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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 S2. It features a maximum voltage rating of 690V AC, screw terminals, and…

SKU 3G-OTH-40825

Brand
Siemens
Item
Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC
Category
IEC Thermal Overload Relays
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

Siemens
Manufacturer Part Number
3RU21364DB0
Frame Size
S2
Compatible Contactors
Frame Size S2
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

Technical Documents

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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 S2. It features a maximum voltage rating of 690V AC, screw terminals, and integrated bimetallic elements, eliminating the need for separate thermal units. This relay is compatible with SIRIUS contactors of Frame Size S2 and does not include phase loss sensitivity.

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 3RU21364DB0 overload relay used for?

The SIEMENS 3RU21364DB0 is an IEC thermal overload relay that protects motors from overheating due to overcurrent. It is used in industrial automation and machinery applications, compatible with SIRIUS contactors of Frame Size S2, and includes integrated bimetallic elements for direct thermal protection.

What are the specifications of the SIEMENS 3RU21364DB0 overload relay?

The SIEMENS 3RU21364DB0 is a 3-pole thermal overload relay with a 1NO/1NC auxiliary contact form, Frame Size S2, and a maximum voltage rating of 690V AC. It uses screw terminals, has no phase loss sensitivity, and includes integrated bimetallic elements, so no separate thermal units are needed.

Where to buy the SIEMENS 3RU21364DB0 overload relay worldwide?

3G Electric supplies the SIEMENS 3RU21364DB0 overload relay to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on this SIRIUS-compatible thermal overload relay.

How to select the correct SIEMENS overload relay for a SIRIUS contactor?

To select the correct SIEMENS overload relay, match the frame size to your SIRIUS contactor—the 3RU21364DB0 is designed for Frame Size S2. Verify the motor full-load current range and ensure the relay's integrated bimetallic elements cover it. Use screw terminals for secure wiring and confirm the auxiliary contact configuration meets your control circuit needs.

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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Cross-referenced by specification & description
SIEMENS Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Frame Size S3 (MPN 3RU21464MB0)
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SIEMENS Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Frame Size S3 (MPN 3RU21464MB0)
IEC thermal overload relay for motor protection against overload conditions. Rated 14-20 A, 3 poles, with integrated bimetallic elements and screw terminals. Auxiliary contact form 1NO/1NC, maximum voltage 690 V AC. Designed for use with SIRIUS contactors of frame size S2 in industrial motor control applications
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IEC thermal overload relay for motor protection against overload conditions. Rated 14-20 A, 3 poles, with integrated bimetallic elements and screw terminals. Auxiliary contact form 1NO/1NC, maximum voltage 690 V AC. Designed for use with SIRIUS contactors of frame size S2 in industrial motor control applications
IEC thermal overload relay with integrated bimetallic elements for motor protection. Rated 40-50 A, 3 poles, 1NO/1NC auxiliary contacts, screw terminals, 690V AC max. For use with SIRIUS contactors of Frame Size S2. Suitable for industrial motor control applications such as conveyors, pumps, and fans
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IEC thermal overload relay with integrated bimetallic elements for motor protection. Rated 40-50 A, 3 poles, 1NO/1NC auxiliary contacts, screw terminals, 690V AC max. For use with SIRIUS contactors of Frame Size S2. Suitable for industrial motor control applications such as conveyors, pumps, and fans
IEC thermal overload relay for three-phase motor protection. Frame Size S2, rated 54 A to 65 A, with integrated bimetallic elements. Includes 1 normally open and 1 normally closed auxiliary contact. Screw terminal connection, maximum voltage 690 V AC. Compatible with SIRIUS contactors of Frame Size S2
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IEC thermal overload relay for three-phase motor protection. Frame Size S2, rated 54 A to 65 A, with integrated bimetallic elements. Includes 1 normally open and 1 normally closed auxiliary contact. Screw terminal connection, maximum voltage 690 V AC. Compatible with SIRIUS contactors of Frame Size S2
SIEMENS Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Frame Size S2, 36 A – 45 A (MPN 3RU21364GB0)
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SIEMENS Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Frame Size S2, 36 A – 45 A (MPN 3RU21364GB0)
IEC thermal overload relay for motor protection against overcurrent. Frame size S2, 3 poles, rated 70-80 A. Includes integrated bimetallic elements; no separate thermal units required. Auxiliary contacts 1NO/1NC, screw terminals, max voltage 690 V AC. Compatible with SIRIUS contactors of frame size S2
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IEC thermal overload relay for motor protection against overcurrent. Frame size S2, 3 poles, rated 70-80 A. Includes integrated bimetallic elements; no separate thermal units required. Auxiliary contacts 1NO/1NC, screw terminals, max voltage 690 V AC. Compatible with SIRIUS contactors of frame size S2

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