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Siemens 3VA2125-8HM42-0AA0 — Molded Case Circuit Breakers (MCCB)

Siemens 3VA2125-8HM42-0AA0 MCCB, 25 A, 4-Pole, 440 kA at 240

MPN3VA2125-8HM42-0AA0
Active

Siemens SENTRON series, molded case circuit breaker, 3VA2125-8HM42-0AA0, 25 A rated, 4-pole, 440 kA breaking at 240 VAC, line protection design.

Siemens 3VA2125-8HM42-0AA0 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

3VA2125-8HM42-0AA0 — Identification
ParameterValue
Product designationMolded case circuit breaker
Brand / rangeSENTRON
3VA2125-8HM42-0AA0 — 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
3VA2125-8HM42-0AA0 — Protection & Trip Unit
ParameterValue
Overcurrent release (trip unit) typeETU330
Overcurrent protection functionLIG
Ground-fault monitoringSummation current formation L + N conductor
Grounding protection functionYes
3VA2125-8HM42-0AA0 — Construction & Connection
ParameterValue
Main circuit connection typeon both sides nut keeper kit
Main circuit connector arrangementFront terminal
Protection class (IP), frontIP40
3VA2125-8HM42-0AA0 — Accessories & Functions
ParameterValue
Undervoltage releaseNo
Voltage triggerNo
Trip indicatorNo
Communication functionNo
Measurement functionNo
Motor drive optionYes
Auxiliary CO contacts0
3VA2125-8HM42-0AA0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-25 °C
Storage temperature, max.80 °C
Storage temperature, min.-40 °C
3VA2125-8HM42-0AA0 — 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

Breaking capacity at system voltage

This MCCB delivers 440 kA at 240 VAC, 330 kA at 415 VAC and 440 VAC, 220 kA at 500 VAC, and 52.5 kA at 690 VAC.

The 3VA2125-8HM42-0AA0 carries a current-production lifecycle status.

Ground-fault and temperature performance

The ground-fault monitoring uses summation current formation on L + N conductors — it watches the vector sum, not just a single path.

That 4-pole width is standard for a 25 A frame MCCB — it occupies one full DIN-rail mounting space on a panel backplate. Power loss is only 0.5 W maximum, so heat buildup inside a sealed enclosure is negligible.

Frequently asked questions

How do I get pricing and availability for 3VA2125-8HM42-0AA0?

Submit an RFQ through this listing. The part is sourced to order, and current pricing and stock availability are confirmed at quote time.

Will 3VA2125-8HM42-0AA0 drop into a panel specified around 5SQ2670-2YA63 without rewiring?

No — the 3VA2125-8HM42-0AA0 is a Siemens SENTRON MCCB, while the 5SQ2670-2YA63 is a different manufacturer's device. Panel footprint, bus bar centers, and terminal arrangements differ. A mechanical fit assessment is required before substitution.

What is the 3VA2125-8HM42-0AA0's depth?

The depth is 86 mm (3.39 inches), measured from the mounting surface to the front of the breaker body.

What compliance documentation does Siemens provide for this MCCB?

The 3VA2125-8HM42-0AA0 is a Siemens SENTRON series product. Standard documentation includes RoHS and REACH declarations, plus IEC 60947-2 test certificates. UL/CSA listings vary by variant — verify the specific suffix code against the manufacturer's compliance database.

MPN
3VA2125-8HM42-0AA0