10
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
terminal 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
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
Location Crimp
terminals
Appropriate wire size
Contact
section
5.5-5
2.63 to 6.64 mm
2
(AWG12, 10)
8-5
6.64 to 10.52 mm
2
(AWG8)
Coil
section
1.25-3.5
0.5 to 1.65 mm
2
(AWG20 to 16)
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
a
b
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.
Summary of Contents for G7Z
Page 10: ...Power Relays G7Z 11...
