Technical data sheet
SRF24A-SR
Modulating rotary actuator with
emergency control function for ball
valves
• Nominal torque 20 Nm
• Nominal voltage AC/DC 24 V
• Control Modulating DC (0)2...10 V
• Position feedback DC 2...10 V
• Deenergised closed (NC)
Technical data
Electrical data
Nominal voltage
AC/DC 24 V
Nominal voltage frequency
50/60 Hz
Nominal voltage range
AC 19.2...28.8 V / DC 21.6...28.8 V
Power consumption in operation
5.5 W
Power consumption in rest position
3 W
Power consumption for wire sizing
8.5 VA
Connection supply / control
Cable 1 m, 4 x 0.75 mm²
Parallel operation
Yes (note the performance data)
Functional data
Torque motor
Min. 20 Nm
Torque spring return
Min. 20 Nm
Positioning signal Y
DC 0...10 V
Positioning signal Y note
Input impedance 100 kΩ
Operating range Y
DC 2...10 V
Position feedback U
DC 2...10 V
Position feedback U note
Max. 0.5 mA
Position accuracy
±5%
Direction of rotation motor
Y=0 (0V = A-AB = 0%)
Direction of rotation spring-return
Deenergised NC, valve closed (A - AB = 0%)
Manual override
By means of hand crank and locking switch
Angle of rotation
90°
Running time motor
90 s / 90°
Running time emergency setting position <20 s / 90°
Sound power level motor max.
45 dB(A)
Position indication
Mechanical
Service life
Min. 60,000 emergency positions
Safety
Protection class IEC/EN
III Safety extra-low voltage
Protection class UL
UL Class 2 Supply
Degree of protection IEC/EN
IP54
Degree of protection NEMA/UL
NEMA 2, UL Enclosure Type 2
EMC
CE according to 2004/108/EC
Certification IEC/EN
IEC/EN 60730-1 and IEC/EN 60730-2-14
Certification UL
cULus according to UL 60730-1A, UL 60730-2-
14 and CAN/CSA E60730-1:02
Mode of operation
Type 1.AA
Rated impulse voltage supply / control
0.8 kV
Control pollution degree
3
Ambient temperature
-30...50°C
Non-operating temperature
-40...80°C
Ambient humidity
95% r.h., non-condensing
Maintenance
Maintenance-free
Weight
Weight approx.
2.2 kg
Safety notes
!
• This device has been designed for use in stationary heating, ventilation and air
conditioning systems and is not allowed to be used outside the specified field of
application, especially in aircraft or in any other airborne means of transport.
www.belimo.eu
SRF24A-SR • en-gb • 2014-10-15 • subject to changes
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