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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
terminal section space in the following figure for the crimp terminal
dimensions.
Relay Contacts (Unit: mm)
12.5
6
6
Relay Coil
Auxiliary Contact Block
6.8
5.5
5.5
• 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
Location
Crimp
terminals
Contact
5.5-5
section
8-5
Coil
1.25-3.5
section
• 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.
10
Power Relays
14.5
11
M5
6.8
4.3
M3.5
9.5
M3.5
Appropriate wire size
2
2.63 to 6.64 mm
(AWG12, 10)
2
6.64 to 10.52 mm
(AWG8)
2
0.5 to 1.65 mm
(AWG20 to 16)
G7Z
Operating Coil
(Internal Connections of Coils)
DC Coil
A2
• If a transistor drives the G7Z, check the leakage current and
connect a bleeder resistor if necessary.
• The must operate voltage is the minimum value for the Relay
armature to operate and the contacts to turn ON. Therefore,
fundamentally 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
Impulse withstand voltage: 2.5 kV min. or
contact separation (a + b): 0.5 mm min.
a
NC
NO
Contact welding
A1
Auxiliary contact block
b
Relay
NC
NO
NO
NO
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