Rittal enclosure heater assembly instructions
5
5 Electrical connection
EN
4
Mounting
The heater is fitted vertically, i.e. with the con-
nection terminal or fan facing downwards. To
permit the required convection, a minimum
clearance to the adjacent components must
be observed. A safety clearance of at least
300 mm must be left at the air outlet in the
case of heaters with fans, and 100 mm for
heaters without fans. (For both heaters a ther-
mal safety clearance to the sides of 60 mm
and 100 mm at the bottom is required). If
these clearances are observed, the ambient
temperature at the air inlet does not rise
above 65°C.
There are two different methods of
assembling the heater:
1. Snap-type fastening onto a 35 mm support
rail DIN EN 50 022 (fig. 2).
2. Screw fastening onto the mounting plate
(fig. 3).
It should be ensured that the heater and
connection cables are mounted firmly and
securely.
Electric cables must not touch the body of
the heater fan and must not be routed directly
past the hot air outlet.
The heater must not be mounted in the
vicinity of flammable materials.
5
Electrical connection
The heater must be connected, via the quick-
connect terminals, to a power supply of the
voltage stated on the rating plate.
The heater must be connected to the
mains via an all-pole isolating device in
accordance with the overvoltage category III
to EN 60 664-1. Only copper wires are to be
used for the electrical connection. Due to
the special characteristics of the PTC heater
element, a current of up to 4.4 A may be
reached for a short time when the heater is
switched on.
Slow-blowing fuse-links (gG) or circuit-
breakers with a corresponding delayed-trip
characteristic can be used as pre-fuses. The
required pre-fuse rating is specified on the
rating pate. Overvoltage protection is to be
provided where pulse loads exceeding
1,000 V are possible. The double connection
terminal permits the cascading of several
heaters and thus simplifies wiring. In such
cases, it may be necessary to adapt the pre-
fuse rating to accommodate the total start-up
current. The maximum switching capacity of
the devices must nevertheless be observed.
Note:
In justified, exceptional cases,
heaters with fan (235 – 870 W)
may be installed rotated through
180°.
Please note that, in case of
mounting on a 35 mm support
rail, the mounting clips must also
be rotated through 180°.
