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Siemens 3RV1421-0HA10-ZW96 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-0HA10-ZW96 SIRIUS Circuit Breaker, 0.8 A, Cl

MPN3RV1421-0HA10-ZW96

Siemens SIRIUS circuit breaker, 3RV1421-0HA10-ZW96, for transformer protection, 0.8 A, Class 10, 100 kA at 400 V, screw terminals, IP20, DIN rail.

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

Specifications

3RV1421-0HA10-ZW96 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-0HA10-ZW96 — 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)7.25 W
Power loss, per pole (AC, hot)2.4 W
3RV1421-0HA10-ZW96 — Protection & Tripping
ParameterValue
Overload release setting range0.55 ... 0.8 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)100 kA
Breaking capacity at 690 V (AC)100 kA
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1421-0HA10-ZW96 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1421-0HA10-ZW96 — 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)
Conductor range, AWG (main contacts)2x (14 ... 10)
3RV1421-0HA10-ZW96 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Mounting positionany
3RV1421-0HA10-ZW96 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1421-0HA10-ZW96 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

The Siemens 3RV1421-0HA10-ZW96 is a SIRIUS circuit breaker for transformer protection with Class 10 release. Rated at 0.8 A continuous and 100 kA breaking capacity at 690 V, it clears faults without cascading upstream.

The 45 mm width (three-pole footprint) matches the SIRIUS family spacing, so it aligns with contactors and overloads on the same rail. Screw-type terminals on both main and auxiliary circuits accept 2x (1... 2.5 mm²) solid or stranded, or 2x (2.5... 6 mm²) — no special ferruling needed for the larger range.

The 0.8 A continuous rating sets the transformer primary FLA it can carry; don't oversize it beyond that or you lose the overload protection. Power dissipation is 7.25 W at rated load (2.4 W per pole) — negligible for panel thermal budgeting in a ventilated enclosure.

Frequently asked questions

Will 3RV1421-0HA10-ZW96 drop into a panel specified around 3RV1011-0HA10?

Yes — both use the same 45 mm width, 35 mm DIN rail mounting, and screw-type terminals. The footprint is identical, so no rewiring or rail repositioning is needed. The difference is the protection curve: transformer vs. motor.

MPN
3RV1421-0HA10-ZW96