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Siemens 6AG1961-3BA21-4AX0 — PLCs (Programmable Logic Controllers)

Siemens 6AG1961-3BA21-4AX0 SITOP PSU8200, 24 V 40 A

MPN6AG1961-3BA21-4AX0
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Siemens SITOP PSU8200, 6AG1961-3BA21-4AX0, 24 V DC 40 A power supply, DIN rail mount, 96.6% efficiency.

$269.24Ref. price · indicative, final on quote
Siemens 6AG1961-3BA21-4AX0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6AG1961-3BA21-4AX0 key specifications
ParameterValue
Type of signal at outputIsolated relay contact (changeover contacts, rating 8 A/240 V AC, 24 V DC): Signals OK if both input voltages > switching threshold, setting range of threshold 20 ... 25 V
Type of electrical connectionscrew-type terminals
Type of the power supply networkDC voltage
Voltage curve at outputControlled, isolated DC voltage
Formula for output voltageVin - approx. 0.5 V
Output voltage at DC rated value24 V
Product function output voltage adjustableNo
At rated output voltage for rated value of the output current typical34 W
Depth of the enclosure120 mm
Width of the enclosure70 mm
Height of the enclosure125 mm
Product feature of the enclosure housing can be lined upYes

All specifications

6AG1961-3BA21-4AX0 additional specifications
ParameterValue
In horizontal mounting position during operation0 ... 60 °C; with natural convection
Installation altitude at height above sea level maximum6 000 m
Ambient condition relating to ambient temperature - air pressure - installation altitudeIn case of operation at altitudes of 2000 - 6000 m above sea level: Output power derating of -7.5 %/1000 m or reduction of the ambient temperature by 5 K/1000 m
MTBF at 40 °C6 471 654 h
CE markingYes
Top50 mm
Left0 mm
Right0 mm
At DC24 ... 28.8 V
Bottom50 mm
At inputInput, output and ground: 1 screw terminal each for 0.33 ... 10 mm² single-core/finely stranded
Rated range40 A; max. aggregate current 40 A; +60 ... +70 °C: derating 3%/K
Rated value40 A
MountingSnaps onto DIN rail EN 60715 35x7.5/15
Other informationSpecifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)
Galvanic isolationyes, SELV acc. to EN 60950-1 (relay contact)
Protection class IPIP20
Efficiency in percent96.6 %
For auxiliary contactsRelay contact: 3 screw terminals for 0.5 ... 2.5 mm² single-core/finely stranded
For emitted interferenceEN 55022 Class B
For interference immunityEN 61000-6-2
During storage and transport-40 ... +85 °C
At output 1 at DC rated value24 V
During NO-Load operation maximum1.5 W
Operating resource protection classClass III
Display version for normal operationGreen LED for "both Input voltages > switching threshold"; red LED: for "at least one input voltage < switching threshold"
Chemical resistance to commercially available cooling lubricantsYes; incl. diesel and oil droplets in the air
Product conformity of the coating qualification and performance of electrical insulating compound for printed board assemblies according to IPC-CC-830AYes; Conformal Coating, Class A

Product details

Field-fit note – clearances and mounting

The enclosure is 70 mm wide, 125 mm high, 120 mm deep. For natural convection cooling, allow 50 mm clearance above and below the unit. You can butt it left and right against adjacent units (0 mm clearance needed on those sides). Screw terminals on the input side accept 0.33 to 10 mm² conductors; output and ground use the same. That covers standard panel wiring without adapter blocks.

Ratings you'll lean on in the field

At 25 °C ambient it delivers the full 40 A at 24 V DC (typical output power 34 W). Above 60 °C, derate 3% per Kelvin up to 70 °C max. At high altitude (2000–6000 m above sea level), knock off 7.5% per 1000 m or drop ambient temperature 5 K per 1000 m — whichever fits your install site. Output regulation is tight: Vout = Vin – approx. 0.5 V, so keep input between 24 and 28.8 V DC. The relay contact (changeover, 8 A/240 V AC / 24 V DC) signals OK when both input voltages exceed the switching threshold (adjustable 20–25 V). Green LED for good, red for fault. Galvanic isolation is SELV per EN 60950-1. No-load power draw max 1.5 W, meaning it's not burning standby watts on your panel control circuit.

Compliance lock – what certs ride with it

CE marked, IP20 finger-safe enclosure, Class III operating resource. Emissions per EN 55022 Class B (suitable for residential and light industrial). Immunity per EN 61000-6-2. If your spec demands these, the part has them on the label.

Frequently asked questions

What clearance is needed above and below this power supply?

The spec calls for 50 mm clearance above and 50 mm below the unit for natural convection cooling. Left and right sides can be flush (0 mm clearance).

What compliance documentation does this unit carry?

CE marked, IP20, Class III. Emissions per EN 55022 Class B, immunity per EN 61000-6-2. Galvanic isolation is SELV per EN 60950-1. These are listed on the label and can be provided with the shipment.

MPN
6AG1961-3BA21-4AX0