Technical information

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ds_x61_en_ssr_technical_information: 011212D
Terminology of SSR
Term Description
Input side
Control voltage Input voltage necessary for normal SSR operation under the specified temperature conditions.
Activation voltage
Threshold at which the output turns on as the control voltage is gradually increased with the
specified voltage applied to the loaded output.
Recovery voltage
Threshold at which the output turns off as the control voltage is gradually decreased with the
specified voltage applied to the loaded output.
Input impedance Resistance of the current limiting resistor used in the SSR input side.
Input line voltage Input voltage at which an input module SSR operates normally.
Input current Input current at which an input module SSR operates normally.
Load side
Max. load current
Maximum continuous current allowable across the SSR output terminals under the specified
heat dissipation and ambient temperature conditions. AC current is specified in RMS units.
Load voltage
Output supply voltage range in which the SSR operates normally. AC voltage is specified in
RMS units.
Logic supply voltage/current Supply voltage/current range in which an input module SSR operates normally.
Non-repetitive surge current
Maximum non-repetitive load current allowable under the specified heat dissipation and
ambient temperature conditions. In general, it is given by the peak value of a single cycle of
sinusoidal commercial AC current.
“OFF-state” leakage current
Current that flows in the SSR output circuit when the specified supply voltage is applied to the
output with no control voltage applied to the input.
“ON-state” voltage drop
Output voltage drop caused by a specified load current supplied to the SSR output which is
turned on by a specified input control voltage. AC voltage is specified in RMS units.
Min. load current
Minimum load current at and above which the SSR operates normally under the specified
temperature conditions. AC load current is specified in RMS units.
Output stage breakdown voltage Maximum voltage that can be applied across the output and ground of an input module SSR.
Max. load current Maximum current allowable for the output circuit of an input module SSR.
Repetitive peak voltage, max.
Maximum repetitive voltage which can be continuously applied across the SSR output
terminals. In general, a voltage of more than 400 V AC is used for 100 V AC applications, and
more than 600 V AC for 200-250 V AC applications, to absorb supply voltage variations or on/
off surges.
Critical turn-off voltage rise ratio
SSRs may turn on if a turn-off voltage with a steep rising edge is applied. This phenomenon is
called “dv/dt turn on.” Critical turn-off voltage rise ratio refers to the maximum turn-off voltage
rise ratio at and below which the SSR remains turned off.
Electrical
Characteristics
Operate time, max. Time until the SSR output turns on after the specified control voltage is applied to the input.
Release time, max.
Time until the SSR output turns off after the specified control voltage is removed from the
input.
Insulation resistance
Resistance measured with a specified voltage applied across the input and output, or across
the input or output and frame ground.
Breakdown voltage
Maximum voltage below which no dielectric breakdown occurs when applied for 1 minute
across the same test points as those used for insulation resistance testing.
Vibration resistance
Functional: The device sustains no damage and meets the specifications if it is exposed to
vibration with its magnitude not exceeding this threshold during transit or installation.
Destructive: Closed contacts of a relay remain closed for the specified time period if it is
exposed to vibration with its magnitude not exceeding this threshold during operation.
Shock resistance
Functional: The device sustains no damage and meets the specifications if it is exposed to
physical impact with its magnitude not exceeding this threshold during transit or installation.
Destructive: Closed contacts of a relay remain closed for the specified time period if it is
exposed to physical impact with its magnitude not exceeding this threshold during operation.
Ambient temperature
Ambient temperature range over which the SSR operates normally under the specified heat
dissipation and load current conditions.
Storage temperature
Ambient temperature range over which an SSR can be safely stored for extended periods
without sustaining damage or performance degradation.