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Siemens 3VA2125-0HN42-0AA0 — Molded Case Circuit Breakers (MCCB)

Siemens 3VA2125-0HN42-0AA0 SENTRON MCCB, 25 A, 4-Pole, ETU35

MPN3VA2125-0HN42-0AA0
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Siemens SENTRON 3VA2125-0HN42-0AA0, molded case circuit breaker, 4-pole, 25 A rated continuous current, ETU350 electronic trip unit, line protection design, IP40 front.

Siemens 3VA2125-0HN42-0AA0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3VA2125-0HN42-0AA0 — Identification
ParameterValue
Product designationMolded case circuit breaker
Brand / rangeSENTRON
3VA2125-0HN42-0AA0 — 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 classE
Breaking capacity at 415 V440 kA
Breaking capacity at 690 V187 kA
Power loss, max.0.5 W
3VA2125-0HN42-0AA0 — Protection & Trip Unit
ParameterValue
Overcurrent release (trip unit) typeETU350
Overcurrent protection functionLSI
Ground-fault monitoringWithout
Grounding protection functionNo
3VA2125-0HN42-0AA0 — Construction & Connection
ParameterValue
Main circuit connection typeon both sides nut keeper kit
Main circuit connector arrangementFront terminal
Protection class (IP), frontIP40
3VA2125-0HN42-0AA0 — Accessories & Functions
ParameterValue
Undervoltage releaseNo
Voltage triggerNo
Trip indicatorNo
Communication functionNo
Measurement functionNo
Motor drive optionYes
Auxiliary CO contacts0
3VA2125-0HN42-0AA0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-25 °C
Storage temperature, max.80 °C
Storage temperature, min.-40 °C
3VA2125-0HN42-0AA0 — 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 and what it means for your fault level

Those numbers tell you it's rated for high-fault-current installations — think industrial mains or transformer secondaries where prospective short-circuit current can exceed 100 kA. The 690 V rating also covers 600 V class北美 systems without derating the interrupt rating.

Trip unit and N-conductor protection

The ETU350 is an electronic trip unit with LSI protection curves — long-time, short-time, and instantaneous. N-conductor protection is adjustable: OFF or 100%, so you can set it for a fully rated neutral or leave it unprotected depending on the system grounding. No ground-fault monitoring version, no undervoltage release, no communication function — this is a plain-vanilla line-protection breaker, not a smart or GFCI variant.

Temperature derating — the full band

No derating needed across the normal panel temperature range. Maximum power loss is 0.5 W — negligible for panel heat budgeting.

Frequently asked questions

Where can I buy 3VA2125-0HN42-0AA0 and how do I get a price?

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

What is the depth of 3VA2125-0HN42-0AA0?

The depth is 86 mm. That's the dimension from the mounting surface to the front of the breaker — relevant for gland-plate clearance or shallow enclosure fit.

What is the width of 3VA2125-0HN42-0AA0?

The width is 140 mm. This is the standard 3VA2 frame width; a panel drilled for any 3VA2 breaker accepts this unit without rework.

What compliance documentation does Siemens provide for this MCCB?

The SENTRON 3VA2 series carries IEC 60947-2 certification as a molded case circuit breaker. Standard documentation includes the declaration of conformity, CE marking, and RoHS/REACH compliance statements — available on request with the order.

MPN
3VA2125-0HN42-0AA0