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Siemens Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0 - IEC Electronic Overload Relays
SiemensIEC Electronic Overload Relays

Siemens Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0

The SIEMENS Overload Relay: Electronic Protection is an IEC electronic overload relay with a frame size S0, designed for use with SIRIUS contactors of the same frame size. It features a 1NO/1NC auxiliary contact…

SKU 3G-OTH-44785

Brand
Siemens
Item
Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0
Category
IEC Electronic Overload Relays
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Technical Specifications

Siemens
Manufacturer Part Number
3RB31234QB0
Type
1NO/1NC, Frame Size S0, 6 A – 25 A
Poles
3
Frame Size
S0
Compatible Contactors
Frame Size S0
Auxiliary Contact Form
1NO/1NC
Maximum Voltage Rating
690V AC
Phase Loss Sensitivity
No
Thermal Units Required
Not Applicable to Electronic Type Overload Relays
Terminal Connection Type
Screw Terminals
Compatible Contactor Series
SIRIUS
View Full Spec Sheet

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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS Overload Relay: Electronic Protection is an IEC electronic overload relay with a frame size S0, designed for use with SIRIUS contactors of the same frame size. It features a 1NO/1NC auxiliary contact form, screw terminals, and a maximum voltage rating of 690V AC. This 3-pole relay covers a current range of 6 A to 25 A and does not include phase loss sensitivity or require thermal units.

Frequently Asked Questions

What is the SIEMENS 3RB31234QB0 overload relay used for?

The SIEMENS 3RB31234QB0 is an IEC electronic overload relay used to protect motors from overcurrent conditions. It is designed for use with SIRIUS contactors of frame size S0 in industrial automation and control panels, providing reliable electronic protection for three-phase motors.

What are the specifications of the SIEMENS 3RB31234QB0 overload relay?

The SIEMENS 3RB31234QB0 is a 3-pole electronic overload relay with frame size S0, current range 6 A to 25 A, auxiliary contact form 1NO/1NC, screw terminals, and maximum voltage rating 690V AC. It is compatible with SIRIUS contactors of frame size S0 and does not require thermal units.

Where to buy the SIEMENS 3RB31234QB0 overload relay worldwide?

You can source the SIEMENS 3RB31234QB0 overload relay worldwide through 3G Electric. As a global industrial equipment distributor, 3G Electric handles full logistics, customs clearance, and delivery to your location. Contact 3G Electric for availability and lead time.

How to install the SIEMENS 3RB31234QB0 overload relay?

To install the SIEMENS 3RB31234QB0, mount it directly onto a SIRIUS contactor of frame size S0 using the screw terminals. Ensure the motor current is within the 6 A to 25 A range. Follow standard IEC wiring practices and verify the auxiliary contacts (1NO/1NC) are correctly connected.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens iec electronic overload relays. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0 (MPN 3RB31234NB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S0; Maximum Voltage Rating: 690V AC; Phase Loss Sensitivity: No; Thermal Units Required: Not Applicable to Electronic Type Overload Relays.