8952110000 Weidmuller, 8952110000 Datasheet - Page 90

• Manufacturer Part Number: 8952110000
• Description: SSR, DIN RAIL MOUNT, 275VAC, 32VDC, 20A
• Manufacturer: Weidmuller

Specifications of 8952110000

• Control Voltage Type: DC
• Control Voltage Range: 3VDC To 32VDC
• Operating Voltage Range: 12VAC To 275VAC
• Peak Surge Current: 250A
• Load Current: 20A
• Switching Mode: Zero Cross
• Rohs Compliant: No

C
Optos – overview
Control circuit
C.90
The input circuits (control circuit)
Most industrial application cannot be connected directly to an
opto, generally requiring voltage regulation by means of series-
connected resistances or capacitors.
To obtain exact-as-possible switching points a Schmitt Trigger
can be used to assign the control signals an unambiguous
status (0 - 1) when moving from high to low or low to high,
which is then passed on to the opto.
Depending on the design, all Weidmüller opto modules and
solid-state relays are equipped with suitable protective devices
(varistors, diodes) and filters to protect against interference
pulses from the control circuit.
DC input:
An additional reverse-polarity protection diode guarantees pro-
tection against the opto being destroyed if the control voltage is
incorrectly wired. The switching status of the control circuit is
signalised by a status indicator.
AC/DC input:
A rectifier with smoothing capacitor is connected in series for
AC control voltages. Reverse polarity protection for DC current
is not necessary. The following construction corresponds to a
DC circuit.
Due to the smoothing capacitor the switching frequency of
AC control signals is fundamentally less than half the mains
frequency. A higher switching frequency would result in the
control signal being constantly switched through in rhythm with
the mains frequency.
The advantage of being able to choose between an AC or a DC
current input contrasts with the disadvantage that the smoo-
thing capacitor also restricts the switching frequency of the DC
control signal.
AC input:
The circuit diagram corresponds in principle with an AC/DC
circuit. Instead of series resistors it is possible to use capacitors
to regulate the voltage in a purely AC operation. In contrast to
resistors there is no power loss with capacitors and as a result
no heat that needs to be dissipated.
Input configuration
DC input
AC/DC input
AC input
Control circuit
Control circuit
Control circuit
Control circuit