The 3UG3531-1AC20: The 0.2 to 60 V AC/DC measuring range covers low-voltage signal monitoring — think undervoltage or overvoltage on control transformers, sensor supplies, or battery-backed DC buses. The single-pole main circuit (1 pole) and 1CO output mean it switches one isolated signal path; it is not for direct motor load switching. The 22.5 mm width and snap-on DIN mount let it slot into a standard terminal-block row without extra brackets.
Siemens 3UG3531-1AC20 SIRIUS Monitoring Relay, Discontinued
MPN3UG3531-1AC20
Siemens SIRIUS 3UG3531-1AC20 monitoring relay, 22.5 mm, measuring voltage 0.2...60 V AC/DC, threshold value + hysteresis, 1CO, 24 V AC 50/60 Hz, screw terminal, snap-on mounting, IP20.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Product line / brand name | SIRIUS |
| Parameter | Value |
|---|---|
| Ingress protection (IP rating), wired | IP20 |
| Parameter | Value |
|---|---|
| Mounting type | snap-on mounting |
| Parameter | Value |
|---|---|
| Reference code acc. to DIN EN 61346-2 | K |
| Reference code acc. to DIN EN 81346-2 | K |
| Number of poles for main current circuit | 1 |
Product details
Frequently asked questions
What is the official replacement for the 3UG3531-1AC20?
Siemens lists the 3UG4631-1AA30 as the direct replacement type.
What is the mounting method for this relay?
It uses snap-on mounting onto a 35 mm DIN rail per EN 60715.
What is the IP protection rating?
IP20 at the terminals, suitable for enclosed control panels.
MPN
3UG3531-1AC20