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Siemens 3RH1371-2FB40 — Contactors

Siemens 3RH1371-2FB40 SIRIUS Auxiliary Contactor, 24 V DC, 7

MPN3RH1371-2FB40

Siemens SIRIUS auxiliary contactor, size S00, 24 V DC coil with integrated diode, 7 NO instantaneous contacts, 10 A AC-12 rated, screw and snap-on DIN rail mount, IP20 front.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1371-2FB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1371-2FB40 — Ratings & Performance
ParameterValue
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1371-2FB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1371-2FB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1371-2FB40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1371-2FB40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
3RH1371-2FB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RH1371-2FB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1371-2FB40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth114 mm

Product details

It carries 7 instantaneous normally-open (NO) contacts, each rated 10 A in AC-12 duty (resistive load at 400 V max), and is intended for signaling, interlocking, or extending the contact count on a main contactor or PLC output. The coil is 24 V DC with a built-in diode surge suppressor, so no external flyback diode is needed on the panel wiring.

The 45 mm width and 60 mm height match the S00 footprint — same as a 3RT1 contactor of that frame size. Depth is 114 mm including terminals. Clearance at the side is 0 mm, so units can be ganged without spacing. Terminal solid capacity is 2x 0.25 to 2.5 mm² per clamp.

The 10 A AC-12 rating is the maximum continuous current per contact for resistive loads at up to 400 V. For inductive or DC switching, derate per the listed values: 6 A at 230 V AC, 3 A at 400 V AC, 1 A at 690 V AC, and 10 A at 24 V DC, 1 A at 110 V DC, 0.27 A at 220 V DC. Coil holding power is a constant 3.2 W DC — no inrush spike to budget for. Shock resistance is 10g for 5 ms and 5g for 10 ms — sufficient for most machine-mounted panels.

Frequently asked questions

Where can I buy the 3RH1371-2FB40 and get a price?

This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time.

What are the key ratings of the 3RH1371-2FB40?

It has 7 NO instantaneous contacts rated 10 A AC-12, a 24 V DC coil with integrated diode suppression, and mounts on DIN rail in a 45 mm wide S00 footprint.

Will the 3RH1371-2FB40 drop into a panel built for a 3RT1015-1BB42?

Yes — both are SIRIUS S00 size, same 45 mm width and DIN rail mount. The 3RH1371-2FB40 is an auxiliary contactor (7 NO, no main power contacts), while the 3RT1015-1BB42 is a power contactor with a coil and main poles. They share the same footprint and terminal spacing, so no rewiring of the DIN rail or busbar is needed for the auxiliary contactor itself.

What is the depth of the 3RH1371-2FB40?

114 mm, including terminals.

What wire size does the 3RH1371-2FB40 accept?

Solid wire 2x 0.25 to 2.5 mm² per terminal.

MPN
3RH1371-2FB40