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Siemens 3RU1126-1EB0 — Overload Relays

Siemens 3RU1126-1EB0 SIRIUS Thermal Overload Relay, Class 10

MPN3RU1126-1EB0

Siemens SIRIUS thermal overload relay, order code 3RU1126-1EB0, Size S0, Trip Class 10, screw-type terminals for main and auxiliary circuits, IP20 front protection, 96 mm depth, 45 mm width, 97 mm height.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RU1126-1EB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
3RU1126-1EB0 — Protection & Trip
ParameterValue
Overload current setting range2.8 ... 4 A
Trip classCLASS 10
3RU1126-1EB0 — Electrical (main circuit)
ParameterValue
Poles (main circuit)3
Rated insulation voltage (AC, pollution degree 3)690 V
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)5.7 W
Per pole1.9 W
3RU1126-1EB0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary contacts: CO (changeover)0
Auxiliary switch short-circuit protection (required fuse)fuse gL/gG: 6 A, quick: 10 A
Switching current at 24 V1 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
3RU1126-1EB0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionwith vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back
Auxiliary/control circuit connection typescrew-type terminals
Removable aux./control terminalNo
Conductor cross-section: solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor range (AWG), main contacts2x (16 ... 12), 2x (14 ... 8)
Conductor range (AWG), auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
3RU1126-1EB0 — Environmental
ParameterValue
Operating temperature-20 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating100 %
Max. installation altitude2 000 m
Shock resistance8g / 10 ms
3RU1126-1EB0 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-1EB0 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

The Siemens 3RU1126-1EB0 is a SIRIUS thermal overload relay in Size S0, rated Trip Class 10. It mounts directly to a contactor via screw-type terminals for both the main current circuit (3 poles) and the auxiliary/control circuit. Shock resistance is 8g for 10 ms.

The Size S0 frame mates with S0 contactors in the SIRIUS family; the screw terminals accept solid or finely stranded wire: 2×(0.5…1.5 mm²) and 2×(0.75…2.5 mm²) for both main and auxiliary circuits, with AWG equivalents 2×(16…12) and 2×(14…8) for main, 2×(20…16) and 2×(18…14) for aux. The 100 % relative humidity rating during operation means it can be used in unconditioned enclosures without derating for condensation.

Frequently asked questions

What is the replacement for 3RU1126-1EB0?

Buyers and technicians need to know the exact successor to ensure compatibility and continued operation.

Is 3RU1126-1EB0 obsolete?

Determining obsolescence affects procurement decisions and inventory planning.

Where can I buy 3RU1126-1EB0?

Sourcing the exact part is critical for maintenance and repair of existing systems.

What is the difference between 3RU1126-1EB0 and 3RU2126-1EB0?

Understanding differences helps engineers decide whether to use the successor directly or adapt circuits.

Can I still use 3RU1126-1EB0 after the phased-out notice?

Users need to know if spare parts are still available and if the relay remains reliable in the field.

What is the list price of 3RU1126-1EB0?

Cost estimation for repair or replacement budgets is essential for procurement.

MPN
3RU1126-1EB0