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Siemens 3RH7122-1AQ00 — Contactors

Siemens 3RH7122-1AQ00 SIRIUS Contactor Relay, 2NO+2NC, 6A at

MPN3RH7122-1AQ00

Siemens SIRIUS contactor relay, size S00, 3RH7122-1AQ00, 2 NO + 2 NC auxiliary contacts, screw-type terminals, 6 A rated operational current at 400 V AC, IP20 front protection.

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

Specifications

3RH7122-1AQ00 — Identification
ParameterValue
Contactor frame sizeS00
3RH7122-1AQ00 — Ratings & Performance
ParameterValue
Rated value @ 400 V6 A
Rated value @ 690 V1 A
Rated value @ 230 V6 A
Rated value @ 24 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RH7122-1AQ00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz380 V
3RH7122-1AQ00 — Contacts & Poles
ParameterValue
Auxiliary contact reliabilityacceptability for PLC control (17 V, 5 mA)
3RH7122-1AQ00 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail
3RH7122-1AQ00 — Environmental
ParameterValue
Operating temperature range-10 ... +55 °C
Storage temperature range-25 ... +70 °C
Installation altitude, max.2 000 m
3RH7122-1AQ00 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth72 mm

Product details

It carries 2 normally-open and 2 normally-closed auxiliary contacts — the 22 E switching-element identifier tells you the contact stack is two NO, two NC, no main poles.

The headline switching numbers tell you where this relay earns its keep. At 400 V AC, it's rated for 6 A — that's the thermal current the contacts can make and break in AC-15 or similar inductive pilot-duty circuits. At 230 V it also carries 6 A, at 110 V it's 1 A, and at 690 V it drops to 1 A. The 24 V rating of 6 A is the same as the 400 V figure, so it handles control transformers or PLC outputs at low voltage without derating. The contact reliability spec — acceptability for PLC control at 17 V, 5 mA — means these contacts will switch low-energy signals from a programmable controller without needing gold-plated or bifurcated contacts. That's a real advantage when you're driving inputs directly from a 24 V DC output card. The coil is AC only, with an apparent pick-up power of 27 VA and holding power of 5.4 VA at a power factor of 0.8 and 0.27 respectively. That's a standard SIRIUS S00 coil draw — your control transformer needs to handle the inrush, but the holding VA is low enough that several relays can be held on a small 50 VA supply. That gives you options in a tight cabinet. Operating temperature is -10 to +55 °C, storage from -25 to +70 °C.

Frequently asked questions

What are the key switching ratings for the 3RH7122-1AQ00?

At 400 V AC it's rated 6 A, at 230 V AC also 6 A, at 110 V AC it's 1 A, and at 690 V AC it's 1 A. At 24 V AC it carries 6 A. The contacts are rated for PLC-level signals down to 17 V, 5 mA.

What type of terminals does the 3RH7122-1AQ00 use?

Screw-type terminals for both auxiliary and control circuits. They accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded wire.

Will the 3RH7122-1AQ00 fit in a panel designed for a 3RT7017-1AQ02?

Both are S00 frame size on a 35 mm DIN rail, so the footprint and mounting are identical. The 3RH7122 is a contactor relay with 2NO+2NC auxiliary contacts and no main poles, while the 3RT7017 is a power contactor. Wiring differs — the relay has no power poles to land. Panel cutouts and rail position are the same.

MPN
3RH7122-1AQ00