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Siemens 3RH1244-2BB40 — Contactors

Siemens SIRIUS 3RH1244-2BB40 Auxiliary Contactor, 24 VDC, 4

MPN3RH1244-2BB40

Siemens SIRIUS auxiliary contactor, 3RH1244-2BB40, 24 VDC coil, 4 NO instantaneous contacts, 10 A AC-12 rated, S00 frame size, screw and snap-on mounting.

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

3RH1244-2BB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1244-2BB40 — Ratings & Performance
ParameterValue
Rated value @ 24 V10 A
Rated value @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1244-2BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1244-2BB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1244-2BB40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1244-2BB40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
3RH1244-2BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
3RH1244-2BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1244-2BB40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth114 mm

Product details

SIRIUS 3RH1244-2BB40 — 24 VDC Auxiliary Contactor, 4 NO, S00 Frame

It carries 4 normally open instantaneous contacts rated at 10 A for AC-12 duty, which covers resistive and general-purpose loads at line voltage. The S00 frame size keeps the footprint compact at 45 mm wide, 60 mm tall, and 114 mm deep — a standard fit for SIRIUS modular systems on DIN rail or screw-mounted surfaces. The contactor is rated for 10 million mechanical operations typical, with a contact reliability of 1 faulty switching per 100 million at 17 V, 1 mA — a strong signal-level performance for PLC inputs or safety relay chains.

Mounting is via screw or snap-on onto DIN rail. Terminal capacity accepts 2x (0.25 to 2.5 mm²) solid or 2x (0.25 to 1.5 mm²) finely stranded with ferrule — standard for control wiring up to 14 AWG.

Shock resistance is rated at 10g for 5 ms and 5g for 10 ms — sufficient for most industrial vibration environments.

Frequently asked questions

How do I get current pricing and availability for 3RH1244-2BB40?

Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through independent distribution channels.

What is the closest functional second-source to 3RH1244-2BB40?

The 3RT1016-1BB42 is a contactor with a similar S00 frame and 24 VDC coil, but it is a power contactor with main contacts, not an auxiliary contactor. The 3RH1244-2BB40 is the dedicated auxiliary contactor variant with 4 NO auxiliary contacts. They share the same mounting footprint and coil voltage, so a panel designed for the 3RT1016-1BB42 can accept the 3RH1244-2BB40 without rewiring, provided the auxiliary contact count meets the circuit requirements.

What is 3RH1244-2BB40's listed depth?

The depth is 114 mm.

What is 3RH1244-2BB40's listed solid wire capacity?

Solid wire capacity is 2x (0.25 to 2.5 mm²).

Will 3RH1244-2BB40 drop into a panel specified around 3RT1016-1BB42 without rewiring?

Yes, both parts share the S00 frame size, same 45 mm width, and same screw/snap-on mounting. The coil voltage is identical at 24 VDC. The 3RH1244-2BB40 provides 4 NO auxiliary contacts, while the 3RT1016-1BB42 is a power contactor with main contacts. If the circuit only needs auxiliary contacts, the 3RH1244-2BB40 is a direct mechanical and electrical fit.

What compliance documentation does Siemens provide for 3RH1244-2BB40?

Siemens SIRIUS components typically carry CE, UL, CSA, and CCC certifications, with RoHS and REACH compliance declarations available through the manufacturer's documentation portal. Specific certification markings should be verified against the nameplate on the unit received.

MPN
3RH1244-2BB40