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Siemens 6AG1961-3BA21-7AX0 — PLCs (Programmable Logic Controllers)

Siemens 6AG1961-3BA21-7AX0 DC/DC Converter 24V 40A, 96.6% Ef

MPN6AG1961-3BA21-7AX0
Active

Siemens 6AG1961-3BA21-7AX0, a DC/DC converter, 24V DC output rated 40A, 96.6% efficiency, DIN rail mount with zero side clearance gap.

Siemens 6AG1961-3BA21-7AX0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6AG1961-3BA21-7AX0 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

6AG1961-3BA21-7AX0 additional specifications
ParameterValue
In horizontal mounting position during operation-40 ... +70 °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

Derating and installation conditions

The 6AG1961-3BA21-7AX0: Rated 40 A up to +60 °C ambient; above that derate 3 % per K. At altitudes 2000–6000 m above sea level, derate output power by 7.5 % per 1000 m or reduce ambient temperature by 5 K per 1000 m. Designed for horizontal mounting with natural convection. Storage and transport range -40... +85 °C.

Status signaling and isolation

A galvanically isolated relay contact (SELV per EN 60950-1) signals OK when both input voltages exceed a switching threshold adjustable between 20... 25 V. The contact is a changeover rated 8 A at 240 V AC / 24 V DC. Two LEDs: green for 'both inputs OK', red if at least one falls below threshold.

Frequently asked questions

What clearance does this unit need on a DIN rail?

Top and bottom clearance 50 mm each; left and right 0 mm. Units can be mounted side-by-side without gap.

MPN
6AG1961-3BA21-7AX0