The Siemens 3RU2116-0JB0 is a compact and highly reliable thermal overload relay from the trusted SIRIUS 3RU2 Series, designed to provide effective protection for three-phase motors against overload conditions, phase failure, and overheating. Featuring an adjustable current setting range of 0.7–1.0 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for protecting small motors used in industrial automation, machinery, HVAC systems, pumps, fans, and OEM equipment.
Built on Siemens' proven inverse-time thermal protection technology, the relay continuously monitors motor current and disconnects the motor when overload conditions exceed safe operating limits. This helps prevent motor winding damage, insulation deterioration, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity provides additional protection against motor damage caused by phase loss or imbalance.
The Variant JB0 provides an adjustable overload release setting of 0.7–1.0 A, making it suitable for protecting fractional horsepower and small three-phase motors used in conveyors, dosing systems, compact pumps, ventilation systems, packaging machinery, and process automation applications. Its compact S00 frame size enables efficient installation in motor control centers (MCCs), switchboards, 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 electrical connections and simplified installation. The relay is rated for applications up to 690 V AC.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-0JB0 delivers dependable long-term performance and reliable motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-0JB0 |
| SKU | 3RU2116-0JB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | JB0 |
| Current Setting Range | 0.7–1.0 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 Operational Voltage | Up to 690 V AC |
| Rated Motor Power @ 400V AC-3 | 0.25 kW |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Manufacturer | Siemens |
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