The Siemens 3RU2900-1B is a genuine SIRIUS accessory designed for use with 3RU2 thermal overload relays. Rather than being a standard mounting adapter, this model functions as a cable release with holder for RESET, allowing convenient remote mechanical reset of compatible thermal overload relays after a trip event. The assembly features a 400 mm cable length and is designed for overload relay sizes S00 and S0.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2900-1B enables operators to perform reset operations from a more accessible location, reducing the need to directly access the overload relay mounted inside control panels or motor starter assemblies. This helps improve maintenance efficiency and minimize downtime in industrial environments.
The cable release assembly is specifically designed for compatibility with Siemens 3RU2 thermal overload relays and integrates seamlessly into motor protection systems. By extending reset functionality outside the control enclosure, it supports safer and more convenient operation in applications where equipment accessibility is limited.
Manufactured according to Siemens quality standards, the 3RU2900-1B offers reliable long-term performance in industrial automation systems, motor control centers, process plants, conveyor systems, pump stations, compressors, and OEM machinery installations.
| Specification | Details |
|---|---|
| Product Name | Cable Release with Holder for Reset |
| Part Number | 3RU2900-1B |
| SKU | 3RU2900-1B |
| Brand | Siemens |
| Product Family | SIRIUS |
| Product Type | Thermal Overload Relay Accessory |
| Function | Remote Mechanical Reset |
| Compatible Series | Siemens 3RU2 Thermal Overload Relays |
| Relay Sizes | S00, S0 |
| Cable Length | 400 mm |
| Mounting Diameter | 6.5 mm |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -50°C to +80°C |
| Application | Motor Protection Systems |
| Industrial Use | Yes |
| Manufacturer | Siemens |
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