The Siemens 3UG5533-2AL30 is an analog monitoring relay for voltage supervision, covering 20 to 275 V AC/DC on the measurement input. It operates from a separate supply of 24 to 240 V DC and AC (50-60 Hz), so the monitored circuit and the relay's own power are independent — useful when you need to watch a voltage that can't also power the relay coil. Both overshoot and undershoot conditions are detected, with independent ON-delay and tripping delay adjustable from 0.1 to 30 seconds. That range lets you ride through brief transients without nuisance trips while still catching sustained faults. The single changeover contact (SPDT) is rated for general-purpose switching; termination is via spring-loaded terminals, which speed wiring in panel builds compared to screw clamps.
Siemens 3UG5533-2AL30 Analog Monitoring Relay, 20-275 V AC/D
MPN3UG5533-2AL30
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Siemens 3UG55 series analog voltage monitoring relay, 20-275 V AC/DC, 24-240 V DC/AC supply, 1 changeover contact, spring-loaded terminals.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Product family | Voltage monitoring |
| Parameter | Value |
|---|---|
| RoHS compliance | Since: 01-06-23 |
| REACH Art. 33 (SVHC disclosure) | Lead CAS-No. 7439-92-1 > 0,1 % (w / w) |
| Parameter | Value |
|---|---|
| Group code | R711 |
| Product group | 5885 |
| Product class | A: Standard product which is a stock item could be returned within the returns guidelines/period. |
| Export control regulations | AL : N / ECCN : 9N9999 |
Product details
Frequently asked questions
What are the key voltage ratings for this relay?
The measurement input covers 20 to 275 V AC/DC for both overshoot and undershoot detection. The auxiliary supply is 24 to 240 V DC and AC (50-60 Hz), independent of the monitored circuit.
MPN
3UG5533-2AL30