Brochure/Catalogue

for EMR for SSR
Pull-in current, typ (input) Typical current at which monostable electromechanical relays and solid-state
relays reliably switch on.
This means that this is the minimum input current value that must not be fallen
below for switch-on in order to switch on the relays.
They can also switch on at currents that are lower than the specied value, since
the specied value is a typical value at which they should be switched on.
For AC, specications are valid for 50 Hz unless otherwise indicated.
Measured at room temperature (approx. 23 °C), coil temperature equal to room
temperature and cold coil (without pre-excitation).
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
Pull-in voltage, typ (input) Typical voltage at which monostable electromechanical relays and solid-state
relays switch on.This means that this is the minimum input voltage value that
must not be fallen below for switch-on in order to switch on the relays.
They can also switch on at voltages that are lower than the specied value, since
the specied value is a typical value at which they should be switched on.
For AC, specications are valid for 50 Hz unless otherwise indicated.
Measured at room temperature (approx. 23 °C), coil temperature equal to room
temperature and cold coil (without pre-excitation).
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
R
Rated control voltage Rated voltage at which the relay is to be operated and at which other input and
output characteristics are measured.
For AC, specications are valid for 50 Hz unless otherwise indicated.
Control with other operating modes, such as pulse width modulation (PWM)
or half-wave rectication, can lead to changes in the input and output
characteristics, which are measured with the rated control voltage.
x x
Rated current DC or AC
(input)
Rated current that the relay draws when controlled with rated control voltage.
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).
Control with other operating modes, such as pulse width modulation (PWM)
or half-wave rectication, can lead to changes in the input and output
characteristics, which are measured with the rated control voltage.
x x
Rated switching voltage The value of the nominal mains voltage with the standard tolerances found in the
mains, which the contact can switch on the basis of the insulation data.
x x
Rated voltage (Isolation) Voltage level at which the insulation specications are measured – this is the
basis for sizing the clearance and creepage distance.
x x
EMR = Electromechanical relay
SSR = Solid-state relay
W
Technical appendix/Glossary
W.332737920000
Glossary: Relay modules and Solid-state relays