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Siemens 3RV2042-4JB10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2042-4JB10 SIRIUS Motor Protection Circuit Breake

MPN3RV2042-4JB10
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Siemens SIRIUS 3RV2042-4JB10 motor protection circuit breaker, Class 20, screw-type terminals, 100 kA interrupting capacity at 240/400 V AC, 35 mm DIN rail mount.

$204.47Ref. price · indicative, final on quote
Siemens 3RV2042-4JB10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2042-4JB10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS3
3RV2042-4JB10 — Electrical
ParameterValue
Rated operational current (Ie)63 A
Rated voltage20 ... 690 V
Rated voltage, AC-3 (max.)690 V
Rated frequency50 ... 60 Hz
Rated insulation voltage (Ui), pollution degree 31 000 V
Rated impulse withstand voltage (Uimp)8 kV
Number of poles3
Power loss (AC, hot)34 W
Power loss, per pole (AC, hot)11.3 W
3RV2042-4JB10 — Protection & Tripping
ParameterValue
Overload release setting range45 ... 63 A
Instantaneous short-circuit trip current819 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)15 kA
Breaking capacity at 690 V (AC)7.5 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V4 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2042-4JB10 — Endurance & Switching
ParameterValue
Endurance, main contacts (typ.)25 000
Endurance, auxiliary contacts (typ.)25 000
Switching frequency, AC-3 (max.)15 1/h
3RV2042-4JB10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (2,5 ... 50 mm²), 1x (10 ... 70 mm²)
Conductor cross-section, finely stranded with ferrule2x (2.5 ... 35 mm²), 1x (2.5 ... 50 mm²)
3RV2042-4JB10 — Mechanical
ParameterValue
Height165 mm
Width70 mm
Depth176 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting positionany
3RV2042-4JB10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Relative humidity (operation)10 ... 95 %
Max. installation altitude2 000 m
3RV2042-4JB10 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

The Siemens 3RV2042-4JB10 is a SIRIUS motor protection circuit breaker rated for Class 20 trip characteristics, meaning it allows a 20-second overload before tripping — sized for standard induction motor starts without nuisance trips on the inrush curve. It carries a 100 kA interrupting capacity at both 240 V AC and 400 V AC, so it can handle high-fault utility feeds without cascading upstream breakers.

The screw-type terminals on the main circuit accept 2x (2.5... 16 mm²) solid or stranded, with a larger option of 1x (10... 70 mm²) for the line side. Depth is 176 mm, width 70 mm, height 165 mm — fits a standard 200 mm deep enclosure with clearance for the 150 mm upward and downward wiring space.

Lifecycle stage is marked as current production.

Frequently asked questions

What is the interrupting capacity of 3RV2042-4JB10 at 400 V?

50 kA at 400 V, and 100 kA at both 240 V AC and 400 V AC.

Where can I buy 3RV2042-4JB10?

This part is sourced and quoted to order against an RFQ through independent distribution, with availability and current pricing confirmed at quote time.

What is the trip class of 3RV2042-4JB10?

Class 20, which allows a 20-second overload before tripping — appropriate for standard motor starts.

Does 3RV2042-4JB10 detect phase failure?

Yes, phase failure detection is built in to protect motors from single-phasing.

MPN
3RV2042-4JB10