www.belimo.com T5-SRF24A-S2(-O) • en • v1.0 • 12.2011 • Subject to changes 1 / 3

Technical data sheet SRF24A-S2(-O)

Rotary actuator with emergency function for 2- and 3-way ball valves• Tor�ue 2�� �mTor�ue 2�� �m 2�� �m• �ominal voltage AC/DC 24 V• Control�� O�en-closeControl�� O�en-close• Two integrated au�iliary switchesTwo integrated au�iliary switches• SRF24A-S2�� Deenergised �CSRF24A-S2�� Deenergised �C

SRF24A-S2-O�� Deenergised �O

Technical data

Electrical data Nominal voltage AC 24 V, 50/60 Hz / DC 24 VNominal voltage range AC 19.2 ... 28.8 V / DC 21.6 ... 28.8 VPower consumption In operation

At restFor wire sizing

5 W @ nominal torque2.5 W7.5 VA

Auxiliary switch 2 x SPDT, 1 mA ... 3 (0.5) A, AC 250 V (1 x fix 10% / 1 x adjustable 11 ... 100%)

Connection MotorAuxiliary switch

Cable 1 m, 2 x 0.75 mm2

Cable 1 m, 6 x 0.75 mm2

Parallel connection Yes (Note performance data for supply!)

Functional data Torque MotorSpring return

Min. 20 Nm @ nominal voltageMin. 20 Nm

Direction of rotation Spring return– SRF24A-S2– SRF24A-S2-O

Deenergised NC, ball valve closed (A – AB = 0%)Deenergised NO, ball valve open (A – AB = 100%)

Manual override With hand crank and interlocking switchAngle of rotation Max. 90°Running time Motor

Spring return≤75 s / 90°≤20 s @ –20 ... 50°C / max. 60 s @ –30°C

Sound power level MotorSpring return

≤45 dB (A)≤62 dB (A)

Position indication Mechanical

Safety Protection class III Extra low voltage / UL Class 2 SupplyDegree of protection IP54

NEMA 2, UL Enclosure Type 2EMCLow-voltage directive

CE according to 2004/108/ECCE according to 2006/95/EC

Certification cULus according to UL 60730-1A and UL 60730-2-14and CAN/CSA E60730-1:02Certified to IEC/EN 60730-1 and IEC/EN 60730-2-14

Mode of operation Type 1.AA.BRated impulse voltage Actuator

Auxiliary switch0.8 kV2.5 kV

Control pollution degree 3Ambient temperature –30 ... +50°CNon-operating temperature –40 ... +80°CAmbient humidity 95% r.h., non-condensatingMaintenance Maintenance-free

Dimensions / Weight Dimensions See «Dimensions» on page 3Weight Approx. 2.2 kg (without ball valve)

SRF24A-S2(-O) Rotary actuator with emergency function for ball valves, AC/DC 24 V, 2�� �m, with two au�iliary switches

2 / 3 T5-SRF24A-S2(-O) • en • v1.0 • 12.2011 • Subject to changes www.belimo.com

Product features

Mode of o�eration The actuator moves the ball valve to the operating position at the same time as tensioning the return spring. The ball valve is turned back to the safety position by spring force if the supply voltage is interrupted.

Sim�le direct mounting Straightforward direct mounting on the ball valve with only one screw. The mounting position in relation to the ball valve can be selected in 90° steps.

Manual override Manual operation of the valve with the hand crank, locking in any position with the interlocking switch. Unlocking is manual or automatic by applying the operating voltage.

Adjustable angle of rotation Adjustable angle of rotation with mechanical end stop.

High o�erational reliability The actuator is overload-proof, requires no limit switches and automatically stops when the end stop is reached.

Fle�ible signalization The actuator has one auxiliary switch with a fixed setting and one adjustable auxiliary switch. They permit a 10% or 11 ... 100% angle of rotation to be signalled.

Combination valve actuators Refer to the valve documentation for suitable valves, their permitted media temperatures and closing pressures.

Electrical installation

Wiring diagram

1 2

– +

T ~

S1 S2 S3 S4 S5 S6

<A >A

<B >B

A = 10% B = 11 ... 90%

230 V ++

++

230 V24 V 24 V

230 V 24 V24 V 230 V

�Cable colours��1 = black2 = redS1 = violetS2 = redS3 = whiteS4 = orangeS5 = pinkS6 = grey

�otes• Connect via safety isolation transformer.• Parallel connection of other actuators possible.

Note the performance data.

!

Safety notes

!• The actuator has been designed for use in stationary heating, ventilation and air conditioning

systems and is not allowed to be used outside the s�ecified field of a��lication, es�ecially in aircraft or in any other airborne means of trans�ort.

• It may only be installed by suitably trained �ersonnel. Any legal regulations or regulations issued by authorities must be observed during installation.

• The device may only be o�ened at the manufacturer's site. It does not contain any �arts that can be re�laced or re�aired by the user.

• The cables must not be removed from the device.• The integrated switches of this actuator have to be connected either to Power su��ly voltage

or safety e�tra low voltage. The combination Power su��ly voltage / safety e�tra low voltage is not allowed.

• The device contains electrical and electronic com�onents and is not allowed to be dis�osed of as household refuse. All locally valid regulations and re�uirements must be observed.

SRF24A-S2(-O) Rotary actuator with emergency function for ball valves, AC/DC 24 V, 2�� �m, with two au�iliary switches

www.belimo.com T5-SRF24A-S2(-O) • en • v1.0 • 12.2011 • Subject to changes 3 / 3

Further documentations • Complete overview «The comlete range of water solutions»• Data sheets for ball valves• Installation instructions for actuators and/or ball valves• Notes for project planning (hydraulic characteristic curves and circuits, installation regulations,

commissioning, maintenance etc.)

Dimensions [mm]

Dimensional drawings

101

27

59

40162172182244

103

NRF..A../SRF..A..

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7107

3-00

001.

E

NC NO

33 ... 100%

Y= 0 Y= 0

.2.4

.6.8

.9

.8

.7

.6

.5

.4.3

.2.1

NO NC

4

3

1

.9

.8

.7

6

A

ABB

2

A – AB = 0%B – AB = 100%Z

M5

M4

3

4

.9

.8

.7

6

M42

A

ABB

A – AB = 100%B – AB = 0%Z

M5

1

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NRF..A../SRF..A..

AC230V

1 3 2 4

Y1 Y2

a b

N L

S1 S2 S3 S4 S5 S6

<A >A

<B >B

1 3 2 4

Y1 Y 2

a b

A = 10% B = 11 ... 100%

N L 230 V ++

++

230 V24 V 24 V

230 V 24 V24 V 230 V

�

NRF(D)230A-3(-O)SRF230A-3(-O)

NRF(D)230A-3-S2(-O)SRF230A-3-S2(-O)

b(Y2)

a(Y1)

A – AB = 100%

A – AB = 0%

stop stop

NO NC

AC24V/DC24V

1 2

– +

T ~

1 2

– +

T ~

S1 S2 S3 S4 S5 S6

<A >A

<B >B

A = 10% B = 11 ... 90%

230 V ++

++

230 V24 V 24 V

230 V 24 V24 V 230 V

�

NRF24A(-O)SRF24A(-O)

NRF24A-S2(-O)SRF24A-S2(-O)

AC230V

1 2

N L

1 2 S1 S2 S3 S4 S5 S6

<A >A

<B >B

A = 10% B = 11 ... 90%

N L 230 V ++

++

230 V24 V 24 V

230 V 24 V24 V 230 V

�

NRF230A(-O)SRF230A(-O)

NRF230A-S2(-O)SRF230A-S2(-O)

AC24...240V/DC24...125V

1 2

– +

N L T ~

S1 S2 S3 S4 S5 S6

<A >A

<B >B

1 2

– +

N L T ~

A = 10% B = 11 ... 90%

230 V ++

++

230 V24 V 24 V

230 V 24 V24 V 230 V

�

NRFA(-O)SRFA(-O)

NRFA-S2(-O)SRFA-S2(-O)

!

!

!

NRF..A.. / SRF..A..

www.belimo.com M5-Z-NRF..A../SRF..A.. • v1.0 • 11.2011 1 / 1

7136

4-00

003.

A

AB

A

A – AB = 100% B – AB = 0%

A

AB B

A – AB = 100%

Z

A

ABBA

M5

AB

M5