C6
N6
A7
P7
C7
N7
A8
P8
C8
N8
A9
P9
C9
N9
A10 P10C10 N10

P1
N1
P2
N2
P3
N3

P1
N1
N2
L
N
A1
C1
C2

N

L
N
A1
C1
A2
C2
A3
C3

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2
P9
P10
P11
P12
P13
P14
P15
P16
N3
N4
L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2
A9
A10
A11
A12
A13
A14
A15
A16
C3
C4

Some input lines are wired to a common line inside the intrinsically safe switches, while others are outside switches(one common line per intrinsically safe circuit).

N

P1
N1
P2
N2
P3
N3
P4
N4
P5
N5
P6
N6
L
N
A1
C1
A2
C2
A3
C3
A4
C4
A5
C5
A6
C6

N

N

N

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2

P1
N1
P2
N2
P3
N3
L
N
A1
C1
A2
C2
A3
C3

N

L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2

P1
N1
N2
L
N
A1
C1
C2

N

L
N
A1
P1
C1
N1
A2
P2
C2
N2
A3
P3
C3
N3
A4
P4
C4
N4
A5
P5
C5
N5
A6
P6
C6
N6
A7
P7
C7
N7
A8
P8
C8
N8
A9
P9
C9
N9
A10 P10C10 N10

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2
P9
P10
P11
P12
P13
P14
P15
P16
N3
N4
L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2
A9
A10
A11
A12
A13
A14
A15
A16
C3
C4

All input lines are wired to a common line outside the intrinsically safe switch (one common line per intrinsically safe circuit).

N

2. Separate Wiring
Each input line of the EB3C makes up one independent intrinsically safe circuit.

5

P1
N1
P2
N2
P3
N3
P4
N4
P5
N5
P6
N6
L
N
A1
C1
A2
C2
A3
C3
A4
C4
A5
C5
A6
C6

N

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2

P1
N1
P2
N2
P3
N3
L
N
A1
C1
A2
C2
A3
C3

N

N

L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2

P1
N1
N2
L
N
A1
C1
C2

N

L
N
A1
P1
C1
N1
A2
P2
C2
N2
A3
P3
C3
N3
A4
P4
C4
N4
A5
P5
C5
N5
A6
P6
C6
N6
A7
P7
C7
N7
A8
P8
C8
N8
A9
P9
C9
N9
A10 P10C10 N10

P1
P2
P3
P4
P5
P6
P7
P8
N1
N2
P9
P10
P11
P12
P13
P14
P15
P16
N3
N4

L
N
A1
A2
A3
A4
A5
A6
A7
A8
C1
C2
A9
A10
A11
A12
A13
A14
A15
A16
C3
C4

EB3C Relay BarriersNN

2. Separate Wiring

P1
N1
P2
N2
P3
N3

P1
N1
P2
N2
P3
N3
P4
N4
P5
N5
P6
N6

L
N
A1
C1
A2
C2
A3
C3

L
N
A1
C1
A2
C2
A3
C3
A4
C4
A5
C5
A6
C6

N

N

L
N
A1
P1
C1
N1
A2
P2
C2
N2
A3
P3
C3
N3
A4
P4
C4
N4
A5
P5
C5
N5
A6
P6
C6
N6
A7
P7
C7
N7
A8
P8
C8
N8
A9
P9
C9
N9
A10 P10C10 N10

P1
N1
N2
L
N
A1
C1
C2

Each input line of the EB3C makes up one independent intrinsically safe circuit.

N

Diagram Symbols

N

Notes

Serial-Parallel Connection of Switches• As shown in the diagram on the left, a required number of “contacts in one
switch” (3 contacts in the example at left) can be added to the “contacts in
one switch” connected to one input channel.
• Similarly, a required number of “contacts in one switch” can be added to acommon line connected to multiple input channels.
• The capacitance and inductance of the added “contacts in one switch” must
be included in the calculation of the wiring capacitance and inductance in“Operating Instructions, 5. Wiring for Intrinsic Safety, (7)” on page 8.
• In addition, a required number of contacts can be added in the enclosureof “contacts in one switch.” In this case, however, do not include thecapacitance and inductance in the calculation of the wiring capacitanceand inductance on page 8. Instead, make sure that the internal capacitance(Ci) and internal inductance (Li) are within the values shown in the table“Switch Explosion-Protection Specifications (Japan only)” on page 3.

Contacts in one switch(EB9Z-A or EB9Z-A1)

L
N
A1
C1
C2

P1
N1
N2

One intrinsically safe circuit(maximum 16 circuits)

Recommended Connector Cable for Connector Models
Description

No. of Poles

Length (m)12

BX9Z-H200E4

3

BX9Z-H300E4

1

BX9Z-H100L

2

BX9Z-H200L

3

BX9Z-H300L

1

With Shield

2

I/O
Terminal
Cable

3
0.5
1

Without Shield2
3

20
Cable with Crimping Terminal

Part No.

FC9Z-H050A20
FC9Z-H100A20
FC9Z-H200A20
FC9Z-H300A20
FC9Z-H050B20
FC9Z-H100B20
FC9Z-H200B20
FC9Z-H300B20
BX9Z-H100E4

0.5

Shape

Applicable Model
IDEC MicroSmart
I/O Module

IDEC MicroSmart
I/O Module

200

Screw Terminal2
140-pin Cable for PLC

FC9Z-HA, FC9Z-HB
Internal Connection
FL20A2F0
IDEC
Connector(Oki Electric
Cable)

JE1S-201

19

20

17

18

15

16

13

14

11

12

9

10

7

8

5
3
1

6
4
2

(Connecting Side)

FL20A2F0IDEC(Oki Connector
Electric Cable)

JE1S-201

19
17
15
13

20
18
16
14

FL20A2F0(Oki Electric Cable)

IDEC Connector
JE1S-201
1

2

3

4

5

6

7

8

9

10

12

9

10

7

8

15 16

5

6

17 18

3

4

1

2

11 12
13 14

19 20

0
Connector A

Fujitsu Connector
FCN-367J040-AU/F
B A

Y-shaped Compression
Terminal
Y-shaped
Compresion(Marking
Tube No.) Terminal(Marking Tube No.)
1
3
5
7
9
11
13
15
17
19

2
4
6
8
10
12

FL20A2F0(Oki Electric Cable)
2

1

4

3

6

5

18

8

7

20

10 9

14
16

14 13
16 15
18 17
20 19

(Connecting Side)

6

Mitsubishi A Series
Input Module(positive common)↓
EB3C-T16CKD-CN

BX9Z-HL Internal Connection

12 11(Connecting Side)

Connector B

10

BX9Z E4
Internal Connection

11(Connecting Side)

350

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

FL20A2F0(Oki Electric Cable)

10 10
11 11

2

1

12 12

4

3

13 13

6

5

14 14

8

7

15 15

10 9

16 16

12 11

17 17

14 13

18 18

16 15

19 19

18 17

20 20

(Connecting Side)

20 19(Connecting Side)Operating Instructions
1. Installation of EB3C Relay Barriers

3. Switches in the Hazardous Area

(1) The EB3C can be installed in any direction.

(1) Switches (EB9Z-A, EB9Z-A1) contain the switch contact, enclosure, andinternal wiring. A switch contact refers to an ordinary switching device
which consists of contacts only (such as IDEC’s ABN pushbuttons). (SeeTable 1)
Switches other than non-voltage / switches with contacts (e.g., noncontact switches) cannot be used.
(2) When the switch (EB9Z-A, EB9Z-A1) has internal wiring or lead wire,
make sure that the values of internal capacitance (Ci) and inductance(Li) are within the certified values.

(2) Install the EB3C relay barrier in a safe area (non-hazardous area) in
accordance with intrinsic safety ratings and param­eters. To avoid
mechanical shocks, install the EB3C in an enclosure which suppresses
shocks.
(3) When installing or wiring the EB3C, prevent electromagnetic andelectrostatic inductions in the intrinsically safe circuit. Also prevent the
intrinsically safe circuits from contacting with another intrinsically safe
circuit and any other circuits.
Maintain at least 50 mm clearance, or provide a metallic separatingboard between the intrinsically safe circuit and non-intrinsically safety
circuit. When providing a metallic separating board, make sure thatthe board fits closely to the enclosure (top, bottom, and both sides).
Allowable clear­ance between the enclosure and board is 1.5 mm at the
maximum.
The clearance of 50 mm between the intrinsically safe cir­cuit andnon-intrinsically safe circuit may not be sufficient when a motor circuitor high-voltage circuit is installed nearby. In this case, provide a wider
clearance between the circuits referring to 5 (3) “Minimum Parallel
Distance between the Intrinsically Safe Circuit and Other Circuits.”(4) In order to prevent contact between intrinsically safe circuits and nonintrinsically safe circuits, mount EB3C units with terminals arranged in
the same direction.
Intrinsically Safe Circuit

EB3C

EB3C

EB3C

EB3C

Non-intrinsically
Safe Circuit

EB3C

Intrinsically Safe Circuit(5) Maintain at least 6 mm (or 3 mm according to IEC60079-11: 1999)
clearance between the terminal of intrinsically safe circuit and thegrounded metal part of a metal enclosure, and between the relay
terminal block of an intrinsically safe circuit and the grounded metal
part of a metal enclosure.

(3) Enclose the bare live part of the switch contact in an enclosure of IP20
or higher protection.
(4) Depending on the explosion-protection specifications according to TIIS,
the exposed area of plastic switch opera­tor is limited as follows:• Exia II CT6 (EB9Z-A):
20 cm2 maximum• Exia II BT6 (EB9Z-A1):
100 cm2 maximum(5) Attach the certification mark supplied with the EB3C on the switch (forJapan application).
(6) When the switch operator of plastic enclosure has a wider exposedarea than 20 cm2 maximum limits at II C or 100 cm2 maximum at II B,
attach a caution label as shown below.
Prevent electrostatic charge
Do not rub the surface during operation
Use a soft cloth dipped with water for cleaning(7) For the 1-circuit separate wiring, a resistor to prevent reed switch
contact welding and an LED miniature pilot lights can be connected inseries with the contact.
(a) Applicable resistor rating• Resistance: 100Ω maximum• Rated wattage: 1/2W to 3W• Type: Metal (oxide) film resistors• Model No. (example): KOA Corporation MOS, MOSX series*Use a M3 terminal screw or larger
R
Reed Switch(6) For installing the EB3C, mount on a 35-mm-wide DIN rail or directly
on a panel using screws. Make sure to install securely to withstandvibration. When mounting on a DIN rail, push in the clamp completely.
Use the BNL6 end clips on both sides of the EB3C to prevent frommoving sideways.
(7) Excessive extraneous noise may cause malfunction and damage tothe product. If the voltage limiting circuit (thyristor) inside the barrier
activates due to noise, all LEDs turn off, and the output will turn off.
When the voltage limit circuit activates, be sure to remove the noise
source because it does not automatically reset after shutting off thepower of the barrier. When the noise is removed, the barrier will return
to normal operation before powering up again.
(8) The power LED blinks in green at normal status. If the power LED
blinks in red, replace the product.

Terminal Block.

(b) Applicable LED
IDEC’s IPL1 series LED miniature pilot lights.

Table 1.Example of switches (EB9Z-A, EB9Z-A1) (contact part)
Control
Switches

2. Terminal Wiring(1) Using a ø5.5 mm or smaller screw driver, tighten the termi­nal screws(including unused terminal screws) to a torque of 0.6 to 1.0 N·m(recommended value).
(2) Make sure that IP20 is achieved when wiring. Use insulation tubes onbare crimping terminals.
(3) To prevent disengaged wires from contacting with other intrinsicallysafe circuits, bind together the wires of one intrinsically safe circuit.
(4) When the adjacent terminal is connected to another intrinsi­cally safe
circuit, provide an insulation distance of at least 6 mm.

EB3C

Sensing
Switches

Push-pull Switches

Pushbutton, Foot, Trigger, Rocker, Grip

Twisting Switches

Rotary, Selector, Cam, Drum, Thumb wheel

Lever and Slide Switches

Toggle, Multidirectional, Wobble stick, Lever,Slide switch

Displacement Switches

Microswitch, Limit, Magnetic proximity, Door,
Reed, Mercury

Level Switches

Liquid level

OthersPressure, Temperature

Note: For installation in hazardous areas and connection to the EB3C, use switches which
are certified, approved, or considered to be simple apparatus in relevant standards ineach country.

(8) Switches (EB9Z-A, EB9Z-A1) connected to the EB3C relay barrier
must have an insulation performance of 500V minimum forhazardous location grounding for both the switch contacts andwiring.

7

Operating Instructions
4. Output Specifications(1) When wiring the output from the EB3C, connect the non-intrinsicallysafe circuit to terminals A and C. The EB3C out­put circuit is not
equipped with short-circuit protection. If required, provide a protectionin the external circuit.
(2) Relay Output
Some types of loads generate reverse emf (such as sole­noids) or causea large inrush current (incandescent lamps), resulting in a shorter
operation life of output relay contacts. The operation life of contacts
can be extended by preventing the reverse emf using a diode, RC, orvaristor, or by suppressing the inrush current using a resistor or RL.

Minimum Parallel Distance between the Intrinsically Safe Circuit andOther Circuits (mm)Voltage and Current of Other
Circuits
Over 440V
440V or less
220V or less
110V or less
60V or lessOver 100A
2000
2000
2000
2000
2000

100A or less 50A or less
2000
600
600
600
500

10A or less

2000
600
600
500
300

2000
600
500
300
150

(4) When identifying intrinsically safe circuits by color, use light blue
terminal blocks and cables.

Contacts are made of gold-clad silver. When using at a small current
and a low voltage (reference value: 0.1 mA, 0.1V), test the contact on
the actual circuit in advance.

(5) When using two or more EB3C’s to set up one intrinsically safe circuitin the common wiring configuration, interconnect two neutral terminals(N1 through N10) on each EB3C between adjacent EB3C’s in parallel.

(3) Transistor Output
When connecting a small load, the load may not turn off because of aleakage current, even though the transistor output is turned off. If thisis the case, connect a resistor in parallel with the load to bypass theleakage current.
When an excessively high voltage or a reverse voltage is applied tothe output terminals, the clamping circuit or output transistor may bedamaged.

(6) Make sure that the power of the EB3C and contact are turned off before
starting inspection or replacement.
(7) When wiring the intrinsically safe circuit, determine the dis­tance tosatisfy the wiring parameters shown below. Note that parameters aredifferent between separate wiring and common wiring.

When driving an inductive load, be sure to connect a diode across theload to absorb reverse emf.
An

Load
∗

Cn
∗: Surge Absorber

Example of Overvoltage Absorption Circuit(4) In the common wiring only models, the output terminals are not isolated
from each other.
(5) When connecting the connector model EB3C’s in parallel, use one
power supply to power the EB3C’s. Do not connect any wiring to the C1
and C2 terminals.

5. Wiring for Intrinsic Safety(1) The voltage applied on the general circuit connected to the nonintrinsically safe circuit terminals of the EB3C relay bar­rier must be
250V AC, 50/60Hz, or 250V DC at the maxi­mum under any conditions,
including the voltage of the input power and the internal circuit.

a) Wiring inductance (Lc): Lc ≤ Lo – (Li + N × 5 µH)
Lo: Maximum external inductance of the EB3C
Li: Internal inductance of the switch
N:	The number of switches connected in series or parallel (thenumber is infinite)b) Wiring capacitance Cc: Cc ≤ Co – (Ci + N × 2 nF)
Co: Maximum external capacitance of the EB3C
Ci: Internal capacitance of the switch
N:	The number of switches connected in series or parallel (thenumber is infinite)c) Wiring resistance ≤ Rc
Rw: Allowable wiring resistanced) Allowable wiring distance T (km) is the smallest value of those
calculated from the capacitance, inductance, and resistance.
T ≤ Lc/L
T ≤ Cc/C
T ≤ Rc/2R
Note:

L (mH/km):
C (nF/km):
R (Ω/km):For the details of wiring the intrinsically safe circuits, refer to a rel­evant test
guideline for explosion-proof electric equipment in each country.

(8) Applicable Wire Size
0.5 to 2.1mm2 (AWG20 to AWG14)(2) When wiring, take into consideration the prevention of elec­tromagnetic
and electrostatic charges on intrinsically safe circuits. Also, prevent
intrinsically safe circuits from contact­ing with other circuits.
(3) The intrinsically safe circuits must be separated from non-intrinsicallysafe circuits. Contain intrinsically safe circuits in a metallic tube or duct,or separate the intrinsically safe cir­cuits referring to the table below.
Note:

Cables with a magnetic shield, such as a metallic sheath, prevent
electromagnetic induction and electrostatic induction, however, a nonmagnetic shield prevents electrostatic induction only. For non-magnetic
shields, take a preventive measure against electro­magnetic induction.

Finely twisted pair cables prevent electromagnetic induc­tion. Adding
shields to the twisted pair cables provides pro­tection against electrostaticinduction.

Be sure to read the instruction manual carefully before performing installation, wiring, or maintenance work.
For details on mounting, wiring, and maintenance, see the instruction manual from the below URL.
URL: https://product.idec.com/?product=EB3C-N

BGLEN01A EB3C June 2023

8

Inductance of cable per km
Capacitance of cable per km
Resistance of cable per km

Ordering Terms and Conditions
Thank you for using IDEC Products.
By purchasing products listed in our catalogs, datasheets, and the like (hereinafter referred to as “Catalogs”) you agree to be bound by these terms and conditions. Please readand agree to the terms and conditions before placing your order.

1. Notes on contents of Catalogs

3. Inspections(1) Rated values, performance values, and specification values of IDEC products
listed in this Catalog are values acquired under respective conditions in
independent testing, and do not guarantee values gained in combined
conditions.
Also, durability varies depending on the usage environment and usage
conditions.
(2) Reference data and reference values listed in Catalogs are for reference
purposes only, and do not guarantee that the product will always operate
appropriately in that range.
(3) The specifications / appearance and accessories of IDEC products listed in
Catalogs are subject to change or termination of sales without notice, for
improvement or other reasons.
(4) The content of Catalogs is subject to change without notice.

2. Note on applications(1) If using IDEC products in combination with other products, confirm theapplicable laws / regulations and standards.
Also, confirm that IDEC products are compatible with your systems, machines,
devices, and the like by using under the actual conditions. IDEC shall bear no
liability whatsoever regarding the compatibility with IDEC products.
(2) The usage examples and application examples listed in Catalogs are forreference purposes only. Therefore, when introducing a product, confirm theperformance and safety of the instruments, devices, and the like before use.
Furthermore, regarding these examples, IDEC does not grant license to use
IDEC products to you, and IDEC offers no warranties regarding the ownershipof intellectual property rights or non-infringement upon the intellectual
property rights of third parties.
(3) When using IDEC products, be cautious when implementing the following.
i. Use of IDEC products with sufficient allowance for rating and 		
performanceii.	Safety design, including redundant design and malfunction prevention
design that prevents other danger and damage even in the event that an
IDEC product failsiii.	Wiring and installation that ensures the IDEC product used in yoursystem, machine, device, or the like can perform and function according
to its specifications(4) Continuing to use an IDEC product even after the performance has
deteriorated can result in abnormal heat, smoke, fires, and the like due toinsulation deterioration or the like. Perform periodic maintenance for IDEC
products and the systems, machines, devices, and the like in which they areused.
(5) IDEC products are developed and manufactured as general-purpose products
for general industrial products. They are not intended for use in the following
applications, and in the event that you use an IDEC product for theseapplications, unless otherwise agreed upon between you and IDEC, IDEC shallprovide no guarantees whatsoever regarding IDEC products.
i.	Use in applications that require a high degree of safety, including nuclear
power control equipment, transportation equipment (railroads / airplanes/ ships / vehicles / vehicle instruments, etc.), equipment for use in outerspace, elevating equipment, medical instruments, safety devices, or
any other equipment, instruments, or the like that could endanger life or
human healthii.	Use in applications that require a high degree of reliability, such asprovision systems for gas / waterworks / electricity, etc., systems that
operate continuously for 24 hours, and settlement systems
iii.	Use in applications where the product may be handled or used deviatingfrom the specifications or conditions / environment listed in the Catalogs,
such as equipment used outdoors or applications in environments
subject to chemical pollution or electromagnetic interference
If you would like to use IDEC products in the above applications, be sure
to consult with an IDEC sales representative.

Head Office
USA
EMEA

We ask that you implement inspections for IDEC products you purchase without
delay, as well as thoroughly keep in mind management/maintenance regarding
handling of the product before and during the inspection.

4. Warranty(1) Warranty period
The warranty period for IDEC products shall be one (1) year after purchase ordelivery to the specified location. However, this shall not apply in cases where
there is a different specification in the Catalogs or there is another agreementin place between you and IDEC.
(2) Warranty scope
Should a failure occur in an IDEC product during the above warranty period
for reasons attributable to IDEC, then IDEC shall replace or repair that
product, free of charge, at the purchase location / delivery location of the
product, or an IDEC service base. However, failures caused by the following
reasons shall be deemed outside the scope of this warranty.
i. The product was handled or used deviating from the conditions / 		environment listed in the Catalogs
ii. The failure was caused by reasons other than an IDEC productiii. Modification or repair was performed by a party other than IDEC
iv. The failure was caused by a software program of a party other than 		IDEC
v. The product was used outside of its original purposevi.	Replacement of maintenance parts, installation of accessories, or the like
was not performed properly in accordance with the user’s manual and
Catalogs
vii. The failure could not have been predicted with the scientific and 		technical standards at the time when the product was shipped from 		
IDEC
viii.	The failure was due to other causes not attributable to IDEC (including
cases of force majeure such as natural disasters and other disasters)
Furthermore, the warranty described here refers to a warranty on the IDEC
product as a unit, and damages induced by the failure of an IDEC product are
excluded from this warranty.

5. Limitation of liability
The warranty listed in this Agreement is the full and complete warranty for IDEC
products, and IDEC shall bear no liability whatsoever regarding special damages,
indirect damages, incidental damages, or passive damages that occurred due to an
IDEC product.

6. Service scope
The prices of IDEC products do not include the cost of services, such as dispatching
technicians. Therefore, separate fees are required in the following cases.
(1) Instructions for installation / adjustment and accompaniment at test operation(including creating application software and testing operation, etc.)(2) Maintenance inspections, adjustments, and repairs(3) Technical instructions and technical training(4) Product tests or inspections specified by you
The above content assumes transactions and usage within your region. Please
consult with an IDEC sales representative regarding transactions and usage outsideof your region. Also, IDEC provides no guarantees whatsoever regarding IDEC
products sold outside your region.

www.idec.com

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APEM SAS

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Specifications and other descriptions in this brochure are subject to change without notice.
2023 IDEC Corporation, All Rights Reserved.

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TaiwanIDEC (Shanghai) Corporation
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