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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-44590

Brand
Siemens
Item
Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0
Category
IEC Electronic Overload Relays
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Siemens
Manufacturer Part Number
3RB31234SB0
Type
1NO/1NC, Frame Size S0, 3 A – 12 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

Technical Documents

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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 3 A to 12 A and does not include phase loss sensitivity or thermal units.

Frequently Asked Questions

What is the SIEMENS 3RB31234SB0 overload relay used for?

The SIEMENS 3RB31234SB0 is an IEC electronic overload relay used to protect motors from overload and phase imbalance. It is designed for industrial applications with SIRIUS contactors of frame size S0, providing reliable protection for equipment operating up to 690V AC.

What are the specifications of the SIEMENS 3RB31234SB0 overload relay?

The SIEMENS 3RB31234SB0 is a 3-pole electronic overload relay with a current range of 3 A to 12 A, frame size S0, and screw terminals. It has a 1NO/1NC auxiliary contact form, maximum voltage rating of 690V AC, and does not include phase loss sensitivity or thermal units.

Where to buy the SIEMENS 3RB31234SB0 overload relay worldwide?

You can source the SIEMENS 3RB31234SB0 overload relay worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location, ensuring a seamless procurement process for this SIRIUS-compatible relay.

How to select the correct SIEMENS overload relay for a motor?

To select the correct SIEMENS overload relay, match the relay's current range (e.g., 3 A to 12 A for the 3RB31234SB0) to the motor's full-load current. Ensure the frame size (S0) is compatible with your SIRIUS contactor. For electronic types, thermal units are not required, simplifying setup.

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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