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Siemens 3VA2125-8KQ42-0AA0 — Molded Case Circuit Breakers (MCCB)

Siemens 3VA2125-8KQ42-0AA0 SENTRON MCCB, 25 A, 4-Pole, 440 k

MPN3VA2125-8KQ42-0AA0
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Siemens SENTRON 3VA series, molded case circuit breaker (MCCB), 3VA2125-8KQ42-0AA0, 4-pole, 25 A rated continuous current, 440 kA breaking capacity at 240 V AC.

Siemens 3VA2125-8KQ42-0AA0 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

3VA2125-8KQ42-0AA0 — Identification
ParameterValue
Product designationMolded case circuit breaker
Brand / rangeSENTRON
3VA2125-8KQ42-0AA0 — 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 classL
Breaking capacity at 240 V440 kA
Breaking capacity at 415 V330 kA
Breaking capacity at 440 V330 kA
Breaking capacity at 500 V220 kA
Breaking capacity at 690 V52.5 kA
Power loss, max.0.5 W
3VA2125-8KQ42-0AA0 — Protection & Trip Unit
ParameterValue
Overcurrent release (trip unit) typeETU860
Overcurrent protection functionLSIG
Ground-fault monitoringSummation current formation L + N conductor
Grounding protection functionYes
3VA2125-8KQ42-0AA0 — Construction & Connection
ParameterValue
Main circuit connection typeon both sides nut keeper kit
Main circuit connector arrangementFront terminal
Protection class (IP), frontIP40
3VA2125-8KQ42-0AA0 — Accessories & Functions
ParameterValue
Undervoltage releaseNo
Voltage triggerNo
Trip indicatorNo
Communication functionYes
Measurement functionYes
Motor drive optionYes
Auxiliary CO contacts0
3VA2125-8KQ42-0AA0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-25 °C
Storage temperature, max.80 °C
Storage temperature, min.-40 °C
3VA2125-8KQ42-0AA0 — 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

The Siemens 3VA2125-8KQ42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current, with a 4-pole configuration and a breaking capacity of 440 kA at 240 V AC.

Breaking capacity drops from 440 kA at 240 V to 330 kA at 415 V and 440 V, then to 220 kA at 500 V, and 52.5 kA at 690 V.

Thermal performance and derating

The minimum adjustable trip setting is 38 A, and the maximum is 300 A, so the breaker can be dialed to protect a range of downstream loads. The 0.5 W maximum power loss is low enough that multiple units can be ganged in a panel without forced cooling.

The communication function and ground-fault monitoring (summation current L+N) mean it can report trip events and leakage to a PLC or BMS without an add-on module. No undervoltage release or voltage-trigger function is built in, so external trip coils would be needed for those schemes.

Frequently asked questions

What is the breaking capacity of 3VA2125-8KQ42-0AA0 at different voltages?

The breaking capacity is 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V AC.

Where can I buy 3VA2125-8KQ42-0AA0 and how is it quoted?

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

MPN
3VA2125-8KQ42-0AA0