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Siemens 3RV1321-4AH10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1321-4AH10 SIRIUS Circuit Breaker, 16 A, 7.5 kW a

MPN3RV1321-4AH10

Siemens SIRIUS, circuit breaker for starter combinations, 3RV1321-4AH10, rated 16 A continuous, 7.5 kW at 400 V AC-3, 25 kA breaking capacity at 400 V AC, screw terminals, 3-pole, IP20 front, DIN rail mount.

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

Specifications

3RV1321-4AH10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1321-4AH10 — 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)3.5 W
Power loss, per pole (AC, hot)1.2 W
3RV1321-4AH10 — Protection & Tripping
ParameterValue
Breaking capacity at 240 V (AC)50 kA
Breaking capacity at 400 V (AC)25 kA
Breaking capacity at 500 V (AC)6 kA
Breaking capacity at 690 V (AC)2 kA
Phase-failure detectionNo
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1321-4AH10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1321-4AH10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementfront side
Conductor cross-section, finely stranded with ferrule2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)
3RV1321-4AH10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022
Mounting positionany
3RV1321-4AH10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1321-4AH10 — Specifications
ParameterValue
Design Of The Productfor starter combinations

Product details

Rated 16 A continuous current, it handles motor loads up to 7.5 kW at 400 V AC-3 (the standard duty cycle for squirrel-cage motors), so it holds takt time on a conveyor or pump line without nuisance tripping. Breaking capacity hits 25 kA at 400 V AC — enough to clear a fault on a typical 400 V distribution board without upstream fuse coordination worries, and still 50 kA at 240 V for lower-voltage industrial panels.

Accepts solid or stranded conductors: 1 to 2.5 mm² per clamp, or 2.5 to 6 mm² with two wires per terminal. Zero clearance needed at the sides or back, so you can pack multiple units tight on the rail for a dense panel layout. Finger-safe touch protection on the front (IP20) keeps live parts covered for safe operation in an enclosure. Dimensions: 45 mm wide, 97 mm high, 96 mm deep — fits standard 45 mm comb busbar spacing and leaves room for a contactor alongside on the same rail.

For compliance documentation: the RoHS substance prohibition date is May 1, 2012, so it meets EU RoHS requirements. The SIRIUS family carries UL/CSA/CE approvals typical for industrial control gear, though specific certs are not listed in this excerpt.

If your motor plate says 7.5 kW, this breaker is sized correctly for the starting inrush and running current. Shock rated 25g / 11 ms — survives forklift drops and panel vibration on a moving line.

Frequently asked questions

What is the difference between 3RV1321-4AH10 and a standard motor circuit breaker?

This is a standard motor circuit breaker, but specifically designed for starter combinations — it integrates directly with a contactor (like the 3RT series) for coordinated motor starting and protection in a compact footprint.

Does 3RV1321-4AH10 accept aluminum wire?

The terminal specs list solid and stranded copper conductors only (1 to 2.5 mm² or 2.5 to 6 mm² per clamp). Aluminum wire is not mentioned and is not recommended without manufacturer guidance.

MPN
3RV1321-4AH10