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Siemens 3RB3036-2UX1 — Overload Relays

Siemens 3RB3036-2UX1 SIRIUS Solid-State Overload Relay, Trip

MPN3RB3036-2UX1
Active

Siemens SIRIUS solid-state overload relay, 3RB3036-2UX1, Trip Class 20E, 50 A thermal current, 690 V rated value, Size S2.

Siemens 3RB3036-2UX1 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RB3036-2UX1 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationsolid-state overload relay
Frame size (overload relay)S2
Combinable contactor sizesS2
Reference code (IEC 81346-2)F
3RB3036-2UX1 — Protection & Trip
ParameterValue
Overload current setting range12.5 ... 50 A
Trip classCLASS 20E
Overload release typeelectronic
3RB3036-2UX1 — 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 circuitstraight-through transformers
Power loss at rated current (hot)0.1 W
Per pole0.03 W
3RB3036-2UX1 — 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
3RB3036-2UX1 — Connection & Mounting
ParameterValue
Mounting / fastening methodstand-alone installation
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)
Conductor range (AWG), auxiliary contacts1x (24 ... 16), 2x (24 ... 16)
3RB3036-2UX1 — 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
3RB3036-2UX1 — Mechanical
ParameterValue
Width55 mm
Height81 mm
Depth109 mm

Product details

The Siemens 3RB3036-2UX1 is a SIRIUS solid-state overload relay in Size S2, rated for 50 A thermal current at up to 690 V. Its electronic overload release uses straight-through transformers for the main current circuit, with Trip Class 20E — meaning it allows a 20-second thermal overload before tripping, sized for standard motor start profiles on pumps, fans, and conveyors without nuisance trips during acceleration. The auxiliary switch is integrated, and the relay signals a "tripped" message via the 97/98 contact. Switching capacity varies by voltage: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.3 A at 125 V — enough to drive a PLC input or indicator lamp directly.

Compliance documentation includes RoHS substance prohibition dated October 15, 2014, and the relay is designed to IEC standards for vibration (1–6 Hz, 15 mm; 6–500 Hz, 20 m/s²) and shock (15g / 11 ms per IEC 60068-2-27).

The screw terminals accept 2x (0.25–1.5 mm²) solid or stranded wire, terminated with a Pozidriv PZ2 driver (shaft diameter 5–6 mm).

Frequently asked questions

What is the closest functional second-source for the 3RB3036-2UX1?

The 3RU2116-1FC1 is a thermal bimetallic overload relay in the same SIRIUS Size S2 family. It shares the same mounting footprint and terminal layout, so it can drop into the same panel without rewiring. The key difference is release technology: the 3RB3036-2UX1 uses an electronic overload with Trip Class 20E, while the 3RU2116-1FC1 uses a bimetallic thermal element.

What is the depth of the 3RB3036-2UX1?

The depth is 109 mm, with a width of 55 mm and height of 81 mm. These dimensions fit standard panel layouts and the Size S2 mounting pattern.

What compliance documentation does Siemens provide for the 3RB3036-2UX1?

The relay complies with RoHS (substance prohibition dated October 15, 2014) and is designed to IEC 60068-2-27 for shock resistance. It operates within IEC standard vibration profiles and temperature ranges. Full compliance documentation is available from the manufacturer.

MPN
3RB3036-2UX1