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Siemens 3RB3026-2QB0 — Overload Relays

Siemens 3RB3026-2QB0 Overload Relay, Class 20E, 25 A

MPN3RB3026-2QB0
Active

Siemens SIRIUS solid-state overload relay, 3RB3026-2QB0, Class 20E, 25 A thermal current, for contactor mounting, size S0.

$169.59Ref. price · indicative, final on quote
Siemens 3RB3026-2QB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RB3026-2QB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationsolid-state overload relay
Frame size (overload relay)S0
Combinable contactor sizesS0
Reference code (IEC 81346-2)F
3RB3026-2QB0 — Protection & Trip
ParameterValue
Overload current setting range6 ... 25 A
Trip classCLASS 20E
Overload release typeelectronic
3RB3026-2QB0 — Electrical (main circuit)
ParameterValue
Rated operational current25 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)1.2 W
Per pole0.4 W
3RB3026-2QB0 — 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
3RB3026-2QB0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionany
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typescrew-type terminals
Removable aux./control terminalYes
Conductor cross-section: solid1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²)
Conductor cross-section: solid or stranded1x (0,5 ... 4 mm²), 2x (0,5 ... 2,5 mm²)
Conductor cross-section: finely stranded with ferrule1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)
Conductor range (AWG), auxiliary contacts1x (20 ... 14), 2x (20 ... 14)
3RB3026-2QB0 — 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
3RB3026-2QB0 — Mechanical
ParameterValue
Width45 mm
Height87 mm
Depth84 mm

Product details

Class 20E trip, 25 A thermal current

The Siemens 3RB3026-2QB0 is a SIRIUS solid-state overload relay rated for a thermal current of 25 A, with a trip class of CLASS 20E. This means it allows a motor to draw locked-rotor current for up to 20 seconds before tripping — the right-sized spec for standard industrial motor starts that don't need a fast trip, like pumps and conveyors.

Mounts directly on the contactor

This relay mounts directly onto the contactor via the fastening method specified for contactor mounting, size S0. It snaps onto the contactor without extra DIN-rail space, keeping the panel layout tight. The auxiliary switch is integrated, with signaling contacts rated at 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V. The trip indicator shows a message "tripped" when the relay has operated.

Frequently asked questions

What is the trip class of Siemens 3RB3026-2QB0?

The trip class is CLASS 20E, meaning the relay allows up to 20 seconds of locked-rotor current before tripping. This suits standard motor starts on pumps, fans, and conveyors.

Is the Siemens 3RB3026-2QB0 compatible with Siemens 3RT contactors?

Yes, the relay is designed for contactor mounting (size S0) and fastens directly onto the contactor. It is compatible with the Siemens 3RT series contactors in the same frame size.

Does the Siemens 3RB3026-2QB0 have a trip indicator?

Yes, the relay includes a trip indicator that displays the message "tripped" when the overload relay has operated.

MPN
3RB3026-2QB0