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Siemens 3RB2035-1UB0 — Overload Relays

Siemens 3RB2035-1UB0 SIRIUS Solid-State Overload Relay, CLAS

MPN3RB2035-1UB0

Siemens SIRIUS solid-state overload relay, 3RB2035-1UB0, CLASS 10E, contactor mounting, screw terminals, 690 V AC-3 max, ATEX Ex II (2) GD.

$179.48Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RB2035-1UB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationsolid-state overload relay
Combinable contactor sizesS2
3RB2035-1UB0 — Protection & Trip
ParameterValue
Trip classCLASS 10E
3RB2035-1UB0 — Electrical (main circuit)
ParameterValue
Poles (main circuit)3
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
3RB2035-1UB0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary switch short-circuit protection (required fuse)fuse gL/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
3RB2035-1UB0 — Connection & Mounting
ParameterValue
Mounting positionany
Conductor cross-section: solid0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)
3RB2035-1UB0 — Environmental
ParameterValue
Operating temperature-25 ... +60 °C
Storage temperature-40 ... +80 °C
Transport temperature-40 ... +80 °C
Relative humidity, operating100 %
Shock resistance15g / 11 ms
3RB2035-1UB0 — Mechanical
ParameterValue
Width55 mm
Height92 mm
Depth109 mm
3RB2035-1UB0 — Specifications
ParameterValue
Type Of ProtectionPTB 06 ATEX 3001 Ex II (2) GD

Product details

The Siemens SIRIUS 3RB2035-1UB0 is a solid-state overload relay, CLASS 10E, designed for contactor mounting. The CLASS 10E trip class means it will disconnect a locked-rotor motor within 10 seconds at cold start, which is the standard for most general-purpose pump and fan applications.

The screw-type terminals accept solid conductors from 0.5 to 4 mm² (or 2x 0.5 to 2.5 mm²) and stranded up to 35 mm² — enough for the motor circuit of a 15 kW drive. The IP00 front protection means it lives inside a closed panel, not exposed to washdown. The 15g / 11 ms shock resistance confirms it can ride out a contactor slam or a nearby breaker trip without nuisance failure.

Frequently asked questions

What are the key dimensions for panel fit?

Width is 55 mm, height 92 mm, depth 109 mm. It is designed for contactor mounting, so it clips directly onto the same DIN rail as the matching SIRIUS contactor without extra wiring.

What wire sizes does the screw terminal accept?

Solid conductors: 0.5 to 4 mm² (or 2x 0.5 to 2.5 mm²). Stranded: 1 to 35 mm² (or 2x up to 25 mm²). AWG equivalents: 2 x max 4 AWG, 1 x 18 to 2 AWG for the main contacts.

What compliance documentation is available?

The relay carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD. It meets IEC 61000-4-4 burst immunity severity level 3 and has a 6 kV surge voltage resistance rating. Reference code per DIN EN 81346-2 is F.

MPN
3RB2035-1UB0