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Siemens 3VA2125-6KQ42-0DK0 — Molded Case Circuit Breakers (MCCB)

Siemens 3VA2125-6KQ42-0DK0 SENTRON MCCB, 4P, 25 A, 242 kA at

MPN3VA2125-6KQ42-0DK0

Siemens SENTRON 3VA2125-6KQ42-0DK0, molded case circuit breaker, 4-pole, 25 A, 242 kA at 240 V, line protection, with undervoltage release and auxiliary switches.

Siemens 3VA2125-6KQ42-0DK0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3VA2125-6KQ42-0DK0 — Identification
ParameterValue
Product designationMolded case circuit breaker
Brand / rangeSENTRON
Basic switch (supplied) ref.3VA21256KQ420AA0
Integrated auxiliary / alarm switch ref.3VA9988-0AB22
3VA2125-6KQ42-0DK0 — Ratings
ParameterValue
Number of poles4
Rated operational voltage Ue (AC)690 V
Rated insulation voltage Ui800 V
Current at 40 °C25 A
Current at 45 °C25 A
Current at 50 °C25 A
Current at 55 °C25 A
Current at 60 °C25 A
Current at 65 °C25 A
Current at 70 °C25 A
Switching capacity classH
Breaking capacity at 240 V242 kA
Breaking capacity at 415 V187 kA
Breaking capacity at 440 V187 kA
Breaking capacity at 500 V121 kA
Breaking capacity at 690 V3.7 kA
Power loss, max.3 W
3VA2125-6KQ42-0DK0 — Protection & Trip Unit
ParameterValue
Overcurrent release (trip unit) typeETU860
Overcurrent protection functionLSIG
Ground-fault monitoringSummation current formation L + N conductor
Grounding protection functionYes
3VA2125-6KQ42-0DK0 — Construction & Connection
ParameterValue
Main circuit connection typeon both sides nut keeper kit
Main circuit connector arrangementFront terminal
Protection class (IP), frontIP40
3VA2125-6KQ42-0DK0 — Accessories & Functions
ParameterValue
Undervoltage releaseYes
Voltage triggerNo
Trip indicatorYes
Communication functionYes
Measurement functionYes
Motor drive optionYes
Auxiliary CO contacts3
3VA2125-6KQ42-0DK0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-25 °C
Storage temperature, max.80 °C
Storage temperature, min.-40 °C
3VA2125-6KQ42-0DK0 — Mechanical
ParameterValue
Mechanical service life (operating cycles), typ.25 000
Height181 mm
Width140 mm
Depth86 mm
Height (in)7.13 in
Width (in)5.51 in
Depth (in)3.39 in

Product details

That simplifies panel layout in warm enclosures or near heat sources.

The 3VA2125-6KQ42-0DK0 measures 86 mm deep by 140 mm wide by 181 mm high — a standard SENTRON 3VA footprint that drops into existing panel cutouts and DIN-rail mounting schemes. The 4-pole body occupies the same width as the 3-pole variant plus one pole space; plan your busbar and gland-plate layout accordingly.

With a minimum trip setting of 1.5 A and a maximum of 40 A, this breaker covers a wide branch range. The 242 kA SCCR at 240 V gives headroom for transformer-fed panels where upstream devices are already coordinated. The communication function (listed as present) allows integration into a monitoring system — useful for remote trip indication or load shedding.

Frequently asked questions

Where can I buy 3VA2125-6KQ42-0DK0?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the interrupting capacity of 3VA2125-6KQ42-0DK0 at 240 V?

242 kA at 240 V, dropping to 187 kA at 415 V and 3.7 kA at 690 V.

Does 3VA2125-6KQ42-0DK0 include an undervoltage release?

Yes, it comes with an undervoltage release (UVR) plus one auxiliary switch, one trip alarm switch, and one electrical alarm switch HQ.

MPN
3VA2125-6KQ42-0DK0