336

Power Relays

G7Z

Connecting

• Use round or open-end (Y-type) crimp terminals and connect the

terminals with the appropriate tightening torque. Refer to the termi-

nal section space in the following figure for the crimp terminal

dimensions.

Relay Contacts (Unit: mm)

Relay Coil

Auxiliary Contact Block

• One crimp terminal can be used for the Relay contact section (M5

screw). Two crimp terminals can be connected for the coil terminal

and auxiliary contact block.

Recommended Crimp Terminals and Wire

• Use the following tightening torque when tightening screws. Loose

screws may result in fire caused by abnormal heat generated when

the power is being supplied.

M5 screws: 2.0 to 2.2 N•m

M3.5 screws: 0.8 to 0.9 N•m

• Allow suitable slack on leads when wiring, and do not subject the

terminals to excessive force.

Microloads

The G7Z is used for switching power loads, such as current carry for

device power supplies and heater loads. Use an auxiliary contact

block (G73Z) if microloads are required for signal applications and

operation status feedback.

Operating Coil

(Internal Connections of Coils)

DC Coil

• If a transistor drives the G7Z, check the leakage current and con-

nect a bleeder resistor if necessary.

• The must operate voltage is the minimum value for the Relay arma-

ture to operate and the contacts to turn ON. Therefore, fundamen-

tally apply the rated voltage to the coils, taking into consideration

the increases in coil resistance caused by voltage fluctuation and

coil temperature rise.

Mirror Contact Mechanism

By combining a Relay with an auxiliary contact block, all NC contacts

of the auxiliary contact block will satisfy an impulse withstand voltage

of more than 2.5 kV or maintain a gap of more than 0.5 mm when the

coil is de-energized even if at least one NO contact (main contact) of

the Relay is welded (according to EN 60947-4-1).

Description of Mirror Contact Mechanism

Location

Crimp

terminals

Appropriate wire size

Contact

section

5.5-5

8-5

Coil section 1.25-3.5

11

M5

14.5

12.5

6

6

6.8

4.3

M3.5

9.5

6.8

5.5

5.5

M3.5

A2

A1

ab

Contact welding

NO

NO

NO

NC

NC

NO

Auxiliary contact block

Relay

Impulse withstand voltage: 2.5 kV min. or

contact separation (a + b): 0.5 mm min.