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Siemens 3RV1042-4MB10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1042-4MB10 SIRIUS Motor Protection Circuit Breake

MPN3RV1042-4MB10

Siemens SIRIUS 3RV1042-4MB10, motor protection circuit breaker, 100 A, 45 kW at 400 V, 100 kA breaking capacity, Class 20, screw terminals, IP20 front, DIN rail mount.

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

3RV1042-4MB10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1042-4MB10 — Electrical
ParameterValue
Rated voltage690 V
Rated voltage, AC-3 (max.)690 V
Rated impulse withstand voltage (Uimp)6 000 V
Number of poles3
Power loss (AC, hot)44 W
Power loss, per pole (AC, hot)14.7 W
3RV1042-4MB10 — Protection & Tripping
ParameterValue
Overload release setting range80 ... 100 A
Trip classCLASS 20
Breaking capacity at 240 V (AC)100 kA
Breaking capacity at 400 V (AC)100 kA
Breaking capacity at 500 V (AC)10 kA
Breaking capacity at 690 V (AC)6 kA
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1042-4MB10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1042-4MB10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals with box terminals
Main-circuit connector arrangementfront side
Conductor cross-section, finely stranded with ferrule2x (2.5 ... 35 mm²), 2.5 ... 50 mm²
Conductor range, AWG (main contacts)2x (10 ... 1), 1x (10 ... 2)
3RV1042-4MB10 — Mechanical
ParameterValue
Height165 mm
Width70 mm
Depth174 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Mounting positionany
3RV1042-4MB10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1042-4MB10 — Specifications
ParameterValue
Design Of The Productfor motor protection

Product details

Rated voltage goes to 690 V AC (AC-3), with breaking capacity derating to 6 kA at that voltage.

Trip class and protection features

Trip Class 20 means the bimetal overload element allows a 7.2× cold-start current for up to 20 seconds before tripping — standard for general-purpose induction motors driving pumps, fans, and compressors. Ground fault detection is not included — if that is required, an external ground-fault module or a different SIRIUS variant is needed.

Mounting position is any. Zero clearance required at the sides and rear — adjacent devices can be butted directly, saving rail space in a dense panel. The 70 mm width and 165 mm height fit a standard motor starter footprint; depth is 174 mm, which matters when the gland plate depth is tight. Screw-type box terminals on the main circuit accept solid 2x (2.5…16 mm²) or stranded 2x (10…50 mm²) / 1x (10…70 mm²). Auxiliary and control circuit terminals are also screw-type. An auxiliary switch can be added.

Shock resistance rated at 25g / 11 ms. Substance prohibition date of 07/01/2006 aligns with RoHS compliance (lead, mercury, cadmium, etc. restricted).

Frequently asked questions

How do I get current pricing and availability for 3RV1042-4MB10?

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

What is the breaking capacity of 3RV1042-4MB10 at 400 V?

100 kA at 400 V AC. At 500 V it derates to 10 kA, and at 690 V to 6 kA.

What is the continuous current rating of 3RV1042-4MB10?

100 A continuous rated current. Motor rating is 45 kW at 400 V.

What is the trip class of 3RV1042-4MB10?

Trip Class 20, meaning the overload element allows a 7.2× cold-start current for up to 20 seconds before tripping.

Does 3RV1042-4MB10 include phase failure detection?

Yes, phase failure detection is built in. Ground fault detection is not included.

MPN
3RV1042-4MB10