Brochure/Catalogue

for EMR for SSR
Drop-out current, typ Typical current at which previously switched on monostable electromechanical
relays and solid-state relays switch off.
This means that this is the maximum input current value that must not be
exceeded for switch-off in order to switch off the relays.
They can also switch off at currents that are signicantly higher than the
specied value, since the specied value is a typical value at which they should
be switched off.
For AC, specications are valid for 50 Hz unless otherwise indicated.
Measured at room temperature (approx. 23 °C) and an only briey energised
input (coil temperature below thermal stability).
The switching thresholds of electromechanical relays are strongly dependent
on environmental parameters such as ambient temperature, mounting position,
manufacturing tolerances (e.g. coil resistance) and the shape of the control
signal. Therefore, the values in the application may differ from the data sheet
specications.The switching thresholds of solid-state relays uctuate less, since
the electronic components are less temperature-dependent than a relay coil.
x x
Drop-out voltage, typ Typical voltage at which previously switched on monostable electromechanical
relays and solid-state relays switch off.
This means that this is the maximum input voltage value that must not be
exceeded for switch-off in order to switch off the relays.
They can also switch off at voltages that are signicantly higher than the
specied value, since the specied value is a typical value at which they should
be switched off.
For AC, specications are valid for 50 Hz unless otherwise indicated.
Measured at room temperature (approx. 23 °C) and an only briey energised
input (coil temperature below thermal stability).
The switching thresholds of electromechanical relays are strongly dependent
on environmental parameters such as ambient temperature, mounting position,
manufacturing tolerances (e.g. coil resistance) and the shape of the control
signal. Therefore, the values in the application may differ from the data sheet
specications. The switching thresholds of solid-state relays uctuate less, since
the electronic components are less temperature-dependent than a relay coil.
x x
Duty cycle, relative duty cycle Describes the ratio of the switched-on state of a relay or solid-state relay to the
total duration in intermittent, continuous or short-time operation. The duty cycle
is expressed as a percentage of the total cycle duration.
The heating of the relay can be inuenced positively or negatively by the duty
cycle.
A high duty cycle leads to increased heating of the relay due to the power loss of
the coil and the switching contacts.
Unless otherwise specied, Weidmüller relay modules and solid-state relays are
suitable for 100% duty cycle (continuous operation).
With very fast switching solid-state relays, the duty cycle also affects the
maximum switching frequency. This is then indicated in the corresponding
diagrams in the data sheet.
x x
EMR = Electromechanical relay
SSR = Solid-state relay
Glossary: Relay modules and Solid-state relays
W
Technical appendix/Glossary
W.22 2737920000