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Siemens 3RV1042-4KA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1042-4KA10 SIRIUS Motor Protection Circuit Breake

MPN3RV1042-4KA10

Siemens SIRIUS motor protection circuit breaker, 3RV1042-4KA10, 75 A continuous rated current, 37 kW at 400 V, Class 10 trip, screw terminals, DIN rail mount.

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

Specifications

3RV1042-4KA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1042-4KA10 — 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
3RV1042-4KA10 — Protection & Tripping
ParameterValue
Overload release setting range57 ... 75 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
3RV1042-4KA10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1042-4KA10 — 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
3RV1042-4KA10 — 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
3RV1042-4KA10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1042-4KA10 — Specifications
ParameterValue
Design Of The Productfor motor protection

Product details

The Siemens 3RV1042-4KA10 is a SIRIUS motor protection circuit breaker rated for 75 A continuous current, switching 37 kW at 400 V in AC-3 duty.

The 70 mm wide body leaves room for adjacent devices in a crowded panel — backwards clearance is 0 mm, side clearance 0 mm, so it can sit flush against other components. Main circuit terminals accept solid conductors 2x (2.5 … 16 mm²) or stranded 2x (10 … 50 mm²) and up to 1x 70 mm². Auxiliary and control circuit terminals are screw-type, sized for 2x (2.5 … 16 mm²) solid or 2x (2.5 … 35 mm²) finely stranded with ferrules.

Protection and environment

Ground fault detection is not included. Front protection is IP20 (finger-safe touch protection). Shock rated at 25 g for 11 ms. Power dissipation in hot operating state is 38 W total, 12.7 W per pole.

Frequently asked questions

Where can I buy 3RV1042-4KA10 and 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 for a firm price and lead time.

What is the breaking capacity of 3RV1042-4KA10 at different voltages?

Breaking capacity is 100 kA at 240 V AC and 400 V AC, 10 kA at 500 V AC, and 6 kA at 690 V AC. The 100 kA rating at 400 V covers most industrial distribution panel fault levels without requiring upstream current-limiting fuses.

What compliance documentation does Siemens provide for 3RV1042-4KA10?

The part carries RoHS compliance with a substance prohibitance date of 2006-07-01. As a SIRIUS motor protection circuit breaker, it is designed to meet IEC 60947-2 and UL 489 standards. Declaration of conformity and certificates are available through standard Siemens documentation channels.

MPN
3RV1042-4KA10