siemens
Siemens 3RU2126-1GB0 SIRIUS Thermal Overload Relay 4.5 - 6.3 A, Class 10
Model: 3RU2126-1GB0
4-hour response · Pricing in SAR · Delivery across all KSA regions
Siemens 3RU2126-1GB0 SIRIUS Thermal Overload Relay 4.5 - 6.3 A, Class 10
The Siemens 3RU2126-1GB0 is a SIRIUS 3-phase thermal overload relay from the 3RU2126 series, frame size S0, with a setting range of 4.5 - 6.3 A and trip class 10. It plugs directly onto Siemens 3RT2023-2028 contactors to form a compact motor starter and is stocked in Saudi Arabia by Razz Middle East for motor protection across the Kingdom's process industries.
Technical Overview
Built to IEC 60947-4-1, the 3RU2126-1GB0 uses temperature-compensated bimetal strips to model motor heating and trip on sustained overload. It provides phase-loss sensitivity and differential (single-phasing) detection, with a test function and selectable manual or automatic reset. The relay mounts directly beneath its companion contactor, eliminating inter-device wiring and producing a self-contained starter that fits standard S0 mounting in any motor control centre.
Performance & Specifications
The adjustable setting range of 4.5 - 6.3 A lets a single device cover a band of motor full-load currents, reducing the number of stocked variants. Trip class 10 matches normal-starting motors, the relay carries an integrated NO + NC auxiliary contact for signalling and control, and it operates reliably from -25 °C to +60 °C in Gulf ambient conditions.
Applications in Saudi Arabia
The 3RU2126-1GB0 protects motors against thermal overload and single-phasing on pump, fan, conveyor and compressor drives throughout Saudi Arabia. It is widely specified in NWC and SWCC water stations, SABIC and Sadara petrochemical MCCs in Jubail, MAADEN mining drives, and ARAMCO utility systems, where its phase-loss sensitivity prevents the costly winding burnouts that follow a lost phase on the Kingdom's long distribution feeders.
Installation & Integration
The 3RU2126-1GB0 is designed for direct mounting beneath its companion SIRIUS contactor, with the option of a stand-alone mounting bracket for separate panel installation. Its terminals align with the contactor's output, eliminating loose inter-device wiring and reducing the number of connections that must be inspected during commissioning. A clearly marked setting dial, RESET and TEST buttons and a STOP function sit on the accessible front face, and the integrated NO + NC auxiliary contact wires straight into the control circuit for trip signalling. This direct-mount approach lets panel builders in Riyadh and Dammam assemble compact, repeatable starter buckets quickly and consistently.
Standards, Quality & Compliance
Every 3RU2126-1GB0 supplied by Razz Middle East is a genuine Siemens product, manufactured under ISO 9001 quality management and conforming to the relevant IEC 60947 standards with international CE and UL approvals. Sourcing through an authorized channel guarantees correct datecodes, factory documentation and full warranty cover — a critical safeguard on safety-related motor control and protection equipment, where counterfeit components present a real risk to plant and personnel. For ARAMCO, SABIC, MAADEN, NWC and NEOM contractors operating under strict approved-vendor and traceability regimes, this assurance shortens technical and commercial evaluation and keeps projects on schedule. Razz Middle East backs each delivery with selection support, cross-referencing from competitor part numbers and documented lead times.
Why Choose Razz Middle East for Siemens Products
Razz Middle East supplies the genuine, factory-sealed Siemens 3RU2126-1GB0 as an authorized channel for Siemens industrial control products in the Kingdom of Saudi Arabia. Every overload relay ships with full manufacturer documentation and traceability, protecting your facility from counterfeit risk on safety-critical equipment. Our technical desk responds to RFQs within four working hours, and we hold local stock in Dammam and Riyadh with onward delivery to Dammam, Jubail, Riyadh, Jeddah and Yanbu. Whether you are sourcing a single replacement for an unplanned shutdown or standardising a complete motor control centre, our team supports selection, cross-referencing and lead-time planning for ARAMCO, SABIC, MAADEN, SWCC/NWC and NEOM contractors across the Kingdom.
Technical Specifications
Full specifications for the 3RU2126-1GB0
- Setting Range
- 4.5 - 6.3 A
- Trip Class
- 10
- Phases
- 3
- Phase-Loss Protection
- Yes (differential)
- Auxiliary Contacts
- 1 NO + 1 NC
- Reset
- Manual / Automatic
- Frame Size
- S0
- Mounting
- Direct-mount on 3RT2023-2028 contactors / stand-alone
- Enclosure
- IP20
- Ambient Temperature
- -25 °C to +60 °C
- Conformity
- IEC 60947-4-1
- Certifications
- CE, UL
ELECTRICAL
MECHANICAL
ENVIRONMENTAL & STANDARDS
Key Features & Benefits
- Adjustable thermal setting range of 4.5 - 6.3 A with temperature-compensated bimetals lets one device protect a band of motor full-load currents, cutting spares inventory at Saudi maintenance stores. Razz Middle East holds genuine stock in Dammam and Riyadh for fast Kingdom-wide despatch.
- Differential phase-loss (single-phasing) detection trips rapidly on a lost phase, preventing the winding burnouts that commonly follow supply faults on the Kingdom's long rural distribution feeders. Supporting the reliability standards demanded by Saudi oil, gas, water and petrochemical operators.
- Direct-mount S0 design clips onto companion 3RT2023-2028 contactors to form a self-contained starter with no inter-device wiring, speeding MCC assembly in Dammam and Riyadh panel shops. A specification advantage that EPC contractors value on Vision 2030 industrial and infrastructure projects.
- Selectable manual or automatic reset plus integrated NO + NC auxiliary contacts give flexible signalling and control wiring for both local panels and PLC-supervised motor control systems. Helping maintenance teams across the Eastern Province minimise unplanned downtime on critical drives.
- Trip class 10 characteristic matched to normal-starting motors, with a built-in test function supporting routine commissioning and preventive-maintenance checks on critical drives. And simplifying spares standardisation across large multi-site Siemens installations in Saudi Arabia.
- Certified to IEC 60947-4-1 with CE and UL approvals and rated -25 °C to +60 °C, meeting EPC specification requirements on ARAMCO, SABIC and NEOM motor protection schemes. Razz Middle East holds genuine stock in Dammam and Riyadh for fast Kingdom-wide despatch.
Industrial Applications in Saudi Arabia
- Thermal protection of pump motors at NWC and SWCC water and desalination plants, where the 3RU2126-1GB0's phase-loss sensitivity guards costly submersible and booster pump windings across Jubail, Yanbu and the Eastern Province.
- Motor branch-circuit protection inside SABIC, Sadara and Sipchem petrochemical motor control centres, where the direct-mount S0 design enables compact, standardised starter buckets. Backed by local stock in Dammam and Riyadh and KSA-wide delivery to every industrial zone.
- Conveyor, fan and crusher motor protection at MAADEN mining and Saudi cement operations, where adjustable trip settings accommodate varied motor sizes on a common spares platform. Where reliable, type-tested Siemens equipment underpins plant availability and personnel safety.
- Utility and auxiliary motor protection in ARAMCO gas plants and refineries, where reliable overload and single-phasing detection underpins plant availability and personnel safety. Supported by Razz Middle East's technical selection and cross-referencing service for Saudi customers.
- Retrofit and replacement of ageing overload relays in existing Siemens starters Kingdom-wide, supplied as genuine factory-sealed units by Razz Middle East with four-hour RFQ response. Meeting the approved-vendor and traceability requirements of the Kingdom's major operators.
Industrial Supplier in Saudi Arabia
Get a Quote for the Siemens 3RU2126-1GB0 SIRIUS Thermal Overload Relay 4.5 - 6.3 A, Class 10
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Frequently Asked Questions — 3RU2126-1GB0
Common questions from buyers in Saudi Arabia and the GCC
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