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Siemens 3VA2125-6KQ42-0AA0 — Molded Case Circuit Breakers (MCCB)

Siemens 3VA2125-6KQ42-0AA0 SENTRON MCCB, 25 A, 4-Pole, 242 k

MPN3VA2125-6KQ42-0AA0
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Siemens SENTRON 3VA2125-6KQ42-0AA0, molded case circuit breaker, 4-pole, 25 A continuous rating, 242 kA breaking capacity at 240 V AC, line protection design with ground-fault monitoring.

Siemens 3VA2125-6KQ42-0AA0 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3VA2125-6KQ42-0AA0 — Identification
ParameterValue
Product designationMolded case circuit breaker
Brand / rangeSENTRON
3VA2125-6KQ42-0AA0 — 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.0.6 W
3VA2125-6KQ42-0AA0 — Protection & Trip Unit
ParameterValue
Overcurrent release (trip unit) typeETU860
Overcurrent protection functionLSIG
Ground-fault monitoringSummation current formation L + N conductor
Grounding protection functionYes
3VA2125-6KQ42-0AA0 — Construction & Connection
ParameterValue
Main circuit connection typeon both sides nut keeper kit
Main circuit connector arrangementFront terminal
Protection class (IP), frontIP40
3VA2125-6KQ42-0AA0 — Accessories & Functions
ParameterValue
Undervoltage releaseNo
Voltage triggerNo
Trip indicatorNo
Communication functionYes
Measurement functionYes
Motor drive optionYes
Auxiliary CO contacts0
3VA2125-6KQ42-0AA0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-25 °C
Storage temperature, max.80 °C
Storage temperature, min.-40 °C
3VA2125-6KQ42-0AA0 — 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

Its breaking capacity is what decides the fit for your fault-current study: 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. Insulation voltage is rated 800 V, so the breaker is suitable for 480/277 V and 600/347 V systems with margin.

Communication function is onboard, which for the 3VA2 platform typically means a modular communication-capable trip unit that can report status and measured values over a fieldbus gateway — useful for remote monitoring without adding an external power meter.

Lifecycle and compliance posture

For compliance documentation: the 3VA2 series carries CE marking under the Low Voltage Directive, UL 489 listing for the North American market, and RoHS/REACH declarations from Siemens. The ground-fault monitoring variant (summation current) meets the requirements of IEC 60947-2 Annex B for residual current protection.

Frequently asked questions

Where can I buy 3VA2125-6KQ42-0AA0 and get a price?

This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What is the breaking capacity of this MCCB at 415 V?

The breaking capacity is 187 kA at 415 V AC, matching the rating at 440 V. At 240 V it reaches 242 kA, and at 690 V it is 3.7 kA.

Does the 3VA2125-6KQ42-0AA0 include ground-fault protection?

Yes, it is equipped with ground-fault monitoring using summation current formation on the L+N conductors, per IEC 60947-2 Annex B. This detects residual currents without requiring a separate core-balance transformer.

Will this breaker drop into a panel specified for 3VA2163-8JQ32-0AA0?

The 3VA2125-6KQ42-0AA0 shares the same SENTRON 3VA2 platform dimensions (181 x 140 x 86 mm) and mounting pattern as the 3VA2163-8JQ32-0AA0, so it fits the same enclosure cutout and busbar arrangement. The difference is in the trip unit rating and breaking capacity — verify the fault-current study supports the 25 A frame before substituting.

MPN
3VA2125-6KQ42-0AA0