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Siemens 3UG3501-1AC20 — Process / Temperature Controllers

Siemens 3UG3501-1AC20 Monitoring Relay, Level, 22.5mm, AC 24

MPN3UG3501-1AC20

Siemens SIRIUS 3UG3501-1AC20 level monitoring relay, 22.5 mm width, 1 CO contact, sensitivity 5...100 kOhm, AC 24V 50/60Hz, screw-type terminals.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3UG3501-1AC20 — Identification
ParameterValue
Product line / brand nameSIRIUS
3UG3501-1AC20 — Electrical
ParameterValue
Rated value (50 Hz)20.4 ... 26 V
Rated value (60 Hz)20.4 ... 26 V
3UG3501-1AC20 — Communication
ParameterValue
Electrical connection typescrew-type terminals
3UG3501-1AC20 — Mechanical
ParameterValue
Fastening methodscrew and snap-on mounting
Width22.5 mm
Height78 mm
Depth100 mm
Conductor cross-section, solid20 ... 14
Conductor cross-section, finely stranded (with ferrule)0.5 ... 2.5 mm²
3UG3501-1AC20 — Other specifications
ParameterValue
Stranded20 ... 14
At AWG cables solid2x (20 ... 14)
At AWG cables stranded2x (20 ... 14)
Adjustable responsivenessYes
Of the control supply voltageAC
Reference code acc. to IEC 81346-2K

Product details

The Siemens SIRIUS 3UG3501-1AC20 is a level monitoring relay in the 22.5 mm housing, with a single changeover contact and adjustable sensitivity from 5 to 100 kOhm. It accepts an AC control supply voltage of 20.4 to 26 V at both 50 Hz and 60 Hz, per the datasheet.

The relay measures 22.5 mm wide by 78 mm high by 100 mm deep, fitting standard DIN-rail enclosures. Fastening is via screw and snap-on mounting. Screw-type terminals accept solid or stranded wire from 20 to 14 AWG, and finely stranded wire with core end processing from 0.5 to 2.5 mm².

Frequently asked questions

What is the closest functional second-source for the 3UG3501-1AC20?

The official replacement type is the 3UG4501-1AW30. The 3UG4501-1AA30 can also be used if wired correctly. The Siemens SIRIUS 6ES7136-6AB00-0CA1 is a different product class (analog input module) and is not a functional substitute for this level monitoring relay.

What wire sizes does the 3UG3501-1AC20 accept?

Solid and stranded wire from 20 to 14 AWG, and finely stranded wire with core end processing from 0.5 to 2.5 mm².

MPN
3UG3501-1AC20