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Siemens 3RB3133-4UD0 — Overload Relays

Siemens 3RB3133-4UD0 SIRIUS solid-state overload relay, 50 A

MPN3RB3133-4UD0
Active

Siemens SIRIUS solid-state overload relay, 3RB3133-4UD0, size S2, 50 A thermal current, adjustable trip class 5E/10E/20E/30E, screw terminals, contactor 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

3RB3133-4UD0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationsolid-state overload relay
Frame size (overload relay)S2
Combinable contactor sizesS2
Reference code (IEC 81346-2)F
3RB3133-4UD0 — Protection & Trip
ParameterValue
Overload current setting range12.5 ... 50 A
Trip classCLASS 5E, 10E, 20E and 30E adjustable
Overload release typeelectronic
3RB3133-4UD0 — Electrical (main circuit)
ParameterValue
Rated operational current50 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)690 V
Rated value (AC-3e), max.690 V
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)1.8 W
Per pole0.6 W
3RB3133-4UD0 — 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
Switching current at 24 V2 A
Switching current at 60 V0.55 A
Switching current at 110 V0.3 A
Switching current at 120 V4 A
Switching current at 125 V0.3 A
Switching current at 220 V0.11 A
Switching current at 230 V3 A
3RB3133-4UD0 — 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 terminalYes
Conductor cross-section: solid2x (0.25 ... 1.5 mm²)
Conductor cross-section: solid or stranded2x (0,25 ... 1,5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.25 ... 1.5 mm²)
3RB3133-4UD0 — Environmental
ParameterValue
Operating temperature-25 ... +60 °C
Storage temperature-40 ... +80 °C
Transport temperature-40 ... +80 °C
Relative humidity, operating10 ... 95 %
Max. installation altitude2 000 m
Shock resistance15g / 11 ms
3RB3133-4UD0 — Mechanical
ParameterValue
Width55 mm
Height99 mm
Depth104 mm

Product details

The Siemens 3RB3133-4UD0 is a SIRIUS solid-state overload relay, size S2, rated for a thermal current of 50 A at 690 V (AC-3e). The trip class is field-adjustable among CLASS 5E, 10E, 20E, and 30E, letting you match the thermal memory to the motor's starting profile — a 5E setting trips quickly on a light-load start, while 30E handles high-inertia loads like fans or crushers without nuisance tripping.

The relay accepts solid or stranded conductors up to 2x (0.25–1.5 mm²) on the control circuit and 2x (10–35 mm²) or 1x 50 mm² on the main circuit, with screw terminals sized for a Pozidriv PZ 2 bit and a 5–6 mm shaft diameter. It fits any mounting position and withstands shock up to 15g / 11 ms and vibration per IEC 60068-2-27. The signaling contact (97/98) in the tripped position drops to 8g / 11 ms — still robust for panel environment.

Frequently asked questions

How do I get current pricing and availability for 3RB3133-4UD0?

Submit an RFQ through the storefront. The part is sourced to order against an RFQ; availability and current pricing are confirmed at quote time.

What is the note 'for message tripped' on the 3RB3133-4UD0?

The note indicates that the signaling contact (97/98) is rated for the tripped position, with a reduced shock rating of 8g / 11 ms in that state.

Will 3RB3133-4UD0 drop into a panel specified around 3RT1044-1FB46 without rewiring?

The 3RB3133-4UD0 mounts directly onto a contactor and uses screw-type terminals for the main circuit. The 3RT1044-1FB46 is a contactor, not an overload relay; they are complementary parts, not direct substitutes. Mechanical compatibility depends on the contactor frame size and terminal layout — verify the contactor's mounting interface before specifying.

MPN
3RB3133-4UD0