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

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

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
Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC
Category
IEC Electronic Overload Relays
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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
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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.

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 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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SIEMENS Overload Relay: Electronic Protection, 2 Poles, 1NO/1NC, Frame Size A, 0.25 A – 1 A (MPN 3UB88134AB2). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: Class 48 Overload Relays; Terminal Connection Type: Screw Terminals; Frame Size: A; Maximum Voltage Rating: 690V AC; Thermal Units Required: Not Applicable to Electronic Type Overload Relays; Compatible Contactors: Frame Size A.
SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0, 6 A – 25 A (MPN 3RB31234QB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S0; Maximum Voltage Rating: 690V AC; Phase Loss Sensitivity: No; Thermal Units Required: Not Applicable to Electronic Type Overload Relays.
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SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0, 6 A – 25 A (MPN 3RB31234QB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S0; Maximum Voltage Rating: 690V AC; Phase Loss Sensitivity: No; Thermal Units Required: Not Applicable to Electronic Type Overload Relays.