SIEMENS
SIEMENS 3UB81334FW2 Overload Relay 13-52 A 690 V AC
Three-pole overload relay protects motors from 13 to 52 amps at up to 690 volts AC with selectable trip classes 5, 10, 20 and 30
- Adjustable protection range from 13 A to 52 A
- Selectable trip class 5, 10, 20 or 30 for motor matching
- Rated for 690 V AC in three-phase systems
- Direct contactor mounting with screw terminals speeds installation
- Auto and manual reset options suit different maintenance routines
SIEMENS 3UB81334FW2 Overload Relay
The SIEMENS 3UB81334FW2 is a three-pole overload relay designed for motor protection in industrial control circuits. It mounts directly to compatible contactors and offers screw-terminal connections for straightforward installation. The unit operates at up to 690 V AC and includes both automatic and manual reset options.
Suits panels using Class 14 starters
This relay fits systems that require a 13 A to 52 A current setting range and selectable Trip Class 5, 10, 20 or 30. Builders needing a different current band, a NEMA-sized device or a relay without thermal units should look elsewhere. Applications demanding a voltage rating above 690 V AC are not supported.
Adjustable 13 A to 52 A trip range
The single specification that decides fit is the overload current setting window of 13 A minimum to 52 A maximum combined with Trip Class 5, 10, 20 and 30 selection. Match these values to the motor full-load current and required acceleration time to confirm compatibility.
Highlights
- Adjustable protection range from 13 A to 52 A
- Selectable trip class 5, 10, 20 or 30 for motor matching
- Rated for 690 V AC in three-phase systems
- Direct contactor mounting with screw terminals speeds installation
- Auto and manual reset options suit different maintenance routines
Specifications
| Brand | SIEMENS |
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Questions about this item
What contactor mounting style does the 3UB81334FW2 overload relay use?
The relay mounts directly to a compatible contactor without a separate base or rail.
Which terminal connection type and trip class settings are required during installation?
Wire the screw terminals and select the trip class — 5, 10, 20 or 30 — that matches the motor start profile; forgetting to set the class is the common error.
What auxiliary contact configuration is available for circuit monitoring or replacement?
The built-in auxiliary block provides one normally-open and one normally-closed contact (1NO/1NC) for status signalling.
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