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Siemens 3RV1042-4LA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1042-4LA10 SIRIUS Motor Protection Circuit Breake

MPN3RV1042-4LA10

Siemens SIRIUS 3RV1042-4LA10 motor protection circuit breaker, 90 A continuous, 45 kW at 400 V, Trip Class 10, 3-pole, screw terminals, IP20, DIN rail mount.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RV1042-4LA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1042-4LA10 — 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)38 W
Power loss, per pole (AC, hot)12.7 W
3RV1042-4LA10 — Protection & Tripping
ParameterValue
Overload release setting range70 ... 90 A
Trip classCLASS 10
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
3RV1042-4LA10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1042-4LA10 — 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
3RV1042-4LA10 — Mechanical
ParameterValue
Height165 mm
Width70 mm
Depth174 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022
Mounting positionany
3RV1042-4LA10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1042-4LA10 — Specifications
ParameterValue
Design Of The Productfor motor protection

Product details

The Siemens SIRIUS 3RV1042-4LA10 is a 3-pole motor protection circuit breaker rated for 90 A continuous current, switching 45 kW at 400 V AC in AC-3 duty. The 100 kA breaking capacity at 400 V AC handles high-fault-current panels; at 690 V AC the rating drops to 6 kA, so verify SCCR coordination when feeding a 690 V motor. Screw-type box terminals on the main circuit accept solid 2x (2.5…16 mm²) or stranded 2x (10…50 mm²); auxiliary and control circuits use separate screw terminals.

The 3RV1042-4LA10 occupies a 70 mm wide footprint on the DIN rail. Zero clearance required at the sides or back — adjacent breakers or contactors can butt directly. Mounting position is unrestricted: horizontal, vertical, or flat. The screw terminals accept up to 70 mm² stranded on the main circuit, which covers most motor feeder cables up to 90 A. Power dissipation is 38 W total (12.7 W per pole) in hot operating state; account for that heat in a sealed enclosure.

Shock resistance is 25 g for 11 ms. The part is RoHS-compliant per the 2006/07/01 substance prohibition date. Touch protection is finger-safe (IP20 on the front).

Frequently asked questions

What is the breaking capacity of the 3RV1042-4LA10 at different voltages?

At 240 V and 400 V AC the breaking capacity is 100 kA. At 500 V AC it drops to 10 kA, and at 690 V AC to 6 kA. Verify SCCR coordination at your system voltage.

Will the 3RV1042-4LA10 drop into a panel specified for the 3RV6021-4DA10?

Both are SIRIUS motor protection circuit breakers on the same DIN-rail footprint, but the 3RV6021-4DA10 is a different current rating and breaking capacity class. Check the panel's wire sizing and SCCR coordination before substituting — the 3RV1042-4LA10 is rated for higher continuous current (90 A vs the 3RV6021-4DA10's rating) and may require larger conductors.

Where can I buy the 3RV1042-4LA10?

This part is sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time.

What compliance documentation does Siemens provide for the 3RV1042-4LA10?

The part is RoHS-compliant per the 2006/07/01 substance prohibition date. Standard Siemens documentation includes the datasheet, CE declaration of conformity, and UL/CSA file information — request these with your RFQ.

MPN
3RV1042-4LA10