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Siemens 3RT1325-1BB40 — Contactors

Siemens 3RT1325-1BB40 SIRIUS Power Contactor, 24 VDC, 7.5 kW

MPN3RT1325-1BB40

Siemens SIRIUS power contactor, 3RT1325-1BB40, 24 VDC coil, 4 NO main contacts, screw terminals, size S0, 7.5 kW at AC-2 400 V.

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

3RT1325-1BB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1325-1BB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1325-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1325-1BB40 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts4
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1325-1BB40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 63 A
Short-circuit coordination type 2, fusefuse gL/gG: 25 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1325-1BB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, solid or stranded2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 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 according to DIN EN 50022
Side-by-side mountingYes
3RT1325-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1325-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Installation altitude, max.2 000 m
3RT1325-1BB40 — Mechanical
ParameterValue
Width61 mm
Height85 mm
Depth101 mm

Product details

It carries four normally-open main contacts rated for 7.5 kW at AC-2 duty at 400 V — that's the motor-switching curve for slip-ring or wound-rotor motors, so it handles the higher inrush and arcing of those starts. The magnet coil pulls 24 VDC, and it holds at 5.4 W steady-state, which keeps the heat in the panel manageable when the contactor is sealed in. The enclosure face carries IP20 — safe for a closed panel — while the terminal area is IP00, meaning it expects the panel door to provide the final touch-protection barrier.

Short-circuit coordination and wiring

For Type 2 coordination (no welding after a fault) the spec calls for a 25 A gL/gG fuse upstream. For Type 1 coordination (welding allowed, but no fire or shock) it's 63 A. That's a clean choice for the panel builder: if the machine needs to be back online fast after a short, Type 2 with the 25 A fuse keeps the contactor reusable. Main circuit terminals are screw-type, accepting solid 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²), with a maximum of 2x (0.75–4 mm²) — fine for the motor leads on a 7.5 kW load. Auxiliary and control circuit terminals are also screw-type, same wire range.

Frequently asked questions

What is 3RT1325-1BB40's motor power rating at 400 V?

It is rated for 7.5 kW at AC-2 duty at 400 V, which covers slip-ring motor switching.

What compliance documentation does Siemens provide for 3RT1325-1BB40?

RoHS compliance is documented from July 1, 2006. The part also carries pollution degree 3 rating for industrial environments.

Where can I buy 3RT1325-1BB40 and how is it quoted?

It is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
3RT1325-1BB40