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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)
14.5
Operating Coil
(Internal Connections of Coils)
DC Coil
12.5
A2
A1
6
6
M5
11
? 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.
Relay Coil
4.3
6.8
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
Auxiliary Contact Block
9.5
6.8
M3.5
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
Impulse withstand voltage: 2.5 kV min. or
contact separation (a + b): 0.5 mm min.
5.5
a
b
Auxiliary contact block
5.5
M3.5
? One crimp terminal can be used for the Relay contact section (M5
NC
NC
Relay
screw). Two crimp terminals can be connected for the coil terminal
and auxiliary contact block.
Recommended Crimp Terminals and Wire
Location
Crimp
Appropriate wire size
NO
NO
NO
NO
terminals
Contact welding
Contact
section
5.5-5
8-5
2.63 to 6.64 mm 2 (AWG12, 10)
6.64 to 10.52 mm 2 (AWG8)
Coil section 1.25-3.5
0.5 to 1.65 mm 2 (AWG20 to 16)
? 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.
Power Relays
G7Z
359
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