The Siemens 3RU2116-1JB0 is a reliable thermal overload relay from the SIRIUS 3RU2 Series, engineered to protect three-phase motors against overload conditions, phase failure, and overheating. Designed for direct mounting on Siemens Size S00 contactors, the relay features an adjustable current setting range of 7–10 A, Class 10 tripping characteristics, and integrated auxiliary contacts, making it ideal for industrial motor control and automation applications.
Using Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and trips when overload conditions persist beyond safe operating limits. Its inverse-time delayed tripping characteristic helps prevent motor winding damage while allowing normal motor starting currents. Integrated phase-failure sensitivity further enhances motor protection and operational reliability.
The Variant JB0 provides an adjustable overload release range of 7–10 A, making it suitable for protecting motors used in pumps, fans, compressors, conveyors, HVAC systems, packaging machinery, and industrial automation equipment. Its compact S00 frame size enables efficient installation in control panels, motor control centers (MCCs), and OEM machinery.
The relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling and trip indication. It supports both manual and automatic reset modes and utilizes screw-type terminals for secure wiring and simplified installation. The relay is rated for applications up to 690 V AC and complies with Siemens SIRIUS motor protection standards.
Manufactured to Siemens' stringent quality standards, the 3RU2116-1JB0 delivers dependable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1JB0 |
| SKU | 3RU2116-1JB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | JB0 |
| Current Setting Range | 7–10 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 |
| Operating Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Rated Motor Power @ 400V AC-3 | 4 kW |
| Protection Features | Overload & Phase Failure Protection |
| Manufacturer | Siemens |
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