SIEMENS
High-performance thermal overload relay designed for current-dependent protection of loads with normal starting. Part of the renowned SIRIUS range, this Size S00 relay offers a setting range of 1.8 to 2.5 A, providing robust motor protection with manual/automatic reset capabilities and screw terminal connections.
Backorder available · Factory lead time 2–3 weeks.
The Siemens 3RU2116-1CB0 thermal overload relay is an essential motor protection component engineered to safeguard electric motors from overload conditions, overheating, and potential damage. As part of Siemens’ trusted motor protection portfolio, this relay delivers consistent performance in industrial and commercial environments where operational reliability is critical.
Designed in Size S00, the relay is compact yet powerful, making it ideal for control panels with limited space. It supports a current setting range of 1.8 to 2.5 amps, providing precise protection for small to medium-sized motors. The Class 10 tripping characteristic ensures fast and accurate response during overload situations, minimizing downtime and protecting connected equipment.
The relay is optimized for contactor mounting, allowing direct integration with Siemens contactors. Both main and auxiliary circuits use screw connections, ensuring secure wiring, easy installation, and long-term stability. With manual and automatic reset functionality, users can choose the reset mode that best suits their operational needs.
Enhanced Reliability: Provides dependable protection against single-phasing and overload conditions, significantly extending the lifespan of your motors.
Simplified Installation: Designed for direct mounting on contactors, reducing wiring time and potential points of failure.
Versatile Reset Options: Features a flexible Manual-Automatic-Reset selector switch, allowing operators to choose the best recovery method for their specific application.
Space-Saving Design: Part of the S00 frame size, it maximizes cabinet density without compromising on thermal performance.
Global Standards: Fully compliant with international standards, making it suitable for export-oriented machinery.
The 3RU2116-1CB0 is packed with technical features designed for the modern industrial environment:
Trip Class 10: Ensures a reliable trip time for standard motor starting applications, protecting the insulation of the motor windings.
Adjustable Current Settings: A dial allows for precise current setting between 1.8 A and 2.5 A.
Integrated Auxiliary Contacts: Equipped with 1 NO (Normally Open) and 1 NC (Normally Closed) contact for signaling trips and controlling the contactor coil.
Phase Failure Sensitivity: Optimized to detect imbalances in current, preventing motor burnout during phase loss.
Screw Terminals: Provides high-vibration resistance and secure electrical connections for both the main and auxiliary circuits.
The versatility of the Siemens 3RU2116-1CB0 makes it ideal for a wide range of industries:
Manufacturing: Ideal for conveyor belts, fans, and small pumps.
HVAC Systems: Used in air handling units and compressor motor protection.
Infrastructure: Reliable protection for water treatment pumps and ventilation systems.
Machinery OEM: A standard component for builders of small-scale industrial processing machines.
Product Number: Siemens 3RU2116-1CB0
Current Range: 1.8 – 2.5 A
Protection Type: Thermal overload protection
Tripping Class: Class 10
Size: S00
Mounting Type: Contactor mounting
Main Circuit Connection: Screw
Auxiliary Circuit Connection: Screw
Reset Type: Manual / Automatic
To ensure the longevity of the Siemens 3RU2116-1CB0, it is recommended to conduct periodic inspections of the screw terminal tightness, especially in environments prone to vibration. The built-in "Stop" button allows for functional testing of the trip mechanism without the need for high-current simulation, ensuring your safety systems are always ready to act.
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| SKU / Model | 3RU2116-1CB0 |
|---|---|
| Brand | SIEMENS |
| product brand name | SIRIUS |
| product designation | thermal overload relay |
| product type designation | 3RU2 |
| size of overload relay | S00 |
| size of contactor can be combined company-specific | S00 |
| power loss [W] for rated value of the current at AC in hot operating state | 5.7 W |
| ● per pole | 1.9 W |
| insulation voltage with degree of pollution 3 at AC rated value | 690 V |
| surge voltage resistance rated value | 6 kV |
| maximum permissible voltage for safe isolation in networks with grounded star point | - |
| ● between auxiliary and auxiliary circuit | 440 V |
| ● between main and auxiliary circuit | 440 V |
| shock resistance acc. to IEC 60068-2-27 | 8g / 11 ms |
| type of protection according to ATEX directive 2014/34/EU | Ex II (2) GD |
| certificate of suitability according to ATEX directive 2014/34/EU | DMT 98 ATEX G 001 |
| reference code acc. to IEC 81346-2 | F |
| installation altitude at height above sea level maximum | 2 000 m |
| ambient temperature | - |
| ● during operation | -40 ... +70 °C |
| ● during storage | -55 ... +80 °C |
| ● during transport | -55 ... +80 °C |
| temperature compensation | -40 ... +60 °C |
| relative humidity during operation | 10 ... 95 % |
| number of poles for main current circuit | 3 |
| adjustable current response value current of the current-dependent overload release | 1.8 ... 2.5 A |
| operating voltage | - |
| ● rated value | 690 V |
| ● at AC-3 rated value maximum | 690 V |
| operating frequency rated value | 50 ... 60 Hz |
| operational current rated value | 2.5 A |
| operating power at AC-3 | - |
| ● at 400 V rated value | 0.75 kW |
| ● at 500 V rated value | 1.1 kW |
| ● at 690 V rated value | 1.5 kW |
| design of the auxiliary switch | integrated |
| number of NC contacts for auxiliary contacts | 1 |
| number of NO contacts for auxiliary contacts | 1 |
| ● note | for message "Tripped" |
| number of CO contacts for auxiliary contacts | 0 |
| operational current of auxiliary contacts at AC-15 | - |
| ● at 120 V | 3 A |
| ● at 230 V | 2 A |
| ● at 400 V | 1 A |
| operational current of auxiliary contacts at DC-13 | - |
| ● at 24 V | 2 A |
| ● at 60 V | 0.3 A |
| ● at 110 V | 0.22 A |
| ● at 125 V | 0.22 A |
| ● at 220 V | 0.11 A |
| contact rating of auxiliary contacts according to UL | B600 / R300 |
| trip class | CLASS 10 |
| design of the overload release | thermal |
| full-load current (FLA) for 3-phase AC motor | - |
| ● at 480 V rated value | 2.5 A |
| ● at 600 V rated value | 2.5 A |
| design of the fuse link | - |
| ● for short-circuit protection of the auxiliary switch required | fuse gG: 6 A, quick: 10 A |
| mounting position | any |
| fastening method | Contactor mounting |
| product component removable terminal for auxiliary and control circuit | No |
| type of electrical connection | - |
| ● for main current circuit | screw-type terminals |
| ● for auxiliary and control circuit | screw-type terminals |
| arrangement of electrical connectors for main current circuit | Top and bottom |
| ● at AWG cables for main contacts | 2x (20 ... 16), 2x (18 ... 14), 2x 12 |
| type of connectable conductor cross-sections | - |
| ● for auxiliary contacts | - |
| — solid or stranded | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| — finely stranded with core end processing | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| ● at AWG cables for auxiliary contacts | 2x (20 ... 16), 2x (18 ... 14) |
| tightening torque | - |
| ● for main contacts with screw-type terminals | 0.8 ... 1.2 N·m |
| ● for auxiliary contacts with screw-type terminals | 0.8 ... 1.2 N·m |
| design of screwdriver shaft | Diameter 5 ... 6 mm |
| size of the screwdriver tip | Pozidriv PZ 2 |
| design of the thread of the connection screw | - |
| ● for main contacts | M3 |
| ● of the auxiliary and control contacts | M3 |
| failure rate [FIT] with low demand rate acc. to SN 31920 | 50 FIT |
| MTTF with high demand rate | 2 280 y |
| T1 value for proof test interval or service life acc. to IEC 61508 | 20 y |
| protection class IP on the front acc. to IEC 60529 | IP20 |
| touch protection on the front acc. to IEC 60529 | finger-safe, for vertical contact from the front |
| display version for switching status | Slide switch |
| Vibration and Shock | - |
| last modified: | 12/1/2021 |
| Weight | 0.160 kg |
| Dimensions | 49.00 × 102.00 × 84.00 mm |
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