🔹 Siemens Thermal Overload Relay – 3UA58002TZ1 (3UA Series, Variant TZ1)
🔹 Product Description
The Siemens 3UA58002TZ1 is a thermal overload relay from the Siemens 3UA Series, designed for reliable protection of industrial motors against overload, phase failure, and overheating conditions. It ensures safe motor operation by disconnecting the circuit when current exceeds the preset safe limit for a sustained period.
This TZ1 variant belongs to the 3UA5800 frame range, typically used in medium-to-heavy duty motor starter systems. It is commonly mounted with Siemens contactors such as the 3TF series and used in industrial applications like pumps, compressors, conveyors, HVAC systems, and automation machinery.
The relay operates on a bimetal thermal mechanism, where motor current heats bimetal strips. When excessive current flows, the strips bend and trigger a precise trip action, opening the control circuit and protecting the motor from damage.
According to Siemens 3UA design principles, this type of relay provides inverse-time overload protection along with phase-loss sensitivity, making it suitable for continuous industrial duty operations.
🔹 Key Features
• Genuine Siemens 3UA Series thermal overload relay
• Model: 3UA58002TZ1
• TZ1 variant for contactor-mounted motor protection systems
• Bimetal thermal overload protection technology
• Protection against overload and phase failure
• Suitable for industrial motor starter panels
• Designed for medium-to-high current applications (3UA5800 frame class)
• Reliable inverse-time tripping characteristic
• High durability and long service life
• Compatible with Siemens 3TF contactor systems
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA58002TZ1 |
| Product Type | Thermal Overload Relay |
| Variant | TZ1 |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Mounting Type | Contactor Mounted |
| Current Range | ~40–57 A (typical for 3UA5800 TZ1 class variants) |
| Application | Motor Protection / Industrial Control Panels |
| Brand | Siemens |
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