Siemens 3RH1921-1EA02 SIRIUS Auxiliary Switch, 10 A, S0

Name: 3RH1921-1EA02
Brand: Siemens
SKU: 3RH1921-1EA02
Availability: LimitedAvailability
Author: Spares Sergei

Specifications

Identification

3RH1921-1EA02 — Identification
Parameter	Value
Contactor frame size	S0

Ratings & Performance

3RH1921-1EA02 — Ratings & Performance
Parameter	Value
Rated value @ 24 V	10 A
Rated value @ 60 V	4.7 A
Rated value @ 110 V	3 A
Rated value @ 220 V	1.2 A

Contacts & Poles

3RH1921-1EA02 — Contacts & Poles
Parameter	Value
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

Connection & Mounting

3RH1921-1EA02 — Connection & Mounting
Parameter	Value
Conductor cross-section, solid or stranded	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting method	snap-on mounting

Environmental

3RH1921-1EA02 — Environmental
Parameter	Value
Operating temperature range	-25 ... +60 °C
Storage temperature range	-55 ... +80 °C

Mechanical

3RH1921-1EA02 — Mechanical
Parameter	Value
Width	10 mm
Height	80 mm
Depth	71 mm

Product details

Active production, S0 auxiliary switch for contactor relays

The 3RH1921-1EA02: It snaps onto the contactor without extra hardware, adding auxiliary contact capacity to the assembly.

Rated currents and contact ratings across voltages

For AC-12 duty, the maximum operational current is 10 A; at 440 V AC the current drops to 0.5 A.

Compliance and reliability benchmarks

The switch provides a mirror contact per IEC 60947-4-1 when used with 3RT1 contactors, enabling fail-safe feedback in safety circuits. Meets RoHS substance prohibition date of July 1, 2006.

Frequently asked questions

Where can I buy 3RH1921-1EA02 and how do I get a price?

Submit a request with your BOM quantity for current pricing and availability confirmation at quote time.

What compliance documentation does Siemens provide for 3RH1921-1EA02?

The switch complies with RoHS (substance prohibition date July 1, 2006) and carries a rated insulation voltage of 500 V at pollution degree 3 with 6 kV surge voltage resistance.