The Siemens 3RU2116-1DB0 is a high-quality thermal overload relay from the trusted SIRIUS 3RU2 Series, engineered to provide reliable protection for three-phase motors against overload conditions, phase failure, and overheating. Featuring an adjustable current setting range of 2.2–3.2 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for industrial motor control systems, automation equipment, and compact motor starter assemblies.
Built on Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and disconnects the motor when overload conditions exceed safe operating limits. Its inverse-time delayed tripping characteristic helps prevent motor winding damage, insulation deterioration, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity further enhances motor protection and operational reliability.
The Variant DB0 provides an adjustable overload release setting of 2.2–3.2 A, making it suitable for protecting motors used in pumps, fans, compressors, conveyor systems, HVAC equipment, packaging machinery, machine tools, and industrial automation applications. Its compact S00 frame size enables efficient installation in motor control centers (MCCs), OEM machinery, and industrial control panels.
Designed for direct mounting on compatible Siemens contactors, the relay incorporates 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, monitoring, and control circuit integration. It supports both manual and automatic reset modes and features screw-type terminals for secure wiring and easy installation. Additional features include a switch position indicator and test function for simplified maintenance.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-1DB0 delivers dependable long-term performance and effective motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1DB0 |
| SKU | 3RU2116-1DB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB0 |
| Current Setting Range | 2.2–3.2 A |
| Relay Size | S00 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | 690 V AC |
| Operating Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Operating Temperature | -40°C to +70°C |
| IP Rating | IP20 |
| Manufacturer | Siemens |
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