input
type of the power supply network	1-phase and 2-phase AC
supply voltage at AC	Automatic selection; startup starting from Ue ≥ 90/180 V
supply voltage	120 V/230 V
input voltage 1 at AC	85 … 132 V
input voltage 2 at AC	170 … 264 V
wide range input	No
buffering time for rated value of the output current in the event of power failure minimum	25 ms
operating condition of the mains buffering	at Vin = 230 V
line frequency	50/60 Hz
line frequency	45 … 65 Hz
input current
● at rated input voltage 120 V	15 A
● at rated input voltage 230 V	9 A
current limitation of inrush current at 25 °C maximum	50 A
I2t value maximum	8 A²·s
fuse protection type	Yes
fuse protection type in the feeder	Recommended miniature circuit breaker at 1-phase operation: 16 A characteristic C; required at 2-phase operation: circuit breaker 2-pole connected or circuit breaker 3RV2421-4BA10 (120 V) or 3RV2411-1JA10 (230 V)
output
voltage curve at output	Controlled, isolated DC voltage
output voltage at DC rated value	24 V
output voltage
● at output 1 at DC rated value	24 V
output voltage adjustable	Yes; via potentiometer
adjustable output voltage	24 … 28 V; max. 960 W
relative overall tolerance of the voltage	3 %
relative control precision of the output voltage
● on slow fluctuation of input voltage	0.1 %
● on slow fluctuation of ohm loading	0.1 %
residual ripple
● maximum	100 mV
● typical	50 mV
voltage peak
● maximum	240 mV
● typical	220 mV
display version for normal operation	Green LED for 24 V OK; LED yellow for overload; LED red for short-circuit or latching shutdown
type of signal at output	Relay contact (NO contact, rating 60 V DC/ 0.3 A) for “24 V OK”
behavior of the output voltage when switching on	Overshoot of Vout approx. 3 %
response delay maximum	1.5 s
voltage increase time of the output voltage
● typical	30 ms
output current
● rated value	40 A
● rated range	0 … 40 A; +60 … +70 °C: Derating 3%/K
supplied active power typical	960 W
short-term overload current
● on short-circuiting during the start-up typical	120 A
● at short-circuit during operation typical	120 A
duration of overloading capability for excess current
● on short-circuiting during the start-up	25 ms
● at short-circuit during operation	25 ms
constant overload current
● on short-circuiting during the start-up typical	60 A
bridging of equipment	Yes; switchable characteristic
number of parallel-switched equipment resources for increasing the power	2
efficiency
efficiency in percent	92 %
power loss [W]
● at rated output voltage for rated value of the output current typical	82 W
● during no-load operation maximum	6.8 W
closed-loop control
relative control precision of the output voltage with rapid fluctuation of the input voltage by +/- 15% typical	1 %
relative control precision of the output voltage load step of resistive load 50/100/50 % typical	1.9 %
setting time
● load step 50 to 100% typical	2 ms
● load step 100 to 50% typical	2 ms
relative control precision of the output voltage at load step of resistive load 10/90/10 % typical	3.8 %
setting time
● load step 10 to 90% typical	1 ms
● load step 90 to 10% typical	1 ms
● maximum	1 ms
protection and monitoring
design of the overvoltage protection	< 32 V
property of the output short-circuit proof	Yes
design of short-circuit protection	Alternatively, constant current characteristic approx. 41 A or latching shutdown
● typical	41 A
overcurrent overload capability
● in normal operation	250% Iout rated up to 25 ms, 150% Iout rated up to 5 s/min
enduring short circuit current RMS value
● typical	41 A
display version for overload and short circuit	LED yellow for “overload”, LED red for “latching shutdown” or “short-circuit”
safety
galvanic isolation between input and output	Yes
galvanic isolation	Safety extra-low output voltage Uout acc. to EN 60950-1 and EN 50178
operating resource protection class	Class I
leakage current
● maximum	0.1 mA
● typical	0.1 mA
protection class IP	IP20
EMC
standard
● for emitted interference	EN 55022 Class B
● for mains harmonics limitation	–
● for interference immunity	EN 61000-6-2
standards, specifications, approvals
certificate of suitability
● CE marking	Yes
● UL approval	Yes; cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; cCSAus (CSA C22.2 No. 60950-1, UL 60950-1)
● CSA approval	Yes; cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; cCSAus (CSA C22.2 No. 60950-1, UL 60950-1)
● EAC approval	Yes
● Regulatory Compliance Mark (RCM)	Yes
● NEC Class 2	No
type of certification
● BIS	Yes; R-41183539
● CB-certificate	Yes
MTBF at 40 °C	838 156 h
standards, specifications, approvals hazardous environments
certificate of suitability
● IECEx	No
● ATEX	No
● ULhazloc approval	No
● cCSAus, Class 1, Division 2	No
● FM registration	No
standards, specifications, approvals marine classification
shipbuilding approval	Yes
Marine classification association
● American Bureau of Shipping Europe Ltd. (ABS)	Yes
● French marine classification society (BV)	No
● Det Norske Veritas (DNV)	Yes
● Lloyds Register of Shipping (LRS)	No
standards, specifications, approvals Environmental Product Declaration
Environmental Product Declaration	Yes
global warming potential [CO2 eq]
● total	2 616.1 kg
● during manufacturing	48.8 kg
● during operation	2 565.8 kg
● after end of life	0.7 kg
ambient conditions
ambient temperature
● during operation	-25 … +70; with natural convection
● during transport	-40 … +85
● during storage	-40 … +85
environmental category according to IEC 60721	Climate class 3K3, 5 … 95% no condensation
connection method
type of electrical connection	screw terminal
● at input	L, N, PE: 1 screw terminal each for 0.2 … 4 mm² single-core/finely stranded
● at output	+, -: 2 screw terminals each for 0.5 … 10 mm²
● for auxiliary contacts	13, 14 (alarm signal): 1 screw terminal each for 0.14 … 1.5 mm²
mechanical data
width × height × depth of the enclosure	145 × 145 × 150 mm
installation width × mounting height	150 mm × 225 mm
required spacing
● top	40 mm
● bottom	40 mm
● left	0 mm
● right	0 mm
fastening method	Snaps onto DIN rail EN 60715 35×15
● DIN-rail mounting	Yes
● S7 rail mounting	No
● wall mounting	No
housing can be lined up	Yes
net weight	3.1 kg
accessories
electrical accessories	Buffer module, redundancy module
mechanical accessories	Device identification label 20 mm × 7 mm, TI-grey 3RT2900-1SB20
further information internet links
internet link
● to website: Industry Mall	https://mall.industry.siemens.com
● to web page: selection aid TIA Selection Tool	https://www.siemens.com/tstcloud
● to web page: power supplies	https://siemens.com/sitop
● to website: CAx-Download-Manager	https://siemens.com/cax
● to website: Industry Online Support	https://support.industry.siemens.com
additional information
other information	Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)
security information
security information	Siemens provides products and solutions with industrial cybersecurity functions that support the secure operation of plants, systems, machines and networks. In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial cybersecurity concept. Siemens’ products and solutions constitute one element of such a concept. Customers are responsible for preventing unauthorized access to their plants, systems, machines and networks. Such systems, machines and components should only be connected to an enterprise network or the internet if and to the extent such a connection is necessary and only when appropriate security measures (e.g. firewalls and/or network segmentation) are in place. For additional information on industrial cybersecurity measures that may be implemented, please visit www.siemens.com/cybersecurity-industry. Siemens’ products and solutions undergo continuous development to make them more secure. Siemens strongly recommends that product updates are applied as soon as they are available and that the latest product versions are used. Use of product versions that are no longer supported, and failure to apply the latest updates may increase customer’s exposure to cyber threats. To stay informed about product updates, subscribe to the Siemens Industrial Cybersecurity RSS Feed under https://www.siemens.com/cert. (V4.7)