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Siemens 3RU1126-4BB0-ZW98 — Overload Relays

Siemens 3RU1126-4BB0-ZW98 SIRIUS Thermal Overload Relay, Cla

MPN3RU1126-4BB0-ZW98

Siemens SIRIUS thermal overload relay, 3RU1126-4BB0-ZW98, S0 frame, Class 10, 3-pole, screw terminals, IP20 front, ATEX approved.

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

Specifications

3RU1126-4BB0-ZW98 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
Reference code (IEC 81346-2)F
3RU1126-4BB0-ZW98 — Protection & Trip
ParameterValue
Overload current setting range14 ... 20 A
Trip classCLASS 10
3RU1126-4BB0-ZW98 — 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)8.1 W
Per pole2.7 W
3RU1126-4BB0-ZW98 — 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
3RU1126-4BB0-ZW98 — 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)
3RU1126-4BB0-ZW98 — 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
3RU1126-4BB0-ZW98 — Mechanical
ParameterValue
Width45 mm
Height97 mm
Depth96 mm
3RU1126-4BB0-ZW98 — Specifications
ParameterValue
Type Of ProtectionDMT 98 ATEX G 001

Product details

It is a 3-pole device with screw-type terminals for both main and auxiliary circuits, and carries a Class 10 trip characteristic — meaning it will trip within 10 seconds at 7.2× the set current, matching the thermal time constant of standard induction motors during a locked-rotor event.

Mounts directly onto a contactor via the fastening method (contactor mounting), with a vertical mounting surface that allows ±135° rotation and ±45° tilt front-to-back. The S0 footprint (45 mm wide, 97 mm high, 96 mm deep) fits standard DIN-rail enclosures without crowding adjacent devices.

Wiring and terminal capacity

Main circuit terminals accept 2× (0.5…1.5 mm²) solid or 2× (0.75…2.5 mm²) solid, with AWG equivalents 2× (16…12) and 2× (14…8). Auxiliary/control circuit terminals accept 2× (20…16) and 2× (18…14) AWG. Finely stranded wire with core-end processing is also supported. Power dissipation per pole is 2.7 W.

Auxiliary contact ratings vary by voltage: 1 A at 24 V, 0.22 A at 110 V, 3 A at 120 V, 0.22 A at 125 V, 0.11 A at 220 V, 2 A at 230 V, and 1 A at 400 V. These cover typical control-circuit voltages in both North American and IEC panels.

Shock and compliance

Shock resistance is 8g for 10 ms. Substance prohibitance date is 07/01/2006 (RoHS compliance).

Frequently asked questions

Where can I buy 3RU1126-4BB0-ZW98 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is 3RU1126-4BB0-ZW98's listed depth?

The depth is 96 mm.

What compliance documentation does this brand provide for 3RU1126-4BB0-ZW98?

The relay carries ATEX approval (DMT 98 ATEX G 001), RoHS compliance (substance prohibitance date 07/01/2006), and IP20 front protection. Surge voltage resistance is 6 kV.

MPN
3RU1126-4BB0-ZW98