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Siemens 3RV2742-5HD10 — Motor Protection Circuit Breakers (MPCB)

Siemens SIRIUS 3RV2742-5HD10 Circuit Breaker, 45 A, 100 kA a

MPN3RV2742-5HD10
Active

Siemens SIRIUS circuit breaker, 3RV2742-5HD10, S3 frame, 45 A rated operational current, 100 kA breaking capacity at 240 V AC, UL 489 system protection.

Siemens 3RV2742-5HD10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2742-5HD10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS3
3RV2742-5HD10 — Electrical
ParameterValue
Rated operational current (Ie)45 A
Rated voltage20 ... 600 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)18 W
Power loss, per pole (AC, hot)6 W
3RV2742-5HD10 — Protection & Tripping
ParameterValue
Instantaneous short-circuit trip current585 A
Breaking capacity at 240 V (AC)100 kA
Breaking capacity at 400 V (AC)100 kA
Breaking capacity at 240 V100 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionNo
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2742-5HD10 — Endurance & Switching
ParameterValue
Endurance, main contacts (typ.)25 000
Endurance, auxiliary contacts (typ.)25 000
3RV2742-5HD10 — 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)
Conductor range, AWG (main contacts)8
3RV2742-5HD10 — Mechanical
ParameterValue
Height170 mm
Width70 mm
Depth176 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting positionany
3RV2742-5HD10 — 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
3RV2742-5HD10 — Specifications
ParameterValue
Design Of The ProductFor system protection according to UL 489/CSA C22.2 No. 5

Product details

The Siemens SIRIUS 3RV2742-5HD10 is a Size S3 circuit breaker designed for system protection per UL 489 / CSA C22.2 No. 5. It carries a 45 A rated operational current and delivers 100 kA breaking capacity at 240 V AC, with the same 100 kA at 400 V AC — meaning it can safely interrupt fault currents up to that level without cascading upstream, a key spec for panel coordination studies.

Dimensions are 170 mm high, 70 mm wide, 176 mm deep, with required clearances of 70 mm above and below, 10 mm at the sides — a compact S3 footprint that fits standard panel layouts. Main circuit terminals accept solid or stranded wire: 2x (2.5 … 16 mm²) or 1x (10 … 70 mm²); auxiliary contacts take 2x (2.5 … 16 mm²). Screw-type terminals with M8 main-contact screws, hex-socket driver (4 mm tip). AWG 8 for main contacts.

Lifecycle status is active (current production).

Substance prohibitance (RoHS) compliance date is 03/01/2017. Relative humidity during operation 10 to 95 %. No ground-fault or phase-failure detection built in.

Frequently asked questions

What is the breaking capacity of 3RV2742-5HD10?

100 kA at 240 V AC and also 100 kA at 400 V AC.

What wire sizes does the 3RV2742-5HD10 accept?

Main contacts accept 2x (2.5 … 16 mm²) solid/stranded or 1x (10 … 70 mm²); auxiliary contacts accept 2x (2.5 … 16 mm²).

Where can I buy 3RV2742-5HD10?

Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

MPN
3RV2742-5HD10