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Siemens Overload Relay: Electronic Protection, 2 Poles, 1NO/1NC - IEC Electronic Overload Relays
SiemensIEC Electronic Overload Relays

Siemens Overload Relay: Electronic Protection, 2 Poles, 1NO/1NC

The SIEMENS Overload Relay is an IEC electronic overload relay with 2 poles and a 1NO/1NC auxiliary contact form. It features a Frame Size A, a maximum voltage rating of 690V AC, and screw terminals. This relay is…

SKU 3G-OTH-45198

Brand
Siemens
Item
Overload Relay: Electronic Protection, 2 Poles, 1NO/1NC
Category
IEC Electronic Overload Relays
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Technical Specifications

Siemens
Manufacturer Part Number
3UB88134BB2
Frame Size
A
Compatible Contactors
Frame Size A
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 2 poles and a 1NO/1NC auxiliary contact form. It features a Frame Size A, a maximum voltage rating of 690V AC, and screw terminals. This relay is compatible with Frame Size A contactors and Class 48 Overload Relays, and thermal units are not applicable to this electronic type.

Frequently Asked Questions

What is the SIEMENS 3UB88134BB2 overload relay used for?

The SIEMENS 3UB88134BB2 is an IEC electronic overload relay used to protect motors from overcurrent and phase loss in industrial automation and HVAC systems. It integrates with Frame Size A contactors and Class 48 overload relays, providing reliable protection via its 1NO/1NC auxiliary contacts.

What are the specifications of the SIEMENS 3UB88134BB2 overload relay?

The SIEMENS 3UB88134BB2 is a 2-pole electronic overload relay with Frame Size A, a maximum voltage rating of 690V AC, and screw terminals. It features a 1NO/1NC auxiliary contact form and is compatible with Frame Size A contactors and Class 48 overload relays. Thermal units are not required.

Where to buy the SIEMENS 3UB88134BB2 overload relay worldwide?

3G Electric supplies the SIEMENS 3UB88134BB2 overload relay worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this electronic protection relay.

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

To select the correct SIEMENS overload relay, match the frame size (e.g., Frame Size A) to your contactor and verify the motor's full-load current and voltage (up to 690V AC). For electronic types like the 3UB88134BB2, thermal units are not needed. Consult the motor nameplate and contactor compatibility.

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, 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.
SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0 (MPN 3RB31234NB0). 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 (MPN 3RB31234NB0). 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.