Brochure/Catalogue

Special loads
Reliably switch or monitor inductive, capacitive and high loads
If special loads such as inductivities or high inrush currents are to be switched
or monitored safely and reliably, you need individually tailored relay modules
and solid-state relays. These customised solutions extend the service life of
the switching element and, what‘s more, they can be installed in the panel
in a space-saving manner thanks to optimised connection options.
Capacitive loads
Many loads with capacitive load components are now concealed in
upstream pre-circuits, e.g. in solenoid valves, contactors or power supplies
for LED lighting. These pre-circuits can contain capacitors that generate
high inrush current peaks of up to 150A. Such current peaks can lead to
welding of the output contacts or destroy the output. To avoid this, special
relay modules and solid-state relays from our portfolio are used.
Inductive loads
Switching inductive loads, e.g. solenoid valves, can cause electric arcs with
voltage peaks of up to several thousand volts. They are caused during the
switching process by the energy stored in the coil and can destroy the contact
through material evaporation and material migration. With high DC voltage and a
continuous light arc, the relay can even fail during the first switching cycle. In order
to suppress the formation of electric arcs, you need to use an external protective
suppressor circuit. We offer special products for switching inductive loads, which
have a special overload or protective suppressor circuit for the output, for example.
High DC voltages
Standard relay modules can only switch relatively low DC currents because
they lack the zero crossing to extinguish the light arc. Their maximum
DC current value also depends on the switching voltage as well as the
design conditions such as contact gap and contact opening speed. Our
power relays for switching high DC loads have a built-in blowout magnet
and a large contact gap to significantly minimise contact wear.
Wiring-optimised variants
The optimisation of wiring time and space requirements is becoming
increasingly important. Our versions with snap-on PE foot allow for fast wiring
of actuators where a PE contact is required. This means that no additional PE
terminal is required in the panel. Our 1NO contact variants allow the use of
a connection on the relay socket for wiring the negative or neutral conductor
potential. Therefore, the negative potential is bridged to the designated
connection with the aid of a power-feed terminal in order to wire the actuators
directly – without an additional terminal for the negative potential.
C.8 2737920000
Application range
C
Special loads – Overview