8952130000 Weidmuller, 8952130000 Datasheet - Page 94

• Manufacturer Part Number: 8952130000
• Description: SSR, DIN RAIL, 520VAC, 30VDC/30VAC, 20A
• Manufacturer: Weidmuller

Specifications of 8952130000

• Control Voltage Type: DC
• Control Voltage Range: 8VDC To 30VDC / 10VAC To 30VAC
• Operating Voltage Range: 24VAC To 520VAC
• Peak Surge Current: 250A
• Load Current: 20A
• Switching Mode: Zero Cross
• Rohs Compliant: No

C
Optos – overview
Protective measures
C.94
The construction of the opto enables fast and sensitive switch-
ing, however, the component is also more prone to interference.
For this reason, all Weidmüller opto modules and solid-state re-
lays are equipped with a variety of measures to protect against
overloading and interference pulses.
Free-wheeling diodes (DC)
Free-wheeling diodes are used primarily to protect against over-
voltages, which occur through self-induction when switching off
inductive DC loads (electric motors, relay coils).
Voltage spikes are limited to the equivalent value of the diode
forward voltage and excess voltage is discharged via the diode.
However, this leads to a delay in the voltage drop and as such
also delays the switching operation.
Zener diode / suppressor diode (DC)
These function as normal diodes in the forward conducting
direction. In the blocking direction they become low resistant at
a certain voltage (breakdown voltage).
High levels of overvoltages can lead to the destruction of the
zener diode / suppressor diode.
Varistor (AC/DC)
The functional principle of the varistor is also based on a break-
down voltage, but with faster reaction times. This allows higher
levels of energy to be shunted, however, these lead to the
component aging. This in turn reduces the breakdown voltage
over time and increases the leakage current.
RC-element (AC)
The RC element compensates voltage spikes by means of a
capacitor. Due to the charging and discharging characteristics
interference pulses are filtered out when the voltage is rising and
not first when overload is reached.
For this reason, RC elements are used to protect against inter-
ference pulses and exclude faulty switching operations.
Protective measures
Free-wheeling
diode
Suppressor diode
Zener diode
Varistor
RC element