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Siemens 3RU2146-4KD0 — Overload Relays

Siemens 3RU2146-4KD0 SIRIUS Thermal Overload Relay, CLASS 10

MPN3RU2146-4KD0
Active

Siemens SIRIUS thermal overload relay, 3RU2146-4KD0, CLASS 10, S3 size, 690 V rated, screw terminals, contactor-mount.

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

3RU2146-4KD0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S3
Combinable contactor sizesS3
Reference code (IEC 81346-2)F
3RU2146-4KD0 — Protection & Trip
ParameterValue
Overload current setting range57 ... 75 A
Trip classCLASS 10
Overload release typethermal
3RU2146-4KD0 — Electrical (main circuit)
ParameterValue
Rated operational current75 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)1 000 V
Rated value (AC-3e), max.1 000 V
Rated surge withstand voltage8 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)18.9 W
Per pole6.3 W
3RU2146-4KD0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary contacts: CO (changeover)0
Auxiliary switch short-circuit protection (required fuse)fuse gG: 6 A, quick: 10 A
Switching current at 24 V2 A
Switching current at 60 V0.3 A
Switching current at 110 V0.22 A
Switching current at 120 V3 A
Switching current at 125 V0.22 A
Switching current at 220 V0.11 A
Switching current at 230 V2 A
Switching current at 400 V1 A
3RU2146-4KD0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionany
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typespring-loaded terminals
Removable aux./control terminalNo
Conductor cross-section: solid2x (2.5 ... 16 mm²)
Conductor cross-section: solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²)
Conductor range (AWG), main contacts2x (10 ... 1/0), 1x (10 ... 2/0)
Conductor range (AWG), auxiliary contacts2x (20 ... 14)
3RU2146-4KD0 — Environmental
ParameterValue
Operating temperature-40 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating10 ... 95 %
Max. installation altitude2 000 m
3RU2146-4KD0 — Mechanical
ParameterValue
Width70 mm
Height105 mm
Depth125 mm

Product details

Size S3 frame, rated 690 V, with the auxiliary switch built into the housing — no separate add-on block needed for the trip-indication signal.

Mounts directly to the contactor via the fastening method — no DIN rail required, though the 70 mm width and 125 mm depth fit comfortably on a standard DIN-rail panel if the contactor is rail-mounted. Screw-type terminals on the main circuit accept solid 2x (2.5…16 mm²) or stranded up to 1x (10…70 mm²). The auxiliary circuit uses smaller terminals, 2x (0.5…2.5 mm²) solid or stranded. Temperature-compensated from -40 to +60 °C, so it tracks the motor heating curve even in a warm cabinet.

Substance prohibitance date of 03/01/2017 aligns with EU RoHS and REACH compliance scoping — the relay is manufactured to meet those material restrictions. Operating range -40 to +70 °C, storage and transport -55 to +80 °C. Mount in any position; no derating curve to chase for orientation.

Frequently asked questions

What is the trip class and what does it mean for motor protection?

CLASS 10 — the relay opens within 10 seconds at 7.2× the set current. That's the standard class for general-purpose induction motors; fast enough to protect the winding, slow enough to ride through the start transient.

What does the 'for message Tripped' note mean?

The integrated auxiliary switch changes state when the relay trips, providing a dry-contact signal back to the PLC or annunciator — no separate trip-indicator block required.

Where can I buy 3RU2146-4KD0 and get current pricing?

Sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote.

MPN
3RU2146-4KD0