3
0814EN November 2016
T
hermo
-
elecTric
acTuaTors
T
hermo
-
elecTric
acTuaTors
N
ormally
o
peN
r478, r478m
Product code
Absorbed power
Voltage
Max. peak current
(*)
Current absorbed
after 12 mins. (*)
Resistance (*)
Power wire section
Microswitch
Varistor
R478X121
3,5 W
230 V 50 Hz
≤ 1,0 A
≤ 0,015 A
1200 Ω +46 % -35 %
2 x 0,75 mm
2
-
-
R478X122
3 W
24 V 50 Hz
≤ 0,22 A
≤ 0,125 A
147 Ω ± 25 %
2 x 0,75 mm
2
-
-
R478VX121
3,5 W
230 V 50 Hz
≤ 1,0 A
≤ 0,015 A
1200 Ω +46 % -35 %
2 x 0,75mm
2
-
S10K250
R478MX021
3,5 W
230 V 50 Hz
≤ 1,0 A
≤ 0,015 A
1200 Ω +46 % -35 %
4 x 0,75 mm
2
5 A 125 Vac
3 A 250 Vac
-
R478MX022
3 W
24 V 50 Hz
≤ 0,22 A
≤ 0,125 A
147 Ω ± 25 %
4 x 0,75 mm
2
5 A 125 Vac
3 A 250 Vac
-
R478VX021
3,5 W
230 V 50 Hz
≤ 1,0 A
≤ 0,015 A
1200 Ω +46 % -35 %
4 x 0,75mm
2
5 A 125 Vac
3 A 250 Vac
S10K250
(*) Values read at room temperature
Electrical connections
Avvertenza.
On the supply circuit, a fuse or a protection device external to the device, has to be installed to intervene in case of fault/short circuit conditions.
R478
thermo-electric actuators provide for various connection options able to satisfy a wide range of installation needs. The most frequent cases require simple
direct connections to ambient thermostats or interposition of relays to control the circulators or zone valves.
L1
N1
N1
N2
L2
R1
R478X121
R478VX121
R478X122
230 Vac
24 Vac
3W
3,5W
Termostati ambiente / Room thermostats
NC C NO
NC C NO
NC C NO
R478M
thermo-electric actuators equipped with a stroke-end microswitch enable to easily activate circulators or zone valves. They are generally connected to
ambient thermostats taking into consideration that the R478M is open when there is no voltage (while the microswitch is electrically closed in such status). To
control significant power loads, we recommend installing a relay to prevent overloading of the actuator microswitches.
L2
L1
N1
N3
L3
N2
R1
R1
Termostati ambiente / Room thermostats
R478MX021
R478VX021
230 Vac
MAX 5A 125Vac
MAX 3A 250Vac
MAX 3A 250Vac
3,5W
R478MX022
24 Vac
MAX 5A 125Vac
3W
NC C NO
NC C NO
NC C NO
Product specifications
R478
Thermo-electric actuator normally open for thermostatizable valves and manifolds. 2-conductors wire, length 1,5 m. Protection class IP40. Rapid connection. Position
mechanic indicator. Room temperature range -5÷50 °C. Available with 230 V, 24 V power. Complies with Directive B.T. and provided with ENEC 03 certification.
R478M
Thermo-electric actuator normally open for thermostatizable valves and manifolds. 4-conductors wire with stroke-end microswitch, length 1,5 m. Protection
class IP40. Rapid connection. Position mechanic indicator. Room temperature range -5÷50 °C. Available with 230 V, 24 V power with or without varistor.
Complies with Directive B.T. and provided with ENEC 03 certification.
