Control Supply and Connection
The 3UG3051-1AL20: The relay operates on an AC control supply voltage of 196 to 253 V at both 50 Hz and 60 Hz. Connection is via screw-type terminals; mounting can be screw-fixed or snapped onto a DIN rail.
Siemens SIRIUS 3UG3051-1AL20 Underspeed Monitoring Relay, 45
MPN3UG3051-1AL20
Siemens SIRIUS 3UG3051-1AL20, discontinued underspeed monitoring relay, 45 mm, AC 230 V 50/60 Hz, 1 CO contact, screw connection.
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Product line / brand name | SIRIUS |
| Parameter | Value |
|---|---|
| Rated value (50 Hz) | 196 ... 253 V |
| Rated value (60 Hz) | 196 ... 253 V |
| Parameter | Value |
|---|---|
| Electrical connection type | screw-type terminals |
| Parameter | Value |
|---|---|
| Fastening method | screw and snap-on mounting |
| Width | 45 mm |
| Height | 100 mm |
| Depth | 100 mm |
Product details
Frequently asked questions
What is the official replacement for the 3UG3051-1AL20?
The official Siemens replacement order code is 3UG4651-1AW30.
What are the key ratings of the 3UG3051-1AL20?
It monitors underspeed from 0.1 to 600 1/min across four ranges, with a repeat accuracy of 1 % and metering precision of 10 %. Control supply is AC 196–253 V at 50/60 Hz. The relay has one CO contact and screw terminals.
MPN
3UG3051-1AL20