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Siemens 3UB81334HW2 IEC Electronic Overload Relay - IEC Electronic Overload Relays
SiemensIEC Electronic Overload Relays

Siemens 3UB81334HW2 IEC Electronic Overload Relay

The SIEMENS Overload Relay is an IEC electronic overload relay with 3 poles and a 1NO/1NC auxiliary contact form. Designed for Frame Size B, it features a maximum voltage rating of 690V AC and screw terminals. This…

SKU 3G-OTH-45161

Brand
Siemens
Item
3UB81334HW2 IEC Electronic Overload Relay
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
3UB81334HW2
Frame Size
B
Compatible Contactors
Frame Size B
Auxiliary Contact Form
1NO/1NC
Maximum Voltage Rating
690V AC
Thermal Units Required
Not Applicable to Electronic Type Overload Relays
Terminal Connection Type
Screw Terminals
Compatible Contactor Series
Class 48 Overload Relays

Technical Documents

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

Product Description

The SIEMENS Overload Relay is an IEC electronic overload relay with 3 poles and a 1NO/1NC auxiliary contact form. Designed for Frame Size B, it features a maximum voltage rating of 690V AC and screw terminals. This electronic type does not require thermal units and is compatible with Class 48 Overload Relays and Frame B contactors.

Frequently Asked Questions

What is the SIEMENS 3UB81334HW2 overload relay used for?

The SIEMENS 3UB81334HW2 is an IEC electronic overload relay used to protect motors from overcurrent and phase loss. It is designed for Frame Size B contactors and is commonly applied in industrial motor control panels, conveyors, pumps, and HVAC systems where reliable electronic protection is required.

What are the specifications of the SIEMENS 3UB81334HW2 overload relay?

The SIEMENS 3UB81334HW2 is a 3-pole electronic overload relay with a 1NO/1NC auxiliary contact form. It has a maximum voltage rating of 690V AC, uses screw terminals, and is compatible with Frame Size B contactors and Class 48 Overload Relays. No thermal units are required for this electronic type.

Where to buy the SIEMENS 3UB81334HW2 overload relay worldwide?

You can source the SIEMENS 3UB81334HW2 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 supply genuine Siemens components for industrial applications.

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

To select the correct SIEMENS overload relay, match the frame size to your contactor (Frame Size B for the 3UB81334HW2), verify the motor full-load current range, and ensure the auxiliary contact configuration (1NO/1NC) suits your control circuit. Electronic types like this one do not require thermal units and offer adjustable protection settings.

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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Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
IEC electronic overload relay for motor protection against overcurrent and phase loss. Three-pole design with screw terminals, auxiliary contact form 1NO/1NC, and maximum voltage rating of 690V AC. Compatible with Frame Size B contactors and Class 14 starters. No thermal units required
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IEC electronic overload relay for motor protection against overcurrent and phase loss. Three-pole unit with screw terminals, frame size A1, current range 10 A to 40 A, and maximum voltage 690V AC. Auxiliary contact form 1NO/1NC. No thermal units required. Compatible with Class 14 starters and contactors of frame size A1
IEC electronic overload relay with 3 poles, 1 normally open and 1 normally closed auxiliary contact. Rated for 690V AC, with screw terminals. Designed for use with Frame Size A1 contactors and Class 48 overload relays. No thermal units required
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IEC electronic overload relay with 3 poles, 1 normally open and 1 normally closed auxiliary contact. Rated for 690V AC, with screw terminals. Designed for use with Frame Size A1 contactors and Class 48 overload relays. No thermal units required
IEC electronic overload relay with three poles, frame size A, and adjustable current range of 0.75 A to 3.4 A. Features one normally open and one normally closed auxiliary contact, screw terminals, and a maximum voltage rating of 690V AC. Used for motor overload and phase loss protection in industrial control applications
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IEC electronic overload relay for motor protection against overcurrent and phase loss. Two-pole design with 1 normally open and 1 normally closed auxiliary contact. Rated for 690V AC, with screw terminals. Compatible with Frame Size A contactors and Class 48 overload relays. Thermal units not required
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IEC electronic overload relay for motor protection, 3 poles, adjustable current range 0.32 A to 1.25 A. Frame size S00 with screw terminals, auxiliary contacts 1NO/1NC, rated up to 690 V AC. No thermal units required; compatible with SIRIUS contactors of frame size S00
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