Specifications

36
Product name Surge suppression
element
Specification Operation
indicator lamp
Control circuit voltage Type
AC DC
Coil Surge Suppression Units Varistor Varistor voltage: 100V - 24-48V Not required.
*
SZ1KZ1
Varistor voltage: 240V 48-125V
SZ1KZ2
Varistor voltage: 470V 100-250V
SZ1KZ3
Varistor voltage: 100V LED (red) 24-48V Not required.
*
SZ1KZ4
Varistor voltage: 240V 48-125V
SZ1KZ5
Operation Indicator Units - - LED (red) 12-24V 12-24V
SZ1KL1
24-48V 24-48V
SZ1KL2
48-125V 48-125V
SZ1KL3
Note: * A varistor is built into the SK
□
G and SK
□
L for DC operation.
Product Application Characteristics (200V AC coil)
Without Surge
Suppression Unit
A sharp surge voltage is generated from the coil due
to coil inductance as a result of the rapid change in
voltage when the coil turns OFF. This becomes noise
to surrounding electronic devices, and can cause
malfunctions and circuit destruction.
SK12A
(0.1ms/div, 1kV/div)
Models with varistors
built in
When the surge voltage reaches a certain level, current
flows to the varistor that is connected in parallel with the
coil. This serves to control the peak surge voltage.
Varistors can be applied to either AC or DC.
The suppressed surge voltage is approximately the
varistor voltage.
SK12A + SZ1KZ3
(2ms/div, 200V/div)
23
6.5
Internal Connection Diagram
Mass : 3g
35
15
Internal Connection Diagram
Mass : 4g
46.5
26.5
LED (red)
23
6.5
Internal Connection Diagram
Mass : 2g
LED (red)
38
18
23
6.5
Mini-Contactors
SK Series
Coil Surge Suppression Units and Operation Indicator Lamps
Features
The Main Circuit Surge Absorber Unit absorbs the surge voltage that
is generated when the coil in a Magnetic Contactor turns OFF. This
suppresses malfunctioning of electronic circuits.
The Operation Indicator Unit indicates with an LED when voltage is
applied to the coil terminals.
Ratings and Types
Coil Surge Suppression Characteristics
Mounting methods Dimensions, mm
(1) Insert the Unit into the mounting holes in the Magnetic Contactor.
The Unit must be oriented properly top to bottom. Do not mount
the Unit backwards.
Mounting to Non-reversing
Magnetic Contactors
Mounting to Reversing
Magnetic Contactors
SZ1KZ1 to SZ1KZ3
(Coil Surge Suppression Units)
SZ1KZ4 and SZ1KZ5
(Coil Surge Suppression Units with Operation Indicator Lamps)
SZ1KL1 to SZ1KL3
(Operation Indicator Units)
+(DC)
−(DC)
+(DC)
−(DC)
Coil Surge Suppression Units and Operation
Indicator Lamps
SZ1KZ3 SZ1KZ4