SIEMENS
SIEMENS 3UB81134BB2 Overload Relay 0.75-3.4A 690V AC
Protects motors from 0.75 to 3.4 A at 690 V AC with selectable trip classes and direct contactor mounting
- Adjustable 0.75–3.4 A range protects varied motor loads
- Selectable trip classes 10, 20, 30 match application needs
- 690 V AC rating suits industrial power systems
- Direct contactor mounting with screw terminals speeds installation
- 1 NO / 1 NC auxiliary contacts give flexible control signaling
Overload Relay for Motor Protection
The SIEMENS 3UB81134BB2 overload relay protects three-phase motors from excessive current. It covers a setting range from 0.75 A to 3.4 A at up to 690 V AC. The unit suits industrial control panels using Class 14 starters or Class 48 overload relays.
Direct Mounting with Screw Terminals
The relay mounts directly onto a compatible contactor and uses screw terminals for wiring. Trip class is selectable among 10, 20 and 30. Auto and manual reset modes are both available. No separate thermal units are required.
Check Contactor Compatibility and Wiring Space
Verify that your contactor belongs to the compatible series before ordering. Confirm that the panel layout allows direct mounting and that screw-terminal wiring fits the available space. Ensure the motor full-load current falls within the 0.75 A to 3.4 A range.
Highlights
- Adjustable 0.75–3.4 A range protects varied motor loads
- Selectable trip classes 10, 20, 30 match application needs
- 690 V AC rating suits industrial power systems
- Direct contactor mounting with screw terminals speeds installation
- 1 NO / 1 NC auxiliary contacts give flexible control signaling
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How do I verify the 3UB81134BB2 overload relay is working after wiring it to a Class 14 starter?
Apply load current within the 0.75 A to 3.4 A range; the relay should trip according to the selected class 10, 14, 20 or 30 setting and the 1NO/1NC auxiliary contacts must change state to signal the trip.
What comes with the 3UB81134BB2 and what must I source separately?
The relay includes screw terminals for direct contactor mounting and selectable trip classes 10, 14, 20, 30; you must supply the Class 14 starter or Class 48 contactor, wiring and upstream protection.
Which trip class 10, 14, 20 or 30 should I select for the 3UB81134BB2?
Choose class 10 for fast motor protection, class 20 for standard starts, class 30 for heavy inertial loads; class 14 suits specific Siemens starter curves — match the class to your motor acceleration time.
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