The Siemens 3RU2126-1EB0 is a compact and reliable thermal overload relay from the SIRIUS 3RU2 Series, engineered for dependable protection of three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. Designed for direct mounting on Siemens Size S0 contactors, the relay features an adjustable current setting range of 2.2–3.2 A and a Class 10 tripping characteristic, making it ideal for industrial motor starter applications and automation systems. SIRIUS 3RU2 relays are specifically developed for current-dependent motor protection and contactor-mounted installations.
The relay uses Siemens' proven thermal overload protection principle with inverse-time delayed tripping. This helps prevent motor overheating, winding damage, and unexpected downtime while allowing normal motor starting currents to pass without nuisance tripping. Integrated phase-failure sensitivity provides additional protection against single-phasing conditions and improves operational reliability.
The Variant EB0 provides an adjustable overload release range of 2.2–3.2 A, making it suitable for protecting small motors used in pumps, fans, compressors, conveyors, HVAC equipment, packaging machines, and industrial automation systems. Its compact S0 frame size allows efficient installation within control panels, motor control centers, and OEM machinery. Similar S0-frame 3RU2 relays are designed for direct contactor mounting with screw-terminal connections and manual/automatic reset functionality.
The relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, trip indication, and control circuit integration. Both manual and automatic reset modes are supported, providing flexibility for a wide range of industrial applications.
Manufactured according to Siemens' stringent quality standards, the 3RU2126-1EB0 delivers long service life, reliable motor protection, and dependable performance in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-1EB0 |
| SKU | 3RU2126-1EB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB0 |
| Current Setting Range | 2.2–3.2 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | Up to 690 V AC |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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