SIEMENS
SIEMENS 3UB81334GW2 Overload Relay 25-100A 690V AC
Thermal overload relay protects three-phase motors from 25 A to 100 A at 690 V AC with selectable trip classes 10, 20 and 30
- Adjustable 25–100 A range protects diverse motor loads
- Four selectable trip classes 5/10/20/30 match application needs
- 690 V AC rating suits industrial three-phase systems
- Direct contactor mounting with screw terminals speeds installation
- Auto and manual reset options reduce downtime
SIEMENS 3UB81334GW2 Overload Relay
The SIEMENS 3UB81334GW2 is an overload relay designed for motor protection in industrial control panels. It suits maintenance engineers and panel builders who need adjustable current monitoring for three-phase circuits.
Adjustable range 25 A to 100 A at 690 V AC
The relay offers a minimum setting of 25 A and a maximum of 100 A with selectable trip classes 10, 14, 20 and 30. It handles standard motor loads within this window but cannot protect circuits that exceed the upper limit or require a lower floor.
Direct contactor mounting with screw terminals
Mounting is direct to compatible Class 14 starters and Class 48 overload relays using screw terminals for secure wiring. The 1NO/1NC auxiliary contacts support both auto and manual reset modes, simplifying integration into existing control schemes.
Highlights
- Adjustable 25–100 A range protects diverse motor loads
- Four selectable trip classes 5/10/20/30 match application needs
- 690 V AC rating suits industrial three-phase systems
- Direct contactor mounting with screw terminals speeds installation
- Auto and manual reset options reduce downtime
Specifications
| Brand | SIEMENS |
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Questions about this item
Will the 3UB81334GW2 mount directly to my existing Class 14 starter?
Yes, the relay uses a direct-to-contactor mounting style and is listed as compatible with Series Class 14 starters, so it fits without an adapter bracket.
How do I verify the overload relay is operating correctly after wiring the screw terminals?
Apply load current within the 25 A to 100 A range; the 1NO/1NC auxiliary contacts will change state on a trip, and the selectable Trip Class 5/10/20/30 determines the response time.
Does the box include thermal units or must they be purchased separately?
Thermal units are not applicable for this model, so nothing extra is required — the relay ships ready to install with its integrated trip mechanism.
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