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Siemens Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC - IEC Thermal Overload Relays
SiemensIEC Thermal Overload Relays

Siemens Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC

The SIEMENS Overload Relay is an IEC thermal overload relay with three poles and a 1NO/1NC auxiliary contact form, designed for Frame Size S3. It features integrated bimetallic elements, eliminating the need for…

SKU 3G-OTH-42465

Brand
Siemens
Item
Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC
Category
IEC Thermal Overload Relays
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Technical Specifications

Siemens
Manufacturer Part Number
3RU21464MB0
Frame Size
S3
Compatible Contactors
Frame Size S3
Auxiliary Contact Form
1NO/1NC
Maximum Voltage Rating
690V AC
Phase Loss Sensitivity
No
Thermal Units Required
None (Relay Includes Integrated Bimetallic Elements)
Terminal Connection Type
Screw Terminals
Compatible Contactor Series
SIRIUS
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS Overload Relay is an IEC thermal overload relay with three poles and a 1NO/1NC auxiliary contact form, designed for Frame Size S3. It features integrated bimetallic elements, eliminating the need for separate thermal units, and has a maximum voltage rating of 690V AC. This relay is compatible with SIRIUS contactors of Frame Size S3 and uses screw terminals for connection.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the SIEMENS 3RU21464MB0 overload relay used for?

The SIEMENS 3RU21464MB0 is an IEC thermal overload relay used to protect motors from overcurrent and phase imbalance. It is designed for industrial applications requiring reliable thermal protection, compatible with SIRIUS contactors of Frame Size S3, and features integrated bimetallic elements for direct overload sensing.

What are the specifications of the SIEMENS 3RU21464MB0 overload relay?

The SIEMENS 3RU21464MB0 is a 3-pole thermal overload relay with a 1NO/1NC auxiliary contact form, Frame Size S3, and a maximum voltage rating of 690V AC. It uses screw terminals, has no phase loss sensitivity, and includes integrated bimetallic elements, eliminating the need for separate thermal units. It is compatible with SIRIUS contactors of Frame Size S3.

Where to buy the SIEMENS 3RU21464MB0 overload relay worldwide?

You can source the SIEMENS 3RU21464MB0 overload relay from 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we provide reliable sourcing for this Siemens SIRIUS series component.

How to install the SIEMENS 3RU21464MB0 overload relay?

To install the SIEMENS 3RU21464MB0, first ensure the contactor is de-energized. Mount the relay directly onto a SIRIUS contactor of Frame Size S3 using the provided screw terminals. Wire the main circuit through the relay's three poles and connect the 1NO/1NC auxiliary contacts to your control circuit. Follow standard IEC installation practices and verify settings per motor full-load current.

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 thermal 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: Thermal Protection, 3 Poles, 1NO/1NC, Frame Size S00, 0.35 A – 0.5 A (MPN 3RU21160FB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S00; Maximum Voltage Rating: 690V AC; Phase Loss Sensitivity: No; Thermal Units Required: None (Relay Includes Integrated Bimetallic Elements).
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SIEMENS Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Frame Size S00, 0.35 A – 0.5 A (MPN 3RU21160FB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S00; Maximum Voltage Rating: 690V AC; Phase Loss Sensitivity: No; Thermal Units Required: None (Relay Includes Integrated Bimetallic Elements).