SIEMENS
SIEMENS 3UB81234DW2 Overload Relay 5.5-22A 690V AC
Protects three-phase motors from 5.5 A to 22 A at 690 V AC with selectable trip classes 5, 10, 20 or 30 and auto or manual reset
- Protects motors from 5.5 A up to 22 A
- Handles up to 690 V AC for industrial power systems
- Selectable trip classes 10, 20, 30 match load profiles
- Auto and manual reset options speed recovery after faults
- Direct contactor mounting with screw terminals simplifies installation
Industrial Overload Relay for Motor Protection
The SIEMENS 3UB81234DW2 overload relay protects three-phase motors by monitoring current between 5.5 A and 22 A at up to 690V AC. It mounts directly onto compatible contactors and provides one normally open and one normally closed auxiliary contact for control circuits. Adjustable trip classes of 10, 20 and 30 allow matching the response to the application.
Compatibility Checks Before Ordering
Verify that the contactor belongs to the Class 14 starter series or the Class 48 overload relay range. Confirm the control circuit can use screw-terminal connections and that the panel layout allows direct-to-contactor mounting. Ensure the motor full-load current falls within the 5.5 A to 22 A adjustment range.
Thermal Behaviour and Power Consumption
The relay uses built-in thermal elements that trip according to the selected class setting without external thermal units. In normal operation the device draws only the small control-circuit power needed to hold the auxiliary contacts. Auto and manual reset modes are both available so the operator can choose the restart method after a trip event.
Highlights
- Protects motors from 5.5 A up to 22 A
- Handles up to 690 V AC for industrial power systems
- Selectable trip classes 10, 20, 30 match load profiles
- Auto and manual reset options speed recovery after faults
- Direct contactor mounting with screw terminals simplifies installation
Specifications
| Brand | SIEMENS |
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Questions about this item
What comes in the box with the 3UB81234DW2 overload relay and what must be purchased separately?
The relay includes 1NO/1NC auxiliary contacts and screw terminals for direct contactor mounting; thermal units and the contactor itself are not included.
Which trip class setting — 5, 10, 20 or 30 — should I select for a motor that draws 5.5 A to 22 A?
Choose the trip class that matches the motor’s acceleration time; class 10 is common for general-purpose loads, while class 20 or 30 suits high-inertia starts.
How does the 690 V AC maximum voltage rating apply when the relay is wired into a three-phase starter?
The 690 V AC rating is the maximum line-to-line voltage the relay can safely monitor; it must not exceed the supply voltage of the starter circuit.
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