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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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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
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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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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).