SIEMENS
SIEMENS 3UB81234EW2 Overload Relay 10-40A 690V AC 3 Pole
Thermal overload relay protects motors from 10 A to 40 A at up to 690 V AC with selectable trip classes 5, 10, 20 or 30 and direct contactor mounting
- Adjustable protection from 10 A to 40 A
- Four selectable trip classes 5 10 20 30
- Rated for 690 V AC three-phase circuits
- Direct contactor mounting with screw terminals
- Automatic and manual reset options included
Industrial Motor Protection Relay
The SIEMENS 3UB81234EW2 overload relay protects three-phase motors by monitoring current between 10 A and 40 A at up to 690 V AC. It mounts directly to compatible contactors and provides one normally open and one normally closed auxiliary contact for control circuits.
Adjustable Trip Classes For Sustained Operation
Four selectable trip classes — 5, 10, 20 and 30 — let the installer match the relay response to the motor starting profile and continuous duty cycle. This flexibility helps prevent nuisance tripping during long acceleration or frequent start-stop sequences without sacrificing overload protection.
Screw Terminals And Direct Contactor Mounting
The unit uses screw terminals for secure wiring and attaches straight to the contactor, keeping the installation compact and reducing panel wiring. Auto and manual reset modes are both available so the operator can choose the recovery method that suits the application.
Highlights
- Adjustable protection from 10 A to 40 A
- Four selectable trip classes 5 10 20 30
- Rated for 690 V AC three-phase circuits
- Direct contactor mounting with screw terminals
- Automatic and manual reset options included
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How much heat does the 3UB81234EW2 generate when running at 40 A all day?
The relay uses screw-terminal connections rated for 690 V AC, so power dissipation at 40 A stays within the design limits of the 10–40 A adjustment range and Trip Class 5/10/20/30.
What contactor must I already own to mount the 3UB81234EW2 directly?
It mounts directly to SIEMENS Class 14 starters and Class 48 overload relay frames using the built-in direct-to-contactor mounting style.
Will the 3UB81234EW2 protect a legacy motor starter wired for 10 A minimum trip?
Yes, the minimum overload current setting is 10 A and the 1NO/1NC auxiliary contacts match traditional control circuits used with older starters.
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