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Siemens 3VA2040-8KP42-0AA0 — Molded Case Circuit Breakers (MCCB)

SENTRON 3VA2040-8KP42-0AA0 MCCB, 40 A, 4-Pole, ETU850

MPN3VA2040-8KP42-0AA0
Active

SENTRON 3VA2040-8KP42-0AA0, molded case circuit breaker, 4-pole, 40 A continuous, ETU850 electronic trip unit, line protection, IP40 front.

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

3VA2040-8KP42-0AA0 — Identification
ParameterValue
Product designationMolded case circuit breaker
Brand / rangeSENTRON
3VA2040-8KP42-0AA0 — Ratings
ParameterValue
Number of poles4
Rated operational voltage Ue (AC)690 V
Rated insulation voltage Ui800 V
Current at 40 °C40 A
Current at 45 °C40 A
Current at 50 °C40 A
Current at 55 °C40 A
Current at 60 °C40 A
Current at 65 °C40 A
Current at 70 °C40 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.1.2 W
3VA2040-8KP42-0AA0 — Protection & Trip Unit
ParameterValue
Overcurrent release (trip unit) typeETU850
Overcurrent protection functionLSI
Ground-fault monitoringWithout
Grounding protection functionNo
3VA2040-8KP42-0AA0 — Construction & Connection
ParameterValue
Main circuit connection typeon both sides nut keeper kit
Main circuit connector arrangementFront terminal
Protection class (IP), frontIP40
3VA2040-8KP42-0AA0 — Accessories & Functions
ParameterValue
Undervoltage releaseNo
Voltage triggerNo
Trip indicatorNo
Communication functionYes
Measurement functionYes
Motor drive optionYes
Auxiliary CO contacts0
3VA2040-8KP42-0AA0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-25 °C
Storage temperature, max.80 °C
Storage temperature, min.-40 °C
3VA2040-8KP42-0AA0 — 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 SENTRON 3VA2040-8KP42-0AA0 is a 4-pole molded case circuit breaker rated 40 A continuous at 40 °C, and it holds that rating flat through 70 °C — no derate curve to chase. Breaking capacity hits 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 — numbers that cover most industrial distribution panels without a series-rating dance. It's built around the ETU850 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a thermal-magnetic fixed curve.

Panel fit and footprint

Front face carries IP40 protection, meaning it's sealed against tools and wires over 1 mm but not washdown — keep it inside the enclosure, not on the panel door.

Communication and monitoring

This breaker includes a communication function and an 'other measurement function' — the ETU850 supports Modbus RTU via the SENTRON communication module, giving you load current, power, and energy data back to the PLC or BMS without a separate power meter.

Sourcing posture

Active lifecycle, standard catalog item.

Frequently asked questions

What is the breaking capacity of this MCCB at 480 V?

At 500 V it is rated 220 kA; at 440 V it is 330 kA. For a 480 V system, the 440 V rating (330 kA) is the applicable bound — conservative for most distribution panels.

Does this breaker need a separate ground-fault module?

This variant ships without ground-fault monitoring (version 'Without'), but the ETU850 trip unit itself supports ground-fault protection when paired with the correct sensor — verify the sensor configuration on your BOM.

Where can I buy 3VA2040-8KP42-0AA0?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm position.

MPN
3VA2040-8KP42-0AA0