BOM / RFQ

Siemens 3RV1421-0JA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-0JA10 SIRIUS Circuit Breaker, 1 A, Class 10,

MPN3RV1421-0JA10

Siemens SIRIUS circuit breaker, 3RV1421-0JA10, for transformer protection, 1 A continuous rated current, Class 10 trip, 100 kA breaking capacity at 400 V AC, 3-pole, 45 mm wide, screw terminals, IP20 front.

Add to RFQ

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

Specifications

3RV1421-0JA10 — Identification
Parameter	Value
Series	SIRIUS
Product designation	circuit breaker

3RV1421-0JA10 — Electrical
Parameter	Value
Rated voltage	690 V
Rated voltage, AC-3 (max.)	690 V
Rated impulse withstand voltage (Uimp)	6 000 V
Number of poles	3
Power loss (AC, hot)	7.25 W
Power loss, per pole (AC, hot)	2.4 W

3RV1421-0JA10 — Protection & Tripping
Parameter	Value
Overload release setting range	0.7 ... 1 A
Trip class	CLASS 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 detection	Yes
Ground-fault detection	No
Auxiliary switch extendable	Yes

3RV1421-0JA10 — Endurance & Switching
Parameter	Value
Auxiliary CO (changeover) contacts	0

3RV1421-0JA10 — Connections
Parameter	Value
Main-circuit terminal type	screw-type terminals
Main-circuit connector arrangement	front side
Conductor cross-section, finely stranded with ferrule	2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)
Conductor range, AWG (main contacts)	2x (14 ... 10)

3RV1421-0JA10 — Mechanical
Parameter	Value
Height	97 mm
Width	45 mm
Depth	96 mm
Mounting method	screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Mounting position	any

3RV1421-0JA10 — Environmental
Parameter	Value
Operating temperature	-20 ... +60 °C
Storage temperature	-50 ... +80 °C
Transport temperature	-50 ... +80 °C
Max. installation altitude	2 000 m

3RV1421-0JA10 — Specifications
Parameter	Value
Design Of The Product	for transformer protection

Product details

Breaking capacity is a flat 100 kA across the board — 240 V, 400 V, 500 V, and 690 V AC — so it handles high-fault-current scenarios without cascading upstream.

The 45 mm width and 96 mm depth mean it fits standard panel layouts — no extra clearance needed behind the rail. Any mounting position works, and it's rated for 25g / 11 ms shock — fine for most industrial machinery and conveyors.

Wiring and thermal considerations

Terminals accept solid or stranded wire: 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²) per clamp, or 2x (14 to 10 AWG). Finely stranded with ferrule is also supported. Power dissipation runs 7.25 W total in hot operating state, or 2.4 W per pole — factor that into your panel's thermal budget, especially in a crowded DIN rail.