TYPE GD-B・C・D

Earth Leakage Relay

Zero-phase sequencecurrent transformer

Seiko

株式会社正興C＆E

Control &Electronics

SEIKO C＆E

本社及び工場（JQA-2062）の一部 ISO9001認証取得

本社及び工場（EC99J1124）の一部 ISO14001認証取得

C

ER T I F I ED

MA

NA

G E M E N T S YST

EM

QUALITY SYSTEM

051

Seiko GD-B

High-speed operation, exposed type

Features

Low cost

Compact Small design means it fits easily into control centers, control boards and even machinery.

Switchable voltage and current sensitivity

　Circuit voltage can be changed easily by just changing the terminal connections. 　Current sensitivity can be changed quickly by changing the connecting bar (excluding 30-mA unit).

Two output contact systems

　

Robust enough to withstand surge currents without misoperation

Indicator lamps let you check operation at a glance

With terminal cover

1

In addition to standard output connection it can also be used for applications like alarms and remote display.

Earth Leakage Relay

Reference Standard IEC60755-1983

2

Dimensional drawings

Voltage terminal connection

Internal connection diagram

Current sensitivity select connection

SpecificationsModel GD-B03T

AC125V AC250V

Resistive load (COSØ＝1)

5A 5A

Inductive load (COSØ＝0.4)

3A 2A

50% min of rated current sensitivity

100, 110/200, 220

50, 60

2 max.

0.1 max.

1a+1c

GD-B12T GD-B25T GD-B510T

30 100/200 200/500 500/1000

VoltageLoad

Rated current sensitivity (mA)

Rated current threshold (mA)

Rated control voltage (AC-V)

Rated frequency (Hz)

Power consumption (W)

Operating time (sec)

Output contacts

Output contact ratings

Operating temperature (ºC)

Operating humidity (%)

Usage voltage range (%)

Operation indicator

Leakage detection

Recovery

Weight (kg)

Applicable ZCT

-20 to +60 (average ambient 50ºC max.)

Relative 45 to 85 (no condensation)

80 to 110

Red LED

Electronic current operation

Manual 0.25

Test switch

Operation indicator

38

Reset switch

Case (polycarbonate, black)2-4.6mm dia. Holes

M3.5 terminal screw (copper-zinc plate)

80 94

41

51

Terminal cover (polycarbonate, clear)

8474

P3

P2

P1１００

V２００

V

Select bar

Connect bar between k and n for 200, 500 and 1000 mA

ZCT

kn

Caution: Factory setting is between k and n. Adjust as needed.

Test switchLeakage relay

Operation indicator

Reset switch

Outputcontacts

Controlsupply

AC 100 or200 V

ZCT

Current sensitivity select bar

k

n

P3

P2P1

a2

C2

C1

b1

a1

GDZ-16 to 80, GDZM-16 to 107. ※For GD-B03T use GDZ-16 to 40 and GDZM 16 to 42.

(for M4)

No bar on 30 mA model

Connect between l and n for 100, 200 and 500 mA

Multi-function, exposed type Features

Rational wiring layout

3

Leakage relay set type: GD－C－ D

　　　Insert a “C” here to indicate terminal covers.

DIN rail

Operation speed select switch

Operation indicator

Test switch

Reset switch

Sensitivity current select switch

N.P

Seiko GD-C Earth Leakage Relay

Connecting wires can be run in either of two directions to fit available space, providing expanded freedom in layout.

In addition to standard output connection it can also be used for applications like alarms and remote display.

Can be mounted on DIN rails

Two output contact systems

Change operating characteristics quickly to match changes in specifications or installation.

Selectable control voltage, current sensitivity and operating time

Terminal covers are available as optional parts.

Single cover: GDTC-C

Cover set: GD-C-C

DIN rail mounting fittings are available as optional parts.

DIN rail fittings: GDAP-C

Can be fitted with terminal covers

Robust enough to withstand surge currents without misoperation

Indicator lamps let you check operation at a glance


4


Internal connection diagram

SpecificationsGD-C

30/100/200/500/1000 (selectable)


100, 110/200, 220

50, 60

2 max.

0.1 max. (high-speed)/0.3 (delay): (selectable)

1a+1c



80 to 110

Red LED


Manual 0.25

※See page 12 for explanation of model types.

3825

75 85

2-4.5mm dia. Holes

(for M4)

Terminal (tin plate)

M3.5 terminal screw (copper-zinc plate)

9996

8

1

Case (polycarbonate, black)

Terminal cover (polycarbonate, clear)(option)

Sensitivity current select

Operation time select

Adjust as required. (0.3 sec)

10030 200

500

1000（mA）

Use a flat-blade screwdriver to adjust as required. (30mA)

0.1S 0.3Smax.

Control supply (50-60 Hz)

Operation indicator

Reset switch

Output contact

Operation speed select switch

Sensitivity current select switch

Test switch

Output contact

GDZM-16 to 107 ※For 30-mA current sensitivity,

use GDZM-16 to 42.

Model







Output contacts





Operation indicator

Leakage detection

Recovery

Weight (kg)

Applicable ZCT

AC125V

AC250V


5A

5A


3A

2A

VoltageLoad

Specifications

5

Current sensitivity

Selectable to 100, 200, 500 or 1000 mA with a rotary switch.

Operating time

Selectable to 0.3, 0.5, 1 or 2 s with a rotary switch.

Power indicator

Green LED provided to show when power is supplied from board.

Terminal cover

Clear terminal cover mounted. Holes for tightening terminal screws are designed to protect fingers.

Seiko GD-D (embedded type) Earth Leakage Relay

Front Rear

６

Features

Wide range of supply voltages

Can be used at AC 120 and 240 V as well, making it perfect for use outside Japan.

Manual or automatic recovery (switchable)

Switchable selection of push button manual recovery or automatic recovery after leakage current is resolved.

DIN size

Board footprint is DIN size, 48 x 96 mm, for easy board standardization.

Quick-release terminals

Terminal screws cannot fall out, reducing connection time and labor requirements.

One-touch mounting

Quick mounting by just snapping into place on the board. No screws are needed, only a square hole, reducing construction time and labor requirements.Time and labor are further reduced because no screw tightening is needed.


7


SpecificationsGD-D

100/200/500/1000 (selectable)


100, 120/200, 240

50, 60

2 max. 0.3/0.5/1/2 (selectable)

1a+1c



80 to 110

Red LED

Green LED


Manual or automatic (switchable) 0.25

GDZM-16 to 107

Operating information

Power indicator (green)

Leakage indicator (red)

Test switch

48

96

Sensitivity currentselect switch

Operating time select switch

Manual/automatic recovery select switch

Reset switch

Ratings

Front case(polycarbonate, black)

One-touch panel mechanism(applicable panel thickness 1 to 3.2 mm) Rear case

(polycarbonate, black)

12 65

91

Movable protective cover (polycarbonate, clear)

44

Rear cover (polycarbonate, clear)

Terminal labels

Mounting hole dimensions

Ø 7

M3.5 screw (quick-release type)(copper-zinc plating)

45 +0.8 0

92+0.8

0

Model

AC125V AC250V


5A 5A


3A 2A

VoltageLoad







Output contacts





Operation indicator

Power indicator

Leakage detection

Recovery

Weight (kg)

Applicable ZCT

“A” view

8

Installation locations for ground short protector

Representation connection diagrams

Quick reference chart for ground short protector installation locations Installation required × Not required –Not applicable

Note: For details refer to the official documentation.

Law

1. Sites exposed to water

2. Sites exposed to high humidity

3. Dry sites

Voltage to ground Operating voltageInstalled equipment and environment

150 V max.

60 V max.

×

×

×

×

×

×

×

×

×

×

×

×

－

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

－

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

－

－

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

－

－

×

×

×

×

×

－

－

－

－

－

－

×

－

100V 200V（１ø3W） 200V 415V

Over 150 V

4. Equipment installed in generating plants, substations, breaker stations or similar sites

5. For equipment covered under and fitted with ELB, and power feed reinforced

6. Where ground resistance is 3Ω max.

7. For equipment covered under with double-insulated construction

8. Non-grounded circuit using isolation transformer

9. Equipment covered with insulating material such as rubber, synthetic resin, etc.

10 Equipment connected to secondary side of inductive motor

11 Electric welding machines, electric furnaces, electric boilers, electrolysis tanks, etc.

12 Low-voltage lines connected to super-high or high voltage lines through transformers (excluding at generating plants and substations) (Article 40)

13 2 kW or larger equipment in residential sites, connected to circuits with over 150 V to ground (Article 162)

14 Equipment in gunpowder storage facilities (Article 195)

15 Thermocouple systems such as floor heating (Article 228)

16 Electrically-heated floors (Article 230)

17 Underwater lighting for pools, etc (Article 234)

18 Cabtyre cables in aboveground installation (Article 147)

19 Sites where ground construction is difficult (Articles 19, 29)

20 Temporary wiring embedded in concrete (Article 242)

21 Sites damp with water or other highly conductive liquids

22 Installations over conductive surfaces such as steel plate, steel beams, workbenches, etc.

23 Sites other than 21 and 22 above

24 Ungrounded circuits using isolation transformers

25 Uses on isolation benches

26 For equipment covered under with double-insulated construction

27 Where workers may contact insulated wires or moving wires (Article 336)

(30 V max.X)

(50 V max.X)

(50 V max.X)

1. When used in conjunction with line breaker 3. When used as leakage alarm

2. When used as solenoid breaker 4. Zero-phase sequence current transformer thru-conductors

Single-phase 2-line

1 2

Single-phase 3-lineTriple-phase 3-line

1 32

Triple-phase 4-line

1 3N2

(Load)

(Power supply)

(Power supply)

(Power supply)

(Load) (Load)

Remote power supply can alsobe provided for alarm display

An earth leakage breaker or earth leakage relay can be used with a breaker (line breaker, sole-noid breaker, etc.) as a ground short protector. With an earth leakage relay board area can be used effectively.

Where possibility of contact by human be-ings exists

Electrical facility tech

nical stan

dard

s (Article 15)

Electrical facility tech

nical stan

dard

s (interp

retation

s)

Eq

uip

men

t with

metal extern

al cases (A

rticle 40)

Labo

r health

and

safety reg

ulatio

ns

Movable and transportable

motorized equipm

ent (Articles 333, 334)

Note: For automatic reset, connect control sup-ply to MCCB load side (will not dis-play leakage).

Off

On

Seiko GDZM

【Models with terminals】

GDZM－16BT

GDZM－30AT

GDZM－42AT

GDZM－65AT

GDZM－80AT

GDZM－107AT

【Models with leads】

GDZM－16B

GDZM－30A

GDZM－42A

GDZM－65A

GDZM－80A

9

Can be used together with GD-B, GD-C or GD-D relays.

Zero-phase sequence current transformer

10


Models with terminals

60

5018

42When terminal cover used

2 5-mm dia. Holes (for M4)

Ø16

GDZM-16BT

22

46

60

50

42

2 5-mm dia. Holes (for M4)

Ø16

GDZM-16B

22

4649.5

M3.5 screw 18

0.5 mm2 lead, length 700, black


F 40 50

G6 Mounting hole (for M5) Mounting hole (for M5)

B

M3.5 screwWhen terminal cover used

A

C

D

B

A

C

DE

Model

GDZM-30ATGDZM-42ATGDZM-65AT

304265

66.579.5106

3440.553.5

71.586.5108

7388

110

232324

406565

A B C D E F Model

GDZM-30AGDZM-42AGDZM-65A

304265

66.579.5106

3440.553.5

71.586.5108

232324

406565

A B C D E FG

GDZM-30AT,42AT,65AT GDZM-30A,42A,65A

GDZM-80AT GDZM-80A

M3.5 screw

27 40 50

1006

Mounting hole (for M5)

27 40 50

1006

Mounting hole (for M5)

126

When terminal cover used

64.5

148

126

64.5

148

149.

5

EF

6

40 50

ø80


Models with leads

11


Model Hole dia. Ratedcurrent

600 V vinyl insulated wire (IV)

Nominal cross-sectional area of thru-conductor

600V flame-retardant Polyflex wire (600V MLFC)

GDZM-16BT, GDZM-16B

GDZM-30AT, GDZM-30A

GDZM-42AT, GDZM-42A

GDZM-65AT, GDZM-65A

GDZM-80AT, GDZM-80A

GDZM-107AT

Note: Wire dimensions as per Hitachi Cable standards.

Ø16

Ø30

Ø42

Ø65

Ø80

Ø107

14mm2

60mm2

125mm2

400mm2

500mm2

500mm2

2 wires

50A

150A

250A

500A

800A

1600A

3 wires 4 wires 6 wires 2 wires 3 wires 4 wires 6 wires

8mm2

50mm2

125mm2

325mm2

500mm2

500mm2

8mm2

38mm2

100mm2

250mm2

400mm2

500mm2

14mm2

60mm2

100mm2

250mm2

325mm2

325mm2

8mm2

38mm2

80mm2

250mm2

325mm2

325mm2

8mm2

30mm2

60mm2

150mm2

250mm2

325mm2 325mm2500mm2

GDZM-107AT

Ø 10719

4 209

210

Terminal cover (option)

Insulating tube (hard PVC)

Terminal strip

Case SPCC(caution electrocoat)

4636.430

130

175

62 76.5

M6 mounting hole

M3.5 screw (copper-nickel plate)

Models with terminals

12

GD-B earth leakage relays

List of Seiko Electric earth leakage relays and zero-phase sequence current transformers

GD-C earth leakage relays

GD-C options

GD-D earth leakage relay

GDZM zero-phase sequence current transformer

GD-B03TGD-B12TGD-B25TGD-B510T

GD-CAGD-CS1GD-CAS1GD-CS2K1GD-CAS2K1GD-CK2GD-CV1GD-CE

GD-C

AC 100, 110/200, 220 V, sensitivity current 30 mA AC 100, 110/200, 220 V, sensitivity current 100/200 mA AC 100, 110/200, 220 V, sensitivity current 200/500 mA AC 100, 110/200, 220 V, sensitivity current 500/1000 mA

AC 100, 110/200, 220 V, operating time 0.1 max/0.3 s, Sensitivity Current 30/100/200/500/1000 mA, manual resetAutomatic reset ※ Operating time 0.2/0.5 s ※ Automatic reset, operating time 0.2/0.5 s ※ Sensitivity current 30/100/300/500/1000mA Operating time 0.1/0.2 s ※ Automatic reset, Sensitivity current 30/100/300/500/1000mA operating time 0.1/0.2 s ※ Sensitivity current 30/40/50/100/1000 mA ※ AC 120/240 V ※ Electrical external reset (resettable via external contact) ※

GDTC-CGDAP-C

Terminal cover (single unit) DIN rail mount fittings (single unit)

Model Specification

Model

Model

Specification

Specification

GD-D

GD-DK2

AC 100, 120/200, 240 V, operating time 0.3/0.5/1/2 s, sensitivity current 100/200/500/1000 mAAC 100, 120/200, 240 V, operating time 0.3/0.5/1/2 s, sensitivity current 50/100/200/500 mA

Model Specification

GDZM-16BTGDZM-30ATGDZM-42ATGDZM-65ATGDZM-80ATGDZM-107ATGDZM-16BGDZM-30AGDZM-42AGDZM-65AGDZM-80A

With terminals, thru-hole diameter 16 mm, rated current 50 A With terminals, thru-hole diameter 30 mm, rated current 150 A With terminals, thru-hole diameter 42 mm, rated current 250 A With terminals, thru-hole diameter 65 mm, rated current 500 A With terminals, thru-hole diameter 80 mm, rated current 800 A With terminals, thru-hole diameter 107 mm, rated current 1600 A With leads, thru-hole diameter 16 mm, rated current 50 A With leads, thru-hole diameter 30 mm, rated current 150 A With leads, thru-hole diameter 42 mm, rated current 250 A With leads, thru-hole diameter 65 mm, rated current 500 A With leads, thru-hole diameter 80 mm, rated current 800 A

Model Specification

※ Only specifications different from GD-C shown.When optional terminal cover installed, a “C” suffix is added.When DIN rail fittings used, a "D" suffix is added.

When optional terminal cover installed, a “C” suffix is added.

13

Handling precautions Do not disassemble earth leakage relays or zero-phase sequence current trans-

formers. Never test to confirm electrical shock safety with your hand or other part of

your body. It is impossible to prevent electrical shocks between wires. When measuring circuit insulation resistance or dielectric strength it is impossi-

ble to measure between wires, so always disconnect the leakage relay first. There are no problems, however, between chargers and ground.

Do not test dielectric strength between control supply terminals or between ter-minals for input from the ZCT. This could damage the leakage detect circuit.

Where there are excessive branches or where line length is excessive, a high-sensitivity relay on the main circuit could result in false triggers by weighted leakage. Select an appropriate current sensitivity.

Precautions in use Always prepare mounting holes to specified dimensions and mount securely. Connection terminal torque is 0.7 to 1.0 N m. Excess torque will damage termi-

nals. Do not mount in sites subject to excessive heat. Do not mount in sites subject to excessive vibration or impact. Do not mount in sits subject to corrosive or flammable gas, ash, steam or salt,

or subject to water or oil spray. Do not run dedicated ground lines through zero-phase sequence current trans-

formers Always run the common wire for single-phase 3-line and triple-phase 4-line sys-

tems through the ZCT. The straight portion of the thru-conductor should be as long as possible to en-

sure ZCT balancing. Thru-conductors should be bundled with cable ties to prevent damage from

electromagnetic repulsion in the event of shorts. Connection between earth leakage relay and ZCT should be with twisted wire to

avoid induction effects. Earth leakage relays and ZCT should be at least 10 cm distant from trunks carry-

ing several thousand A or more, to avoid external magnetic field effects. Load equipment should be grounded in accordance with local law and regula-

tion.

Maintenance inspection items Always check operation with the test button prior to use. Press the test button

long enough to operate. Check operation with the test button periodically, about once a month. If the leakage relay activates, inspect the circuit and rectify the problem, then

turn power back on.

TYPE GD-B・C・D

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