The Siemens 3RU2116-1DB00-8K is a compact and reliable thermal overload relay from the proven SIRIUS 3RU2 Series, engineered to provide dependable protection for three-phase AC motors against overload conditions, phase failure, and excessive temperature rise. With an adjustable current setting range of 2.2–3.2 A, Class 10 tripping characteristic, and compatibility with Size S00 Siemens contactors, this relay is ideal for industrial motor starters, automation systems, control panels, and OEM equipment. Siemens 3RU2 relays are designed specifically for current-dependent motor protection and inverse-time delayed tripping.
The relay continuously monitors motor current and disconnects the motor when overload conditions persist beyond safe operating limits. Its inverse-time thermal tripping mechanism helps prevent motor winding damage, insulation deterioration, and unplanned downtime while allowing normal starting currents. Integrated phase-failure sensitivity provides additional protection against motor damage caused by phase loss or imbalance.
The Variant DB008K features an adjustable overload release range of 2.2–3.2 A, making it suitable for protecting small three-phase motors used in pumps, fans, compressors, conveyors, HVAC equipment, packaging machinery, and industrial automation applications. The compact S00 frame size allows efficient installation in motor control centers (MCCs), industrial switchboards, and control cabinets.
Designed for direct mounting on compatible Siemens contactors, the relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling and control integration. It supports both manual and automatic reset modes and utilizes screw-type terminals for secure and reliable wiring connections. The relay is suitable for applications up to 690 V AC.
Manufactured to Siemens' stringent quality standards, the 3RU2116-1DB00-8K delivers long service life, dependable performance, and effective motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1DB00-8K |
| SKU | 3RU2116-1DB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB008K |
| 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 | Up to 690 V AC |
| Operating Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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