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Siemens Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S2 - IEC Electronic Overload Relays
SiemensIEC Electronic Overload Relays

Siemens Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S2

The SIEMENS Overload Relay: Electronic Protection (MPN 3RB31334UB0) is an IEC electronic overload relay in Frame Size S2, compatible with SIRIUS contactors of the same frame size. It features a 1NO/1NC auxiliary…

SKU 3G-OTH-44951

Brand
Siemens
Item
Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S2
Category
IEC Electronic Overload Relays
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Technical Specifications

Siemens
Manufacturer Part Number
3RB31334UB0
Type
1NO/1NC, Frame Size S2, 12 A – 50 A
Poles
3
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
Not Applicable to Electronic Type Overload Relays
Terminal Connection Type
Screw Terminals
Compatible Contactor Series
SIRIUS
View Full Spec Sheet

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

Product Description

The SIEMENS Overload Relay: Electronic Protection (MPN 3RB31334UB0) is an IEC electronic overload relay in Frame Size S2, compatible with SIRIUS contactors of the same frame size. It features a 1NO/1NC auxiliary contact form, screw terminals, and a maximum voltage rating of 690V AC, with a current range of 12 A to 50 A. This electronic type does not require thermal units and has no phase loss sensitivity.

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 S2 (MPN 3RB31334WB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S2; 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 S2 (MPN 3RB31334WB0). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S2; 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 S00, 3 A – 12 A (MPN 3RB31134SB0). 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: Not Applicable to Electronic Type Overload Relays.
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SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S00, 3 A – 12 A (MPN 3RB31134SB0). 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: Not Applicable to Electronic Type Overload Relays.
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SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S00, 4 A – 16 A (MPN 3RB31134TB0). 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: Not Applicable to Electronic Type Overload Relays.
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SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S0, 10 A – 40 A (MPN 3RB31234VB0). 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, 2 Poles, 1NO/1NC, Frame Size A1, 3 A – 12 A (MPN 3UB88234CW2). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: Class 14 Starters; Terminal Connection Type: Screw Terminals; Frame Size: A1; Maximum Voltage Rating: 690V AC; Thermal Units Required: Not Applicable to Electronic Type Overload Relays; Compatible Contactors: Frame Size A1.
Siemens
SIEMENS Overload Relay: Electronic Protection, 2 Poles, 1NO/1NC, Frame Size A1, 3 A – 12 A (MPN 3UB88234CW2). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: Class 14 Starters; Terminal Connection Type: Screw Terminals; Frame Size: A1; Maximum Voltage Rating: 690V AC; Thermal Units Required: Not Applicable to Electronic Type Overload Relays; Compatible Contactors: Frame Size A1.
SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S6 (MPN 3RB21534FC2). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S6; Maximum Voltage Rating: 1000V AC; Phase Loss Sensitivity: No; Thermal Units Required: Not Applicable to Electronic Type Overload Relays.
Siemens
SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S6 (MPN 3RB21534FC2). Key specifications — Brand: SIEMENS; Auxiliary Contact Form: 1NO/1NC; Compatible Contactor Series: SIRIUS; Terminal Connection Type: Screw Terminals; Frame Size: S6; Maximum Voltage Rating: 1000V 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 S00, 1 A – 4 A (MPN 3RB31134PB0). 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: Not Applicable to Electronic Type Overload Relays.
Siemens
SIEMENS Overload Relay: Electronic Protection, 3 Poles, 1NO/1NC, Frame Size S00, 1 A – 4 A (MPN 3RB31134PB0). 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: Not Applicable to Electronic Type Overload Relays.